Programmable

DigitalFilter

2.5V

Reference

DS

Modulator

VREFP

VREFN REFOUT

AVDD

DVDD

DGND

AVSS

AINP

AINN

XTAL2

XTAL1/CLKIN

Control

and

Serial

Interface

Clock

Generator

Out-of-Range

Detection

RESETPWDN

/

DRDY

SCLK

DIN

START

CS

DOUT

Calibration

Engine

f

/8

CLK

SYNCOUT

ADS1259

ADS1259

www.ti.com

SBAS424C – JUNE 2009 – REVISED MARCH 2010

Industrial, 14kSPS, 24-Bit Analog-to-Digital Converter

with Low-Drift Reference

Check for Samples: ADS1259

1

FEATURES

DESCRIPTION

23

•

24 Bits, No Missing Codes

The ADS1259 is a high-linearity, low-drift, 24-bit,

analog-to-digital converter (ADC) designed for the

•

Output Data Rates From 10 To 14kSPS

needs

of

industrial

process

control,

precision

•

High Performance:

instrumentation, and other exacting applications.

–

INL: 0.4ppm

Combined with a signal amplifier (such as the

–

Reference Drift: 2ppm/°C

PGA280),

a

high-resolution,

high-accuracy

measurement system is formed that is capable of

–

Gain Drift: 0.5ppm/°C

digitizing a wide range of signals.

–

Offset Drift: 0.05mV/°C

The converter uses a fourth-order, inherently stable,

–

delta-sigma (

ΔΣ) modulator that provides outstanding

•

Simultaneous 50/60Hz Rejection at 10SPS

noise and linearity performance. The data rates are

•

Single-Cycle Settling

programmable

up

to

14kSPS

including

10SPS,

50SPS, and 60SPS that provide excellent normal

•

Internal Oscillator

mode line-cycle rejection. The digital filter can be

•

Out-of-Range Detection

programmed for a fast settling mode where the

•

Readback Data Integrity by Checksum and

conversions settle in a single cycle, or programmed

for a high line-cycle rejection mode. A fast responding

Redundant Data Read Capability

input over-range detector flags the conversion data if

•

SPI™-Compatible Interface

an input over-range should occur.

•

Analog Supply: +5V or ±2.5V

The ADS1259 also provides an integrated low-noise,

•

Digital Supply: +2.7V to +5V

very low drift 2.5V reference. The on-chip oscillator,

•

Low Power: 13mW

an external crystal, or an external clock can by used

as the ADC clock source.

APPLICATIONS

Data and control communication are handled over a

•

Industrial Process Control

4MHz, SPI-compatible interface capable of operating

•

Scientific Instrumentation

with a minimum of three wires. Data integrity is

•

Test and Measurement

augmented by data bytes checksum and redundant

data read capability. Conversions are synchronized

either by command or by pin.

Dissipating only 13mW in operation, the ADS1259

can be powered down, dissipating less than 25mW.

The ADS1259 is offered in a TSSOP-20 package and

is fully specified from –40°C to +105°C.

RELATED PRODUCTS

FEATURES

PRODUCT

24-bit ADC with integrated PGA

ADS1256

Wide-range PGA

PGA280

High-precision PGA; G = 1, 10, 100, 1000

PGA204

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

SPI is a trademark of Motorola.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.