ADS5121

SBAS281 – MAY 2003

www.ti.com

DESCRIPTION

The ADS5121 is a low-power, 8-channel, 10-bit, 40MSPS

CMOS Analog-to-Digital Converter (ADC) that operates from

a single 1.8V supply, while offering 1.8V and 3.3V digital I/O

flexibility. A single-ended input clock is used for simultaneous

sampling of up to eight analog differential input channels. The

flexible duty cycle adjust circuit (DCASEL) allows the use of a

non-50% clock duty cycle. Individual standby pins allow users

the ability to power-down any number of ADCs.

The internal reference can be bypassed to use an external

reference to suit the accuracy and temperature drift require-

ments of the application. A 10-bit parallel bus on eight chan-

nels is provided with 3-state outputs.

The speed, resolution, and low power of the ADS5121 make

it ideal for applications requiring high-density signal process-

ing in low-power environments.

The ADS5121 is characterized for operation from –40

°C to

+85

°C.

FEATURES

q 8 DIFFERENTIAL ANALOG INPUTS

q 1V

q INT/EXT VOLTAGE REFERENCE

q ANALOG/DIGITAL SUPPLY: 1.8V

q DIGITAL I/O SUPPLY: 1.8V/3.3V

q DIFFERENTIAL NONLINEARITY:

q INTEGRAL NONLINEARITY:

q SIGNAL-TO-NOISE: 60dB at f

q POWER DISSIPATION: 500mW

q INDIVIDUAL CHANNEL POWER-DOWN

q 257-LEAD, 0.8 BALL PITCH, PLASTIC

MicroSTAR BGA™ (16mm • 16mm)

Copyright © 2003, Texas Instruments Incorporated

8-Channel, 10-Bit, 40MSPS, 1.8V

CMOS ANALOG-TO-DIGITAL CONVERTER

MicroSTAR BGA is a trademark of Texas Instruments. All other trademarks are the property of their respective owners.

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.

10-Bit

ADC

3-State

Output

Buffers

D[9:0]

A

10-Bit

ADC

3-State

Output

Buffers

D[9:0]

H

DCASEL

AINA+

CLK

AINA–

AINH–

AINH+

IREFR

AV

DD

STBY

OE

DRV

DD

DV

DD

Internal

Reference

Circuit

CM

AGND

DRVGND DGND

BG

PDREF REFT REFB

CML

APPLICATIONS

q PORTABLE ULTRASOUND

q PORTABLE INSTRUMENTATION

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.

ADS

5121