ADC0831A, ADC0832A, ADC0831B, ADC0832B
A/D PERIPHERALS WITH SERIAL CONTROL
SLAS006 – AUGUST 1985 – REVISED JUNE 1986
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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
D
8-Bit Resolution
D
Easy Microprocessor interface or
Stand-Alone Operation
D
Operates Ratiometrically or With 5-V
Reference
D
Single Channel or Multiplexed Twin
Channels With Single-Ended or Differential
Input Options
D
Input Range 0 to 5 V With Single 5-V Supply
D
Inputs and Outputs Are Compatible With
TTL and MOS
D
Conversion Time of 32 µs at CLK = 250 kHz
D
Designed to Be interchangeable With
National Semiconductor ADC0831 and
ADC0832
DEVICE
TOTAL UNADJUSTED ERROR
DEVICE
A-SUFFIX B-SUFFIX
ADC0831 ± 1 LSB ± 1/2 LSB
ADC0832 ± 1 LSB ± 1/2 LSB
description
These devices are 8-bit successive-approximation analog-to-digital converters. The ADC0831A and
ADC0831B have single input channels; the ADC0832A and ADC0832B have multiplexed twin input channels.
The serial output is configured to interface with standard shift registers or microprocessors. Detailed information
on interfacing to most popular microprocessors is readily available from the factory.
The ADC0832 multiplexer is software configured for single-ended or differential inputs. The differential analog
voltage input allows for common-mode rejection or offset of the analog zero input voltage value. In addition,
the voltage reference input can be adjusted to allow encoding any smaller analog voltage span to the full 8 bits
of resolution.
The operation of the ADC0831 and ADC0832 devices is very similar to the more complex ADC0834 and
ADC0838 devices. Ratiometric conversion can be attained by setting the REF input equal to the maximum
analog input signal value, which gives the highest possible conversion resolution. Typically, REF is set equal
to V
CC
(done internally on the ADC0832). For more detail on the operation of the ADC0831 and ADC0832
devices, refer to the ADC0834/A DC0838 data sheet.
The ADC0831AC, ADC0831BC, ADC0832AC, and ADC0832BC are characterized for operation from 0°C
to 70°C. The ADC0831AI, ADC0831BI, ADC0832AI, and ADC0832BI are characterized for operation from
–40°C to 85°C.
Copyright 1996, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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CS
IN+
IN–
GND
V
CC
CLK
DO
REF
ADC0831 . . . P PACKAGE
(TOP VIEW)
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4
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5
CS
CH0
CH1
GND
V
CC
/REF
CLK
DO
DI
ADC0832 . . . P PACKAGE
(TOP VIEW)
