Low-Power 12-Bit Sampling CMOS
ANALOG-to-DIGITAL CONVERTER
DESCRIPTION
The ADS7806 is a low-power 12-bit sampling analog-
to-digital using state-of-the-art CMOS structures. It
contains a complete 12-bit, capacitor-based, SAR A/D
with S/H, clock, reference, and microprocessor inter-
face with parallel and serial output drivers.
The ADS7806 can acquire and convert to full 12-bit
accuracy in 25µs max while consuming only 35mW
max. Laser-trimmed scaling resistors provide standard
industrial input ranges of ±10V and 0V to +5V. In
addition, a 0V to +4V range allows development of
complete single supply systems.
The 28-pin ADS7806 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 temperature range.
CDAC
6kΩ
40kΩ
10kΩ
BUSY
Parallel
and
Serial
Data
Out
Comparator
Buffer
20kΩ
R1
IN


R2
IN
REF
Successive Approximation Register and Control Logic
Clock
Power
Down
BYTE
CS
R/C
40kΩ
Internal
+2.5V Ref
Reference
Power
Down
Serial Data
Clock
Parallel Data
CAP
Serial Data
8
FEATURES
l 35mW max POWER DISSIPATION
l 50µW POWER DOWN MODE
l 25µs max ACQUISITION AND
CONVERSION
l ±1/2LSB max INL AND DNL
l 72dB min SINAD WITH 1kHz INPUT
l ±10V, 0V TO +5V, AND 0V TO +4V INPUT
RANGES
l SINGLE +5V SUPPLY OPERATION
l PARALLEL AND SERIAL DATA OUTPUT
l PIN-COMPATIBLE WITH 16-BIT ADS7807
l USES INTERNAL OR EXTERNAL
REFERENCE
l 28-PIN 0.3" PLASTIC DIP AND SOIC
ADS7806
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
®
©
1992 Burr-Brown Corporation PDS-1158C Printed in U.S.A. November, 1994