Gain

Network

ADC

(ADS1259)

+5V

+15V

-

15V

Switch

Matrix

and

100 A

Source

Sinkand

Buffer

m

ControlRegister

7xGPIO

SPIInterface

INP2

INN2

INP1

INN1

Address

MUX

SPI

PGA280

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

PGA280

SBOS487B – JUNE 2009 – REVISED MARCH 2020

PGA280 Zerø-Drift, High-Voltage,

Programmable Gain Instrumentation Amplifier

1

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 1

⅜ 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 high-

resolution 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.

Device Comparison

FEATURES

PRODUCT

23-bit resolution, ΔΣ analog-to-digital converter

ADS1259

Chopper-stabilized instrumentation amplifier,

RR I/O, 5V single-supply

INA333

High-precision PGA, G = 1, 10, 100, 1000

PGA204

High-precision PGA, JFET Input, G = 1, 2, 4, 8

PGA206

Typical Application