OPA3695
OP
A3
695
OPA
3695
www.ti.com ............................................................................................................................................... SBOS355A – APRIL 2008 – REVISED SEPTEMBER 2008
Triple, Ultra-Wideband, Current-Feedback
OPERATIONAL AMPLIFIER with Disable
FEATURES
DESCRIPTION
1
•
•
•
•
•
•
•
•
•
•
•
2
900MHz BANDWIDTH, GAIN = +2V/V
450MHz BANDWIDTH, GAIN = +8V/V
WIDE OUTPUT VOLTAGE SWING: ±4V
ULTRA-HIGH SLEW RATE: 4300V/µs
3RD-ORDER INTERCEPT: > 35dBm (f < 40MHz)
LOW 1.8nV/√Hz VOLTAGE NOISE
±120mA OUTPUT CURRENT DRIVE
12.9mA/Ch SUPPLY CURRENT (±5V)
LOW 0.1mA/Ch DISABLE CURRENT
3.5V to 12V SINGLE-SUPPLY OPERATION
±1.75V to ±6V SPLIT-SUPPLY OPERATION
APPLICATIONS
•
•
•
•
•
•
The low 12.9mA/channel supply current is precisely
trimmed at +25°C. This trim, along with a low
temperature drift, gives low system power over
temperature. System power may be further reduced
using the Disable control pin. Leaving this pin open,
or holding it high, gives normal operation. If pulled
low, the OPA3695 supply current drops to
100µA/channel. This power-saving feature, along with
exceptional single +5V operation, makes the
OPA3695 a good fit for low-power applications that
require very high performance. The OPA3695 is
available in an SSOP-16 package.
BROADBAND VIDEO LINE DRIVERS
VERY WIDEBAND ADC DRIVERS
HIGH BANDWIDTH INSTRUMENTATION
AMPLIFIERS
HIGH-SPEED IMAGING
ACTIVE FILTERS
ARB WAVEFORM OUTPUT DRIVERS
MONITOR OUTPUT
604W
+5V
604W
R
G
B
OPA3695 RELATED PRODUCTS
75W
75W
A
ADC/
DECODER
+
75W
0.1mF
75W
604W
RED
75W
604W
INPUT
RED
75W
-
0.1mF
B
GREEN
GREEN
+
BLUE
75W
75W
The OPA3695 is a triple, very high bandwidth,
current-feedback op amp that combines an
exceptional 4300V/µs slew rate and a very high
900MHz bandwidth (G = +2V/V) to provide an
amplifier that is ideal for the most demanding video
applications. The device versatility is enhanced with a
low 1.8nV/√Hz input voltage noise and an output
stage that can swing within 1V from the supply rail to
deliver a high dynamic range signal, making it
well-suited for analog-to-digital converter (ADC)
front-ends or digital-to-analog converter (DAC) output
buffering. Optimized for high gain operation, the
OPA3695 is also well-suited for buffering surface
acoustic wave (SAW) filters in an intermediate
frequency (IF) system.
0.1mF
604W
SINGLES
DUALS
TRIPLES
OPA695
OPA2695
OPA3695
OPA691
OPA2691
OPA3691
OPA692
THS3202
OPA3692
OPA693
—
OPA3693
OPA694
OPA2694
—
BLUE
75W
604W
75W
-
TVP7002
C
+
-5V
75W
75W
OPA3695
Figure 1. Typical RGB Input/Output Buffer
Application
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated
OPA3695
SBOS355A – APRIL 2008 – REVISED SEPTEMBER 2008 ............................................................................................................................................... www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ORDERING INFORMATION (1)
PRODUCT
PACKAGE
PACKAGE
DESIGNATOR
OPA3695
SSOP-16
DBQ
(1)
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
–40°C to +85°C
OPA3695
ORDERING
NUMBER
TRANSPORT MEDIA,
QUANTITY
OPA3695IDBQ
Rails, 75
OPA3695IDBQR
Tape and Reel, 3000
For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
ABSOLUTE MAXIMUM RATINGS (1)
Over operating free-air temperature range (unless otherwise noted).
Power supply
Internal power dissipation
OPA3695
UNIT
±6.5
VDC
See Thermal Analysis
Differential input voltage
±1.2
Input common-mode voltage range
V
±VS
Storage temperature range: DBQ
–65 to +125
°C
Lead temperature (soldering, 10s)
+300
°C
Junction temperature (TJ)
+125
°C
Human body model (HBM)
1500
V
Charge device model (CDM)
1000
V
Machine model (MM)
100
V
ESD rating
(1)
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these and any other conditions beyond
those specified is not supported.
PARAMETER INFORMATION
SSOP-16
(TOP VIEW)
2
-IN A
1
16
DIS A
+IN A
2
15
+VS
DIS B
3
14
OUT A
-IN B
4
13
-VS
+IN B
5
12
OUT B
DIS C
6
11
+VS
-IN C
7
10
OUT C
+IN C
8
9
-VS
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Product Folder Link(s): OPA3695
OPA3695
www.ti.com ............................................................................................................................................... SBOS355A – APRIL 2008 – REVISED SEPTEMBER 2008
ELECTRICAL CHARACTERISTICS: VS = ±5V
Boldface limits are tested at +25°C.
At RF = 402Ω, RL = 100Ω, and G = +8, unless otherwise noted.
OPA3695
TYP
PARAMETER
MIN/MAX OVER TEMPERATURE
UNITS
MIN/
MAX
TEST
LEVEL (1)
1000
MHz
typ
C
900
MHz
typ
C
MHz
min
B
MHz
typ
C
MHz
min
B
dB
max
B
CONDITIONS
+25°C
G = +1, RF = 909Ω
G = +2, RF = 604Ω
G = +8, RF = 402Ω
450
G = +16, RF = 249Ω
340
+25°C (2)
0°C to
70°C (3)
–40°C to
+85°C (3)
AC PERFORMANCE (see Figure 1)
Small-signal bandwidth (VO = 0.5VPP)
Bandwidth for 0.2dB gain flatness
400
G = +2, VO = 0.5VPP, RF = 604Ω
320
Peaking at a gain of +1
RF = 523Ω, VO = 0.5VPP
4.6
Large-signal bandwidth
G = +2, VO = 2VPP
600
MHz
typ
C
5.4
G = +8, VO = 4VPP
450
MHz
typ
C
G = +2, VO = 2V step
2400
V/µs
typ
C
G = –8, VO = 4V step
4300
3700
V/µs
min
B
G = +8, VO = 4V step
2900
2600
V/µs
min
B
G = +2, VO = 4V step
1.0
ns
typ
C
G = +8, VO = 0.5V step
0.8
ns
typ
C
G = +8, VO = 4V step
1.0
ns
typ
C
Settling time to 0.02%
G = +8, VO = 2V step
16
ns
typ
C
Settling time to 0.1%
G = +8, VO = 2V step
10
ns
typ
C
Slew rate
Rise-and-fall time
Harmonic distortion
G = +8, f = 10MHz, VO = 2VPP
2nd harmonic
RL = 100Ω
–65
–62
dBc
max
B
RL ≥ 500Ω
–78
–76
dBc
max
B
RL = 100Ω
–86
–84
dBc
max
B
RL ≥ 500Ω
–86
–82
dBc
max
B
2nd harmonic
G = +2, f = 10MHz, RL = 100Ω
–74
dBc
typ
C
3rd harmonic
3rd harmonic
G = +2, f = 10MHz, RL = 100Ω
–74
dBc
typ
C
Input voltage noise
f > 1MHz
1.8
2
nV/√Hz
max
B
Noninverting input current noise
f > 1MHz
18
19
pA/√Hz
max
B
Inverting input current noise
f > 1MHz
22
24
pA/√Hz
max
B
Differential gain
G = +2, NTSC, VO = 1.4VPP,
RL = 150Ω
0.04
%
typ
C
Differential phase
G = +2, NTSC, VO = 1.4VPP,
RL = 150Ω
0.007
degrees
typ
C
All hostile, G = +8, f = 10MHz,
VO = 2VPP
–55
dB
typ
C
Crosstalk
DC PERFORMANCE (4)
Open-loop transimpedance gain (ZOL)
VO = 0V, RL = 100Ω
85
45
43
41
kΩ
min
A
Input offset voltage
VCM = 0V
±0.3
±3.5
±4.0
±4.5
mV
max
A
Average offset voltage drift
VCM = 0V
±10
±15
µV/°C
max
B
Noninverting input bias current
VCM = 0V
±37
±41
µA
max
A
Average noninverting input bias current drift
VCM = 0V
150
180
nA/°C
max
B
Inverting input bias current
VCM = 0V
±66
±70
µA
max
A
Average inverting input bias current drift
VCM = 0V
±120
±160
nA/°C
max
B
A
+13
±20
±30
±60
INPUT
Common-mode input voltage range (CMIR) (5)
Common-mode rejection ratio (CMRR)
VCM = 0V
Noninverting input impedance
Inverting input resistance (RI)
(1)
(2)
(3)
(4)
(5)
Open-loop
±3.3
±3.1
±3.0
±3.0
V
min
56
51
50
50
dB
min
A
280 || 1.2
kΩ || pF
typ
C
33
Ω
typ
C
Test levels: (A) 100% tested at +25°C. Over temperature limits set by characterization and simulation. (B) Limits set by characterization
and simulation. (C) Typical value only for information.
Junction temperature = ambient for +25°C specifications.
Junction temperature = ambient at low temperature limits; junction temperature = ambient +48°C at high temperature limit for over
temperature specifications.
Current is considered positive out of pin.
Tested < 3dB below minimum specified CMRR at ±CMIR limits.
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OPA3695
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ELECTRICAL CHARACTERISTICS: VS = ±5V (continued)
Boldface limits are tested at +25°C.
At RF = 402Ω, RL = 100Ω, and G = +8, unless otherwise noted.
OPA3695
TYP
PARAMETER
MIN/MAX OVER TEMPERATURE
CONDITIONS
+25°C
+25°C (2)
0°C to
70°C (3)
–40°C to
+85°C (3)
UNITS
MIN/
MAX
TEST
LEVEL (1)
OUTPUT
Voltage output swing
No load
±4.0
±3.9
±3.8
±3.8
V
min
A
100Ω load
±3.9
±3.7
±3.7
±3.6
V
min
A
Current output, sourcing
VO = 0V
+120
+90
+80
+70
mA
min
A
Current output, sinking
VO = 0V
–120
–90
–80
–70
mA
min
A
G = +2, f = 10MHz
0.3
Ω
typ
C
Per channel, VDIS = 0V
–100
µA
max
A
VIN = ±0.25VDC
1
µs
typ
C
Enable time
VIN = ±0.25VDC
25
ns
typ
C
Off isolation
G = +8, 10MHz
77
dB
typ
C
4
pF
typ
C
Closed-loop output impedance
DISABLE (Disabled LOW)
Power-down supply current (+VS)
Disable time
Output capacitance in disable
–170
–187
–194
Turn-on glitch
G = +2, RL = 150Ω, VIN = 0V
±100
mV
typ
C
Turn-off glitch
G = +2, RL = 150Ω, VIN = 0V
±20
mV
typ
C
Enable voltage
3.3
3.5
3.6
3.7
V
min
A
Disable voltage
1.8
1.7
1.6
1.5
V
max
A
75
130
143
150
µA
max
A
V
typ
C
V
max
A
Control pin input bias current (DIS)
VDIS = 0V
POWER SUPPLY
Specified operating voltage
±5
Maximum operating voltage range
±6
Minimum operating voltage range
±1.75
±1.8
±1.9
V
min
B
Maximum quiescent current
Per channel, VS = ±5V
12.9
13.4
13.8
14.2
mA
max
A
Minimum quiescent current
Per channel, VS = ±5V
12.9
12.1
11.4
10.6
mA
min
A
Input-referred
55
51
48
48
dB
min
A
–40 to +85
°C
typ
C
80
°C/W
typ
C
Power-supply rejection ratio (–PSRR)
TEMPERATURE RANGE
Specification: IDBQ
Thermal resistance, θJA
DBQ
4
SSOP-16
Junction-to-ambient
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Product Folder Link(s): OPA3695
OPA3695
www.ti.com ............................................................................................................................................... SBOS355A – APRIL 2008 – REVISED SEPTEMBER 2008
ELECTRICAL CHARACTERISTICS: VS = +5V
Boldface limits are tested at +25°C.
At RF = 348Ω, RL = 100Ω to 2.5V, and G = +8, unless otherwise noted.
OPA3695
TYP
PARAMETER
MIN/MAX OVER TEMPERATURE
UNITS
MIN/
MAX
TEST
LEVEL (1)
850
MHz
typ
C
725
MHz
typ
C
MHz
typ
B
MHz
typ
C
B
CONDITIONS
+25°C
G = +1, RF = 750Ω
G = +2, RF = 487Ω
G = +8, RF = 348Ω
395
G = +16, RF = 162Ω
275
+25°C (2)
0°C to
70°C (3)
–40°C to
+85°C (3)
AC PERFORMANCE (see Figure 3)
Small-signal bandwidth (VO = 0.5VPP)
Bandwidth for 0.2dB gain flatness
380
G = +2, VO < 0.5VPP, RF = 487Ω
230
180
MHz
min
Peaking at a gain of +1
RF = 511Ω, VO < 0.5VPP
1.0
2.0
dB
max
B
Large-signal bandwidth
G = +2, VO = 2VPP
440
MHz
typ
C
G = +8, VO = 2VPP
330
MHz
typ
C
G = +2, VO = 2V step
1700
V/µs
typ
C
G = +8, VO = 2V step
1700
V/µs
min
B
G = +2, VO = 2V step
1.0
ns
typ
C
G = +8, VO = 0.5V step
1.0
ns
typ
C
G = +8, VO = 2V step
1.0
ns
typ
C
Settling time to 0.02%
G = +8, VO = 2V step
16
ns
typ
C
Settling time to 0.1%
G = +8, VO = 2V step
10
ns
typ
C
Slew rate
Rise-and-fall time
Harmonic distortion
1300
G = +8, f = 10MHz, VO = 2VPP
2nd harmonic
RL = 100Ω to 2.5V
–62
–58
dBc
max
B
RL ≥ 500Ω to 2.5V
–70
–66
dBc
max
B
RL = 100Ω to 2.5V
–66
–64
dBc
max
B
RL ≥ 500Ω to 2.5V
–65
–63
dBc
max
B
2nd harmonic
G = +2, f = 10MHz, RL = 100Ω
–68
dBc
typ
C
3rd harmonic
3rd harmonic
G = +2, f = 10MHz, RL = 100Ω
–68
dBc
typ
C
Input voltage noise
f > 1MHz
1.8
2
nV/√Hz
max
B
Noninverting input current noise
f > 1MHz
18
19
pA/√Hz
max
B
Inverting input current noise
f > 1MHz
22
24
pA/√Hz
max
B
DC PERFORMANCE (4)
Open-loop transimpedance gain (ZOL)
VO = 2.5V, RL = 100Ω to 2.5V
70
40
38
36
kΩ
min
A
Input offset voltage
VCM = 2.5V
±0.3
±3.5
±4.0
±4.5
mV
max
A
Average offset voltage drift
VCM = 2.5V
±10
±15
µV/°C
max
B
Noninverting input bias current
VCM = 2.5V
±45
±50
µA
max
A
Average noninverting input bias current drift
VCM = 2.5V
±110
±170
nA/°C
max
B
Inverting input bias current
VCM = 2.5V
±70
±75
µA
max
A
Average inverting input bias current drift
VCM = 2.5V
±120
±160
nA/°C
max
B
±5
±5
±40
±60
INPUT
Least positive input voltage (5)
1.7
1.8
1.9
1.9
V
max
A
Most positive input voltage (5)
3.3
3.2
3.1
3.1
V
min
A
54
51
50
50
dB
min
A
280 || 1.2
kΩ || pF
typ
C
37
Ω
typ
C
Common-mode rejection ratio (CMRR)
VCM = 2.5V
Noninverting input impedance
Inverting input resistance (RI)
(1)
(2)
(3)
(4)
(5)
Open-loop
Test levels: (A) 100% tested at +25°C. Over temperature limits set by characterization and simulation. (B) Limits set by characterization
and simulation. (C) Typical value only for information.
Junction temperature = ambient for +25°C specifications.
Junction temperature = ambient at low temperature limits; junction temperature = ambient +21°C at high temperature limit for over
temperature specifications.
Current is considered positive out of pin.
Tested < 3dB below minimum specified CMRR at ±CMIR limits.
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OPA3695
SBOS355A – APRIL 2008 – REVISED SEPTEMBER 2008 ............................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS: VS = +5V (continued)
Boldface limits are tested at +25°C.
At RF = 348Ω, RL = 100Ω to 2.5V, and G = +8, unless otherwise noted.
OPA3695
TYP
PARAMETER
MIN/MAX OVER TEMPERATURE
CONDITIONS
+25°C
+25°C (2)
0°C to
70°C (3)
–40°C to
+85°C (3)
UNITS
MIN/
MAX
TEST
LEVEL (1)
OUTPUT
Most positive output voltage
No load
4.2
4.0
3.9
3.8
V
min
A
RL = 100Ω load to 2.5V
4.0
3.9
3.8
3.7
V
min
A
No load
0.9
1.0
1.1
1.2
V
max
A
RL = 100Ω load to 2.5V
1.0
1.1
1.2
1.3
V
max
A
Current output, sourcing
VO = 2.5V
+90
+70
+67
+66
mA
min
A
Current output, sinking
VO = 2.5V
–90
–70
–67
–66
mA
min
A
G = +2, f = 100kHz
0.05
Ω
typ
C
Per channel, VDIS = 0V
–100
Least positive output voltage
Closed-loop output impedance
DISABLE (Disabled LOW)
µA
max
C
Disable time
1
µs
typ
C
Enable time
25
ns
typ
C
70
dB
typ
C
4
pF
typ
C
Power-down supply current (+VS)
Off isolation
G = +8, 10MHz
Output capacitance in disable
–160
–177
–180
Turn-on glitch
G = +2, RL = 150Ω, VIN = 2.5V
±100
mV
typ
C
Turn-off glitch
G = +2, RL = 150Ω, VIN = 2.5V
±20
mV
typ
C
A
Enable voltage
3.3
3.5
3.6
3.7
V
min
Disable voltage
1.8
1.7
1.6
1.5
V
max
A
75
130
143
149
µA
max
C
V
typ
C
V
max
A
Control pin input bias current (DIS)
VDIS = 0V
POWER SUPPLY
Specified single-supply operating voltage
5
Maximum single-supply operating voltage range
12
Minimum operating voltage range
3.5
3.6
3.8
V
min
B
A
Maximum quiescent current
Per channel, VS = +5V
11.4
12.1
12.6
13.0
mA
max
Minimum quiescent current
Per channel, VS = +5V
11.4
10.6
9.1
8.8
mA
min
A
Input-referred
56
dB
typ
C
–40 to +85
°C
typ
C
80
°C/W
typ
C
Power-supply rejection ratio (–PSRR)
TEMPERATURE RANGE
Specification: IDBQ
Thermal resistance, θJA
DBQ
6
SSOP-16
Junction-to-ambient
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OPA3695
www.ti.com ............................................................................................................................................... SBOS355A – APRIL 2008 – REVISED SEPTEMBER 2008
TYPICAL CHARACTERISTICS: VS = ±5V
At RF = 402Ω, RL = 100Ω, and G = +8, unless otherwise noted.
NONINVERTING SMALL-SIGNAL FREQUENCY RESPONSE
5
VS = ±5V
VO = 0.5VPP
RLOAD = 100W
Normalized Gain (dB)
3
2
VO = 1VPP
1
G = +2, RF = 511W
2
Normalized Gain (dB)
4
GAIN OF +2, LARGE-SIGNAL FREQUENCY RESPONSE
G = +1, RF = 511W
1
0
-1
G = +4, RF = 511W
-2
-3
G = +8, RF = 402W
-4
-1
VO = 2VPP
-2
-3
G = +16, RF = 249W
-6
1M
10M
VO = 7VPP
-6
100M
1G
2G
100M
1M
1G
Frequency (Hz)
Frequency (Hz)
Figure 2.
Figure 3.
GAIN OF +8, LARGE-SIGNAL FREQUENCY RESPONSE
NONINVERTING SMALL-SIGNAL PULSE RESPONSE
1
600
VO = 1VPP
Output Voltage (V)
-1
VO = 2VPP
-2
VO = 4VPP
VS = ±5V
G = +8V/V
RF = 402W
RLOAD = 100W
-3
VS = ±5V
G = +8V/V
RF = 402W
RLOAD = 100W
400
0
200
0
-200
-400
VO = 7VPP
-4
-600
100M
1M
1G
0
1
2
Frequency (Hz)
3
4
5
6
7
8
9
10
11
Time (ns)
Figure 4.
Figure 5.
NONINVERTING LARGE-SIGNAL PULSE RESPONSE
10MHz HARMONIC DISTORTION vs LOAD RESISTANCE
2.5
-60
VS = ±5V
G = +8V/V
RF = 402W
RLOAD = 100W
1.5
1.0
-65
Harmonic Distortion (dBc)
2.0
Output Voltage (V)
VO = 4VPP
VS = ±5V
G = +2V/V
RF = 511W
RLOAD = 100W
-4
-5
-5
Normalized Gain (dB)
0
0.5
0
-0.5
-1.0
-1.5
2nd Harmonic
-70
-75
-80
VS = ±5V
G = +8V/V
RF = 402W
VOUT = 2VPP
-85
-90
-2.0
3rd Harmonic
-95
-2.5
0
1
2
3
4
5
6
7
8
9
10
11
1
100
1k
Load Resistance (W)
Time (ns)
Figure 6.
Figure 7.
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TYPICAL CHARACTERISTICS: VS = ±5V (continued)
At RF = 402Ω, RL = 100Ω, and G = +8, unless otherwise noted.
10MHz HARMONIC DISTORTION vs SUPPLY VOLTAGE
HARMONIC DISTORTION vs FREQUENCY
-40
-65
Harmonic Distortion (dBc)
Harmonic Distortion (dBc)
-60
2nd Harmonic
-70
-75
3rd Harmonic
-80
G = +8V/V
RF = 402W
RLOAD = 100W
VOUT = 2VPP
-85
3.0
3.5
4.0
4.5
5.0
5.5
-60
-70
2nd Harmonic
-80
-90
3rd Harmonic
6.0
1M
10M
Frequency (Hz)
Figure 8.
Figure 9.
10MHz HARMONIC DISTORTION vs OUTPUT VOLTAGE
10MHz HARMONIC DISTORTION vs NONINVERTING GAIN
-60
-70
-75
2nd Harmonic
-80
-85
VS = ±5V
G = +8V/V
RF = 402W
RLOAD = 100W
-90
-95
3rd Harmonic
Harmonic Distortion (dBc)
-65
0.1
1
-65
2nd Harmonic
-70
-75
-80
3rd Harmonic
VS = ±5V
RLOAD = 100W
VOUT = 2VPP
-85
-90
-100
1
10
3
5
7
Figure 10.
13
15
10MHz HARMONIC DISTORTION vs SUPPLY VOLTAGE
-60
VS = ±5V
G = +2V/V
RF = 511W
VOUT = 2VPP
-70
-75
2nd Harmonic
-80
Harmonic Distortion (dBc)
Harmonic Distortion (dBc)
-65
11
Figure 11.
10MHz HARMONIC DISTORTION vs LOAD RESISTANCE
-60
9
Noninverting (V/V)
Output Voltage (VPP)
-65
2nd Harmonic
-70
-75
-80
-85
G = +2V/V
RF = 511W
RLOAD = 100W
VOUT = 2VPP
-85
3rd Harmonic
3rd Harmonic
-90
10
8
100M
Supply Voltage (±VS)
-60
Harmonic Distortion (dBc)
-50
-100
100k
-90
2.5
VS = ±5V
G = +8V/V
RF = 402W
RLOAD = 100W
VOUT = 2VPP
100
1k
2.5
3.0
3.5
4.0
4.5
Load Resistance (W)
Supply Voltage (±VS)
Figure 12.
Figure 13.
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5.5
6.0
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TYPICAL CHARACTERISTICS: VS = ±5V (continued)
At RF = 402Ω, RL = 100Ω, and G = +8, unless otherwise noted.
HARMONIC DISTORTION vs FREQUENCY
-60
10MHz HARMONIC DISTORTION vs OUTPUT VOLTAGE
-60
VS = ±5V
G = +2V/V
RF = 511W
RLOAD = 100W
VOUT = 2VPP
-65
Harmonic Distortion (dBc)
Harmonic Distortion (dBc)
-50
2nd Harmonic
-70
-80
-90
3rd Harmonic
-70
-75
-80
2nd Harmonic
-85
-90
-95
3rd Harmonic
-100
-100
100k
1M
10M
100M
0.1
1
Frequency (Hz)
Figure 15.
10MHz HARMONIC DISTORTION vs INVERTING GAIN
TWO-TONE, 3RD-ORDER INTERMODULATION INTERCEPT
-65
40
VS = ±5V
RLOAD = 100W
VOUT = 2VPP
2nd Harmonic
-70
-75
-80
3rd Harmonic
Output Intercept (+dBm)
Harmonic Distortion (dBc)
10
Output Voltage (VPP)
Figure 14.
-60
-85
VS = ±5V
RLOAD = 100W
VOUT = 2VPP
35
Inverting
Gain = -8V/V
RF = 442W
30
25
Noninverting
Gain = +8V/V
RF = 402W
20
15
-90
-1
-3
-5
-7
-9
-11
-13
40
20
-15
80
100 120 140 160 180 200 220 240
Frequency (MHz)
Figure 16.
Figure 17.
OUTPUT VOLTAGE AND CURRENT LIMITATIONS
DISABLE FEEDTHROUGH vs FREQUENCY
-40
1W Internal Power Boundary
Single-Channel
3
100W Load Line
2
50W Load Line
1
20W Load Line
0
-1
-2
1W Internal
Power Boundary
Single-Channel
-3
-4
-5
-250 -200 -150 -100 -50
0
50
IO (mA)
Disable Feedthrough (dB)
4
60
Inverting (V/V)
5
VO (V)
VS = ±5V
G = +2V/V
RF = 511W
RLOAD = 100W
-50
VS = ±5V
G = +8V/V
RF = 402W
RLOAD = 100W
Forward
-60
Reverse
-70
-80
-90
-100
100
150
200 250
1M
10M
100M
1G
Frequency (Hz)
Figure 18.
Figure 19.
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TYPICAL CHARACTERISTICS: VS = ±5V (continued)
At RF = 402Ω, RL = 100Ω, and G = +8, unless otherwise noted.
DIFFERENTIAL GAIN AND PHASE vs
NUMBER OF PARALLEL VIDEO LOADS
-20
VS = ±5V
G = +8V/V
RF = 402W
VOUT = 2VPP
RLOAD = 100W
All-Hostile Crosstalk
Crosstalk (dB)
-30
-40
Differential Gain/Differential Phase (%/°)
CROSSTALK vs FREQUENCY
Channel B
-50
Channel C
-60
Channel A
-70
-80
10M
1M
100M
0.02
VS = ±5V
G = +2V/V
RF = 511W
0.01
-0.01
-0.02
-dP
-0.04
+dG
-0.05
1G
1
2
3
Figure 21.
DISABLE/ENABLE RESPONSE
FREQUENCY RESPONSE vs CAPACITIVE LOAD
7
21
VS = ±5V
G = +8V/V
RF = 402W
VIN = 0.25VDC
RLOAD = 100W
Disable Pin Voltage
5
4
CL = 10pF
RS = 43.4W
18
Output (dB)
6
4
Number of Parallel Video Loads
Figure 20.
Voltage (V)
+dP
-0.03
Frequency (Hz)
3
Output Voltage
2
VS = ±5V
G = +8V/V
RF = 402W
RLOAD = 1kW
VOUT = 0.5VPP
CL = 22pF, RS = 30.3W
15
CL = 47pF, RS = 20.8W
12
1
0
CL = 100pF, RS = 14.9W
-1
0
10
-dG
0
1
2
3
4
5
6
7
8
9
10
9
10M
100M
Time (ms)
Frequency (Hz)
Figure 22.
Figure 23.
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TYPICAL CHARACTERISTICS: VS = +5V
At RF = 348Ω, RL = 100Ω to 2.5V, and G = +8, unless otherwise noted.
NONINVERTING SMALL-SIGNAL FREQUENCY RESPONSE
3
VS = 5V
VO = 0.5VPP
RLOAD = 100W
1
3.5
Output Voltage (V)
Normalized Gain (dB)
2
NONINVERTING LARGE-SIGNAL PULSE RESPONSE
4.0
G = +1V/V, RF = 487W
0
-1
G = +2V/V, RF = 487W
-2
G = +4V/V, RF = 453W
-3
3.0
2.5
2.0
VS = 5V
G = +8V/V
RF = 348W
RLOAD = 100W
-4
G = +8V/V, RF = 348W
1.5
-5
G = +16V/V, RF = 160W
-6
1M
100M
10M
1.0
1G
0
1
2
3
4
5
Frequency (Hz)
Figure 24.
Harmonic Distortion (dBc)
Harmonic Distortion (dBc)
-60
2nd Harmonic
-70
-80
3rd Harmonic
-90
100k
-40
-45
-50
-55
-60
-65
-70
-75
-80
-85
-90
-95
11
3rd Harmonic
-100
1M
10M
100M
0.1
1
Figure 27.
10MHz HARMONIC DISTORTION vs LOAD RESISTANCE
HARMONIC DISTORTION vs FREQUENCY
-40
Harmonic Distortion (dBc)
-55
-60
2nd Harmonic
-65
VS = 5V
G = +8V/V
RF = 348W
VOUT = 2VPP
10
Output Voltage (VPP)
-50
Harmonic Distortion (dBc)
10
VS = 5V
G = +8V/V
RF = 348W
RLOAD = 100W
Figure 26.
-75
9
2nd Harmonic
Frequency (Hz)
-70
8
10MHz HARMONIC DISTORTION vs OUTPUT VOLTAGE
VS = 5V
G = +8V/V
RF = 348W
RLOAD = 100W
VOUT = 2VPP
-50
7
Figure 25.
HARMONIC DISTORTION vs FREQUENCY
-40
6
Time (ns)
3rd Harmonic
-50
VS = 5V
G = +2V/V
RF = 487W
RLOAD = 100W
VOUT = 2VPP
-60
-70
2nd Harmonic
-80
3rd Harmonic
-80
-90
1
100
1k
0.1
1
10
Load Resistance (W)
Frequency (MHz)
Figure 28.
Figure 29.
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TYPICAL CHARACTERISTICS: VS = +5V (continued)
10MHz HARMONIC DISTORTION vs OUTPUT VOLTAGE
10MHz HARMONIC DISTORTION vs LOAD RESISTANCE
-40
-60
-50
Harmonic Distortion (dBc)
Harmonic Distortion (dBc)
At RF = 348Ω, RL = 100Ω to 2.5V, and G = +8, unless otherwise noted.
-60
-70
2nd Harmonic
-80
VS = 5V
G = +2V/V
RF = 487W
RLOAD = 100W
-90
3rd Harmonic
1
-65
3rd Harmonic
-70
2nd Harmonic
-75
-80
-100
0.1
VS = 5V
G = +2V/V
RF = 487W
VOUT = 2VPP
10
10
100
Figure 30.
Figure 31.
TWO-TONE, 3RD-ORDER INTERMODULATION INTERCEPT
RECOMMENDED RS vs CAPACITIVE LOAD
100
40
VS = 5V
RLOAD = 100W
VOUT = 2VPP
35
30
90
Series Resistance, RS (W)
Output Intercept (+dBm)
1k
Load Resistance (W)
Output Voltage (VPP)
Inverting
Gain = -8V/V
RF = 422W
25
Noninverting
Gain = +8V/V
RF = 348W
20
80
70
60
60
60
60
VS = ±5V or 5V
G = +8V/V
RF = 511W
60
60
15
0
20
40
60
80
100 120 140 160 180 200 220 240
1
10
100
Frequency (MHz)
Capacitive Load (pF)
Figure 32.
Figure 33.
1000
FREQUENCY RESPONSE vs CAPACITIVE LOAD
21
CL = 10pF
RS = 41.5W
Output (dB)
18
VS = 5V
G = +8V/V
RF = 348W
RLOAD = 1kW
VOUT = 0.5VPP
CL = 22pF, RS = 32W
15
CL = 47pF, RS = 21.3W
12
CL = 100pF, RS = 14.7W
9
10M
100M
1G
Frequency (Hz)
Figure 34.
12
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APPLICATION INFORMATION
WIDEBAND BUFFER OPERATION
The OPA3695 gives the exceptional ac performance
of a wideband current-feedback op amp with a highly
linear output stage. Requiring only 12.9mA/channel
supply current, the OPA3695 achieves a 900MHz
small-signal bandwidth (G = +2V/V); the high slew
rate capability of up to 4300V/µs supports a 600MHz
2VPP large signal into a 100Ω load. The low output
headroom of 1V from either supply in a very
high-speed amplifier gives very good single +5V
operation. The OPA3695 delivers a 2VPP swing with
greater than 400MHz bandwidth operating on a single
+5V supply. The primary advantage of a
current-feedback video buffer (as opposed to a
slew-enhanced, low-gain, stable voltage-feedback
implementation) is a higher slew rate with lower
quiescent power and output noise.
Figure 35 shows the dc-coupled, noninverting, dual
power-supply circuit configuration used as the basis
for the ±5V Electrical Characteristics table and
Typical Characteristics curves. For test purposes, the
input impedance is set to 50Ω with a resistor to
ground; the output impedance is set to 50Ω with a
series output resistor. Voltage swings reported in the
specifications are taken directly at the input and
output pins while load powers (dBm) are defined at a
matched 50Ω load. For the circuit of Figure 35, the
total effective amplifier loading is 100Ω || (RF + RG) .
For example, with a gain of +2V/V with RF and RG
equal to 604Ω, the equivalent amplifier loading is
100Ω || 1208Ω = 92.3Ω. The disable control line
(DIS) is typically left open to ensure normal amplifier
operation. Note that while most of the information
presented in this data sheet was characterized with
100Ω loading, performance with a standard video
loading of 150Ω has negligible impact on
performance. Any changes in performance are
typically improved over 100Ω loading because of
lower output current demands.
+5V
+
0.1mF
6.8mF
50W Source
DIS
VI
1/3
OPA3695
50W
50W
VO
50W Load
RF
RG
0.1mF
+
6.8mF
-5V
Figure 35. DC-Coupled, Noninverting,
Bipolar-Supply, Specification and Test Circuit
Figure 36 illustrates the dc-coupled, inverting
configuration used as the basis of the Inverting
Typical Characteristic curves. Inverting operation
offers several performance benefits. Since there is no
common-mode signal across the input stage, the slew
rate for inverting operation is higher and the distortion
performance is slightly improved. An additional input
resistor, RM, is included in Figure 36 to set the input
impedance equal to 50Ω. The parallel combination of
RM and RG sets the input impedance. Both the
noninverting and inverting applications of Figure 35
and Figure 36 benefit from optimizing the feedback
resistor (RF) value for bandwidth (see the discussion
in the Gain Setting section). The typical design
sequence is to select the RF value for best
bandwidth, set RG for the gain, and then set RM for
the desired input impedance. As the gain increases
for the inverting configuration, a point is reached
where RG equals 50Ω and RM is removed; thus, the
input match is set by RG only. With RG fixed to
achieve an input match to 50Ω, RF is simply
increased to increase gain. This approach, however,
quickly reduces the achievable bandwidth at such
high gains. For gains greater than 10V/V,
noninverting operation is recommended to maintain
broader bandwidth.
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+5V
+
0.1mF
6.8mF
DIS
VO
1/3
OPA3695
50W
50W Source
RG
50W Load
RF
VI
RM
0.1mF
+
6.8mF
-5V
Figure 36. DC-Coupled, Inverting, Bipolar-Supply,
Specification and Test Circuit
Notice that in this configuration (shown in Figure 36),
the noninverting input is tied directly to ground.
Because the internal design for the OPA3695 is
current-feedback, trying to achieve improved dc
accuracy by including a resistor on the noninverting
input to ground is ineffective. Using a direct short to
ground on the noninverting input reduces both the
contribution of the dc bias current and the noise
current to the output error. While the external RM is
used here to match with the 50Ω source from the test
equipment, the input impedance in this configuration
is limited to the RG resistor. Removing RM does not
strongly impact the dc operating point because the
short on the noninverting input of Figure 36 provides
the dc operating voltage. This application of the
OPA3695 provides a very broadband, high-output
signal inverter.
+VS
50W Source
+5V
0.1mF
+
6.8mF
604W
0.1mF
DIS
VI
60.4W
604W
1/3
OPA3695
VO
100W
VS/2
RF
348W
RG
49.9W
0.1mF
Figure 37. AC-Coupled, G = +8V/V, Single-Supply
Specification and Test Circuit
SINGLE-SUPPLY OPERATION
The OPA3695 may be used over a single-supply
range of +3.5V to +12V. Though not a rail-to-rail
output design, the OPA3695 requires minimal input
and output voltage headroom compared to other
very-wideband video buffer amplifiers. The key
requirement of broadband single-supply operation is
to maintain input and output signal swings within the
useable voltage ranges at both the input and the
output.
The circuit of Figure 37 shows the single-supply
ac-coupled, gain of +8V/V, video buffer circuit used
as the basis for the Electrical Characteristics table
and Typical Characteristics curves. The circuit of
Figure 37 establishes an input midpoint bias using a
14
simple resistive divider from the +5V supply (two
604Ω resistors). The input signal is then ac-coupled
into this midpoint voltage bias. The input voltage can
swing to within 1.6V of either supply pin, giving a
1.8VPP input signal range centered between the
supply pins. The input impedance matching resistor
(60.4Ω) used for testing is adjusted to give a 50Ω
input match when the parallel combination of the
biasing divider network is included. The gain resistor
(RG) is ac-coupled, giving the circuit a dc gain of
+1V/V, which puts the input dc bias voltage (2.5V) on
the output as well. Again, on a single +5V supply, the
output voltage can swing to within 1V of either supply
pin while delivering ±90mA output current. A
demanding 100Ω load to a midpoint bias is used in
this characterization circuit. The new output stage
used in the OPA3695 can deliver large bipolar output
current into this midpoint load with minimal crossover
distortion, as illustrated by the +5V supply,
third-harmonic distortion plots.
While the circuit of Figure 37 shows +5V
single-supply operation, this same circuit may be
used for single supplies that range as high as +12V
nominal. The noninverting input bias resistors are
relatively low in Figure 37 to minimize output dc offset
as a result of noninverting input bias current. At
higher signal-supply voltages, these resistors should
be increased in order to limit the added supply
current drawn through this path.
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Figure 38 shows the ac-coupled, G = +2V/V,
single-supply specification and test circuit. Once
again, the noninverting input is dc-biased at
midsupply to put that same VS/2 at the output pin.
+5V
22pF
100W
226W
VI
+VS
50W Source
+5V
22pF
0.1mF
+
0W
Source
6.8mF
50W
1/3
OPA3695
VO
50W
RF
604W
604W
0.1mF
DIS
VI
604W
1/3
OPA3695
VO
RG
604W
100W
VS/2
RF
499W
-5V
Figure 39. Line Driver with 40MHz Low-Pass
Active Filter
RG
499W
0.1mF
Figure 38. AC-Coupled, G = +2V/V, Single-Supply
Specification and Test Circuit
HIGH-FREQUENCY ACTIVE FILTERS
The extremely wide bandwidth of the OPA3695
allows an extensive range of active filter topologies to
be implemented with minimal amplifier bandwidth
interaction in the filter shape. While Sallen-Key filters
work very well with current-feedback amplifiers, the
use of multiple feedback (MFB) filters is not
recommended because an MFB filter places a
capacitor in the feedback path which in turn
eliminates compensation and results in an oscillator.
In general, given a desired filter ωO, the amplifier
should have a minimum of 10X ωO to minimize filter
interaction with the amplifier frequency response.
Figure 39 illustrates an example gain of +2 line driver
using the OPA3695 that incorporates a 40MHz
low-pass Butterworth response with only a few
external components. The filter resistor values have
been adjusted slightly here from an ideal filter
analysis to account for parasitic effects.
This type of filter depends on a low output impedance
from the amplifier through very high frequencies to
continue to provide an increasing attenuation with
frequency. As the amplifier output impedance rises
with frequency, any input signal or noise starts to
feed directly through to the output via the feedback
capacitor. Because the OPA3695 used in Figure 39
has a 900MHz bandwidth, the active filter continues
to roll-off through frequencies that exceed 200MHz.
Figure 40 shows the frequency response for the filter
of Figure 39, where the desired 40MHz cutoff is
achieved and a 40dB/dec roll-off is held through very
high frequencies.
9
6
3
0
Gain (dB)
60.4W
-3
-6
-9
-12
-15
-18
-21
-24
1
10
100
1000
Frequency (MHz)
Figure 40. 40MHz Low-Pass Active Filter
Response
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HIGH-SPEED INSTRUMENTATION
AMPLIFIER
MULTIPLEXED CONVERTER DRIVER
The converter driver in Figure 42 multiplexes among
the three input signals with gains of +2V/V, +4V/V,
and +8V/V. The OPA3695 enable and disable times
support multiplexing among video signals. The
make-before-break disable characteristic of the
OPA3695 ensures that the output is always under
control. To avoid large switching glitches, it is best to
switch when the signal on the amplifier inputs are
very close to each other.
Figure 41 shows an instrumentation amplifier circuit
based on the OPA3695. Because all three amplifiers
are on the same silicon die, the offset matching
between inputs makes this configuration an attractive
input
stage
for
this
application.
The
differential-to-single-ended gain for this circuit is
2V/V. The inputs are high-impedance, with only 1.2pF
to ground at each input. The loads on the OPA3695
outputs are equal for the best harmonic distortion
possible.
V1
1/3
OPA3695
604W
604W
604W
604W
1/3
OPA3695
301W
The voltage difference appearing between the
inverting node and the noninverting node should not
exceed ±1.2V. This difference can occur when the
individual amplifier is disabled and a voltage is
applied at the summing node of the three amplifiers.
The resulting inverting node voltage of the disabled
amplifier is easily calculated by using simple resistor
voltage divider methods. In general, as the gain of the
amplifier increases, the less impact this issue has on
the system because of the increased RF/RG ratio.
301W
1/3
OPA3695
604W
VOUT
The output resistors isolate the outputs from each
other when switching between channels. The
feedback network of the disabled channels forms part
of the load seen by the enabled amplifier, attenuating
the signal slightly.
604W
V2
Figure 41. High-Speed Instrumentation Amplifier
V1
100W
1/3
OPA3695
RG
604W
V2
4.99kW
RF
604W
0.1mF
+5V
100W
1/3
OPA3695
RG
169W
0.1mF
4.99kW
REFT
+3.5V
0.1mF
REFB
+1.5V
+In
RF
511W
ADS828
10-Bit
75MSPS
100pF
-In
CM
V3
100W
1/3
OPA3695
RG
57.6W
RF
402W
0.1mF
Selection
Logic
Figure 42. Multiplexed Converter Driver
16
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DESIGN-IN TOOLS
OUTPUT CURRENT AND VOLTAGE
DEMONSTRATION BOARDS
A printed circuit board (PCB) is available to assist in
the initial evaluation of circuit performance using the
OPA3695. The fixture is offered free of charge as an
unpopulated PCB, delivered with a user's guide. The
summary information for this fixture is shown in
Table 1.
Table 1. Demonstration Fixture
PRODUCT
PACKAGE
ORDERING
NUMBER
LITERATURE
NUMBER
OPA3695IDBQ,
noninverting
SSOP-16
DEM-OPA-SSOP-3C
SBOU047
OPA3695IDBQ,
inverting
SSOP-16
DEM-OPA-SSOP-3D
SBOU046
The demonstration fixture can be requested at the
Texas Instruments web site (www.ti.com) through the
OPA3695 product folder.
OPERATING SUGGESTIONS
GAIN SETTING
Similar to other current-feedback amplifiers, the
OPA3695 compensation is dictated by the feedback
resistor—RF. As the resistance increases, more
compensation is added to the amplifier. It is important
to realize that increasing the resistance too far is not
recommended because this increase causes a zero
to form on the inverting input as a result of stray
capacitance. In general, RF should not exceed 1.5kΩ
to 2kΩ, or else stability is a concern. Table 2 shows
the recommended feedback values for common gain
settings. These values are a good starting point; fine
tuning of the resistor value(s) should be done to
account for individual PCB designs and other factors.
Table 2. Recommended Feedback Resistor—RF
GAIN (V/V)
±5V OR 10V
SUPPLY
±2.5V OR 5V
SUPPLY
+1
909Ω
750Ω
+2, –1
604Ω
499Ω
+4
511Ω
453Ω
+8
402Ω
348Ω
+16
249Ω
162Ω
The OPA3695 provides output voltage and current
capabilities that can easily support multiple video
loads and/or 100Ω loads with very low distortion.
Under no-load conditions at +25°C, the output voltage
typically swings to 1V of either supply rail. Into a 15Ω
load (the minimum tested load), it is tested to deliver
±120mA.
The specifications described above, though familiar in
the industry, consider voltage and current limits
separately. In many applications, it is the voltage ×
current, or V-I product, which is more relevant to
circuit operation. Refer to the Output Voltage and
Current Limitations plot (Figure 18) in the Typical
Characteristics. The X- and Y-axes of this graph
show the zero-voltage output current limit and the
zero-current output voltage limit, respectively. The
four quadrants give a more detailed view of the
OPA3695 output drive capabilities, noting that the
graph is bounded by a Safe Operating Area of 1W
maximum internal power dissipation. Superimposing
resistor load lines onto the plot shows that the
OPA3695 can drive ±3.4V into 20Ω or ±3.7V into 50Ω
without exceeding either the output capabilities or the
1W dissipation limit. A 100Ω load line (the standard
test-circuit load) shows full ±3.8V output swing
capability, as shown in the Typical Characteristics.
The minimum specified output voltage and current
specifications over temperature are set by worst-case
simulations at the cold temperature extreme. Only at
cold startup do the output current and voltage
decrease to the numbers shown in the
over-temperature min/max specifications. As the
output transistors deliver power, the junction
temperatures increase, which decreases the VBEs
(increasing the available output voltage swing) and
increases the current gains (increasing the available
output current). In steady-state operation, the
available output voltage and current are always
greater than that shown in the over-temperature
characteristics since the output stage junction
temperatures are higher than the minimum specified
operating ambient.
To maintain maximum output stage linearity, no
output short-circuit protection is provided. This
configuration is not normally a problem, because
most applications include a series matching resistor
at the output that limits the internal power dissipation
if the output side of this resistor is shorted to ground.
However, shorting the output pin directly to an
adjacent positive power-supply pin, in most cases,
destroys the amplifier. If additional protection to a
power-supply short is required, consider a small
series resistor in the power-supply leads. Under
heavy output loads, this resistor reduces the available
output voltage swing. A 5Ω series resistor in each
supply lead, for example, limits the internal power
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dissipation to < 1W for an output short while
decreasing the available output voltage swing only
0.5V, for up to 100mA desired load currents. Always
place the 0.1µF power-supply decoupling capacitors
after these supply-current limiting resistors directly on
the device supply pins.
DRIVING CAPACITIVE LOADS
One of the most demanding, and yet very common,
load conditions for an op amp is capacitive loading.
Often, the capacitive load is the input of an ADC,
including additional external capacitance, which may
be recommended to improve ADC linearity. A
high-speed, high open-loop gain amplifier such as the
OPA3695 can be very susceptible to decreased
stability and may give closed-loop response peaking
when a capacitive load is placed directly on the
output pin. When the amplifier open-loop output
resistance is considered, this capacitive load
introduces an additional pole in the signal path,
resulting in a feedback path zero that can decrease
the phase margin. Several external solutions to this
problem have been suggested. When the primary
considerations are frequency response flatness,
pulse response fidelity, and/or distortion, the simplest
and most effective solution is to isolate the capacitive
load from the feedback loop by inserting a series
isolation resistor between the amplifier output and the
capacitive load. The isolation acts to reduce the
phase lag from the capacitive load pole, thus
increasing the phase margin and improving stability.
The Typical Characteristics show a Recommended
RS vs Capacitive Load curve (Figure 33) to help the
designer pick a value to give < 0.5dB peaking to the
load. The resulting frequency response curves show
a 0.5dB peaked response for several selected
capacitive loads and recommended RS combinations.
Parasitic capacitive loads greater than 2pF can begin
to degrade the performance of the OPA3695. Long
PCB traces, unmatched cables, and connections to
other amplifier inputs can easily exceed this value.
Always consider this effect carefully and add the
recommended series resistor as close as possible to
the OPA3695 output pin (see the Board Layout
Guidelines section).
The criterion for setting this RS resistor is a maximum
bandwidth, flat frequency response at the load
(< 0.5dB peaking). For the OPA3695 operating at a
gain of +2V/V, the frequency response at the output
pin is flat to begin with, allowing relatively small
values of RS to be used for low capacitive loads.
18
DISTORTION PERFORMANCE
The OPA3695 provides good distortion performance
into a 100Ω load on ±5V supplies. Relative to
alternative solutions, the OPA3695 holds much lower
distortion at higher frequencies (> 20MHz) than
alternative solutions. Generally, until the fundamental
signal reaches very high-frequency or power levels,
the second harmonic dominates the distortion with a
negligible third-harmonic component. Focusing then
on the second harmonic, increasing the load
impedance improves distortion directly. Remember
that the total load includes the feedback network—in
the noninverting configuration (see Figure 35), this
value is the sum of RF + RG, while in the inverting
configuration it is only RF (see Figure 36). Also,
providing an additional supply decoupling capacitor
(0.01µF) between the supply pins (for bipolar
operation) improves the second-order distortion
slightly (3dB to 6dB).
The OPA3695 has very low third-order harmonic
distortion—especially with high gains. This feature
also produces a high two-tone, third-order
intermodulation intercept. Two graphs for this
intercept are given in the in the Typical
Characteristics; one for ±5V and one for +5V. The
curves shown in each graph is defined at the 50Ω
load when driven through a 50Ω matching resistor, to
allow direct comparisons to RF MMIC devices.
The intercept is used to predict the intermodulation
spurious levels for two closely-spaced frequencies. If
the two test frequencies (f1 and f2) are specified in
terms of average and delta frequency, fO = (f1 + f2)/2
and Δf = |f2 – f1|/2, then the two, 3rd-order, close-in
spurious tones appear at fO ±3 × Δf. The difference
between two equal test tone power levels and these
intermodulation spurious power levels is given by
ΔdBc = 2 × (IM3 – PO), where IM3 is the intercept
taken from the Typical Characteristics and PO is the
power level in dBm at the 50Ω load for one of the two
closely-spaced test frequencies. For instance, at
40MHz, the OPA3695 at a gain of +8V/V has an
intercept of 35dBm at a matched 50Ω load. If the full
envelope of the two frequencies must be 2VPP at this
load, this requires each tone to be 4dBm (1VPP). The
third-order intermodulation spurious tones is then 2 ×
(35 – 4) = 62dBc below the test tone power level
(–79dBm).
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NOISE PERFORMANCE
DC ACCURACY AND OFFSET CONTROL
The OPA3695 offers an excellent balance between
voltage and current noise terms to achieve a low
output noise under a variety of operating conditions.
The input noise voltage (1.8nV/√Hz) is very low for a
unity-gain stable amplifier. This low input voltage
noise was achieved at the price of higher
noninverting input current noise (18pA/√Hz). As long
as the ac source impedance looking out of the
noninverting input is less than 100Ω, this current
noise does not contribute significantly to the total
output noise. The op amp input voltage noise and the
two input current noise terms combine to give low
output noise using the OPA3695. Figure 43 shows
the op amp noise analysis model with all of the noise
terms included. In this model, all noise terms are
taken to be noise voltage or current density terms in
either nV/√Hz or pA/√Hz.
A current-feedback op amp such as the OPA3695
provides exceptional bandwidth and slew rate, giving
fast pulse settling but only moderate dc accuracy.
The Electrical Characteristics show an input offset
voltage comparable to high-speed voltage-feedback
amplifiers. However, the two input bias currents are
somewhat higher and are unmatched. Whereas bias
current cancellation techniques are very effective with
most voltage-feedback op amps, they do not
generally reduce the output dc offset for wideband
current-feedback op amps. Because the two input
bias currents are unrelated in both magnitude and
polarity, matching the source impedance looking out
of each input to reduce the error contributions to the
output is ineffective. Evaluating the configuration of
Figure 35 using a gain of +2V/V, using worst-case
+25°C input offset voltage, and the two input bias
currents, gives a worst-case output offset range equal
to:
VOS = ±(NG ´ VOS) ± (IBN ´ RS/2 ´ NG) ± (IBI ´ RF)
= ±(2 ´ 3.5mV) ± (30mA ´ 25W ´ 2) ± (60mA ´ 604W)
= ±7mV ± 1.5mV ± 36.2mV
= ±44.7mV
ENI
1/3
OPA3695
RS
EO
IBN
ERS
where NG = noninverting signal gain.
RF
4kTRS
RG
4kT
RG
Minimizing the resistance seen by the noninverting
input also minimizes the output dc error. For
improved dc precision in a wideband low-gain
amplifier, consider the OPA842 where a bipolar input
is acceptable (low source resistance) or the OPA656
where a JFET input is required.
4kTRF
IBI
4kT = 1.6E -20J
at 290°K
Figure 43. Op Amp Noise Model
DISABLE OPERATION
The total output spot noise voltage can be computed
as the square root of the sum of all squared output
noise voltage contributors. Equation 1 shows the
general form for the output noise voltage using the
terms shown in Figure 43.
EO =
2
2
2
2
ENI + (IBNRS) + 4kTRS NG + (IBIRF) + 4kTRFNG
(1)
Dividing this expression through by noise gain (NG =
1 + RF/RG) gives the equivalent input-referred spot
noise voltage at the noninverting input, as shown in
Equation 2.
EN =
2
2
ENI + (IBNRS) + 4kTRS +
IBIRF
NG
2
+
4kTRF
The OPA3695 provides an optional disable feature
that can be used to reduce system power. If the VDIS
control pin is left unconnected, the OPA3695
operates normally. This shutdown is intended only as
a power-savings feature. Forward path isolation when
disabled is very good for small signals when
configured for low gains. However, large-signal
isolation is not ensured because of the ±1.2V
limitation between the inverting node and the
noninverting node. Failure to properly account for this
voltage may cause undesirable responses in the
output signal when multiplexed. Configuring the
amplifier for high gains helps minimize this impact,
but it is not ensured; proper analysis should be done
by the designer.
NG
(2)
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Turn-on time is very quick from the shutdown
condition (typically < 25ns). Turn-off time strongly
depends on the selected gain configuration and load,
but is typically 1µs for the circuit of Figure 35. To shut
down, the control pin must be asserted low. This logic
control is referenced to the positive supply, as the
simplified circuit of Figure 44 shows.
+VS
15kW
Q1
110kW
25kW
VDIS
IS
Control
-VS
Figure 44. Simplified Disable Control Circuit
In normal operation, base current to Q1 is provided
through the 110kΩ resistor while the emitter current
through the 15kΩ resistor sets up a voltage drop that
is inadequate to turn on the two diodes in the Q1
emitter. As VDIS is pulled low, additional current is
pulled through the 15kΩ resistor, eventually turning
on these two diodes (≈ 80µA). At this point, any
further current pulled out of VDIS goes through those
diodes, holding the emitter-base voltage of Q1 at
approximately 0V. This sequence shuts off the
collector current out of Q1, turning the amplifier off.
The supply current in the shutdown mode is only that
required to operate the circuit of Figure 44.
The shutdown feature for the OPA3695 is a
positive-supply-referenced,
current-controlled
interface. Open-collector (or drain) interfaces are
most effective, as long as the controlling logic can
sustain the resulting voltage (in the open mode) that
appears at the VDIS pin. That voltage is one diode
below the positive supply voltage applied to the
OPA3695. For voltage output logic interfaces, the
on/off voltage levels described in the Electrical
Characteristics apply only for a +5V positive supply
on the OPA3695. An open-drain interface is
recommended for shutdown operation using a higher
positive supply for the OPA3695 and/or logic families
with inadequate high-level voltage swings.
20
THERMAL ANALYSIS
The OPA3695 does not require heatsinking or airflow
in most applications. Maximum desired junction
temperature sets the maximum allowed internal
power dissipation as described here. In no case
should the maximum junction temperature be allowed
to exceed +150°C.
Operating junction temperature (TJ) is given by TA +
PD × θJA. The total internal power dissipation (PD) is
the sum of quiescent power (PDQ) and additional
power dissipated in the output stage (PDL) to deliver
load power. Quiescent power is simply the specified
no-load supply current times the total supply voltage
across the part. PDL depends on the required output
signal and load but would, for a grounded resistive
load, be at a maximum when the output is fixed at a
voltage equal to 1/2 either supply voltage (for equal
bipolar supplies). Under this worst-case condition,
PDL = VS2/(4 × RL) where RL includes feedback
network loading. This value is the absolute highest
power that can be dissipated for a given RL. All actual
applications dissipate less power in the output stage.
Note that it is the power in the output stage and not
into the load that determines internal power
dissipation.
As a worst-case example, compute the maximum TJ
using an OPA3695IDBQ (SSOP-16 package) in the
circuit of Figure 35 operating at the maximum
specified ambient temperature of +85°C and driving a
grounded 100Ω load at VS/2. Maximum internal
power is:
2
PD = 10V ´ 42.6mA + 3 ´ 5 /(4 ´ (100W || 1.2kW)) = 629mW
Maximum TJ = +85°C + (0.629W ´ 80°C/W) = 135°C
Actual applications operate at a lower junction
temperature than the +135°C computed above. This
condition is because the RMS voltage of the output
signals vary, along with the fact that part of the
quiescent current is steered to the output, thus
reducing the 10V × 42.6mA dominant term. Compute
the actual output stage power to get an accurate
estimate of maximum junction temperature, or use
the results shown here as an absolute worst case
maximum scenario.
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BOARD LAYOUT GUIDELINES
Achieving
optimum
performance
with
a
high-frequency amplifier such as the OPA3695
requires careful attention to PCB layout parasitics and
external component types. Recommendations that
optimize OPA3695 performance include:
a) Minimize parasitic capacitance to any ac ground
for all of the signal I/O pins. Parasitic capacitance on
the output can cause instability; on the noninverting
input, it can react with the source impedance to
cause unintentional bandlimiting. To reduce
unwanted capacitance, create a window around the
signal I/O pins in all of the ground and power planes
around those pins. Otherwise, ground and power
planes should be unbroken elsewhere on the board.
b) Minimize the distance (< 0.25” or 6,35mm) from
the power-supply pins to high-frequency 0.1µF
decoupling capacitors. At the device pins, the ground
and power-plane layout should not be in close
proximity to the signal I/O pins. Avoid narrow power
and ground traces to minimize inductance between
the pins and the decoupling capacitors. The
power-supply connections should always be
decoupled with these capacitors. Larger (2.2µF to
6.8µF) decoupling capacitors, effective at lower
frequency, should also be used on the supply pins.
These capacitors may be placed somewhat farther
from the device and may be shared among several
devices in the same area of the PCB.
c) Careful selection and placement of external
components
preserve
the
high-frequency
performance of the OPA3695. Use resistors that
have
low
reactance
at
high
frequencies.
Surface-mount resistors work best and allow a tighter
overall layout. Metal film and carbon composition
axially-leaded resistors can also provide good
high-frequency performance. Again, keep the leads
and PCB trace length as short as possible. Never use
wirewound type resistors in a high-frequency
application. The output pin and inverting input pin are
the most sensitive to parasitic capacitance; therefore,
always position the series output resistor, if any, as
close as possible to the output pin. Other network
components, such as noninverting input termination
resistors, should also be placed close to the package.
Where double-side component mounting is allowed,
place the feedback resistor directly under the
package on the other side of the board between the
output and inverting input pins. The frequency
response is primarily determined by the feedback
resistor value, as described previously. Increasing its
value reduces the bandwidth, while decreasing it
gives a more peaked frequency response. The 604Ω
feedback resistor (used in the typical performance
specifications at a gain of +2V/V on ±5V supplies) is
a good starting point for design. Note that a 909Ω
feedback resistor, rather than a direct short, is
required for the unity-gain follower application. A
current-feedback op amp requires a feedback
resistor—even
in
the
unity-gain
follower
configuration—to control stability. Good axial metal
film or surface-mount resistors have approximately
0.2pF in shunt with the resistor. For resistor values
greater than 2.0kΩ, this parasitic capacitance can
add a pole and/or zero below 400MHz that can affect
circuit operation. Keep resistor values as low as
possible consistent with load driving considerations.
d) Connections to other wideband devices on the
PCB may be made with short direct traces or through
onboard transmission lines. For short connections,
consider the trace and the input to the next device as
a lumped capacitive load. Relatively wide traces
(50mils to 100mils, or 1,27mm to 2,54mm) should be
used, preferably with ground and power planes
opened up around them. Estimate the total capacitive
load and set RS from the plot of Recommended RS vs
Capacitive Load (Figure 33). Low parasitic capacitive
loads (< 4pF) may not need an RS because the
OPA3695 is nominally compensated to operate with a
2pF parasitic load. If a long trace is required, and the
6dB signal loss intrinsic to a doubly-terminated
transmission line is acceptable, implement a matched
impedance transmission line using microstrip or
stripline techniques (consult an ECL design handbook
for microstrip and stripline layout techniques). A 50Ω
environment is normally not necessary on board, and
in fact, a higher impedance environment improves
distortion, as shown in the distortion versus load
plots. With a characteristic board trace impedance
defined based on board material and trace
dimensions, a matching series resistor into the trace
from the output of the OPA3695 is used, as well as a
terminating shunt resistor at the input of the
destination device. Remember also that the
terminating impedance is the parallel combination of
the shunt resistor and the input impedance of the
destination device; this total effective impedance
should be set to match the trace impedance. If the
6dB attenuation of a doubly-terminated transmission
line is unacceptable, a long trace can be
series-terminated at the source end only. Treat the
trace as a capacitive load in this case and set the
series resistor value as illustrated in the plot of
Figure 33. This configuration does not preserve signal
integrity as well as a doubly-terminated line. If the
input impedance of the destination device is low,
there will be some signal attenuation as a result of
the voltage divider formed by the series output into
the terminating impedance.
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e) Socketing a high-speed part such as the
OPA3695 is not recommended. The additional lead
length and pin-to-pin capacitance introduced by the
socket can create an extremely troublesome parasitic
network, which can make it almost impossible to
achieve a smooth, stable frequency response. Best
results are obtained by soldering the OPA3695
directly onto the board.
External
Pin
Internal
Circuitry
-VCC
Figure 45. Internal ESD Protection
INPUT AND ESD PROTECTION
The OPA3695 is built using a very high-speed
complementary bipolar process. The internal junction
breakdown voltages are relatively low for these very
small geometry devices. These breakdowns are
reflected in the Absolute Maximum Ratings table. All
device pins are protected with internal ESD protection
diodes to the power supplies, as shown in Figure 45.
22
+VCC
These diodes provide moderate protection to input
overdrive voltages above the supplies as well. The
protection diodes can typically support 30mA
continuous current. Where higher currents are
possible (for example, in systems with ±15V supply
parts driving into the OPA3695), current limiting
series resistors may be added on the noninverting
input. Keep this resistor value as low as possible;
high values degrade both noise performance and
frequency response.
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EVALUATION MODULE
To evaluate the OPA3695, an evaluation module
(EVM) is available. This EVM allows for testing the
OPA3695 in many different systems. Inputs and
outputs include SMA connectors commonly found in
high-frequency systems along with 50Ω characteristic
impedance traces. Because the traces are very short,
changing the input and output terminations resistors
from 49.9Ω to 75Ω has essentially no impact when
evaluating video signals. Several unpopulated
component pads are found on the EVM to allow for
different input and output configurations as dictated
by the user.
By default, all channels of the EVM are configured for
a noninverting gain of +2V/V. If inverting configuration
or differential input configuration is desired, then
simply replacing R1, R4, and R7 with desired
resistors allows these configurations to be set up
quite easily. Also, the feedback and gain resistors
can be easily replaced to allow for any gain desired.
Note that even though the default gain of the
OPA3695 is +2V/V, or 6dB, the output 49.9Ω source
termination resistors (R13, R14, and R15) and the
user-applied
50Ω
end-termination
resistance
commonly found in test systems makes the overall
system gain appear as 0dB.
Each channel's disable control is independently
configured. By default, the use of jumpers JP1, JP2,
and JP3 allows for a quick and easy method to
evaluate the disable function of the OPA3695.
However, if this control must be externally controlled,
then using the SMA connectors J10, J11, and J12 is
recommended. The termination resistors R19, R20,
and R21 should to be changed to match the source
impedance, but it is not required. Attention to the
voltage appearing at each disable pin is required to
ensure proper operation of this feature. The voltage
at the disable pin is shown in the Electrical
Characteristics section of this data sheet.
This EVM is designed to be primarily used with split
supplies from ±2.5V up to ±6V. This EVM can be
used with a 5V single-supply up to 12V, but care
must be taken to account for the input termination
resistor connections to ground. Adiitionally, the 100uF
bypass capcitors C1 and C2 are rate at 10V. If single
supply is used with more than 10V applied, these
capacitors should be changed to accomodate the
increased supply voltage. The OPA3695 allowable
input range is defined in the Electrical Characteristics
section of this datasheet and must be adhered to for
proper operation. Also note that the gain setting
resistors are also connected to ground. Thus, any dc
offset is increased proportionally by the gain. As
such, using the EVM as a split supply is
recommended even if the final use is single-supply.
Example: if the final usage is to be 12V single-supply,
then using ±6V supplies simplifies the dc reference
voltage to mid-rail—or an equivalent 6V for a
single-supply configuration.
Figure 46 shows the OPA3695EVM schematic.
Figure 47 to Figure 50 illustrate the four layers of the
EVM PCB, incorporating standard high-speed layout
practices. Table 3 lists the Bill of Materials for the
EVM as supplied from Texas Instruments.
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+
+
Figure 46. OPA3695D EVM Schematic
24
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Figure 47. OPA3695D EVM PCB: Top Layer
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25
OPA3695
SBOS355A – APRIL 2008 – REVISED SEPTEMBER 2008 ............................................................................................................................................... www.ti.com
Figure 48. OPA3695D EVM PCB: Layer 2
26
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OPA3695
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Figure 49. OPA3695D EVM PCB: Layer 3
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OPA3695
SBOS355A – APRIL 2008 – REVISED SEPTEMBER 2008 ............................................................................................................................................... www.ti.com
Figure 50. OPA3695D EVM PCB: Bottom Layer
28
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OPA3695
www.ti.com ............................................................................................................................................... SBOS355A – APRIL 2008 – REVISED SEPTEMBER 2008
OPA3695EVM Bill of Materials
Table 3. OPA3695D EVM
ITEM
REF DES
QTY
DESCRIPTION
SMD SIZE
1
FB1, FB2
2
Bead, Ferrite, 3A, 80Ω
C1, C2
2
Capacitor, 100µF, Tantalum, 10V, 10%,
Low-ESR
3
C6, C10
2
Open
0603
4
C3–C5, C7–C9
6
Capacitor, 0.1µF, Ceramic, 16V, X7R
5
R10–R12
3
6
R16–R18
7
MANUFACTURER
PART NUMBER
DISTRIBUTOR
PART NUMBER
1206
(Steward) HI1206N800R-00
(Digi-Key) 240-1010-1-ND
C
(AVX) TPSC107K010R0100
(Digi-Key) 478-1765-1-ND
0603
(AVX) 0603YC104KAT2A
(Digi-Key) 478-1239-1-ND
Resistor, 604Ω, 1/16W, 1%
0402
(KOA) RK73H1ETTP6040F
(Garrett)
RK73H1ETTP6040F
3
Open
0603
R1, R4, R7
3
Resistor, 0Ω, 1/10W
0603
(ROHM) MCR03EZPJ000
(Digi-Key)
RHM0.0GCT-ND
8
R2, R5, R8,
R13–R15
6
Resistor, 49.9Ω, 1/10W, 1%
0603
(ROHM) MCR03EZPFX49R9
(Digi-Key)
RHM49.9HCT-ND
9
R25–R27
3
Resistor, 100Ω, 1/10W, 1%
0603
(ROHM) MCR03EZPFX1000
(Digi-Key)
RHM100HCT-ND
10
R3, R6, R9
3
Resistor, 604Ω, 1/10W, 1%
0603
(ROHM) MCR03EZPFX6040
(Digi-Key)
RHM604HCT-ND
11
R22–R24
3
Resistor, 1kΩ, 1/10W, 1%
0603
(ROHM) MCR03EZPFX1001
(Digi-Key)
RHM1.00KHCT-ND
12
R19–R21
3
Resistor, 4.99kΩ, 1/10W, 1%
0603
(ROHM) MCR03EZPFX4991
(Digi-Key)
RHM4.99KHCT-ND
13
J13–J15
3
Jack, Banana Receptance, 0.25" dia. hole
(SPC) 813
(Newark) 39N867
14
J1–J12
12
Connector, edge, SMA PCB Jack
(Johnson) 142-0701-801
(Newark) 90F2624
15
JP1–JP3
3
Header, 0.1" CTRS, 0.025" square pins
(Sullins) PCB36SAAN
(Digi-Key) S1011E-36-ND
16
JP1–JP3
2
2 possible
3
Shunts
(Sullins) SSC02SYAN
(Digi-Key) S9002-ND
17
4
Standoff, 4-40 hex, 0.625" length
(Keystone) 1808
(Digi-Key) 1808K-ND
18
4
Screw, Phillips, 4-40, .250"
(BF) PMS 440 0031 PH
(Digi-Key) H343-ND
1
IC, OPA3695DBQ
(TI) OPA3695DBQ
1
Printed circuit board
(TI) Edge# 6499960 Rev. A
19
20
U1
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OPA3695
SBOS355A – APRIL 2008 – REVISED SEPTEMBER 2008 ............................................................................................................................................... www.ti.com
Revision History
Changes from Original (April 2008) to Revision A .......................................................................................................... Page
•
•
30
Changed storage temperature range rating in Absolute Maximum Ratings table from –40°C to +125°C to –65°C to
+125°C ................................................................................................................................................................................... 2
Added Evaluation Module section ....................................................................................................................................... 23
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OPA3695
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EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have
electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental
measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does
not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling
(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER
AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or
services described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This
notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or
safety programs, please contact the TI application engineer or visit www.ti.com/esh.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used.
FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio
frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are
designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may
be required to correct this interference.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of ±1.7V to ±6.5V dual supply and the output voltage range of 0V to ±6.5V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions
concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than +85°C. The EVM is designed to operate
properly with certain components above +85°C as long as the input and output ranges are maintained. These components include but are
not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2008, Texas Instruments Incorporated
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PACKAGE OPTION ADDENDUM
www.ti.com
6-Aug-2021
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
OPA3695IDBQ
ACTIVE
SSOP
DBQ
16
75
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 85
OP3695
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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