®
ADC7802
Autocalibrating, 4-Channel, 12-Bit
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q
TOTAL UNADJUSTED ERROR
≤
1/2LSB
OVER FULL TEMPERATURE RANGE
q
FOUR-CHANNEL INPUT MULTIPLEXER
q
LOW POWER: 10mW plus Power Down
Mode
q
SINGLE SUPPLY: +5V
q
FAST CONVERSION TIME: 8.5
µ
s Including
Acquisition
q
AUTOCAL: No Offset or Gain Adjust
Required
q
UNIPOLAR INPUTS: 0V to 5V
q
MICROPROCESSOR-COMPATIBLE
INTERFACE
q
INTERNAL SAMPLE/HOLD
DESCRIPTION
The ADC7802 is a monolithic CMOS 12-bit A/D
converter with internal sample/hold and four-channel
multiplexer. An autocalibration cycle, occurring auto-
matically at power on, guarantees a total unadjusted
error within
±1/2LSB
over the specified temperature
range, eliminating the need for offset or gain adjust-
ment. The 5V single-supply requirements and stan-
dard CS, RD, and WR control signals make the part
very easy to use in microprocessor applications. Con-
version results are available in two bytes through an 8-
bit three-state output bus.
The ADC7802 is available in a 28-pin plastic DIP and
28-lead PLCC, fully specified for operation over the
industrial –40°C to +85°C temperature range.
A0
A1
Address
Latch and
Decoder
Calibration
Microcontroller
and Memory
Clock
Control
Logic
CS
RD
WR
SFR
AIN0
AIN1
AIN2
AIN3
Analog
Multiplexer
BUSY
Capacitor Array
Sampling ADC
Three-State
Input/Output
8-Bit
Data Bus
V
REF
+
V
REF
–
International Airport Industrial Park • Mailing Address: PO Box 11400
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP •
© 1990 Burr-Brown Corporation
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
PDS-1050B
Printed in U.S.A. June, 1993
BURR-BROWN [ BURR-BROWN CORPORATION ]
