LT6375
±±27V Common Mode
Voltage Difference Amplifier
FEATURES
DESCRIPTION
The LT®6375 is a unity-gain difference amplifier which
combinesexcellentDCprecision,averyhighinputcommon
mode range and a wide supply voltage range. It includes a
precision op amp and a highly-matched thin film resistor
network. It features excellent CMRR, extremely low gain
error and extremely low gain drift.
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270V Common Mode Voltage Range
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97dB Minimum CMRR (LT6375A)
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0.0035% (35ppm) Maximum Gain Error (LT6375A)
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1ppm/°C Maximum Gain Error Drift
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2ppm Maximum Gain Nonlinearity
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Wide Supply Voltage Range: 3.3V to 50V
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Rail-to-Rail Output
350µA Supply Current
Comparing the LT6375 to existing difference amplifiers
with high common mode voltage range, the selectable
resistor divider ratios of the LT6375 offer superior system
performance by allowing the user to achieve maximum
SNR, precision and speed for a specific input common
mode voltage range.
The op amp at the core of the LT6375 has Over-The-Top®
protected inputs which allow for robust operation in envi-
ronments with unpredictable voltage conditions. See the
Applications Information section for more details.
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Selectable Internal Resistor Divider Ratio
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300µV Maximum Offset Voltage (LT6375A)
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575kHz –3dB Bandwidth (Resistor Divider = 7)
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375kHz –3dB Bandwidth (Resistor Divider = 20)
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–40°C to 125°C Specified Temperature Range
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Low Power Shutdown: 20μA (DFN Package Only)
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Space-Saving MSOP and DFN Packages
APPLICATIONS
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High Side or Low Side Current Sensing
The LT6375 is specified over the –40°C to 125°C tem-
perature range and is available in space-saving MSOP16
and DFN14 packages.
L, LT, LTC, LTM, Linear Technology, Over-The-Top and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
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Bidirectional Wide Common Mode Range Current Sensing
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High Voltage to Low Voltage Level Translation
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Precision Difference Amplifier
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Industrial Data-Acquisition Front-Ends
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Replacement for Isolation Circuits
TYPICAL APPLICATION
Precision Wide Voltage Range, Bidirectional Current Monitor
Typical Distribution of CMRR
15V
200
180
160
140
120
100
80
1248 UNITS
FROM 4 RUNS
V
V
= ±±15
S
+
–REFA
19k
–REFB
38k
–REFC
23.75k
V
= ±±270
IN
DIV = 25
190k
+
V
= –270V TO 270V
SOURCE
190k
–IN
+IN
–
+
R
OUT
REF
SENSE
R
10Ω
C
V
= 10ꢀV/ꢀA
OUT
10Ω
190k
60
40
LOAD
20
190k
19k
+REFA
38k
23.75k
+REFC
0
–40 –30 –20 –10
0
10 20 30 40
–
+REFB
SHDN
V
CMRR (µV/V = ppm)
6375 TA01a
6375 TA01b
–15V
6375fa
1
For more information www.linear.com/LT6375
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