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PGA281AIPWR

Zero-drift PGA, 1/8-128 V/V gain, 5uV Vos, 140dB CMRR, 36V, diff output, TSSOP-16

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Manufacturer Part：

PGA281AIPWR

Package：

TSSOP-16 (5.0 x 6.4 x 1.2 mm)

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Description

Product Overview

The PGA281AIPWR from Texas Instruments is a precision zero-drift programmable gain instrumentation amplifier with digitally-controllable gain from 1/8 V/V to 128 V/V, 5uV offset, 140dB CMRR, and 36V supply capability in a TSSOP-16 package.

Key Specifications

Channels 1
Gain Range 1/8 V/V to 128 V/V (binary steps)
Supply Voltage 10V to 36V (5V to 18V dual)
Input Common-Mode +/-15.5V at +/-18V supply
Input Offset Voltage 5uV (typ at G=128)
Offset Drift 0.03 uV/C (typ)
Gain Drift 0.5 ppm/C (typ)
CMRR 140 dB (typ)
Gain Bandwidth 6 MHz
Slew Rate 1 V/us
Input Noise 7.5 nV/rtHz (typ at 1kHz)
Input Bias Current 2 nA (typ)
IQ per Channel 3.15 mA (typ)
Linearity (INL) 0.0001%
Package TSSOP-16
Operating Temperature -40 to +125 C

Features

  • Binary gain steps from 1/8 V/V (attenuation) to 128 V/V
  • Near-zero offset and gain drift via proprietary autozeroing
  • 140dB CMRR for excellent common-mode rejection
  • Fully differential, rail-to-rail output for ADC interfacing
  • High input impedance (1GOhm) for sensor applications
  • Overload detection output
  • Very low 1/f noise due to chopper stabilization

Applications

  • Precision signal instrumentation
  • Medical instrumentation
  • Industrial process control
  • Strain gauge amplifiers
  • Multi-channel data acquisition systems

The PGA281AIPWR from Texas Instruments is a high-precision, digitally programmable gain instrumentation amplifier using proprietary autozeroing (chopper stabilization) techniques to achieve near-zero offset voltage drift and gain drift. The device offers binary gain steps from 1/8 V/V (attenuation for high-voltage inputs) to 128 V/V (amplification for low-level signals), with additional scaling factors of 1 V/V and 1-3/8 V/V, making it a universal analog front-end for a wide variety of sensor and signal conditioning applications. The 36V supply capability and wide +/-15.5V input common-mode range at +/-18V supply comply with requirements for universal signal measurement in industrial environments. Key precision specifications include 5uV typical offset voltage at G=128, 0.03uV/C offset drift, 0.5ppm/C gain drift, 1.5ppm integral nonlinearity, and 140dB CMRR (typical). The very low 1/f noise characteristic of chopper-stabilized amplifiers enables precision measurement at low frequencies without drift errors. The fully differential, rail-to-rail output is designed to directly interface with high-resolution delta-sigma ADCs in their low-voltage domain. The PGA281 includes an overload detection output that indicates when the input signal exceeds the valid range, useful for system diagnostics and fault detection. The device is available in a TSSOP-16 package specified from -40 to +105C (A grade) or -40 to +125C (I grade).

The PGA281AIPWR operates as a chopper-stabilized programmable gain instrumentation amplifier. Key subsystems include: (1) Autozeroing Core – proprietary chopper stabilization eliminates 1/f noise and reduces offset voltage drift to near-zero; the input signal is modulated to a higher frequency where the amplifier has flat noise characteristics, amplified, then demodulated back to baseband; (2) Programmable Gain Network – internal resistor networks and switches configure binary gain steps from 1/8 V/V to 128 V/V via 4 digital gain control pins (G0-G3); the gain setting also includes a scaling factor pin for 1x or 1.375x multiplication; total available gains range from 0.125 V/V to 176 V/V; (3) High-Impedance Input – the differential input stage presents >1GOhm input impedance, allowing direct connection to high-impedance sensors without loading effects; input common-mode range extends to +/-15.5V with +/-18V supplies; (4) Differential Output – the output stage provides a fully differential, rail-to-rail output voltage referenced to a user-settable VOCM pin; this enables direct connection to differential-input ADCs; (5) Overload Detection – an open-drain FLAG output goes active when the input signal exceeds the valid measurement range, enabling system-level diagnostics and safety checks; (6) Gain Control – 4 GPIO-compatible digital pins (G0-G3) select one of 16 binary gain settings; gain changes occur in <1us with minimal transient settling.

Pin Name Function
1 VSP Positive analog supply (up to 18V)
2 VSN Negative analog supply (down to -18V)
3 VIN+ Non-inverting differential input
4 VIN- Inverting differential input
5 VSOP Positive output supply (2.7-5.5V)
6 VSON Negative output supply
7 VOUT+ Positive differential output
8 VOUT- Negative differential output
9 VOCM Output common-mode voltage setpoint
10 DVDD Digital supply (2.7-5.5V)
11-14 G0-G3 Gain select digital inputs
15 FLAG Overload detection output (open-drain)
16 REF Reference input / gain scaling
  • Strain gauge bridge: 128x gain amplifies mV-level bridge output to ADC input range with 5uV offset precision
  • Industrial 4-20mA loop: 1/8x gain attenuates high common-mode voltage to low-voltage ADC range
Manufacturer Part Number Package Notes
TI PGA280AIPWR TSSOP-16 SPI interface version with input mux
ADI AD8253ACPZ LFCSP-10 Programmable gain, 10MHz BW
TI INA828AIDR SOIC-8 Fixed-gain instrumentation amplifier
ADI AD8422ARMZ MSOP-8 Low-power instrumentation amplifier
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