12-Bit, 4-Channel Parallel Output Sampling

ANALOG-TO-DIGITAL CONVERTER

FEATURES

q SINGLE SUPPLY: 2.7V to 5V

q 4-CHANNEL INPUT MULTIPLEXER

q UP TO 200kHz SAMPLING RATE

q FULL 12-BIT PARALLEL INTERFACE

q

±1LSB INL AND DNL

q NO MISSING CODES

q 72dB SINAD

q LOW POWER: 2mW

q SSOP-28 PACKAGE

DESCRIPTION

The ADS7842 is a complete, 4-channel, 12-bit Analog-to-

Digital Converter (ADC). It contains a 12-bit, capacitor-

based, Successive Approximation Register (SAR) ADC with

a sample-and-hold amplifier, interface for microprocessor

use, and parallel, 3-state output drivers. The ADS7842 is

specified at a 200kHz sampling rate while dissipating only

2mW of power. The reference voltage can be varied from

100mV to VCC with a corresponding LSB resolution from

24

µV to 1.22mV. The ADS7842 is tested down to 2.7V

operation.

Low power, high speed, and an onboard multiplexer make

the ADS7842 ideal for battery-operated systems such as

portable, multi-channel dataloggers and measurement equip-

ment. The ADS7842 is available in an SSOP-28 package

and is tested over the –40

°C to +85°C temperature range.

APPLICATIONS

q DATA ACQUISITION

q TEST AND MEASUREMENT

q INDUSTRIAL PROCESS CONTROL

q MEDICAL INSTRUMENTS

q LABORATORY EQUIPMENT

ADS7

842

SAR

Output

Latches

and

3-State

Drivers

3-State

Parallel

Data Bus

Comparator

ADS7842

CS

WR

BUSY

CLK

RD

CDAC

V

REF

4-Channel

MUX

AIN2

AIN1

AIN0

A0

A1

AIN3

ADS7842

SBAS103C – SEPTEMBER 2000 – REVISED OCTOBER 2006

www.ti.com

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.

Copyright © 2000-2006, Texas Instruments Incorporated

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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