ADC7802 Datasheet, PDF (1/13 Pages) Burr-Brown (TI) – Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER

®
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: 8.5µs 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.
CS
A0
Address
Latch and
Calibration
Microcontroller
Clock
Control
RD
A1
Decoder
and Memory
Logic
WR
SFR
AIN0
AIN1
AIN2
AIN3
Analog
Multiplexer
Capacitor Array
Sampling ADC
V_REF +
V_REF –
Three-State
Input/Output
BUSY
8-Bit
Data Bus
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© 1990 Burr-Brown Corporation
PDS-1050B
Printed in U.S.A. June, 1993