ADC674 Datasheet, PDF (1/6 Pages) Burr-Brown (TI) – Microprocessor-Compatible ANALOG-TO-DIGITAL CONVERTER

®
ADC674A
Microprocessor-Compatible
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q COMPLETE 12-BIT A/D CONVERTER
WITH REFERENCE, CLOCK, AND 8-, 12-,
OR 16-BIT MICROPROCESSOR BUS
INTERFACE
q IMPROVED PERFORMANCE SECOND
SOURCE FOR ADC574A/674A-TYPE A/D
CONVERTERS
Conversion Time: 15µs max
Bus Access Time:150ns max
A₀ Input: Bus Contention During Read
Operation Eliminated
q FULLY SPECIFIED FOR OPERATION ON
±12V OR ±15V SUPPLIES
q NO MISSING CODES OVER
TEMPERATURE:
0°C to +75°C ADC674AJH, KH, JP, KP
Grades
–55°C to +125°C (ADC674ASH, TH Grades)
DESCRIPTION
The ADC674A is a 12-bit successive approximation
analog-to-digital converter, utilizing state-of-the-art
CMOS and laser-trimmed bipolar die custom-designed
for freedom from latch-up and for optimum AC per-
formance. It is complete with a self-contained +10V
reference, internal clock, digital interface for micro-
processor control, and three-state outputs.
The reference circuit, containing a buried zener, is
laser-trimmed for minimum temperature coefficient.
The clock oscillator is current-controlled for excel-
lent stability over temperature. Full-scale and offset
errors may be externally trimmed to zero. Internal
scaling resistors are provided for the selection of
analog input signal ranges of 0V to +10V, 0V to
+20V, ±5V, and ±10V.
The converter may be externally programmed to
provide 8- or 12-bit resolution. The conversion time
for 12 bits is factory set for 15µs maximum.
Output data are available in a parallel format from
TTL-compatible three-state output buffers. Output data
are coded in straight binary for unipolar input signals
and bipolar offset binary for bipolar input signals.
The ADC674A, available in both industrial and
military temperature ranges, requires supply voltages
of +5V and ±12V or ±15V. It is packaged in a 28-pin
plastic DIP, or hermetic side-brazed ceramic DIP.
Control
Inputs
Control
Logic
Status
Bipolar
Offset
20V Range
10V Range
Reference
Input
Reference
Output
Clock
Comparator
12-Bit D/A
Converter
10V
Reference
Parallel
Data
Output
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©_{1984 Burr-Brown Corporation}
PDS-551D
Printed in U.S.A. October, 1993