16-Bit 10

ANALOG-TO-DIGITAL CONVERTER

FEATURES

q 100kHz SAMPLING RATE

q 86dB SINAD WITH 20kHz INPUT

q

q DNL: 16 Bits No Missing Codes

q SIX SPECIFIED INPUT RANGES

q SERIAL OUTPUT

q SINGLE +5V SUPPLY OPERATION

q PIN-COMPATIBLE WITH 12-BIT ADS7808

q USES INTERNAL OR EXTERNAL

REFERENCE

q 100mW MAX POWER DISSIPATION

q 0.3" SO-20

q SIMPLE DSP INTERFACE

DESCRIPTION

The ADS7809 is a complete 16-bit sampling Analog-to-

Digital (A/D) converter using state-of-the-art CMOS struc-

tures. It contains a 16-bit capacitor-based Successive Ap-

proximation Register (SAR) A/D converter with sample-and-

hold, reference, clock, and a serial data interface. Data can

be outputted using the internal clock, or can be synchronized

to an external data clock. The ADS7809 also provides an

output synchronization pulse for ease of use with standard

DSP processors.

The ADS7809 is specified at a 100kHz sampling rate, and

specified over the full temperature range. Laser-trimmed

scaling resistors provide various input ranges including

±10V

and 0V to 5V, while an innovative design operates from a

single +5V supply, with power dissipation under 100mW.

The ADS7809 is available in a 0.3" SO-20, and is fully

specified for operation over the industrial –40

°C to +85°C

range.

10k

Ω

CDAC

4k

Ω

20k

Ω

5k

Ω

Internal

+2.5V Ref

Clock

BUSY

Data Clock

Serial Data

Successive Approximation Register and Control Logic

Serial

Data

Out

Comparator

Buffer

20k

Ω

R/C

CS

Power

Down

R1

IN

R2

IN

R3

IN

REF

CAP

ADS7809

SBAS017C – NOVEMBER 1996 – 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 © 1996-2006, 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.

All trademarks are the property of their respective owners.

ADS

7809