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1 Features

1? High Resolution:

130-dB SNR (250 SPS)

? High Accuracy:

THD: –122 dB

INL: 0.5 ppm

? Low-Noise PGA

? Two-Channel Input Mux

? Inherently-Stable Modulator with Fast Responding

Overrange Detection

? Flexible Digital Filter:

Sinc + FIR + IIR (Selectable)

Linear or Minimum Phase Response

Programmable High-Pass Filter

Selectable FIR Data Rates: 250 SPS to 4 kSPS

? Filter Bypass Option

? Low Power Consumption: 25 mW

Shutdown: 10 μW

? Offset and Gain Calibration Engine

? SYNC Input high?

Analog Supply:

Unipolar (+5 V) or Bipolar (±2.5 V)

? Digital Supply: 1.8 V to 3.3 V

2 Applications

? Energy Exploration

? Seismic Monitoring

? High-Accuracy Instrumentation

3 Description

The ADS1282 is an extremely high-performance,

single-chip analog-to-digital converter (ADC) with an

integrated, low-noise programmable gain amplifier

(PGA) and two-channel input multiplexer (mux). The

ADS1282 is suitable for the demanding needs of

energy exploration and seismic monitoring

environments.

The converter uses a fourth-order, inherently stable,

delta-sigma (ΔΣ) modulator that provides outstanding

noise and linearity performance. The modulator is

used either in conjunction with the on-chip digital filter, or can be bypassed for use with post

processing filters.

The flexible input MUX provides an additional

external input for measurement, as well as internal

self-test connections. The PGA features outstanding

low noise (5 nV/√Hz) and high input impedance,

allowing easy interfacing to geophones and

hydrophones over a wide range of gains.

The digital filter provides selectable data rates from

250 to 4000 samples per second (SPS). The high?

pass filter (HPF) features an adjustable corner

frequency. On-chip gain and offset scaling registers support system calibration.

The synchronization input (SYNC) can be used to

synchronize the conversions of multiple ADS1282s. The SYNC input also accepts a clock input for

continuous alignment of conversions from an external

source.

Together, the amplifier, modulator, and filter dissipate

25 mW. The ADS1282 is available in a compact

TSSOP-28 package and is fully specified from –40°C

to +85°C, with a maximum operating range to

+125°C.