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INA149
www.ti.com SBOS579B – SEPTEMBER 2011 – REVISED JULY 2012 High Common-Mode Voltage Difference Amplifier
FEATURES DESCRIPTION The INA149 is a precision unity-gain difference
amplifier with a very high input common-mode
voltage range. It is a single, monolithic device that
consists of a precision op amp and an integrated thinfilm resistor network. The INA149 can accurately
measure small differential voltages in the presence of
common-mode signals up to В±275 V. The INA149
inputs are protected from momentary common-mode
or differential overloads of up to 500 V. 1 2 Common-Mode Voltage Range: В±275 V
Minimum CMRR: 90 dB from –40°C to +125°C
DC Specifications:
– Maximum Offset Voltage: 1100 μV
– Maximum Offset Voltage Drift: 15 μV/°C
– Maximum Gain Error: 0.02%
– Maximum Gain Error Drift: 10 ppm/°C
– Maximum Gain Nonlinearity: 0.001% FSR
AC Performance:
– Bandwidth: 500 kHz
– Typical Slew Rate: 5 V/μs
Wide Supply Range: В±2.0 V to В±18 V
– Maximum Quiescent Current: 900 μA
– Output Swing on В±15-V Supplies: В±13.5 V …
