LT6233/LT6233-10
LT6234/LT6235
60MHz, Rail-to-Rail Output,
1.9nV/√Hz, 1.2mA Op Amp Family
Features
Description
Low Noise Voltage: 1.9nV/√Hz
n Low Supply Current: 1.2mA/Amp Max
n Low Offset Voltage: 350µV Max
n Gain-Bandwidth Product:
LT6233: 60MHz; AV ≥ 1
LT6233-10: 375MHz; AV ≥ 10
n Wide Supply Range: 3V to 12.6V
n Output Swings Rail-to-Rail
n Common Mode Rejection Ratio: 115dB Typ
n Output Current: 30mA
n Operating Temperature Range: –40°C to 85°C
n LT6233 Shutdown to 10µA Maximum
n LT6233/LT6233-10 in a Low Profile (1mm)
ThinSOT™ Package
n Dual LT6234 in 8-Pin SO and Tiny DFN Packages
n LT6235 in a 16-Pin SSOP Package
The LT®6233/LT6234/LT6235 are single/dual/quad low
noise, rail-to-rail output unity-gain stable op amps that
feature 1.9nV/√Hz noise voltage and draw only 1.2mA of
supply current per amplifier. These amplifiers combine
very low noise and supply current with a 60MHz gainbandwidth product, a 17V/µs slew rate and are optimized
for low supply voltage signal conditioning systems. The
LT6233-10 is a single amplifier optimized for higher gain
applications resulting in higher gain bandwidth and slew
rate. The LT6233 and LT6233-10 include an enable pin
that can be used to reduce the supply current to less
than 10µA.
n
Applications
n
n
n
n
n
Ultrasound Amplifiers
Low Noise, Low Power Signal Processing
Active Filters
Driving A/D Converters
Rail-to-Rail Buffer Amplifiers
The amplifier family has an output that swings within 50mV
of either supply rail to maximize the signal dynamic range
in low supply applications and is specified on 3.3V, 5V and
±5V supplies. The en • √ISUPPLY product of 2.1 per amplifier
is among the most noise efficient of any op amp.
The LT6233/LT6233-10 are available in the 6-lead SOT‑23
package and the LT6234 dual is available in the 8-pin SO
package with standard pinouts. For compact layouts,
the dual is also available in a tiny dual fine pitch leadless
package (DFN). The LT6235 is available in the 16-pin
SSOP package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Typical Application
Noise Voltage and Unbalanced
Noise Current vs Frequency
Low Noise Low Power Instrumentation Amplifier
6
1/2 LT6234
R6
499Ω
VS+
R2
475Ω
+
R1
49.9Ω
LT6233
R3
475Ω
1/2 LT6234
IN–
VS–
5
–
R5
499Ω
VOUT
EN
IS = 3mA
EN = 8µVRMS INPUT REFERRED,
MEASUREMENT BW = 4MHz
6
5
4
4
3
3
NOISE VOLTAGE
2
2
1
R7
VS– 499Ω
623345 TA01a
AV = 20
BW = 2.8MHz
VS = ±1.5V to ±5V
NOISE VOLTAGE (nV/√Hz)
R4
499Ω
IN+
VS = ±2.5V
TA = 25°C
VCM = 0V
1
NOISE CURRENT
0
10
100
1k
10k
FREQUENCY (Hz)
UNBALANCED NOISE CURRENT (pA/√Hz)
VS+
0
100k
623345 TA01b
623345fc
1
LT6233/LT6233-10
LT6234/LT6235
Absolute Maximum Ratings (Note 1)
Total Supply Voltage (V+ to V–)............................... 12.6V
Input Current (Note 2).......................................... ±40mA
Output Short-Circuit Duration (Note 3)............. Indefinite
Operating Temperature Range (Note 4)....–40°C to 85°C
Specified Temperature Range (Note 5).....–40°C to 85°C
Junction Temperature............................................ 150°C
Junction Temperature (DD Package)..................... 125°C
Storage Temperature Range................... –65°C to 150°C
Storage Temperature Range
(DD Package)......................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec).................... 300°C
Pin Configuration
TOP VIEW
TOP VIEW
6 V+
OUT 1
V– 2
5 ENABLE
+IN 3
4 –IN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 250°C/W
OUT A
1
–IN A
2
+IN A
3
V–
4
–
+
–
+
8
V+
7
OUT B
6
–IN B
5
+IN B
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 160°C/W
UNDERSIDE METAL CONNECTED TO V– (PCB CONNECTION OPTIONAL)
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V–
4
–
+
–
+
8
V+
7
OUT B
V
6
–IN B
+IN B 5
+IN B
–IN B 6
5
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 190°C/W
+IN A 3
+
–
+
A
15 –IN D
14 +IN D
D
4
OUT B 7
NC 8
OUT D
–
–IN A 2
OUT A 1
16
+
TOP VIEW
13 V
+
–B
+
C–
–
12 +IN C
11 –IN C
10 OUT C
9
NC
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
TJMAX = 150°C, θJA = 135°C/W
623345fc
2
LT6233/LT6233-10
LT6234/LT6235
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LT6233CS6#PBF
LT6233CS6#TRPBF
LTAFL
6-Lead Plastic TS0T-23
0°C to 70°C
LT6233IS6#PBF
LT6233IS6#TRPBF
LTAFL
6-Lead Plastic TS0T-23
–40°C to 85°C
LT6233CS6-10#PBF
LT6233CS6-10#TRPBF
LTAFM
6-Lead Plastic TS0T-23
0°C to 70°C
LT6233IS6-10#PBF
LT6233IS6-10#TRPBF
LTAFM
6-Lead Plastic TS0T-23
–40°C to 85°C
LT6234CS8#PBF
LT6234CS8#TRPBF
6234
8-Lead Plastic SO
0°C to 70°C
LT6234IS8#PBF
LT6234IS8#TRPBF
6234I
8-Lead Plastic SO
–40°C to 85°C
LT6234CDD#PBF
LT6234CDD#TRPBF
LAET
8-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LT6234IDD#PBF
LT6234IDD#TRPBF
LAET
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LT6235CGN#PBF
LT6235CGN#TRPBF
6235
16-Lead Narrow Plastic SSOP
0°C to 70°C
LT6235IGN#PBF
LT6235IGN#TRPBF
6235I
16-Lead Narrow Plastic SSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
Electrical Characteristics
TA = 25°C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply,
ENABLE = 0V, unless otherwise noted.
SYMBOL PARAMETER
VOS
IB
IOS
TYP
MAX
UNITS
100
50
75
500
350
450
µV
µV
µV
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
80
600
µV
Input Bias Current
1.5
3
µA
IB Match (Channel-to-Channel) (Note 6)
0.04
0.3
µA
Input Offset Current
0.04
0.3
µA
Input Offset Voltage
CONDITIONS
MIN
LT6233S6, LT6233S6-10
LT6234S8, LT6235GN
LT6234DD
Input Noise Voltage
0.1Hz to 10Hz
220
en
Input Noise Voltage Density
f = 10kHz, VS = 5V
1.9
nVP-P
in
Input Noise Current Density, Balanced Source
Input Noise Current Density, Unbalanced Source
f = 10kHz, VS = 5V, RS = 10k
f = 10kHz, VS = 5V, RS = 10k
0.43
0.78
Input Resistance
Common Mode
Differential Mode
22
25
MΩ
kΩ
CIN
Input Capacitance
Common Mode
Differential Mode
2.5
4.2
pF
pF
AVOL
Large-Signal Gain
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2
VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2
73
18
140
35
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2
VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2
53
11
100
20
V/mV
V/mV
3
nV/√Hz
pA/√Hz
pA/√Hz
VCM
Input Voltage Range
Guaranteed by CMRR, VS = 5V, 0V
Guaranteed by CMRR, VS = 3.3V, 0V
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = 1.5V to 4V
VS = 3.3V, VCM = 1.15V to 2.65V
90
85
115
110
dB
dB
CMRR Match (Channel-to-Channel) (Note 6)
VS = 5V, VCM = 1.5V to 4V
84
115
dB
1.5
1.15
4
2.65
V
V
623345fc
3
LT6233/LT6233-10
LT6234/LT6235
Electrical Characteristics
TA = 25°C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply,
ENABLE = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
PSRR
Power Supply Rejection Ratio
PSRR Match (Channel-to-Channel) (Note 6)
VS = 3V to 10V
90
115
dB
VS = 3V to 10V
84
115
dB
Minimum Supply Voltage (Note 7)
MAX
3
UNITS
V
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 15mA
VS = 3.3V, ISINK = 10mA
4
75
165
125
40
180
320
240
mV
mV
mV
mV
VOH
Output Voltage Swing High (Note 8)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 15mA
VS = 3.3V, ISOURCE = 10mA
5
85
220
165
50
195
410
310
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3.3V
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = V+ – 0.35V
1.05
0.2
1.2
10
mA
µA
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
–25
–75
µA
VL
ENABLE Pin Input Voltage Low
0.3
V
10
µA
VH
±40
±35
±55
±50
mA
mA
V+ – 0.35
ENABLE Pin Input Voltage High
V
Output Leakage Current
ENABLE = V+ – 0.35V, VO = 1.5V to 3.5V
0.2
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
500
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
76
µs
GBW
Gain-Bandwidth Product
Frequency = 1MHz, VS = 5V
LT6233-10
55
320
MHz
MHz
SR
Slew Rate
VS = 5V, A V = –1, RL = 1k, VO = 1.5V to 3.5V
15
V/µs
80
V/µs
10
LT6233-10, VS = 5V, AV = –10, RL = 1k,
VO = 1.5V to 3.5V
FPBW
tS
Full-Power Bandwidth
Settling Time (LT6233, LT6234, LT6235)
1.6
MHz
LT6233-10, HD2 = HD3 ≤ 1%
VS = 5V, VOUT = 3VP-P (Note 9)
1.06
2.2
MHz
0.1%, VS = 5V, VSTEP = 2V, AV = –1, RL = 1k
175
ns
623345fc
4
LT6233/LT6233-10
LT6234/LT6235
Electrical Characteristics
The l denotes the specifications which apply over the 0°C < TA < 70°C
temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6233CS6, LT6233CS6-10
LT6234CS8, LT6235CGN
LT6234CDD
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
VOS TC
IB
Input Offset Voltage Drift (Note 10)
MIN
TYP
UNIT
600
450
550
µV
µV
µV
l
800
µV
3.0
µV/°C
0.5
l
Input Bias Current
l
3.5
µA
IB Match (Channel-to-Channel) (Note 6)
l
0.4
µA
IOS
Input Offset Current
AVOL
Large-Signal Gain
VCM
VCM = Half Supply
MAX
l
l
l
Input Voltage Range
µA
l
l
47
12
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2 l
VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2 l
40
7.5
V/mV
V/mV
Guaranteed by CMRR
VS = 5V, 0V
Vs = 3.3V, 0V
l
l
1.5
1.15
VS = 5V, VCM = 1.5V to 4V
VS = 3.3V, VCM = 1.15V to 2.65V
l
l
90
85
dB
dB
l
84
dB
l
90
dB
l
84
dB
l
3
V
CMRR
Common Mode Rejection Ratio
PSRR
CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V
Power Supply Rejection Ratio
VS = 3V to 10V
PSRR Match (Channel-to-Channel) (Note 6)
0.4
l
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2
VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2
VS = 3V to 10V
Minimum Supply Voltage (Note 7)
4
2.65
V
V
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 15mA
VS = 3.3V, ISINK = 10mA
l
l
l
l
50
195
360
265
mV
mV
mV
mV
VOH
Output Voltage Swing High (Note 8)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 15mA
VS = 3.3V, ISOURCE = 10mA
l
l
l
l
60
205
435
330
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3.3V
l
l
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = V+ – 0.25V
l
l
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
l
VL
ENABLE Pin Input Voltage Low
l
VH
ENABLE Pin Input Voltage High
l
±35
±30
mA
mA
1
V+ – 0.25
1.45
mA
µA
–85
µA
0.3
V
V
Output Leakage Current
ENABLE = V+ – 0.25V, VO = 1.5V to 3.5V
l
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
l
500
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
l
120
µs
SR
Slew Rate
VS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V
l
FPBW
Full-Power Bandwidth (Note 9)
VS = 5V, VOUT = 3VP-P; LT6233C, LT6234C,
LT6235C
9
LT6233-10, AV = –10, RL = 1k, VO = 1.5V to 3.5V l
l
V/µs
75
955
V/µs
kHz
623345fc
5
LT6233/LT6233-10
LT6234/LT6235
Electrical Characteristics
The l denotes the specifications which apply over the –40°C < TA < 85°C
temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
VOS
Input Offset Voltage
LT6233IS6, LT6233IS6-10
LT6234IS8, LT6235IGN
LT6234IDD
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
VOS TC
Input Offset Voltage Drift (Note 10)
IB
Input Bias Current
VCM = Half Supply
MAX
UNITS
l
l
l
700
550
650
µV
µV
µV
l
1000
µV
3
µV/°C
l
4
µA
0.4
µA
0.5
µA
IB Match (Channel-to-Channel) (Note 6)
IOS
Input Offset Current
l
AVOL
Large-Signal Gain
CMRR
Input Voltage Range
Common Mode Rejection Ratio
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2
VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2
l
l
45
11
V/mV
V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2
VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2
l
l
38
7
V/mV
V/mV
Guaranteed by CMRR
VS = 5V, 0V
VS = 3.3V, 0V
l
l
1.5
1.15
VS = 5V, VCM = 1.5V to 4V
VS = 3.3V, VCM = 1.15V to 2.65V
l
l
90
85
dB
dB
CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V
PSRR
0.5
l
l
VCM
TYP
4
2.65
V
V
l
84
dB
Power Supply Rejection Ratio
VS = 3V to 10V
l
90
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = 3V to 10V
l
84
dB
l
3
Minimum Supply Voltage (Note 7)
V
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
VS = 5V, ISINK = 15mA
VS = 3.3V, ISINK = 10mA
l
l
l
l
50
195
370
275
mV
mV
mV
mV
VOH
Output Voltage Swing High (Note 6)
No Load
ISOURCE = 5mA
VS = 5V, ISOURCE = 15mA
VS = 3.3V, ISOURCE = 10mA
l
l
l
l
60
210
445
335
mV
mV
mV
mV
ISC
Short-Circuit Current
VS = 5V
VS = 3.3V
l
l
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = V+ – 0.2V
l
l
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
VL
ENABLE Pin Input Voltage Low
VH
tON
ENABLE Pin Input Voltage High
mA
µA
l
–100
µA
l
0.3
V
l
Output Leakage Current
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
l
1
V+ – 0.2
1
µA
500
ns
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
l
SR
Slew Rate
VS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V
l
135
8
LT6233-10, AV = –10, RL = 1k, VO = 1.5V to 3.5V l
Full-Power Bandwidth (Note 9)
VS = 5V, VOUT = 3VP-P; LT6233I, LT6234I,
LT6235I
V
l
tOFF
FPBW
mA
mA
1.5
ENABLE = V+ – 0.2V, V
O = 1.5V to 3.5V
±30
±20
l
70
848
µs
V/µs
V/µs
kHz
623345fc
6
LT6233/LT6233-10
LT6234/LT6235
Electrical Characteristics
TA = 25°C, VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6233S6, LT6233S6-10
LT6234S8, LT6235GN
LT6234DD
IB
IOS
MIN
TYP
MAX
UNITS
100
50
75
500
350
450
µV
µV
µV
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
100
600
µV
Input Bias Current
1.5
3
µA
IB Match (Channel-to-Channel) (Note 6)
0.04
0.3
µA
Input Offset Current
0.04
0.3
µA
3.0
nV/√Hz
Input Noise Voltage
0.1Hz to 10Hz
220
en
Input Noise Voltage Density
f = 10kHz
1.9
in
Input Noise Current Density, Balanced Source
Input Noise Current Density, Unbalanced Source
f = 10kHz, RS = 10k
f = 10kHz, RS = 10k
0.43
0.78
Input Resistance
Common Mode
Differential Mode
22
25
MΩ
kΩ
CIN
Input Capacitance
Common Mode
Differential Mode
2.1
3.7
pF
pF
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k
VO = ±4.5V, RL = 1k
180
55
V/mV
V/mV
VCM
Input Voltage Range
Guaranteed by CMRR
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
90
110
dB
97
28
nVP-P
pA/√Hz
pA/√Hz
4
V
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
84
120
dB
PSRR
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
90
115
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
84
115
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
ISINK = 15mA
4
75
165
40
180
320
mV
mV
mV
VOH
Output Voltage Swing High (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 15mA
5
85
220
50
195
410
mV
mV
mV
ISC
Short-Circuit Current
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
IENABLE
ENABLE Pin Current
VL
ENABLE Pin Input Voltage Low
VH
ENABLE Pin Input Voltage High
tON
±40
dB
±55
mA
ENABLE = 4.65V
1.15
0.2
1.4
10
mA
µA
ENABLE = 0.3V
–35
–85
µA
0.3
4.65
V
V
Output Leakage Current
ENABLE = 4.65V, VO = ±1V
0.2
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
900
10
µA
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
100
µs
GBW
Gain-Bandwidth Product
Frequency = 1MHz
LT6233-10
42
260
60
375
MHz
MHz
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
12
17
V/µs
FPBW
Full-Power Bandwidth
VOUT = 3VP-P (Note 9)
tS
Settling Time (LT6233, LT6234, LT6235)
LT6233-10, AV = –10, RL = 1k, VO = –2V to 2V
115
V/µs
1.8
MHz
LT6233-10, HD2 = HD3 ≤ 1%
2.2
MHz
0.1%, VSTEP = 2V, AV = –1, RL = 1k
170
ns
1.27
623345fc
7
LT6233/LT6233-10
LT6234/LT6235
Electrical Characteristics
The l denotes the specifications which apply over the 0°C < TA < 70°C
temperature range. VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6233CS6, LT6233CS6-10
LT6234CS8, LT6235CGN
LT6234CDD
MIN
TYP
MAX
UNITS
l
l
l
600
450
550
µV
µV
µV
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
l
800
µV
VOS TC
Input Offset Voltage Drift (Note 10)
l
IB
Input Bias Current
l
3.5
µA
IB Match (Channel-to-Channel) (Note 6)
l
0.4
µA
IOS
Input Offset Current
l
0.4
µA
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k
VO = ±4.5V, RL = 1k
l
l
75
22
VCM
Input Voltage Range
Guaranteed by CMRR
l
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
l
90
dB
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
l
84
dB
PSRR
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
l
90
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
l
84
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
ISINK = 15mA
l
l
l
50
195
360
mV
mV
mV
VOH
Output Voltage Swing High (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 15mA
l
l
l
60
205
435
mV
mV
mV
ISC
Short-Circuit Current
l
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = 4.75V
l
l
1.7
mA
µA
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
l
–95
µA
VL
ENABLE Pin Input Voltage Low
l
0.3
V
VH
ENABLE Pin Input Voltage High
l
0.5
3
µV/°C
V/mV
V/mV
4
V
dB
±35
mA
1
4.75
V
Output Leakage Current
ENABLE = 4.75V, VO = ±1V
l
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
l
900
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
l
150
µs
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
l
LT6233-10, AV = –10, RL = 1k, VO = –2V to 2V
l
VOUT = 3VP-P ; LT6233C, LT6234C, LT6235C
l
FPBW
Full-Power Bandwidth (Note 9)
11
V/µs
105
1.16
V/µs
MHz
623345fc
8
LT6233/LT6233-10
LT6234/LT6235
Electrical Characteristics
The l denotes the specifications which apply over the –40°C < TA < 85°C
temperature range. VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
VOS
Input Offset Voltage
LT6233IS6, LT6233IS6-10
LT6234IS8, LT6235IGN
LT6234IDD
TYP
MAX
UNITS
l
l
l
700
550
650
µV
µV
µV
Input Offset Voltage Match
(Channel-to-Channel) (Note 6)
l
1000
µV
VOS TC
Input Offset Voltage Drift (Note 10)
l
3
µV/°C
IB
Input Bias Current
l
4
µA
0.5
IB Match (Channel-to-Channel) (Note 6)
l
0.4
µA
IOS
Input Offset Current
l
0.5
µA
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k
VO = ±4.5V, RL = 1k
l
l
68
20
VCM
Input Voltage Range
Guaranteed by CMRR
l
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
l
90
dB
CMRR Match (Channel-to-Channel) (Note 6) VCM = –3V to 4V
l
84
dB
dB
PSRR
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
l
90
84
V/mV
V/mV
4
V
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
l
VOL
Output Voltage Swing Low (Note 8)
No Load
ISINK = 5mA
ISINK = 15mA
l
l
l
50
195
370
mV
mV
mV
dB
VOH
Output Voltage Swing High (Note 8)
No Load
ISOURCE = 5mA
ISOURCE = 15mA
l
l
l
70
210
445
mV
mV
mV
ISC
Short-Circuit Current
l
IS
Supply Current per Amplifier
Disabled Supply Current per Amplifier
ENABLE = 4.8V
l
l
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
l
VL
ENABLE Pin Input Voltage Low
l
VH
ENABLE Pin Input Voltage High
l
±30
mA
1
4.8
1.75
mA
µA
–110
µA
0.3
V
V
Output Leakage Current
ENABLE = 4.8V, VO = ±1V
l
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
l
900
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
l
160
µs
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
l
LT6233-10, AV = –10, RL = 1k, VO = –2V to 2V
l
VOUT = 3VP-P; LT6233I, LT6234I, LT6235I
l
FPBW
Full-Power Bandwidth (Note 9)
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: Inputs are protected by back-to-back diodes. If the differential
input voltage exceeds 0.7V, the input current must be limited to less than
40mA.
Note 3: A heat sink may be required to keep the junction temperature
below the absolute maximum rating when the output is shorted
indefinitely.
Note 4: The LT6233C/LT6233I the LT6234C/LT6234I, and LT6235C/LT6235I
are guaranteed functional over the temperature range of –40°C to 85°C.
10
V/µs
95
1.06
V/µs
MHz
Note 5: The LT6233C/LT6234C/LT6235C are guaranteed to meet specified
performance from 0°C to 70°C. The LT6233C/LT6234C/LT6235C are
designed, characterized and expected to meet specified performance from
–40°C to 85°C, but are not tested or QA sampled at these temperatures.
The LT6233I/LT6234I/LT6235I are guaranteed to meet specified
performance from –40°C to 85°C.
Note 6: Matching parameters are the difference between the two amplifiers
A and D and between B and C of the LT6235; between the two amplifiers
of the LT6234. CMRR and PSRR match are defined as follows: CMRR and
PSRR are measured in µV/V on the matched amplifiers. The difference is
calculated between the matching sides in µV/V. The result is converted to
dB.
623345fc
9
LT6233/LT6233-10
LT6234/LT6235
Electrical Characteristics
Note 7: Minimum supply voltage is guaranteed by power supply rejection
ratio test.
Note 8: Output voltage swings are measured between the output and
power supply rails.
Note 9: Full-power bandwidth is calculated from the slew rate:
FPBW = SR/2πVP
Note 10: This parameter is not 100% tested.
Typical Performance Characteristics
(LT6233/LT6234/LT6235)
Supply Current vs Supply Voltage
(Per Amplifier)
VOS Distribution
2.0
60
VS = 5V, 0V
VCM = V+/2
50 S8
500
400
40
30
20
VS = 5V, 0V
300
TA = 125°C
1.5
OFFSET VOLTAGE (µV)
SUPPLY CURRENT (mA)
NUMBER OF UNITS
Offset Voltage vs Input Common
Mode Voltage
TA = 25°C
1.0
TA = –55°C
0.5
200
100
0
–100
TA = –55°C
–200
–300
10
TA = 25°C
–400
0
50 100 150 200
–200 –150 –100 –50 0
INPUT OFFSET VOLTAGE (µV)
0
2
0
10
12
8
6
TOTAL SUPPLY VOLTAGE (V)
4
Input Bias Current
vs Common Mode Voltage
TA = –55°C
TA = 125°C
1
TA = 25°C
0
4
3
2
VCM = 4V
1
VCM = 1.5V
0
–1
–2
10
VS = 5V, 0V
5
INPUT BIAS CURRENT (µA)
INPUT BIAS CURRENT (µA)
5
2
–1
0
4
5
3
2
COMMON MODE VOLTAGE (V)
1
Output Saturation Voltage
vs Load Current (Output Low)
OUTPUT SATURATION VOLTAGE (V)
6
VS = 5V, 0V
3
623345 GO3
Input Bias Current vs Temperature
4
6
623345 GO4
TA = 125°C
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
INPUT COMMON MODE VOLTAGE (V)
623345 GO2
623345 GO1
6
–500
14
–1
–50
–25
0
50
75
25
TEMPERATURE (°C)
100
125
623345 GO5
VS = 5V, 0V
1
TA = 125°C
0.1
TA = –55°C
0.01
TA = 25°C
0.001
0.0001
0.01
10
0.1 1
LOAD CURRENT (mA)
100
623345 GO6
623345fc
10
LT6233/LT6233-10
LT6234/LT6235
Typical Performance Characteristics
(LT6233/LT6234/LT6235)
Output Saturation Voltage
vs Load Current (Output High)
1.0
80
VCM = VS/2
0.8
0.6
1
TA = 125°C
0.1
TA = –55°C
0.01
0.01
0.4
0.2
0
–0.2
TA = –55°C
–0.4
–0.6
TA = 25°C
0.001
TA = 25°C
–0.8
0.1 1
10
LOAD CURRENT (mA)
–1.0
100
TA = 125°C
2.0
–20
RL = 100Ω
–1.0
0.5
RL = 1k
0
RL = 100Ω
–0.5
–1.0
–0.5
Offset Voltage vs Output Current
40
0
–0.5
–1.0
–1.5
–2.0
–90
TA = –55°C
TA = 25°C
–60
–30
0
30
60
90
OUTPUT CURRENT (mA)
623345 G13
4
100
TA = 25°C
35
VS = ±5V
30
25
VS = ±2.5V
20
15
5
Total Noise vs Total Source
Resistance
TOTAL NOISE (nV/√Hz)
CHANGE IN OFFSET VOLTAGE (µV)
0.5
–5 –4 –3 –2 –1 0 1 2 3
OUTPUT VOLTAGE (V)
623345 G12
Warm-Up Drift vs Time
VS = ±5V
1.0
–2.5
623345 G11
623345 G10
TA = 125°C
RL = 100Ω
–1.0
–2.0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
OUTPUT VOLTAGE (V)
RL = 1k
0
–2.5
1.5
VS = ±5V
TA = 25°C
0.5
–2.5
3.0
5.0
1.0
–1.5
2.0
2.5
3.0 3.5 4.0 4.5
POWER SUPPLY VOLTAGE (±V)
2.0
1.5
1.0
–2.0
2.5
TA = 25°C
2.0
–1.5
1.0
1.5
2.0
OUTPUT VOLTAGE (V)
TA = –55°C
–60
–2.0
0.5
TA = 125°C
–40
–1.5
0
SOURCING
Open-Loop Gain
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
RL = 1k
–0.5
0
2.5
1.5
0
TA = 25°C
623345 GO9
VS = 5V, 0V
TA = 25°C
2.0
1.5
1.0
TA = 125°C
SINKING
20
Open-Loop Gain
2.5
VS = 3V, 0V
TA = 25°C
0.5
40
623345 G08
Open-Loop Gain
2.5
TA = –55°C
60
–80
1.5
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
TOTAL SUPPLY VOLTAGE (V)
623345 G07
OFFSET VOLTAGE (mV)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
VS = 5V, 0V
OFFSET VOLTAGE (mV)
OUTPUT SATURATION VOLTAGE (V)
10
Output Short-Circuit Current
vs Power Supply Voltage
Minimum Supply Voltage
VS = ±1.5V
VS = ±2.5V
VCM = 0V
f = 100kHz
UNBALANCED
SOURCE
10 RESISTORS
TOTAL NOISE
RESISTOR NOISE
AMPLIFIER NOISE VOLTAGE
1
10
0
0
10
30
40
20
TIME AFTER POWER-UP (s)
50
623345 G14
0.1
10
100
1k
10k
TOTAL SOURCE RESISTANCE (Ω)
100k
623345 G15
623345fc
11
LT6233/LT6233-10
LT6234/LT6235
Typical Performance Characteristics
(LT6233/LT6234/LT6235)
Noise Voltage and Unbalanced
Noise Current vs Frequency
4
3
3
NOISE VOLTAGE
2
1
1
NOISE CURRENT
0
100
10
100nV
–100nV
623345 G16
GAIN (dB)
60
VS = ±5V
40
30
20
20
0
VS = 3V, 0V
10
0
VS = ±5V
–20
–40
GAIN
–10
–20
100k
1M
PHASE (DEG)
VS = 3V, 0V
40
10M
100M
FREQUENCY (Hz)
1G
PHASE MARGIN
22
GAIN BANDWIDTH
50
40
–80
30
2
0
10
12
8
6
TOTAL SUPPLY VOLTAGE (V)
4
AV = 2
AV = 1
1
1M
10M
FREQUENCY (Hz)
100M
623345 G22
16
VS = ±2.5V RISING
10
–55 –35 –15
14
VS = ±5V FALLING
VS = ±2.5V FALLING
14
5 25 45 65 85 105 125
TEMPERATURE (°C)
623345 G21
Common Mode Rejection Ratio
vs Frequency
Channel Separation vs Frequency
–40
100
80
60
40
20
125
18
12
CHANNEL SEPARATION (dB)
AV = 10
20
VS = ±5V RISING
623345 G20
COMMON MODE REJECTION RATIO (dB)
OUTPUT IMPEDANCE (Ω)
60
60
–60
VS = 5V, 0V
0.1
100k
AV = –1
24 RF = RG = 1k
120
10
95
26
70
40
Output Impedance vs Frequency
100
65
35
5
TEMPERATURE (°C)
Slew Rate vs Temperature
50
70
623345 G19
1k
–25
623345 G18
PHASE MARGIN (DEG)
50
VS = 3V, 0V
80
TA = 25°C
CL = 5pF
RL = 1k
GAIN BANDWIDTH (MHz)
CL = 5pF
RL = 1k
100
VCM = VS/2
80
PHASE
60
40
GAIN BANDWIDTH
VS = ±5V
60
Gain Bandwidth and Phase Margin
vs Supply Voltage
120
70
CL = 5pF
80 RL = 1k
VCM = VS/2
70
50
PHASE MARGIN
623345 G17
Open-Loop Gain vs Frequency
80
90
40
–55
5s/DIV
60
VS = 3V, 0V
50
0
100k
1k
10k
FREQUENCY (Hz)
VS = ±5V
SLEW RATE (V/µs)
2
70
VS = ±2.5V
PHASE MARGIN (DEG)
4
Gain Bandwidth and Phase Margin
vs Temperature
GAIN BANDWIDTH (MHz)
5
UNBALANCED NOISE CURRENT (pA/√Hz)
5
NOISE VOLTAGE (nV/√Hz)
6
VS = ±2.5V
TA = 25°C
VCM = 0V
100nV/DIV
6
0.1Hz to 10Hz Output Voltage
Noise
100k
–70
–80
–90
–100
–110
–120
–130
VS = 5V, 0V
VCM = VS/2
0
10k
AV = 1
–50 TA = 25°C
VS = ±5V
–60
1M
10M
FREQUENCY (Hz)
100M
1G
623345 G23
–140
100k
1M
10M
FREQUENCY (Hz)
100M
623345 G24
623345fc
12
LT6233/LT6233-10
LT6234/LT6235
Typical Performance Characteristics
(LT6233/LT6234/LT6235)
Power Supply Rejection Ratio
vs Frequency
80
POSITIVE SUPPLY
60
40
NEGATIVE SUPPLY
50
VS = 5V, 0V
45 AV = 1
VS = 5V, 0V
45 AV = 2
RS = 10Ω
40
35
RS = 20Ω
30
25
20
RS = 50Ω
RL = 50Ω
15
10
20
35
25
15
1M
100k
FREQUENCY (Hz)
10M
100M
5
100
CAPACITIVE LOAD (pF)
10
Settling Time vs Output Step
(Noninverting)
400
350
–
+
VIN
250
500Ω
200
1mV
10mV
150
1mV
300
SETTLING TIME (ns)
SETTLING TIME (ns)
VOUT
10mV
–
VOUT
+
250
200
1mV
1mV
10mV
150
100
50
500Ω
VIN
10mV
100
–3
–4
–2
–1
1
2
0
OUTPUT STEP (V)
3
50
4
–3
–4
–2
–1
1
2
0
OUTPUT STEP (V)
623345 G28
Distortion vs Frequency
RL = 100Ω, 3RD
–80
–90
–100
10k
RL = 1k, 2ND
100k
1M
FREQUENCY (Hz)
–60
–70
RL = 100Ω, 2ND
RL = 100Ω, 3RD
7
6
5
4
V = ±5V
3 T S = 25°C
A
HD2, HD3 < –40dBc
2
100k
1M
10k
FREQUENCY (Hz)
623345 G31
10M
Distortion vs Frequency
–30
VS = ±2.5V
A =2
–40 VV = 2V
P-P
OUT
RL = 1k, 3RD
–80
–90
10M
AV = –1
8
623345 G30
VS = ±5V
AV = 1
–50 VOUT = 2VP-P
RL = 1k, 3RD
AV = 2
9
Distortion vs Frequency
DISTORTION (dBc)
–70
4
–40
VS = ±2.5V
AV = 1
–50 VOUT = 2VP-P
–60 RL = 100Ω, 2ND
3
10
623345 G29
–40
DISTORTION (dBc)
Maximum Undistorted Output
Signal vs Frequency
VS = ±5V
TA = 25°C
AV = –1
500Ω
–100
10k
1000
623345 G27
Settling Time vs Output Step
(Inverting)
400
300
100
CAPACITIVE LOAD (pF)
10
623345 G26
623345 G25
VS = ±5V
TA = 25°C
350 AV = 1
0
1000
OUTPUT VOLTAGE SWING (VP-P)
10k
RS = 50Ω
RL = 50Ω
20
10
RL = 1k, 2ND
DISTORTION (dBc)
1k
0
RS = 20Ω
30
5
0
RS = 10Ω
40
OVERSHOOT (%)
100
Series Output Resistance and
Overshoot vs Capacitive Load
50
VS = 5V, 0V
TA = 25°C
VCM = VS/2
OVERSHOOT (%)
POWER SUPPLY REJECTION RATIO (dB)
120
Series Output Resistance and
Overshoot vs Capacitive Load
–50
–60
RL = 1k, 3RD
RL = 100Ω, 2ND
RL = 100Ω, 3RD
–70
–80
RL = 1k, 2ND
–90
100k
1M
FREQUENCY (Hz)
10M
623345 G32
–100
10k
100k
1M
FREQUENCY (Hz)
10M
623345 G33
623345fc
13
LT6233/LT6233-10
LT6234/LT6235
Typical Performance Characteristics
(LT6233/LT6234/LT6235)
Distortion vs Frequency
Large-Signal Response
Small-Signal Response
–30
RL = 1k, 3RD
2V
–60
RL = 100Ω, 2ND
RL = 100Ω, 3RD
–70
50mV/DIV
–50
1V/DIV
DISTORTION (dBc)
VS = ±5V
A =2
–40 VV = 2V
P-P
OUT
0V
0V
–2V
–80
RL = 1k, 2ND
–90
–100
10k
100k
1M
FREQUENCY (Hz)
10M
623345 G35
200ns/DIV
VS = ±2.5V
AV = –1
RL = 1k
VS = ±2.5V
AV = 1
RL = 1k
200ns/DIV
623345 G36
623345 G34
Large-Signal Response
Output Overdrive Recovery
–5V
0V
0V
623345 G37
200ns/DIV
VS = ±5V
AV = 1
RL = 1k
VIN
1V/DIV
0V
VOUT
2V/DIV
2V/DIV
5V
VS = ±2.5V
AV = 3
200ns/DIV
623345 G38
(LT6233) ENABLE Characteristics
Supply Current
vs ENABLE Pin Voltage
1.0
TA = –55°C
0.8
30
ENABLE PIN CURRENT (µA)
SUPPLY CURRENT (mA)
TA = 25°C
0.6
0.4
25
TA = –55°C
ENABLE Pin Response Time
VS = ±2.5V
AV = 1
ENABLE
TA = 125°C
1.2
TA = 25°C
VS = ±2.5V
–2.0
0
1.0
–1.0
PIN VOLTAGE (V)
2.0
623345 G39
5V
0V
20
15
TA = 125°C
10
5
0.2
0
35
VOUT
1.4
ENABLE Pin Current
vs ENABLE Pin Voltage
0
–2.0
0
1.0
–1.0
PIN VOLTAGE (V)
2.0
0.5V
0V
VS = ±2.5V
VIN = 0.5V
AV = 1
RL = 1k
200µs/DIV
623345 G41
623345 G40
623345fc
14
LT6233/LT6233-10
LT6234/LT6235
Typical Performance Characteristics
(LT6233-10)
Gain Bandwidth and Phase Margin
vs Temperature
200
GAIN BANDWIDTH (MHz)
GAIN BANDWIDTH
300
VS = 3V, 0V
250
200
VS = ±5V
70
PHASE MARGIN
75
50
25
TEMPERATURE (°C)
80
VS = ±2.5V RISING
60
40
50
20
60
VS = 3V, 0V 40
20
VS = 3V, 0V
20
10
0
–20
VS = ±5V
0
–40
–10
TA = 25°C
AV = 10
375 CL = 5pF
RL = 1k
1M
10M
100M
FREQUENCY (Hz)
1G
GAIN BANDWIDTH
225
100
PHASE MARGIN
50
–80
0
2
4
8
10
6
TOTAL SUPPLY VOLTAGE (V)
623345 G45
60
40
20
100k
1M
10M
FREQUENCY (Hz)
100M
200
150
100
50
0
0
0
1G
623345 G48
1000
400
800
600
TOTAL RESISTOR LOAD (Ω)
(INCLUDES FEEDBACK R) 623345 G47
200
2nd and 3rd Harmonic Distortion
vs Frequency
10
–30
8
VS = ±2.5V
A = 10
–40 VV = 2V
P-P
OUT
7
–50
9
OUTPUT VOLTAGE SWING (VP-P)
COMMON MODE REJECTION RATIO (dB)
80
0
10k
250
Maximum Undistorted Output
vs Frequency
VS = 5V, 0V
VCM = VS/2
100
12
300
623345 G46
Common Mode Rejection Ratio
vs Frequency
120
ASV = ±5V
10
V
TA = 25°C
RF = 1k
RG = 100Ω
350
300
6
5
4
3
2 VS = ±5V
TA = 25°C
1 AV = 10
HD2, HD3 ≤ 40dBc
0
100k
1M
10k
FREQUENCY (Hz)
10000
Gain Bandwidth vs Resistor Load
400
–60
–20
100k
100
1000
CAPACITIVE LOAD (pF)
10
623345 G44
DISTORTION (dBc)
GAIN (dB)
30
AV = 10
CL = 5pF
100
RL = 1k
VCM = VS/2 80
PHASE (DEG)
GAIN
40
0
5 25 45 65 85 105 125
TEMPERATURE (°C)
PHASE MARGIN (DEG)
VS = ±5V
50
20
450
GAIN BANDWIDTH (MHz)
60
RS = 50Ω
Gain Bandwidth and Phase Margin
vs Supply Voltage
120
PHASE
30
623345 G43
Open-Loop Gain and Phase
vs Frequency
70
RS = 20Ω
40
10
623345 G42
80
RS = 10Ω
50
VS = ±2.5V FALLING
0
–55 –35 –15
125
VS = 5V, 0V
AV = 10
60
VS = ±5V FALLING
100
40
100
0
70
120
60
VS = 3V, 0V
–50 –25
PHASE MARGIN (DEG)
350
AV = –10
180 RF = 1k
RG = 100Ω
160
VS = ±5V RISING
140
OVERSHOOT (%)
VS = ±5V
GAIN BANDWIDTH (MHz)
AV = 10
400
SLEW RATE (V/µs)
450
Series Output Resistor and
Overshoot vs Capacitive Load
Slew Rate vs Temperature
RL = 100Ω, 3RD
–60
RL = 1k, 3RD
RL = 100Ω, 2ND
RL = 1k, 2ND
–70
–80
–90
10M
623345 G49
–100
10k
100k
1M
FREQUENCY (Hz)
10M
623345 G50
623345fc
15
LT6233/LT6233-10
LT6234/LT6235
Typical Performance Characteristics
(LT6233-10)
2nd and 3rd Harmonic Distortion
vs Frequency
Large-Signal Response
Output-Overload Recovery
–30
RL = 100Ω, 2ND
–60
0V
0V
0V
RL = 1k, 3RD
–70
–80
–90
–100
10k
VOUT
2V/DIV
RL = 1k, 2ND
RL = 100Ω, 3RD
VIN
0.5V/DIV
–50
VOUT
2V/DIV
DISTORTION (dBc)
VS = ±5V
A = 10
–40 VV = 2V
P-P
OUT
100k
1M
FREQUENCY (Hz)
10M
VS = ±5V
AV = 10
RF = 900Ω
RG = 100Ω
623345 G52
100ns/DIV
VS = 5V, 0V
AV = 10
RF = 900Ω
RG = 100Ω
100ns/DIV
623345 G53
623345 G51
Input Referred High Frequency
Noise Spectrum
Small-Signal Response
1nV/√Hz/DIV
VOUT
100mV/DIV
10
2.5V
VS = 5V, 0V
AV = 10
RF = 900Ω
RG = 100Ω
100ns/DIV
623345 G54
0
100kHz
2MHz/DIV
20MHz
623345 G55
623345fc
16
LT6233/LT6233-10
LT6234/LT6235
Applications Information
Figure 1 is a simplified schematic of the LT6233/LT6234/
LT6235, which has a pair of low noise input transistors
Q1 and Q2. A simple current mirror Q3/Q4 converts the
differential signal to a single-ended output, and these
transistors are degenerated to reduce their contribution
to the overall noise.
Capacitor C1 reduces the unity-cross frequency and improves the frequency stability without degrading the gain
bandwidth of the amplifier. Capacitor CM sets the overall
amplifier gain bandwidth. The differential drive generator
supplies current to transistors Q5 and Q6 that swing the
output from rail-to-rail.
Input Protection
There are back-to-back diodes, D1 and D2 across the + and
– inputs of these amplifiers to limit the differential input
voltage to ±0.7V. The inputs of the LT6233/LT6234/LT6235
do not have internal resistors in series with the input transistors. This technique is often used to protect the input
devices from overvoltage that causes excessive current
to flow. The addition of these resistors would significantly
degrade the low noise voltage of these amplifiers. For
instance, a 100Ω resistor in series with each input would
generate 1.8nV/√Hz of noise, and the total amplifier noise
voltage would rise from 1.9nV/√Hz to 2.6nV/√Hz. Once
the input differential voltage exceeds ±0.7V, steady-state
current conducted through the protection diodes should
be limited to ±40mA. This implies 25Ω of protection resistance is necessary per volt of overdrive beyond ±0.7V.
These input diodes are rugged enough to handle transient
currents due to amplifier slew rate overdrive and clipping
without protection resistors.
The photo of Figure 2 shows the output response to an
input overdrive with the amplifier connected as a voltage
follower. With the input signal low, current source I1 saturates and the differential drive generator drives Q6 into
saturation so the output voltage swings all the way to V–.
The input can swing positive until transistor Q2 saturates
into current mirror Q3/Q4. When saturation occurs, the
output tries to phase invert, but diode D2 conducts current
from the signal source to the output through the feedback
connection. The output is clamped a diode drop below the
input. In this photo, the input signal generator is limiting
at about 20mA.
2.5V
1V/DIV
Amplifier Characteristics
0V
–2.5V
500µs/DIV
623345 F02
Figure 2. VS = ±2.5V, AV = 1 with Large Overdrive
+V
Q3
–V
+V
DESD1
Q4
C1
DESD2
Q1
D1
DESD5
VOUT
DESD6
DIFFERENTIAL
DRIVE GENERATOR
–V
–VIN
Q5
CM
+V
–V
Q2
Q6
D2
+V
+VIN
DESD3
DESD4
–V
I1
BIAS
ENABLE
+V
–V
623345 F01
Figure 1. Simplified Schematic
623345fc
17
LT6233/LT6233-10
LT6234/LT6235
Applications Information
With the amplifier connected in a gain of AV ≥ 2, the output
can invert with very heavy overdrive. To avoid this inversion, limit the input overdrive to 0.5V beyond the power
supply rails.
ESD
The LT6233/LT6234/LT6235 have reverse-biased ESD
protection diodes on all inputs and outputs as shown in
Figure 1. If these pins are forced beyond either supply,
unlimited current will flow through these diodes. If the
current is transient and limited to one hundred milliamps
or less, no damage to the device will occur.
Noise
The noise voltage of the LT6233/LT6234/LT6235 is
equivalent to that of a 225Ω resistor, and for the lowest
possible noise it is desirable to keep the source and feedback resistance at or below this value, i.e., RS + RG||RFB
≤ 225Ω. With RS + RG||RFB = 225Ω the total noise of the
amplifier is:
eN = √(1.9nV)2 + (1.9nV)2 = 2.69nV/√Hz
Below this resistance value, the amplifier dominates the
noise, but in the region between 225Ω and about 30k,
the noise is dominated by the resistor thermal noise. As
the total resistance is further increased beyond 30k, the
amplifier noise current multiplied by the total resistance
eventually dominates the noise.
The product of eN • √ISUPPLY is an interesting way to
gauge low noise amplifiers. Most low noise amplifiers
with low eN have high ISUPPLY current. In applications that
require low noise voltage with the lowest possible supply
current, this product can prove to be enlightening. The
LT6233/LT6234/LT6235 have an eN • √ISUPPLY product of
only 2.1 per amplifier, yet it is common to see amplifiers
with similar noise specifications to have eN • √ISUPPLY as
high as 13.5.
For a complete discussion of amplifier noise, see the
LT1028 data sheet.
Enable Pin
The LT6233 and LT6233-10 include an ENABLE pin that
shuts down the amplifier to 10µA maximum supply current. The ENABLE pin must be driven low to operate the
amplifier with normal supply current. The ENABLE pin
must be driven high to within 0.35V of V+ to shut down
the supply current. This can be accomplished with simple
gate logic; however care must be taken if the logic and the
LT6233 operate from different supplies. If this is the case,
then open-drain logic can be used with a pull-up resistor to ensure that the amplifier remains off. See Typical
Performance Characteristics.
The output leakage current when disabled is very low;
however, current can flow into the input protection diodes
D1 and D2 if the output voltage exceeds the input voltage
by a diode drop.
623345fc
18
LT6233/LT6233-10
LT6234/LT6235
Typical Applications
Single Supply, Low Noise, Low Power, Bandpass Filter with Gain = 10
R1
732Ω
Frequency Response Plot of
Bandpass Filter
C2
47pF
f0 =
V+
23
1 = 1MHz
2πRC
C = √C1,C2 R = R1 = R2
VIN
R2
732Ω
(
0.1µF
R3
10k
–
LT6233
+
C3
0.1µF
VOUT
EN
R4
10k
)
f0 = 732Ω MHz, MAXIMUM f0 = 1MHz
R
f–3dB = f0
2.5
AV = 20dB at f0
EN = 6µVRMS INPUT REFERRED
IS = 1.5mA FOR V+ = 5V
GAIN (dB)
C1
1000pF
3
623345 F03
–7
100k
1M
FREQUENCY (Hz)
10M
623345 F04
Low Power, Low Noise, Single Supply, Instrumentation Amplifier with Gain = 100
R1
30.9Ω
C2
2200pF
R2
V+ 511Ω
C8
68pF
–
U1
LT6233-10
+
VIN1
C1
1µF
EN
R15
88.7Ω
R13
2k
–
R6
511Ω
R3
30.9Ω
R5
511Ω
R4
V+ 511Ω
U2
LT6233-10
+
VIN2
C3
1µF
R16
88.7Ω
R12
511Ω
R14
2k
–
EN
V+
R10
511Ω
+
C9
68pF
U3
LT6233
VOUT
EN
C4
10µF
VOUT = 100 (VIN2 – VIN1)
(
)( )
GAIN = R2 + 1
R1
R10
R15
INPUT RESISTANCE = R5 = R6
f–3dB = 310Hz TO 2.5MHz
EN = 10µVRMS INPUT REFERRED
IS = 4.7mA FOR VS = 5V, 0V
R1 = R3
R2 = R4
R10 = R12
R15 = R16
623345 F05
623345fc
19
LT6233/LT6233-10
LT6234/LT6235
Package Description
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
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)
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
S6 TSOT-23 0302
623345fc
20
LT6233/LT6233-10
LT6234/LT6235
Package Description
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698 Rev C)
0.70 ±0.05
3.5 ±0.05
1.65 ±0.05
2.10 ±0.05 (2 SIDES)
PACKAGE
OUTLINE
0.25 ± 0.05
0.50
BSC
2.38 ±0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
PIN 1
TOP MARK
(NOTE 6)
0.200 REF
3.00 ±0.10
(4 SIDES)
R = 0.125
TYP
5
0.40 ± 0.10
8
1.65 ± 0.10
(2 SIDES)
0.75 ±0.05
4
0.25 ± 0.05
1
(DD8) DFN 0509 REV C
0.50 BSC
2.38 ±0.10
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
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
623345fc
21
LT6233/LT6233-10
LT6234/LT6235
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
7
8
.245
MIN
.160 ±.005
5
6
.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)
3
2
4
.053 – .069
(1.346 – 1.752)
.008 – .010
(0.203 – 0.254)
.004 – .010
(0.101 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
1. DIMENSIONS IN
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)
SO8 0303
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)
4
5 6
7
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
*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
22
.0532 – .0688
(1.35 – 1.75)
2 3
.008 – .012
(0.203 – 0.305)
TYP
.0250
(0.635)
BSC
GN16 (SSOP) 0204
623345fc
LT6233/LT6233-10
LT6234/LT6235
Revision History
(Revision history begins at Rev C)
REV
DATE
DESCRIPTION
PAGE NUMBER
C
1/11
Revised y-axis lable on curve G40 in Typical Performance Characteristics
14
Updated ENABLE Pin section in Applications Information
18
623345fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
23
LT6233/LT6233-10
LT6234/LT6235
Typical Applications
The LT6233 is applied as a transimpedance amplifier with
an I-to-V conversion gain of 10kΩ set by R1. The LT6233
is ideally suited to this application because of its low input offset voltage and current, and its low noise. This is
because the 10k resistor has an inherent thermal noise of
13nV/√Hz or 1.3pA/√Hz at room temperature, while the
LT6233 contributes only 2nV and 0.8pA/√Hz. So, with
respect to both voltage and current noises, the LT6233 is
actually quieter than the gain resistor.
The circuit uses an avalanche photodiode with the cathode
biased to approximately 200V. When light is incident on
the photodiode, it induces a current IPD which flows into
the amplifier circuit. The amplifier output falls negative
to maintain balance at its inputs. The transfer function
is therefore VOUT = –IPD • 10k. C1 ensures stability and
good settling characteristics. Output offset was measured
at better than 500µV, so low in part because R2 serves to
cancel the DC effects of bias current. Output noise was
measured at below 1mVP-P on a 20MHz measurement
bandwidth, with C2 shunting R2’s thermal noise. As shown
in the scope photo, the rise time is 45ns, indicating a signal
bandwidth of 7.8MHz.
Low Power Avalanche Photodiode Transimpedance Amplifier
IS = 1.2mA
≈ 200V BIAS
C1
2.7pF
WWW.ADVANCEDPHOTONIX.COM
50mV/DIV
ADVANCED PHOTONIX
012-70-62-541
R1
10k
5V
–
R2
10k
Photodiode Amplifier Time Domain Response
LT6233
+
–5V
100ns/DIV
623345 TA02b
ENABLE
623345 TA02a
C2
0.1µF
OUTPUT OFFSET = 500µV TYPICAL
BANDWIDTH = 7.8MHz
OUTPUT NOISE = 1mVP-P (20MHz MEASUREMENT BW)
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
LT1028
Single, Ultralow Noise 50MHz Op Amp
0.85nV/√Hz
LT1677
Single, Low Noise Rail-to-Rail Amplifier
3V Operation, 2.5mA, 4.5nV/√Hz, 60µV Max VOS
LT1806/LT1807
Single/Dual, Low Noise 325MHz Rail-to-Rail Amplifier
2.5V Operation, 550µV Max VOS, 3.5nV/√Hz
LT6200/LT6201
Single/Dual, Low Noise 165MHz
0.95nV√Hz, Rail-to-Rail Input and Output
LT6202/LT6203/LT6204
Single/Dual/Quad, Low Noise, Rail-to-Rail Amplifier
1.9nV/√Hz, 3mA Max, 100MHz Gain Bandwidth
623345fc
24 Linear Technology Corporation
LT 0111 REV C • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
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