Texas Instruments ADS1255 Handleiding

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SBAS288K − JUNE 2003 − REVISED SEPTEMBER 2013

Very Low Noise, 24-Bit

Analog-to-Digital Converter

ADS1255

ADS1256

FEATURES

D24 Bits, No Missing Codes

− All Data Rates and PGA Settings

DUp to 23 Bits Noise-Free Resolution

D±0.0010% Nonlinearity (max)

DData Output Rates to 30kSPS

DFast Channel Cycling

− 18.6 Bits Noise-Free (21.3 Effective Bits)

at 1.45kHz

DOne-Shot Conversions with Single-Cycle

Settling

DFlexible Input Multiplexer with Sensor Detect

− Four Differential Inputs (ADS1256 only)

− Eight Single-Ended Inputs (ADS1256 only)

DChopper-Stabilized Input Buffer

DLow-Noise PGA: 27nV Input-Referred Noise

DSelf and System Calibration for All PGA

Settings

D5V Tolerant SPI™-Compatible Serial Interface

DAnalog Supply: 5V

DDigital Supply: 1.8V to 3.6V

DPower Dissipation

− As Low as 38mW in Normal Mode

− 0.4mW in Standby Mode

APPLICATIONS

DScientific Instrumentation

DIndustrial Process Control

DMedical Equipment

DTest and Measurement

DWeigh Scales

DESCRIPTION

The ADS1255 and ADS1256 are extremely low-noise,

24-bit analog-to-digital (A/D) converters. They provide

complete high-resolution measurement solutions for the

most demanding applications.

The converter is comprised of a 4th-order, delta-sigma

(ΔΣ) modulator followed by a programmable digital filter. A

flexible input multiplexer handles differential or

single-ended signals and includes circuitry to verify the

integrity of the external sensor connected to the inputs.

The selectable input buffer greatly increases the input

impedance and the low-noise programmable gain

amplifier (PGA) provides gains from 1 to 64 in binary steps.

The programmable filter allows the user to optimize

between a resolution of up to 23 bits noise-free and a data

rate of up to 30k samples per second (SPS). The

converters offer fast channel cycling for measuring

multiplexed inputs and can also perform one-shot

conversions that settle in just a single cycle.

Communication is handled over an SPI-compatible serial

interface that can operate with a 2-wire connection.

Onboard calibration supports both self and system

correction of offset and gain errors for all the PGA settings.

Bidirectional digital I/Os and a programmable clock output

driver are provided for general use. The ADS1255 is

packaged in an SSOP-20, and the ADS1256 in an

SSOP-28.

SPI is a trademark of Motorola, Inc. All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

www.ti.com

Copyright © 2003−2013, Texas Instruments Incorporated

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.

XTAL2

Serial

Interface

Mux

and

Sensor

Detect

Programmable

DigitalFilter

4th−Order

Modulator

VREFPVREFN

ADS1256Only

ADS1256

Only

Buffer

AVDDDVDD

1:64

DGND

D3D2D1D0/CLKOUTAGND

AIN0

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

AIN7

AINCOM

XTAL1/CLKIN

RESET

DRDY

SCLK

DIN

SYNC/PDWN

CS

DOUT

Control

General

Purpose

DigitalI/O

Clock

Generator

PGA

Product specificaties