ADS1282

BurrBrown Products

from Texas Instruments

1

FEATURES

DESCRIPTION

APPLICATIONS

4th-Order

DS

Modulator

Programmable

DigitalFilter

SPI

Interface

Calibration

Control

CLK

AVDD

AVSS

DVDD

DGND

Over-Range

ModulatorOutput

ADS1282

DOUT

DIN

DRDY

SCLK

SYNC

RESET

PWDN

3

PGA

Input1

Input2

VREFN

VREFP

V

COM

ADS1282

SBAS418A – SEPTEMBER 2007 – REVISED DECEMBER 2007

High-Resolution Analog-to-Digital Converter

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• High Resolution:

The ADS1282 is an extremely high-performance,

–130dB SNR (250SPS, High-Resolution Mode)

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

–127dB SNR (250SPS, Low-Power Mode)

integrated, low-noise programmable gain amplifier

(PGA) and two-channel input MUX. The ADS1282 is

• High Accuracy:

suitable

for

the

demanding

needs

of

energy

THD: –120dB

exploration and seismic monitoring environments.

INL: 0.8ppm

The converter uses a fourth-order, inherently stable,

• Low-Noise PGA

delta-sigma (

ΔΣ) modulator that provides outstanding

• Two-Channel Input MUX

noise and linearity performance. The modulator is

• Inherently-Stable Modulator with Fast

used either in conjunction with the on-chip digital

Responding Over-Range Detection

filter,

or

can

be

bypassed

for

use

with

post

processing filters.

• Flexible Digital Filter:

Sinc + FIR + IIR (Selectable)

The

flexible

input

MUX

provides

an

additional

Linear or Minimum Phase Response

external input for measurement, as well as internal

Programmable High-Pass Filter

self-test connections. The PGA features very low

noise (4nV/

√Hz) and high input impedance, allowing

Selectable FIR Data Rates: 250SPS to 4kSPS

easy interfacing to geophones and hydrophones.

• Filter Bypass Option

The digital filter provides selectable data rates from

• Low Power Consumption:

250 to 4000 samples per second (SPS). The

High-Resolution Mode: 27mW

high-pass filter (HPF) features an adjustable corner

Low-Power Mode: 16mW

frequency. On-chip gain and offset scaling registers

Shutdown: 10

µW

supports system calibration.

• Offset and Gain Calibration Engine

The synchronization input (SYNC) can be used to

• Synchronization Input

synchronize the conversions of multiple ADS1282s.

• Analog Supply:

The SYNC input also accepts a clock input for

Unipolar (+5V) or Bipolar (±2.5V)

continuous alignment of conversions from an external

source.

• Digital Supply: 1.8V to 3.3V

Two operating modes allow optimization of noise and

power. Together, the amplifier, modulator, and filter

dissipate 27mW and only 16mW in low-power mode.

• Energy Exploration

The ADS1282 is available in a compact TSSOP-28

• Seismic Monitoring

package and is fully specified from –40

°C to +85°C,

• High-Accuracy Instrumentation

with a maximum operating range to +125

°C.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCT PREVIEW information concerns products in the

Copyright © 2007, Texas Instruments Incorporated

formative or design phase of development. Characteristic data and

other specifications are design goals. Texas Instruments reserves

the right to change or discontinue these products without notice.