ADS7803 Datasheet, PDF (1/13 Pages) Burr-Brown (TI) – Autocalibrating, 4-Channel, 12-Bit ANALOG-TO-DIGITAL CONVERTER

®
ADS7803
Autocalibrating, 4-Channel, 12-Bit
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q LOW POWER: 10mW plus Power Down
q SIGNAL-TO-(NOISE + DISTORTION)
RATIO OVER TEMPERATURE:
69dB min with f_IN = 1kHz
66dB min with f_IN = 50kHz
q FAST CONVERSION TIME: 8.5µs
Including Acquisition (117kHz Sampling
Rate)
q DC PERFORMANCE OVER
TEMPERATURE:
±3/4 LSB max Total Error
±1/4 LSB max Channel Mismatch
q FOUR-CHANNEL INPUT MULTIPLEXER
q SINGLE SUPPLY: +5V
q PIN COMPATIBLE WITH ADC7802
DESCRIPTION
The ADS7803 is a monolithic CMOS 12-bit analog-
to-digital converter with internal sample/hold and four-
channel multiplexer. It is designed and tested for full
dynamic performance with input signals to 50kHz. An
autocalibration cycle guarantees a total unadjusted
error within ±3/4LSB 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
easy to use in microprocessor applications. Conver-
sion results are available in two bytes through an 8-bit
three-state output bus.
The ADS7803 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
Address
Calibration
Latch and
Microcontroller
A1
Decoder
and Memory
Clock
Control
Logic
CS
RD
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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Tel: [phone] • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
©_{1991 Burr-Brown Corporation}
PDS-1126A
Printed in U.S.A. August, 1993