ADS1255IDB Burr-Brown Corporation, ADS1255IDB Datasheet

ADS1255IDB

Manufacturer Part Number

ADS1255IDB

Description

Very Low Noise/ 24-Bit Analog-to-Digital Converter

Manufacturer

Burr-Brown Corporation

Datasheet

1.ADS1255IDB.pdf (39 pages)

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FEATURES

APPLICATIONS

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.

All trademarks are the property of their respective owners.

24 Bits, No Missing Codes

Up to 23 Bits Noise-Free Resolution

Data Output Rates to 30kSPS

Fast Channel Cycling

One-Shot Conversions with Single-Cycle

Settling

Flexible Input Multiplexer with Sensor Detect

Chopper-Stabilized Input Buffer

Low-Noise PGA: 27nV Input-Referred Noise

Self and System Calibration for All PGA

Settings

5V Tolerant SPI -Compatible Serial Interface

Analog Supply: 5V

Digital Supply: 1.8V to 3.6V

Power Dissipation

Weigh Scales

Scientific Instrumentation

Industrial Process Control

Medical Equipment

Test and Measurement

0.0010% Nonlinearity (max)

− All Data Rates and PGA Settings

− 18.6 Bits Noise-Free (21.3 Effective Bits)

− Four Differential Inputs (ADS1256 only)

− Eight Single-Ended Inputs (ADS1256 only)

− As Low as 38mW in Normal Mode

− 0.4mW in Standby Mode

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.

at 1.45kHz

AINCOM

Analog to Digital Converter

AIN0

AIN1

AIN2

AIN3

AIN4

AIN5

AIN6

AIN7

Very Low Noise, 24 Bit

Sensor

Detect

Mux

AGND

and

AVDD

www.ti.com

Buffer

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

(

flexible

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.

) modulator followed by a programmable digital filter. A

PGA

1:64

input

VREFP

4th−Order

Modulator

ADS1256

D3 D2

Only

Digital I/O

SBAS288D − JUNE 2003 − REVISED AUGUST 2004

multiplexer

General

Purpose

VREFN

D1 D0/CLKOUT

2003−2004, Texas Instruments Incorporated

Programmable

Digital Filter

handles

Generator

Interface

Control

Clock

Serial

DVDD

DGND

differential

ADS1255

ADS1256

XTAL1/CLKIN

XTAL2

RESET

SYNC/PDWN

DRDY

SCLK

DIN

DOUT

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