Texas Instruments ADS1271 Handleiding

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SBAS306F − NOVEMBER 2004 − REVISED OCTOBER 2007

  

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

FEATURES

D105kSPS Data Rate

DAC Performance:

51kHz Bandwidth

109dB SNR (High-Resolution Mode)

−108dB THD

DDC Accuracy:

1.8µV/°C Offset Drift

2ppm/°C Gain Drift

DSelectable Operating Modes:

High-Speed: 105kSPS Data Rate

High-Resolution: 109dB SNR

Low-Power: 35mW Dissipation

DPower-Down Control

DDigital Filter:

Linear Phase Response

Passband Ripple: ±0.005dB

Stop Band Attenuation: 100dB

DInternal Offset Calibration On Command

DSelectable SPIt or Frame Sync Serial Interface

DDesigned for Multichannel Systems:

Daisy-Chainable Serial Interface

Easy Synchronization

DSimple Pin-Driven Control

DModulator Output Option

DSpecified from −40°C to +105°C

DAnalog Supply: 5V

DDigital Supply: 1.8V to 3.3V

APPLICATIONS

DVibration/Modal Analysis

DAcoustics

DDynamic Strain Gauges

DPressure Sensors

DTest and Measurement

DESCRIPTION

The ADS1271 is a 24-bit, delta-sigma analog-to-digital

converter (ADC) with a data rate up to 105kSPS. It offers

a unique combination of excellent DC accuracy and

outstanding AC performance. The high-order,

chopper-stabilized modulator achieves very low drift with

low in-band noise. The onboard decimation filter

suppresses modulator and signal out-of-band noise. The

ADS1271 provides a usable signal bandwidth up to 90%

of the Nyquist rate with less than 0.005dB of ripple.

Traditionally, industrial delta-sigma ADCs offering good

drift performance use digital filters with large passband

droop. As a result, they have limited signal bandwidth and

are mostly suited for DC measurements. High-resolution

ADCs in audio applications offer larger usable bandwidths,

but the offset and drift specification are significantly

weaker than their industrial counterparts. The ADS1271

combines these converters, allowing high-precision

industrial measurement with excellent DC and AC

specifications ensured over an extended industrial

temperature range.

Three operating modes allow for optimization of speed,

resolution, and power. A selectable SPI or a frame-sync

serial interface provides for convenient interfacing to

microcontrollers or DSPs. The output from the modulator

is accessible for external digital filter applications. All

operations, including internal offset calibration, are

controlled directly by pins; there are no registers to

program.

∆Σ

Modulator

Digital

Filter

VREFPVREFNAVDDDVDD

DRDY/FSYNC

SCLK

DOUT

DIN

FORMAT

AINP

AINN

Serial

Interface

Control

Logic

DGNDAGND

SYNC/PDWN

MODE

CLK

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

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

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