LT1395/LT1396/LT1397
Single/Dual/Quad 400MHz
Current Feedback Amplifier
DESCRIPTION
FEATURES
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400MHz Bandwidth on ± 5V (AV = 1)
350MHz Bandwidth on ±5V (AV = 2, –1)
0.1dB Gain Flatness: 100MHz (AV = 1, 2 and –1)
High Slew Rate: 800V/μs
Wide Supply Range: ±2V(4V) to ±6V(12V)
80mA Output Current
Low Supply Current: 4.6mA/Amplifier
LT1395: SO-8, TSOT23-5 and TSOT23-6 Packages
LT1396: SO-8, MSOP and Tiny 3mm × 3mm ×
0.75mm DFN-8 Packages
LT1397: SO-14, SSOP-16 and Tiny 4mm × 3mm ×
0.75mm DFN-14 Packages
Low Profile (1mm) ThinSOT™ Package
APPLICATIONS
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Cable Drivers
Video Amplifiers
MUX Amplifiers
High Speed Portable Equipment
IF Amplifiers
The LT ®1395/LT1396/LT1397 are single/dual/quad 400MHz
current feedback amplifiers with an 800V/μs slew rate and
the ability to drive up to 80mA of output current.
The LT1395/LT1396/LT1397 operate on all supplies from a
single 4V to ±6V. At ±5V, they draw 4.6mA of supply current per amplifier. The LT1395CS6 also adds a shutdown
pin. When disabled, the LT1395CS6 draws virtually zero
supply current and its output becomes high impedance.
The LT1395CS6 will turn on in only 30ns and turn off in
40ns, making it ideal in spread spectrum and portable
equipment applications.
For space limited applications, the LT1395 is available in
TSOT-23 packages, the LT1396 is available in a tiny 3mm ×
3mm × 0.75mm dual fine pitch leadless DFN package, and
the LT1397 is available in a tiny 4mm × 3mm × 0.75mm
DFN package.
The LT1395/LT1396/LT1397 are manufactured on Linear
Technology’s proprietary complementary bipolar process.
They have standard single/dual/quad pinouts and they are
optimized for use on supply voltages of ±5V.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Loop-Through Amplifier
Frequency Response
Unity-Gain Video Loop-Through Amplifier
RG1
1.02k
RG2
63.4Ω
RF1
255Ω
10
RF2
255Ω
0
NORMAL SIGNAL
–
3.01k
VIN–
0.67pF
HIGH INPUT RESISTANCE
DOES NOT LOAD CABLE
EVEN WHEN POWER IS OFF
–
1/2
LT1396
3.01k VIN+
+
12.1k
0.67pF
BNC INPUTS
1/2
LT1396
+
12.1k
VOUT
1% RESISTORS
FOR A GAIN OF G:
VOUT = G (VIN+ – VIN– )
RF1 = RF2
RG1 = (5G – 1) RF2
RF2
RG2 =
(5G – 1)
TRIM CMRR WITH RG1
1395/6/7 TA01
GAIN (dB)
–10
–20
–30
–40
COMMON MODE SIGNAL
–50
–60
100
1k
10k 100k
1M
10M 100M 1G
FREQUENCY (Hz)
1395/6/7 TA02
139567fd
1
LT1395/LT1396/LT1397
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V + to V –) .............................12.6V
Input Current (Note 2)......................................... ±10mA
Output Current .................................................. ±100mA
Differential Input Voltage (Note 2).............................±5V
Output Short-Circuit Duration (Note 3) ........ Continuous
Operating Temperature Range (Note 4)
LT1395C/LT1396C/LT1397C ................ –40°C to 85°C
LT1397H ........................................... –40°C to 125°C
Specified Temperature Range (Note 5)
LT1395C/LT1396C/LT1397C .................... 0°C to 70°C
LT1397H ........................................... –40°C to 125°C
Storage Temperature Range.................. –65°C to 150°C
Storage Temperature Range
(DD Package) .................................... –65°C to 125°C
Junction Temperature (Note 6)
150°C
Junction Temperature (DD Package) (Note 6)..... 125°C
Lead Temperature (Soldering, 10 sec) ................. 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
TOP VIEW
OUT A 1
8
V+
–IN A 2
7
OUT B
+IN A 3
6
–IN B
–
5
+IN B
V
4
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 160°C/W (NOTE 3)
UNDERSIDE METAL CONNECTED TO V–
(PCB CONNECTION OPTIONAL)
OUT A
1
–IN A
2
+IN A
3
V+
4
OUT A
1
14 OUT D
–IN A
2
13 –IN D
+IN A
3
12 +IN D
V+
4
11 V–
+IN B
5
6
16 OUT D
– 15 –IN D
+
14 +IN D
–
+
13 V–
+ 12 +IN C
–
11 –IN C
+
–
+IN B
5
10 +IN C
–IN B
–IN B
6
9 –IN C
OUT B
7
10 OUT C
OUT B
7
8 OUT C
NC
8
9
DE14 PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 150°C, θJA = 43°C/W, θJC = 4.3°C/W
EXPOSED PAD (PIN 15) IS V–
MUST BE SOLDERED TO PCB
NC
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 150°C, θJA = 135°C/W
TOP VIEW
14 OUT D
OUT A 1
–IN A 2
+IN A 3
V+ 4
TOP VIEW
OUT A
–IN A
+IN A
V–
1
2
3
4
–
+
–
+
–
+
8
7
6
5
V+
OUT B
–IN B
+IN B
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 250°C/W
+IN B 5
–IN B 6
OUT B 7
– 13 –IN D
+
12 +IN D
TOP VIEW
11 V–
+
–
+ 10 +IN C
–
9 –IN C
8
OUT C
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 100°C/W
5 V+
OUT 1
V– 2
+IN 3
+
–
4 –IN
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 250°C/W
139567fd
2
LT1395/LT1396/LT1397
PIN CONFIGURATION
TOP VIEW
TOP VIEW
OUT 1
V– 2
+IN 3
+
–
NC 1
6 V+
–IN 2
5 EN
+IN 3
4 –IN
V– 4
–
+
TOP VIEW
8
NC
OUT A 1
7
V+
–IN A 2
6
OUT
+IN A 3
5
NC
S8 PACKAGE (1395)
8-LEAD PLASTIC SO
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 230°C/W
TJMAX = 150°C, θJA = 150°C/W
–
+
V– 4
–
+
8
V+
7
OUT B
6
–IN B
5
+IN B
S8 PACKAGE (1396)
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LT1396CDD#PBF
LT1397CDE#PBF
LT1397HDE#PBF
LT1397CGN#PBF
LT1396CMS8#PBF
LT1397CS#PBF
LT1395CS5#PBF
LT1395CS6#PBF
LT1395CS8#PBF
LT1396CS8#PBF
LT1396CDD#TRPBF
LT1397CDE#TRPBF
LT1397HDE#TRPBF
LT1397CGN#TRPBF
LT1396CMS8#TRPBF
LT1397CS#TRPBF
LT1395CS5#TRPBF
LT1395CS6#TRPBF
LT1395CS8#T RPBF
LT1396CS8#TRPBF
LABD
1397
1397
1397
LTDY
1397CS
LTMA
LTMF
1395
1396
8-Lead (3mm × 3mm) Plastic DFN
14-Lead (4mm × 3mm) Plastic DFN
14-Lead (4mm × 3mm) Plastic DFN
16-Lead Plastic SSOP
8-Lead Plastic MSOP
14-Lead Plastic SO
5-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
8-Lead Plastic SO
8-Lead Plastic SO
0°C to 70°C
0°C to 70°C
–40°C to 125°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
LEAD BASED FINISH
LT1396CDD
LT1397CDE
LT1397HDE
LT1397CGN
LT1396CMS8
LT1397CS
LT1395CS5
LT1395CS6
LT1395CS8
LT1396CS8
TAPE AND REEL
LT1396CDD#TR
LT1397CDE#TR
LT1397HDE#TR
LT1397CGN#TR
LT1396CMS8#TR
LT1397CS#TR
LT1395CS5#TR
LT1395CS6#TR
LT1395CS8#TR
LT1396CS8#TR
PART MARKING*
LABD
1397
1397
1397
LTDY
1397CS
LTMA
LTMF
1395
1396
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 125°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
8-Lead (3mm × 3mm) Plastic DFN
14-Lead (4mm × 3mm) Plastic DFN
14-Lead (4mm × 3mm) Plastic DFN
16-Lead Plastic SSOP
8-Lead Plastic MSOP
14-Lead Plastic SO
5-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
8-Lead Plastic SO
8-Lead Plastic SO
Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts.
*Temperature grades are identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
139567fd
3
LT1395/LT1396/LT1397
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25°C.
For each amplifier: VCM = 0V, VS = ±5V, EN = 0.5V, pulse tested, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
VOS
Input Offset Voltage
ΔVOS/ΔT
Input Offset Voltage Drift
+
CONDITIONS
MIN
MAX
UNITS
1
± 10
± 12
mV
mV
●
●
IIN
Noninverting Input Current
IIN–
Inverting Input Current
en
Input Noise Voltage Density
f = 1kHz, RF = 1k, RG = 10Ω, RS = 0Ω
+in
Noninverting Input Noise Current Density
f = 1kHz
– in
Inverting Input Noise Current Density
f = 1kHz
RIN
Input Resistance
VIN = ± 3.5V
CIN
Input Capacitance
VINH
Input Voltage Range, High
VS = ±5V
VS = 5V, 0V
●
VINL
Input Voltage Range, Low
VS = ± 5V
VS = 5V, 0V
●
VOUTH
Output Voltage Swing, High
VS = ± 5V
VS = ± 5V
VS = 5V, 0V
●
VS = ± 5V
VS = ± 5V
VS = 5V, 0V
●
VS = ±5V, RL = 150Ω
VS = ±5V, RL = 150Ω
VS = 5V, 0V; RL = 150Ω
●
VOUTL
TYP
15
10
±25
±30
μA
μA
10
±50
±60
μA
μA
●
●
Output Voltage Swing, Low
VOUTH
Output Voltage Swing, High
VOUTL
Output Voltage Swing, Low
●
●
–ICMRR
Inverting Input Current
Common Mode Rejection
VCM = ±3.5V
VCM = ±3.5V
●
●
VS = ± 2V to ±5V
– IPSRR
Inverting Input Current
Power Supply Rejection
VS = ±2V to ±5V
AV
Large-Signal Voltage Gain
pA/√Hz
1
MΩ
2.0
pF
4.0
4.0
V
V
–4.0
1.0
3.9
3.7
– 3.5
4.2
3.4
3.2
42
56
–3.9
–3.7
V
V
V
V
V
V
0.6
V
V
V
52
dB
–3.4
–3.2
16
22
μA/V
μA/V
1
2
3
μA/V
μA/V
2
7
μA/V
70
●
●
V
V
V
V
V
3.6
10
VOUT = ± 2V, RL = 150Ω
–
25
3.6
VCM = ±3.5V
VS = ±2V to ±5V
pA/√Hz
–3.6
Common Mode Rejection Ratio
Power Supply Rejection Ratio
6
0.8
CMRR
Noninverting Input Current
Power Supply Rejection
nV/√Hz
–4.2
●
PSRR
3.5
4.5
4.2
VS = ±5V, RL = 150Ω
VS = ±5V, RL = 150Ω
VS = 5V, 0V; RL = 150Ω
+IPSRR
0.3
μV/°C
50
65
40
100
dB
dB
ROL
Transimpedance, ΔVOUT/ΔIIN
VOUT = ±2V, RL = 150Ω
IOUT
Maximum Output Current
RL = 0Ω
●
IS
Supply Current per Amplifier
VOUT = 0V
●
4.6
6.5
mA
Disable Supply Current
EN Pin Voltage = 4.5V, RL = 150Ω
(LT1395CS6 only)
●
0.1
100
μA
IEN
Enable Pin Current
(LT1395CS6 only)
30
110
200
μA
μA
SR
Slew Rate (Note 7)
mA
●
AV = – 1, RL = 150Ω
kΩ
80
500
800
V/μs
139567fd
4
LT1395/LT1396/LT1397
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25°C.
For each amplifier: VCM = 0V, VS = ±5V, pulse tested, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
TYP
MAX
tON
Turn-On Delay Time (Note 9)
RF = RG = 255Ω, RL = 100Ω, (LT1395CS6 only)
MIN
30
75
UNITS
ns
tOFF
Turn-Off Delay Time (Note 9)
RF = RG = 255Ω, RL = 100Ω, (LT1395CS6 only)
40
100
ns
–3dB BW
–3dB Bandwidth
A V = 1, RF = 374Ω, RL = 100Ω
A V = 2, RF = RG = 255Ω, RL = 100Ω
400
350
MHz
MHz
0.1dB BW
0.1dB Bandwidth
A V = 1, RF = 374Ω, RL = 100Ω
A V = 2, RF = RG = 255Ω, RL = 100Ω
100
100
MHz
MHz
tr, tf
Small-Signal Rise and Fall Time
RF = RG = 255Ω, RL = 100Ω, VOUT = 1VP-P
1.3
ns
tPD
Propagation Delay
RF = RG = 255Ω, RL = 100Ω, VOUT = 1VP-P
2.5
ns
os
Small-Signal Overshoot
RF = RG = 255Ω, RL = 100Ω, VOUT = 1VP-P
10
%
tS
Settling Time
0.1%, AV = –1, RF = RG = 280Ω, RL = 150Ω
25
ns
dG
Differential Gain (Note 8)
RF = RG = 255Ω, RL = 150Ω
0.02
%
dP
Differential Phase (Note 8)
RF = RG = 255Ω, RL = 150Ω
0.04
DEG
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: This parameter is guaranteed to meet specified performance
through design and characterization. It has not been tested.
Note 3: A heat sink may be required depending on the power supply
voltage and how many amplifiers have their outputs short circuited.
The θJA specified for the DD package is with minimal PCB heat spreading
metal. Using expanded metal area on all layers of a board reduces
this value.
Note 4: The LT1395C/LT1396C/LT1397C are guaranteed functional over the
operating temperature range of –40°C to 85°C. The LT1397H is guaranteed
functional over the operating temperature range of –40°C to 125°C.
Note 5: The LT1395C/LT1396C/LT1397C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1395C/LT1396C/LT1397C are
designed, characterized and expected to meet specified performance from
–40°C and 85°C but are not tested or QA sampled at these temperatures.
The LT1397H is guaranteed to meet specified performance from –40°C to
125°C. For guaranteed I-grade parts, consult the factory.
Note 6: TJ is calculated from the ambient temperature TA and the power
dissipation PD according to the following formula:
LT1395CS5: TJ = TA + (PD • 250°C/W)
LT1396CS6: TJ = TA + (PD • 230°C/W)
LT1395CS8: TJ = TA + (PD • 150°C/W)
LT1396CS8: TJ = TA + (PD • 150°C/W)
LT1396CMS8: TJ = TA + (PD • 250°C/W)
LT1396CDD: TJ = TA + (PD • 160°C/W)
LT1397CS14: TJ = TA + (PD • 100°C/W)
LT1397CGN16: TJ = TA + (PD • 135°C/W)
LT1397CDE: TJ = TA + (PD • 43°C/W)
LT1397HDE: TJ = TA + (PD • 43°C/W)
Note 7: Slew rate is measured at ±2V on a ±3V output signal.
Note 8: Differential gain and phase are measured using a Tektronix
TSG120YC/NTSC signal generator and a Tektronix 1780R Video
Measurement Set. The resolution of this equipment is 0.1% and 0.1°.
Ten identical amplifier stages were cascaded giving an effective resolution
of 0.01% and 0.01°.
Note 9: For LT1395CS6, turn-on delay time (tON) is measured from control
input to appearance of 1V(50%) at the output, for VIN = 1V and A V = 2.
Likewise, turn-off delay time (tOFF) is measured from control input to
appearance of 1V(50%) on the output for VIN = 1V and A V = 2.
This specification is guaranteed by design and characterization.
139567fd
5
LT1395/LT1396/LT1397
TYPICAL AC PERFORMANCE
VS (V)
AV
RL (Ω)
RF (Ω)
RG (Ω)
SMALL SIGNAL
– 3dB BW (MHz)
SMALL SIGNAL
0.1dB BW (MHz)
SMALL SIGNAL
PEAKING (dB)
±5
1
100
374
–
400
100
0.1
±5
2
100
255
255
350
100
0.1
±5
–1
100
280
280
350
100
0.1
±5
3
500
221
110
300
100
0.1
±5
5
500
100
24.9
210
50
0.0
±5
10
500
90.9
10
65
10
0.0
±5
10
500
90.9
10Ω||100pF
100
50
0.1
TYPICAL PERFORMANCE CHARACTERISTICS
Closed-Loop Gain vs Frequency
(A V = 1)
Closed-Loop Gain vs Frequency
(A V = 2)
0
–2
–4
–6
GAIN (dB)
6
GAIN (dB)
4
2
1G
1M
10M
100M
FREQUENCY (Hz)
VS = ±5V
VIN = –10dBm
RF = RG = 255Ω
RL = 100Ω
1395/6/7 G01
VS = ±5V
VIN = ±2.5V
RF = 374Ω
RL = 100Ω
TIME (10ns/DIV)
1395/6/7 G04
1M
10M
100M
FREQUENCY (Hz)
VS = ±5V
VIN = –10dBm
RF = RG = 280Ω
RL = 100Ω
1G
1395/6/7 G02
Large-Signal Transient Response
(A V = 2)
OUTPUT (1V/DIV)
OUTPUT (1V/DIV)
Large-Signal Transient Response
(A V = 1)
–4
–6
0
1M
10M
100M
FREQUENCY (Hz)
VS = ±5V
VIN = –10dBm
RF = 374Ω
RL = 100Ω
–2
1G
1395/6/7 G03
Large-Signal Transient Response
(A V = – 1)
OUTPUT (1V/DIV)
GAIN (dB)
0
Closed-Loop Gain vs Frequency
(A V = – 1)
VS = ±5V
TIME (10ns/DIV)
VIN = ±1.25V
RF = RG = 255Ω
RL = 100Ω
1395/6/7 G05
VS = ±5V
TIME (10ns/DIV)
VIN = ±2.5V
RF = RG = 280Ω
RL = 100Ω
1395/6/7 G06
139567fd
6
LT1395/LT1396/LT1397
TYPICAL PERFORMANCE CHARACTERISTICS
2nd and 3rd Harmonic Distortion
vs Frequency
Maximum Undistorted Output
Voltage vs Frequency
70
70
HD2
HD3
80
90
AV = +1
5
4
2
110
100k
1M
FREQUENCY (Hz)
10M
100M
TA = 25°C
RF = 374Ω (AV = 1)
RF = RG = 255Ω (AV = 2)
RL = 100Ω
VS = ±5V
en
1
0.1
0.01
10k
1
30
10
100 300 1k 3k 10k 30k 100k
FREQUENCY (Hz)
100k
RF = RG = 255Ω
RL = 50Ω
AV = +2
VS = ±5V
OUTPUT IMPEDANCE (DISABLED) (Ω)
OUTPUT IMPEDANCE (Ω)
INPUT NOISE (nV/√Hz OR pA/√Hz)
+In
100k
1M
10M
FREQUENCY (Hz)
Maximum Capacitive Load
vs Feedback Resistor
900
1500
2100
2700
FEEDBACK RESISTANCE (Ω)
3300
1395/6/7 G13
1M
10M
FREQUENCY (Hz)
100M
1395/6/7 G12
Supply Current vs Supply Voltage
6
RF = RG = 255Ω
VS = ±5V
OVERSHOOT < 2%
30
5
SUPPLY CURRENT (mA)
RF = RG
AV = +2
VS = ±5V
PEAKING ≤ 5dB
OUTPUT SERIES RESISTANCE (Ω)
CAPACITIVE LOAD (pF)
1k
100
100k
100M
40
10
1
300
10k
Capacitive Load
vs Output Series Resistor
1000
100M
RF = 374Ω
AV = +1
VS = ±5V
1395/6/7 G11
1395/6/7 G10
100
1M
10M
FREQUENCY (Hz)
LT1395CS6 Output Impedance
(Disabled) vs Frequency
100
1000
–In
100k
1395/6/7 G09
Output Impedance vs Frequency
100
TA = 25°C
RF = RG = 255Ω
RL = 100Ω
AV = +2
1395/6/7 G08
Input Voltage Noise and Current
Noise vs Frequency
10
30
0
10k
100M
+PSRR
40
10
10M
FREQUENCY (Hz)
1M
–PSRR
50
20
1395/6/7 G07
10
60
6
3
100
AV = +2
PSRR (dB)
60
10k
80
7
OUTPUT VOLTAGE (VP-P)
DISTORTION (dB)
TA = 25°C
40 RF = RG = 255W
RL = 100Ω
50 VS = ±5V
VOUT = 2VPP
1k
PSRR vs Frequency
8
30
20
10
EN = V–
4
EN = 0V,
ALL NON-DISABLE DEVICES
3
2
1
0
0
10
100
CAPACITIVE LOAD (pF)
1000
1395/6/7 G14
0
1
2
7
3
5
6
4
SUPPLY VOLTAGE (±V)
8
9
1395/6/7 G15
139567fd
7
LT1395/LT1396/LT1397
TYPICAL PERFORMANCE CHARACTERISTICS
LT1395CS6 Enable Pin Current
vs Temperature
5
–10
3
RL = 100k
RL = 150Ω
2
1
VS = ±5V
0
–1
–2
–3
RL = 100k
RL = 150Ω
EN = 0V
–30
–40
EN = –5V
–50
–60
–70
–4
–5
–50
VS = ±5V
–20
ENABLE PIN CURRENT (μA)
OUTPUT VOLTAGE SWING (V)
4
50
25
0
75 100
–25
AMBIENT TEMPERATURE (°C)
–80
–50 –25
125
50
100
25
75
0
AMBIENT TEMPERATURE (°C)
125
5.00
VS = ±5V
EN = –5V
4.75
EN = 0V,
ALL NON-DISABLE DEVICES
4.50
4.25
4.00
3.75
3.50
3.25
3.00
–50 –25
75 100
0
50
25
AMBIENT TEMPERATURE (°C)
125
1395/6/7 G17
1395/6/7 G16
Input Offset Voltage
vs Temperature
3.0
Positive Supply Current per
Amplifier vs Temperature
POSITIVE SUPPLY CURRENT PER AMPLIFIER (mA)
Output Voltage Swing
vs Temperature
Input Bias Currents
vs Temperature
15
VS = ±5V
VS = ±5V
INPUT BIAS CURRENT (μA)
INPUT OFFSET VOLTAGE (mV)
2.5
2.0
1.5
1.0
0.5
0
12
IB+
IB–
9
6
3
–0.5
–1.0
–50 –25
0
50
75 100
25
AMBIENT TEMPERATURE (°C)
125
0
–50 –25
50
100
25
75
0
AMBIENT TEMPERATURE (°C)
1395/6/7 G19
1395/6/7 G20
Propagation Delay
Rise Time and Overshoot
INPUT (100mV/DIV)
OUTPUT (200mV/DIV)
RL = 100Ω
TIME (10ns/DIV)
RF = RG = 255Ω
f = 10MHz
OS = 10%
1395/6/7 G21
tPD = 2.5ns
AV = +2
TIME (500ps/DIV)
RL = 100Ω
RF = RG = 255Ω
1395/6/7 G22
VOUT (200mV/DIV)
OUTPUT (200mV/DIV)
Square Wave Response
125
tr = 1.3ns
AV = +2
TIME (500ps/DIV)
RL = 100Ω
RF = RG = 255Ω
1395/6/7 G23
139567fd
8
LT1395/LT1396/LT1397
PIN FUNCTIONS
LT1395CS5
LT1397CS, LT1397CDE, LT1397HDE
OUT (Pin 1): Output.
OUT A (Pin 1): A Channel Output.
V – (Pin 2): Negative Supply Voltage, Usually –5V.
– IN A (Pin 2): Inverting Input of A Channel Amplifier.
+IN (Pin 3): Noninverting Input.
+ IN A (Pin 3): Noninverting Input of A Channel Amplifier.
– IN (Pin 4): Inverting Input.
V + (Pin 4): Positive Supply Voltage, Usually 5V.
V + (Pin 5): Positive Supply Voltage, Usually 5V.
+ IN B (Pin 5): Noninverting Input of B Channel Amplifier.
– IN B (Pin 6): Inverting Input of B Channel Amplifier.
LT1395CS6
OUT (Pin 1): Output.
V – (Pin 2): Negative Supply Voltage, Usually –5V.
+ IN (Pin 3): Noninverting Input.
– IN (Pin 4): Inverting Input.
EN (Pin 5): Enable Pin. Logic low to enable.
V + (Pin 6): Positive Supply Voltage, Usually 5V.
LT1395CS8
NC (Pin 1): No Connection.
– IN (Pin 2): Inverting Input.
+ IN (Pin 3): Noninverting Input.
V – (Pin 4): Negative Supply Voltage, Usually –5V.
NC (Pin 5): No Connection.
OUT (Pin 6): Output.
V+ (Pin 7): Positive Supply Voltage, Usually 5V.
NC (Pin 8): No Connection.
OUT B (Pin 7): B Channel Output.
OUT C (Pin 8): C Channel Output.
– IN C (Pin 9): Inverting Input of C Channel Amplifier.
+IN C (Pin 10): Noninverting Input of C Channel Amplifier.
V – (Pin 11): Negative Supply Voltage, Usually –5V.
+IN D (Pin 12): Noninverting Input of D Channel Amplifier.
– IN D (Pin 13): Inverting Input of D Channel Amplifier.
OUT D (Pin 14): D Channel Output.
LT1397CGN
OUT A (Pin 1): A Channel Output.
– IN A (Pin 2): Inverting Input of A Channel Amplifier.
+ IN A (Pin 3): Noninverting Input of A Channel Amplifier.
V + (Pin 4): Positive Supply Voltage, Usually 5V.
+ IN B (Pin 5): Noninverting Input of B Channel Amplifier.
– IN B (Pin 6): Inverting Input of B Channel Amplifier.
OUT B (Pin 7): B Channel Output.
LT1396CMS8, LT1396CS8, LT1396CDD
NC (Pin 8): No Connection.
OUT A (Pin 1): A Channel Output.
NC (Pin 9): No Connection.
– IN A (Pin 2): Inverting Input of A Channel Amplifier.
OUT C (Pin 10): C Channel Output.
+ IN A (Pin 3): Noninverting Input of A Channel Amplifier.
– IN C (Pin 11): Inverting Input of C Channel Amplifier.
V – (Pin 4): Negative Supply Voltage, Usually –5V.
+IN C (Pin 12): Noninverting Input of C Channel Amplifier.
+ IN B (Pin 5): Noninverting Input of B Channel Amplifier.
V – (Pin 13): Negative Supply Voltage, Usually –5V.
– IN B (Pin 6): Inverting Input of B Channel Amplifier.
+IN D (Pin 14): Noninverting Input of D Channel Amplifier.
OUT B (Pin 7): B Channel Output.
– IN D (Pin 15): Inverting Input of D Channel Amplifier.
V + (Pin 8): Positive Supply Voltage, Usually 5V.
OUT D (Pin 16): D Channel Output.
139567fd
9
LT1395/LT1396/LT1397
APPLICATIONS INFORMATION
Feedback Resistor Selection
Slew Rate
The small-signal bandwidth of the LT1395/LT1396/LT1397
is set by the external feedback resistors and the internal junction capacitors. As a result, the bandwidth is a
function of the supply voltage, the value of the feedback
resistor, the closed-loop gain and the load resistor. The
LT1395/LT1396/LT1397 have been optimized for ± 5V
supply operation and have a –3dB bandwidth of 400MHz
at a gain of 1 and 350MHz at a gain of 2. Please refer to
the resistor selection guide in the Typical AC Performance table.
Unlike a traditional voltage feedback op amp, the slew rate
of a current feedback amplifier is not independent of the
amplifier gain configuration. In a current feedback amplifier, both the input stage and the output stage have slew
rate limitations. In the inverting mode, and for gains of 2
or more in the noninverting mode, the signal amplitude
between the input pins is small and the overall slew rate
is that of the output stage. For gains less than 2 in the
noninverting mode, the overall slew rate is limited by the
input stage.
Current feedback amplifiers require resistive feedback from
the output to the inverting input for stable operation. Take
care to minimize the stray capacitance between the output
and the inverting input. Capacitance on the inverting input
to ground will cause peaking in the frequency response
(and overshoot in the transient response).
The input slew rate of the LT1395/LT1396/LT1397 is approximately 600V/μs and is set by internal currents and
capacitances. The output slew rate is set by the value of
the feedback resistor and internal capacitance. At a gain
of 2 with 255Ω feedback and gain resistors and ± 5V
supplies, the output slew rate is typically 800V/μs. Larger
feedback resistors will reduce the slew rate as will lower
supply voltages.
Capacitive Loads
Enable/Disable
The LT1395/LT1396/LT1397 can drive many capacitive
loads directly when the proper value of feedback resistor
is used. The required value for the feedback resistor will
increase as load capacitance increases and as closedloop gain decreases. Alternatively, a small resistor (5Ω
to 35Ω) can be put in series with the output to isolate the
capacitive load from the amplifier output. This has the
advantage that the amplifier bandwidth is only reduced
when the capacitive load is present. The disadvantage is
that the gain is a function of the load resistance. See the
Typical Performance Characteristics curves.
The LT1395CS6 has a unique high impedance, zero supply current mode which is controlled by the EN pin. The
LT1395CS6 is designed to operate with CMOS logic; it
draws virtually zero current when the EN pin is high. To
activate the amplifier, its EN pin is normally pulled to a
logic low. However, supply current will vary as the voltage between the V + supply and EN is varied. As seen
in Figure 1, +IS does vary with (V+ – VEN), particularly
when the voltage difference is less than 3V. For normal
Capacitance on the Inverting Input
5.0
4.0
Power Supplies
V– = 0V
3.5
+IS (mA)
The LT1395/LT1396/LT1397 will operate from single or split
supplies from ± 2V (4V total) to ±6V (12V total). It is not
necessary to use equal value split supplies, however the
offset voltage and inverting input bias current will change.
The offset voltage changes about 2.5mV per volt of supply
mismatch. The inverting bias current will typically change
about 10μA per volt of supply mismatch.
TA = 25°C
V+ = 5V
4.5
3.0
V– = –5V
2.5
2.0
1.5
1.0
0.5
0
0
1
2
4
3
V+ – VEN (V)
5
6
7
1395/6/7 F01
Figure 1. + IS vs (V+ – VEN)
139567fd
10
LT1395/LT1396/LT1397
APPLICATIONS INFORMATION
Differential Input Signal Swing
OUTPUT
To avoid any breakdown condition on the input transistors, the differential input swing must be limited to ± 5V.
In normal operation, the differential voltage between the
input pins is small, so the ±5V limit is not an issue.
Buffered RGB to Color-Difference Matrix
EN
VS = ±5V
VIN = 1V
RF = 255Ω
RG = 255Ω
RL = 100Ω
1395/6/7 F02
Figure 2. Amplifier Enable Time, AV = 2
OUTPUT
EN
VS = ±5V
VIN = 1V
RF = 255Ω
RG = 255Ω
RL = 100Ω
1395/6/7 F03
Figure 3. Amplifier Disable Time, AV = 2
operation, it is important to keep the EN pin at least 3V
below the V+ supply. If a V + of less than 3V is desired,
and the amplifier will remain enabled at all times, then
the EN pin should be tied to the V – supply. The enable pin
current is approximately 30μA when activated. If using
CMOS open-drain logic, an external 1k pull-up resistor
is recommended to ensure that the LT1395CS6 remains
disabled in spite of any CMOS drain leakage currents.
The enable/disable times are very fast when driven from
standard 5V CMOS logic. The LT1395CS6 enables in about
30ns (50% point to 50% point) while operating on ±5V
supplies (Figure 2). Likewise, the disable time is approximately 40ns (50% point to 50% point) (Figure 3).
An LT1397 can be used to create buffered color-difference
signals from RGB inputs (Figure 4). In this application,
the R input arrives via 75Ω coax. It is routed to the noninverting input of LT1397 amplifier A1 and to a 845Ω
resistor R8. There is also an 82.5Ω termination resistor
R11, which yields a 75Ω input impedance at the R input
when considered in parallel with R8. R8 connects to
the inverting input of a second LT1397 amplifier (A2),
which also sums the weighted G and B inputs to create a
–0.5 • Y output. LT1397 amplifier A3 then takes the
–0.5 • Y output and amplifies it by a gain of –2, resulting
in the Y output. Amplifier A1 is configured in a noninverting gain of 2 with the bottom of the gain resistor R2 tied
to the Y output. The output of amplifier A1 thus results
in the color-difference output R-Y.
The B input is similar to the R input. It arrives via 75Ω
coax, and is routed to the noninverting input of LT1397
amplifier A4, and to a 2320Ω resistor R10. There is also
a 76.8Ω termination resistor R13, which yields a 75Ω
+
75Ω
SOURCES
R8
845Ω
A1
1/4 LT1397
R
R11
82.5Ω
R1
255Ω
R9
432Ω
R7
255Ω
G
R12
90.9Ω
R-Y
–
R10
2320Ω
B
R13
76.8Ω
–
A2
1/4 LT1397
+
R6
127Ω
R5
255Ω
R2
255Ω
–
A3
1/4 LT1397
Y
+
R4
255Ω
R3
255Ω
–
ALL RESISTORS 1%
VS = ±5V
A4
1/4 LT1397
B-Y
+
1395/6/7 F04
Figure 4. Buffered RGB to Color-Difference Matrix
139567fd
11
LT1395/LT1396/LT1397
APPLICATIONS INFORMATION
input impedance when considered in parallel with R10.
R10 also connects to the inverting input of amplifier A2,
adding the B contribution to the Y signal as discussed
above. Amplifier A4 is configured in a noninverting gain
of 2 configuration with the bottom of the gain resistor
R4 tied to the Y output. The output of amplifier A4 thus
results in the color-difference output B-Y.
The G input also arrives via 75Ω coax and adds its contribution to the Y signal via a 432Ω resistor R9, which is
tied to the inverting input of amplifier A2. There is also
a 90.9Ω termination resistor R12, which yields a 75Ω
termination when considered in parallel with R9. Using
superposition, it is straightforward to determine the
output of amplifier A2. Although inverted, it sums the
R, G and B signals in the standard proportions of 0.3R,
0.59G and 0.11B that are used to create the Y signal.
Amplifier A3 then inverts and amplifies the signal by 2,
resulting in the Y output.
Buffered Color-Difference to RGB Matrix
An LT1395 combined with an LT1396 can be used to create buffered RGB outputs from color-difference signals
(Figure 5). The R output is a back-terminated 75Ω signal
created using resistor R5 and amplifier A1 configured for
a gain of +4 via resistors R3 and R4. The noninverting
input of amplifier A1 is connected via 1k resistors R1
and R2 to the Y and R-Y inputs respectively, resulting
in cancellation of the Y signal at the amplifier input. The
remaining R signal is then amplified by A1.
The B output is also a back-terminated 75Ω signal created using resistor R16 and amplifier A3 configured for
a gain of +4 via resistors R14 and R15. The noninverting
input of amplifier A3 is connected via 1k resistors R12
and R13 to the Y and B-Y inputs respectively, resulting
in cancellation of the Y signal at the amplifier input. The
remaining B signal is then amplified by A3.
The G output is the most complicated of the three. It is a
weighted sum of the Y, R-Y and B-Y inputs. The Y input
is attenuated via resistors R6 and R7 such that amplifier
A2’s noninverting input sees 0.83Y. Using superposition,
we can calculate the positive gain of A2 by assuming that
R8 and R9 are grounded. This results in a gain of 2.41
and a contribution at the output of A2 of 2Y. The R-Y input
is amplified by A2 with the gain set by resistors R8 and
R10, giving an amplification of –1.02. This results in a
contribution at the output of A2 of 1.02Y – 1.02R. The B-Y
input is amplified by A2 with the gain set by resistors R9
and R10, giving an amplification of – 0.37. This results in
a contribution at the output of A2 of 0.37Y – 0.37B.
If we now sum the three contributions at the output of
A2, we get:
A2OUT = 3.40Y – 1.02R – 0.37B
It is important to remember though that Y is a weighted
sum of R, G and B such that:
Y = 0.3R + 0.59G + 0.11B
If we substitute for Y at the output of A2 we then get:
A2OUT = (1.02R – 1.02R) + 2G + (0.37B – 0.37B)
= 2G
The back-termination resistor R11 then halves the output
of A2 resulting in the G output.
R1
1k
Y
R2
1k
+
A1
1/2 LT1396
R-Y
–
R
R3
267Ω
R4
88.7Ω
R6
205Ω
+
A2
LT1395
R7
1k
R8
261Ω
R5
75Ω
–
R11
75Ω
G
R10
267Ω
R9
698Ω
B-Y
R12
1k
R13
1k
ALL RESISTORS 1%
VS = ±5V
+
A3
1/2 LT1396
–
R16
75Ω
B
R14
267Ω
R15
88.7Ω
1395/6/7 F05
Figure 5. Buffered Color-Difference to RGB Matrix
139567fd
12
LT1395/LT1396/LT1397
SIMPLIFIED SCHEMATIC
(each amplifier)
V+
–IN
+IN
OUT
EN
(LT1395CS6 ONLY)
FOR ALL
NON-DISABLE
DEVICES
V–
1395/6/7 SS
PACKAGE DESCRIPTION
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698 Rev C)
R = 0.125
TYP
5
0.40 p 0.10
8
0.70 p0.05
3.5 p0.05
1.65 p0.05
2.10 p0.05 (2 SIDES)
3.00 p0.10
(4 SIDES)
PACKAGE
OUTLINE
1.65 p 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
(DD8) DFN 0509 REV C
0.200 REF
0.25 p 0.05
0.50
BSC
2.38 p0.05
0.75 p0.05
4
0.25 p 0.05
1
0.50 BSC
2.38 p0.10
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
139567fd
13
LT1395/LT1396/LT1397
PACKAGE DESCRIPTION
DE Package
14-Lead Plastic DFN (4mm × 3mm)
(Reference LTC DWG # 05-08-1708 Rev B)
R = 0.115
TYP
4.00 p0.10
(2 SIDES)
R = 0.05
TYP
0.70 p0.05
3.60 p0.05
2.20 p0.05
8
3.30 p0.05
3.30 p0.10
3.00 p0.10
(2 SIDES)
1.70 p 0.05
0.40 p 0.10
14
1.70 p 0.10
PIN 1 NOTCH
R = 0.20 OR
0.35 s 45o
CHAMFER
PIN 1
PACKAGE
TOP MARK
OUTLINE (SEE NOTE 6)
(DE14) DFN 0806 REV B
7
0.75 p0.05
0.200 REF
0.25 p 0.05
0.50 BSC
1
0.25 p 0.05
0.50 BSC
3.00 REF
3.00 REF
0.00 – 0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WGED-3) IN JEDEC
PACKAGE OUTLINE MO-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
GN Package
16-Lead Plastic SSOP (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1641)
.189 – .196*
(4.801 – 4.978)
.045 ±.005
16 15 14 13 12 11 10 9
.254 MIN
.009
(0.229)
REF
.150 – .165
.229 – .244
(5.817 – 6.198)
.0165 ±.0015
.150 – .157**
(3.810 – 3.988)
.0250 BSC
RECOMMENDED SOLDER PAD LAYOUT
1
.015 ± .004
× 45°
(0.38 ± 0.10)
.007 – .0098
(0.178 – 0.249)
2 3
4
5 6
7
.0532 – .0688
(1.35 – 1.75)
8
.004 – .0098
(0.102 – 0.249)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. CONTROLLING DIMENSION: INCHES
INCHES
2. DIMENSIONS ARE IN
(MILLIMETERS)
3. DRAWING NOT TO SCALE
.008 – .012
(0.203 – 0.305)
TYP
.0250
(0.635)
BSC
GN16 (SSOP) 0204
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
139567fd
14
LT1395/LT1396/LT1397
PACKAGE DESCRIPTION
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev F)
0.889 p 0.127
(.035 p .005)
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
3.00 p 0.102
(.118 p .004)
(NOTE 3)
0.65
(.0256)
BSC
0.42 p 0.038
(.0165 p .0015)
TYP
8
7 6 5
0.52
(.0205)
REF
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
3.00 p 0.102
(.118 p .004)
(NOTE 4)
4.90 p 0.152
(.193 p .006)
DETAIL “A”
0o – 6o TYP
GAUGE PLANE
1
0.53 p 0.152
(.021 p .006)
DETAIL “A”
2 3
4
1.10
(.043)
MAX
0.86
(.034)
REF
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
BSC
0.1016 p 0.0508
(.004 p .002)
MSOP (MS8) 0307 REV F
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
139567fd
15
LT1395/LT1396/LT1397
PACKAGE DESCRIPTION
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1633)
0.62
MAX
0.95
REF
2.90 BSC
(NOTE 4)
1.22 REF
1.4 MIN
3.85 MAX 2.62 REF
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
1.90 BSC
S5 TSOT-23 0302 REV B
139567fd
16
LT1395/LT1396/LT1397
PACKAGE DESCRIPTION
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1634)
0.62
MAX
2.90 BSC
(NOTE 4)
0.95
REF
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
1.90 BSC
S6 TSOT-23 0302 REV B
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
139567fd
17
LT1395/LT1396/LT1397
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.050 BSC
8
.245
MIN
7
6
5
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
× 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
2
3
4
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 0303
139567fd
18
LT1395/LT1396/LT1397
PACKAGE DESCRIPTION
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.337 – .344
(8.560 – 8.738)
NOTE 3
.045 ±.005
.050 BSC
14
N
12
11
10
9
8
N
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
1
.030 ±.005
TYP
13
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
1
.010 – .020
s 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
2
3
4
5
.053 – .069
(1.346 – 1.752)
NOTE:
1. DIMENSIONS IN
.014 – .019
(0.355 – 0.483)
TYP
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
7
.004 – .010
(0.101 – 0.254)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
6
.050
(1.270)
BSC
S14 0502
139567fd
19
LT1395/LT1396/LT1397
TYPICAL APPLICATION
Single Supply RGB Video Amplifier
input. Assuming a 75Ω source impedance for the signal
driving VIN, the Thevenin equivalent signal arriving at A1’s
positive input is 3V + 0.4VIN, with a source impedance
of 714Ω. The combination of these two inputs gives an
output at the cathode of D2 of 2 • VIN with no additional
DC offset. The 75Ω back termination resistor R9 halves
the signal again such that VOUT equals a buffered version of VIN.
The LT1395 can be used with a single supply voltage of
6V or more to drive ground-referenced RGB video. In
Figure 6, two 1N4148 diodes D1 and D2 have been placed
in series with the output of the LT1395 amplifier A1 but
within the feedback loop formed by resistor R8. These
diodes effectively level-shift A1’s output downward by 2
diodes, allowing the circuit output to swing to ground.
It is important to note that the 4.7μF capacitor C1 has
been added to provide enough current to maintain the
voltage drop across diodes D1 and D2 when the circuit
output drops low enough that the diodes might otherwise turn off. This means that this circuit works fine for
continuous video input, but will require that C1 charge
up after a period of inactivity at the input.
Amplifier A1 is used in a positive gain configuration.
The feedback resistor R8 is 255Ω. The gain resistor
is created from the parallel combination of R6 and R7,
giving a Thevenin equivalent 63.5Ω connected to 3.75V.
This gives an AC gain of + 5 from the noninverting input
of amplifier A1 to the cathode of D2. However, the video
input is also attenuated before arriving at A1’s positive
5V
R1
1000Ω
R6
84.5Ω
+
A1
LT1395
R2
1300Ω
–
R3
160Ω
VIN
R4
75Ω
R5
2.32Ω
C1
4.7μF
VS
6V TO 12V
D2
D1
1N4148 1N4148
R9
75Ω
VOUT
R8
255Ω
1395/6/7 TA03
R7
255Ω
Figure 6. Single Supply RGB Video Amplifier (1 of 4 Channels)
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QFN Package
139567fd
20 Linear Technology Corporation
LT 0709 REV D • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
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