ADC0834A, ADC0838A, ADC0834B, ADC0838B
A/D PERIPHERALS WITH SERIAL CONTROL

SLAS007 – AUGUST 1985 – REVISED OCTOBER 1986
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright  1986, Texas Instruments Incorporated
1
• 8-Bit Resolution
• Easy Microprocessor Interface or Stand-
Alone Operation
• Operates Ratiometrically or With 5-V
Reference
• 4- or 8-Channel Multiplexer Options With
Address Logic
• Shunt Regulator Allows Operation With
High-Voltage Supplies
• Input Range 0 to 5 V With Single 5-V
Supply
• Remote Operation With Serial Data Link
• Inputs and Outputs are Compatible With
TTL and MOS
• Conversion Time of 32 µs at
f
clock
= 250 kHz
• Designed to Be Interchangeable With
National Semiconductor ADC0834 and
ADC0838
DEVICE
TOTAL UNADJUSTED ERROR
A SUFFIX B SUFFIX
ADC0834 ± 1 LSB ± 1/2 LSB
ADC0838 ± 1 LSB ± 1/2 LSB

description
These devices are 8-bit successive- approxima-
tion analog-to-digital converters, each with an
input-configurable multichannel multi-
plexer and serial input/output. The serial input/
output is configured to interface with standard shift
registers or microprocessors. Detailed informa-
tion on interfacing with most popular microproces-
sors is readily available from the factory.
The ADC0834 (4-channel) and ADC0838
(8-channel) multiplexer is software configured
forsingle-ended or differential inputs as well as
pseudo-differential input assignments. The differ-
ential 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 ADC0834AC, ADC0834BC, ADC0838AC, and ADC0838BC are characterized for operation from 0°C to
70°C. The ADC0834AI, ADC0834BI, ADC0838AI, and ADC0838BI are characterized for operation from –40°C
to 85°C.
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V+
CS
CH0
CH1
CH2
CH3
DGTL GND
V
CC
DI
CLK
SARS
DO
REF
ANLG GND
AD0834 . . . N PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
DGTL GND
V
CC
V+
CS
DI
CLK
SARS
DO
SE
REF
ANLG GND
ADC0838 . . . N PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
CS
DI
CLK
SARS
DO
CH3
CH4
CH5
CH6
CH7
ADC0838 . . . FN PACKAGE
(TOP VIEW)
CH2 CH1 CH0
REF
SE
V V+
COM
DGTL
GND
ANLG GND
CC
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.