PDS-1154D

Printed in U.S.A., November, 1996

ADS7809

ADS7809

®

ADS7809

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

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 20-PIN 0.3" PLASTIC DIP AND SOIC

q SIMPLE DSP INTERFACE

DESCRIPTION

The ADS7809 is a complete 16-bit sampling analog-

to-digital using state-of-the-art CMOS structures. It

contains a 16-bit capacitor-based SAR A/D with S/H,

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

be output using the internal clock, or can be synchro-

nized 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 guaranteed 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 20-pin ADS7809 is available in a plastic 0.3" DIP

and in an SOIC, both 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

DEMO BOARD

AVAILABLE