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Industry's Highest Accuracy
Difference Amplifier for Applications
with CMV up to ±275V

The INA149 is a precision unity-gain difference amplifier with the industry's highest Common-Mode Rejection Ratio (CMRR) for high input common mode voltage (CMV) applications. With 100dB (typ) CMRR, the INA149 can accurately measure small differential voltages in the presence of common-mode signals up to ±275V. The INA149 inputs are protected from momentary common-mode or differential overvoltage up to 500V making it the ideal solution for high accuracy, high voltage industrial applications.

Features

Extended Input Common
Mode Voltage:

±275V at Vs = ±15V
Minimum CMRR of 90dB guaranteed over full temp.
range from –40°C to 125°C

Excellent Gain Accuracy
and Linearity

Fixed Differential Gain = 1V/V
Low Gain Error: 0.02% max
Non-Linearity: 0.001% max
500kHz Bandwidth

Wide Supply Range:

+4V to 36V or ±2V to ±18V

CMRR vs. Frequency

Battery Stack Monitoring Application

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Applications

High-voltage current sensing
Battery cell voltage monitoring
Power-supply current monitoring
Motor control

Leading Instrumentation Amplifier Portfolio

Device	Gain	CMRR (dB min) G = 100	Offset Drift (μV/°C max) G = 100	Gain Error Drift (ppm/°C max) G = 1	Input Bias Current (nA max)	BW (kHz) at G = 100	Supply Current (mA max)	Supply Voltage (V)
INA826	1 - 1000	120	2.1	1	65	60	0.25	2.7 to 36
INA333	1 - 1000	100	0.1	5	0.2	3.5	0.075	1.8 to 5.5
PGA280	0.125 - 128	122	0.17	2	1	20	3	±5 to ±18
INA129	1 - 10000	120	0.7	10	5	200	0.75	±2.25 to ±18
INA121	1 - 10000	96	5.2	10	50	50	0.525	±2.25 to ±18
INA163	1 - 10000	70	1.2 (typ)	10	1200	3400	12	±4.5 to ±18

The NEW INA826 is a new 2.7-36V supply instrumentation amplifier that offers a 40% reduction in power consumption, 50% lower settling time, 35% lower noise, 60% lower gain drift (G>1) and over 1.5 times better common mode rejection ratio than its closest competitor.

The INA333 is a low-power, precision instrumentation amplifier offering excellent accuracy. The versatile 3-op amp design, small size, and low power make it ideal for a wide range of portable applications.

The PGA280 is a high-precision +/-5V to +/-18V supply instrumentation amplifier with digitally controllable gain and signal integrity test capability. This device offers low offset voltage, near-zero offset and gain drift, excellent linearity, and nearly no 1/f noise with superior common-mode and supply rejection to support high-resolution precision measurement.