1 Features

1• Wide input range: ±15.5 V at ±18-V supply

• Binary gain steps: 128V/V to 1/8 V/V

• Additional scaling factor: 1 V/V and 1⅜ V/V

• Low offset voltage: 3 μV at G = 128

• Near-zero long-term drift of offset voltage

• Near-zero gain drift: 0.5 ppm/°C

• Excellent linearity: 1.5 ppm

• Excellent CMRR: 140 dB

• High input impedance

• Very low 1/f noise

• Differential signal output

• Overload detection

• Input configuration switch matrix

• Wire break test current

• Expandable SPI™ with checksum

• General-purpose I/O port

• TSSOP-24 package

2 Applications

• Analog input module

• Data acquisition (DAQ)

• Aircraft engine control

• Battery test

3 Description

The PGA280 is a high-precision 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 highresolution

precision measurement. The 36-V supply

capability and wide, high-impedance input range

comply with requirements for universal signal

measurement.

Special circuitry prevents inrush currents from

multiplexer (MUX) switching. In addition, the input

switch matrix enables easy reconfiguration and

system-level diagnostics—overload conditions are

indicated.

The configurable general-purpose input/output

(GPIO) offers several control and communication

features. The SPI can be expanded to communicate

with more devices, supporting isolation with only four

ISO couplers. The PGA280 is available in a TSSOP-

24 package and is specified from –40°C to +105°C.

For all available packages, see the package option

addendum at the end of the data sheet.