LT6375 Datasheet, PDF (1/32 Pages) Linear Technology – 270V Common Mode Voltage Difference Amplifier

LT6375
±270V Common Mode
Voltage Difference Amplifier
FEATURES
nn _{±270V Common Mode Voltage Range}
nn _{97dB Minimum CMRR (LT6375A)}
nn _{0.0035% (35ppm) Maximum Gain Error (LT6375A)}
nn _{1ppm/°C Maximum Gain Error Drift}
nn _{2ppm Maximum Gain Nonlinearity}
nn _{Wide Supply Voltage Range: 3.3V to 50V}
nn _{Rail-to-Rail Output}
nn _{350µA Supply Current}
nn _{Selectable Internal Resistor Divider Ratio}
nn _{300µV Maximum Offset Voltage (LT6375A)}
nn _{575kHz –3dB Bandwidth (Resistor Divider = 7)}
nn _{375kHz –3dB Bandwidth (Resistor Divider = 20)}
nn _{–40°C to 125°C Specified Temperature Range}
nn _{Low Power Shutdown: 20μA (DFN Package Only)}
nn _{Space-Saving MSOP and DFN Packages}
APPLICATIONS
nn _{High Side or Low Side Current Sensing}
nn _{Bidirectional Wide Common Mode Range Current Sensing}
nn _{High Voltage to Low Voltage Level Translation}
nn _{Precision Difference Amplifier}
nn _{Industrial Data-Acquisition Front-Ends}
nn _{Replacement for Isolation Circuits}
DESCRIPTION
The LT^®6375 is a unity-gain difference amplifier which
combines excellent DC precision, a very high input common
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.
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.
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.
TYPICAL APPLICATION
Precision Wide Voltage Range, Bidirectional Current Monitor
15V
–REFA –REFB –REFC
V⁺
19k
38k
V_SOURCE+ = –270V TO 270V
–IN
R_SENSE
10Ω
R_C
10Ω _+IN
190k
190k
23.75k
190k
–
+
OUT _{VOUT = ±10mV/mA}
LOAD
19k
+REFA
38k
+REFB
190k
23.75k
+REFC SHDN V^–
–15V
REF
6375 TA01a
For more information www.linear.com/LT6375
Typical Distribution of CMRR
200
1248 UNITS
180 FROM 4 RUNS
160
V_S = ±15V
V_IN = ±270V
DIV = 25
140
120
100
80
60
40
20
0
–40 –30 –20 –10 0 10 20
CMRR (µV/V = ppm)
30 40
6375 TA01b
6375fa
1