BurrBrown Products

from Texas Instruments

FEATURES

DESCRIPTION

APPLICATIONS

Internal 2.5V

Reference

RC Oscillator

20MHz

Interface

Circuit

MDATA

IADJ

IOUT

AVDD

ADS1208

REFOUT

REFIN

V

IN+

V

IN

−

MDATA

BVDD

MCLK

M0

M1

MCLK

Buffer

Buffer

Buffer

Buffer

2nd−Order

∆Σ Modulator

BGND

AGND

AVDD

ADS1208

SBAS348A – MARCH 2005 – REVISED MARCH 2005

2nd-Order Delta-Sigma Modulator

with Excitation for Hall Elements

•

±100mV Specified Input Range

The ADS1208 is a 2nd-order

∆Σ (delta-sigma) modu-

lator operating at a 10MHz clock rate. The specified

•

±125mV Full-Scale Range

input

range

is

±100mV,

optimized

for

current

•

95dB typ. CMR, 82dB typ. SNR

measurement with a Hall sensor, especially in motor

•

Adjustable Current Output for Sensor Biasing

control

applications.

The

ADS1208

contains

a

•

Digital Output Compatible to ADS1202/03

programmable current source for sensor biasing and

has integrated input buffers for fast settling of the

•

Differential Digital Outputs

sample capacitors; it also requires only a minimum of

•

Separate 2.7V to 5.5V Digital Supply Pin

external components. The differential analog input

offers low noise and excellent common-mode rejec-

tion.

•

Motor Control

•

Current Measurement

•

Hall Sensors

•

Bridge Sensors

•

Instrumentation

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005, 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.