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.