®
ADS7820
1
FEATURES
l 100kHz min SAMPLING RATE
l 0 to +5V INPUT RANGE
l 72dB min SINAD WITH 45kHz INPUT
l ±1/2 LSB max INL AND DNL
l SINGLE +5V SUPPLY OPERATION
l PIN-COMPATIBLE WITH 16-BIT ADS7821
l USES INTERNAL OR EXTERNAL
REFERENCE
l COMPLETE WITH S/H, REF, CLOCK, ETC.
l FULL PARALLEL DATA OUTPUT
l 100mW max POWER DISSIPATION
l 28-PIN 0.3" PLASTIC DIP AND SOIC
ADS7820
DESCRIPTION
The ADS7820 is a complete 12-bit sampling A/D
using state-of-the-art CMOS structures. It contains a
complete 12-bit, capacitor-based SAR A/D with S/H,
reference, clock, interface for microprocessor use, and
three-state output drivers.
The ADS7820 is specified at a 100kHz sampling rate,
and guaranteed over the full temperature range. Laser-
trimmed scaling resistors provide a 0 to +5V input
range, with power dissipation under 100mW.
The 28-pin ADS7820 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.
12-Bit 10µs Sampling CMOS
ANALOG-to-DIGITAL CONVERTER
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 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
®
Successive Approximation Register and Control Logic
Clock
Output
Latches
and
Three
State
Drivers
Three
State
Parallel
Data
Bus
BUSY
Comparator
BYTE
CS
R/C
CDAC
Internal
+2.5V Ref
Buffer
4kΩ
0 to +5V Input
REF
CAP
5kΩ
20kΩ6.66kΩ
ADS7820
ADS7820
©
1996 Burr-Brown Corporation PDS-1322 Printed in U.S.A. June, 1996