±270V Common Mode Difference Amplifier Features 97dB Min CMRR, ±35ppm Max Gain Error

News Release  www.linear.com
±270V Common Mode Difference Amplifier Features
97dB Min CMRR, ±35ppm Max Gain Error
MILPITAS, CA – January 11, 2016 – Linear Technology introduces the LT6375, a unity-gain
difference amplifier with integrated precision matched resistors, which precisely level shifts and
buffers small difference signals while rejecting up to ±270V common mode. The A-grade version
achieves unprecedented performance: CMRR is 97dB (min), initial gain error is 35ppm (max), gain
drift is 1ppm/°C (max) and gain nonlinearity is 2ppm (max) with a common mode divide ratio of
25:1. The common mode divide ratio is selectable from 7:1 to 25:1, enabling the designer to select
the ratio with the best performance for a given common mode input range.
At the heart of the LT6375 is a high precision Over-The-Top® amplifier which operates with
inputs both within and above the 3.3V to 50V supply voltage. This permits the combination of a
wide input range and low voltage supply. Use of a low voltage supply limits power consumption
and protects downstream circuitry from high voltage.
“The LT6375 combines a high precision, wide voltage range Over-The-Top amplifier with
configurable precision matched resistors,” says Maziar Tavakoli, Design Manager, Signal
Conditioning Products. “With seven different divider ratios to choose from, precision, noise and
speed can be optimized for specific input range requirements. For example, if the input common
mode range is ±80V, a resistor divider ratio of seven may be selected to achieve lower noise, lower
offset, and wider bandwidth than is achievable with a ratio of 20.”
±270V Common Mode Difference Amplifier Features
97dB Min CMRR, ±35ppm Max Gain Error
page 2
The LT6375 includes many other useful features, including rail-to-rail outputs, low supply
current and a shutdown mode. It is available in a 4mm x 4mm 12-lead DFN and a 4mm long MSOP
package with 12 leads. Both packages include skipped leads for extra spacing of high voltage input
signals.
The LT6375 is fully specified over the –40°C to 85°C (I-grade) and –40°C to 125°C
(H-grade) temperature ranges, priced starting at $2.95 each in 1,000 piece quantities. For more
information, visit www.linear.com/product/LT6375.
Photo Caption: ±270V Input Range Difference Amp Achieves 97dB CMRR
Summary of Features: LT6375
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±270V Common Mode Voltage Range
Outstanding Precision:
o CMRR
 97dB Minimum (A Grade)
 90dB Minimum (B Grade)
o Gain Error
 0.0035% Maximum (35ppm) (A-Grade)
 0.006% Maximum (60ppm) (B-Grade)
o Gain Error Drift: 1ppm/°C Maximum
o Gain Nonlinearity: 2ppm Maximum
o Offset Voltage
 300µV Maximum (A-Grade, Resistor Divide Ratio = 7)
 450µV Maximum (B-Grade, Resistor Divide Ratio = 7)
Wide Supply Voltage Range: 3.3V to 50V
Rail-to-Rail Output
350µA Supply Current
Selectable Internal Resistor Divider Ratio
575kHz –3dB Bandwidth (Resistor Divider = 7)
375kHz –3dB Bandwidth (Resistor Divider = 20)
–40°C to 125°C Specified Temperature Range
Low Power Shutdown: 20μA (DFN Package)
Space-Saving MSOP and DFN Packages
±270V Common Mode Difference Amplifier Features
97dB Min CMRR, ±35ppm Max Gain Error
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The USA list pricing shown is for budgetary use only. International prices may differ due to local
duties, taxes, fees and exchange rates.
About Linear Technology Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for over three decades. The Company’s products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs, µModule® subsystems, and wireless sensor network products. For more information, visit www.linear.com
, LT, LTC, LTM, Linear Technology, the Linear logo, Over-The-Top and µModule are registered trademarks of
Linear Technology Corp. All other trademarks are the property of their respective owners.
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