SBAS318C − JUNE 2004 − REVISED JANUARY 2008

Motor Control, Current Measurement

1Bit, 10MHz, 2ndOrder, DeltaSigma Modulator

ADS1203

ADS

1 2 0

3

A D S

1 2 0

3

FEATURES

Modes

Split-Phase or Manchester Coding for

One-Line Interfacing

−40

°C to +125°C

APPLICATIONS

DESCRIPTION

The ADS1203 is a delta-sigma (

∆Σ) modulator with a

95dB dynamic range, operating from a single +5V

supply. The differential inputs are ideal for direct

connection to transducers or low-level signals. With the

appropriate digital filter and modulator rate, the device

can be used to achieve 16-bit analog-to-digital (A/D)

conversion with no missing codes. An effective

resolution of 14 bits or SNR of 85dB (typical) can be

maintained with a digital filter bandwidth of 40kHz at a

modulator rate of 10MHz. The ADS1203 is designed for

use in medium- to high-resolution measurement

applications including current measurements, smart

transmitters, and industrial process control. The

ADS1203 is available in TSSOP-8 and QFN-16 (3x3)

packages.

V

Second−Order

∆Σ Modulator

Interface

Circuit

Buffer

20MHz

RC Oscillator

2.5V

Reference

Voltage

V

GND (AGND)

NOTE: BOLD pins are available only in QFN package.

GND (BGND)

MDAT

MCLK

CLKOUT

V

V

REFIO

M0

M1

20k

Ω

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.

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 2004−2008, Texas Instruments Incorporated

All 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.

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