2nd-Order

DS Modulator

CHA+

AVDD

CHA-

Output

Interface

Circuit

RC

Oscillator

20MHz

Out

EN

Clock

Select

Divider

REFINA

Reference

Voltage

2.5V

REFOUT

OUTA

OUTB

CLKIN

AGND

BGND

BVDD

CLKOUT

CLKSEL

2nd-Order

DS Modulator

CHB+

CHB-

REFINB

ADS1209

www.ti.com

SBAS491 – FEBRUARY 2010

Two 1-Bit, 10MHz, 2nd-Order

Delta-Sigma Modulators

Check for Samples: ADS1209

1

FEATURES

DESCRIPTION

2

•

16-Bit Resolution

The ADS1209 is a two-channel, high-performance,

delta-sigma (

ΔΣ) modulator with an 86dB dynamic

•

13-Bit Linearity

range, operating from a single +5V supply. The

•

±2.3V Specified Input Voltage Range

differential inputs are ideal for direct connection to

•

Internal Reference Voltage: 2%

signal sources in an industrial environment. With the

•

Gain Error: 0.5%

appropriate digital filter and modulator rate, the

device can be used to achieve 16-bit analog-to-digital

•

Two Independent Delta-Sigma Modulators

(A/D) conversion with no missing codes. Effective

•

Two Input Reference Buffers

accuracy of 14 bits can be obtained with a digital filter

•

On-Chip Oscillator

bandwidth of 20kHz at a modulator rate of 10MHz.

The ADS1209 is designed for use in high-resolution

•

Selectable Internal or External Clock

measurement

applications

including

current

•

Specified Temperature Range:

measurements,

industrial

process

control,

and

–40°C to +105°C

resolvers. It is available in a TSSOP-24 package and

•

TSSOP-24 Package

is

specified

for

operation

over

the

ambient

temperature range of –40°C to +105°C.

APPLICATIONS

•

Motor Control

•

Current Measurement

•

Resolver

•

Industrial Process Control

•

Instrumentation

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 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.