ADC0834A, ADC0838A, ADC0834B, ADC0838B
A/D PERIPHERALS WITH SERIAL CONTROL
SLAS007 – AUGUST 1985 – REVISED OCTOBER 1986
AD0834 . . . N PACKAGE
(TOP VIEW)
• 8-Bit Resolution
• Easy Microprocessor Interface or Stand-
Alone Operation
V+
CS
V
DI
1
2
3
4
5
6
7
14
13
12
11
10
9
CC
• Operates Ratiometrically or With 5-V
Reference
CH0
CLK
• 4- or 8-Channel Multiplexer Options With
CH1
CH2
SARS
DO
Address Logic
• Shunt Regulator Allows Operation With
CH3
REF
High-Voltage Supplies
DGTL GND
ANLG GND
8
• Input Range 0 to 5 V With Single 5-V
ADC0838 . . . N PACKAGE
(TOP VIEW)
Supply
• Remote Operation With Serial Data Link
• Inputs and Outputs are Compatible With
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
V
CC
V+
CS
DI
CLK
SARS
DO
SE
REF
ANLG GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
TTL and MOS
• Conversion Time of 32 µs at
f
= 250 kHz
clock
• Designed to Be Interchangeable With
National Semiconductor ADC0834 and
ADC0838
TOTAL UNADJUSTED ERROR
DEVICE
A SUFFIX
± 1 LSB
± 1 LSB
B SUFFIX
± 1/2 LSB
± 1/2 LSB
DGTL GND
ADC0834
ADC0838
ADC0838 . . . FN PACKAGE
(TOP VIEW)
description
These devices are 8-bit successive- approxima-
tion analog-to-digital converters, each with an
input-configurable
multichannel
multi-
3
2
1
20 19
18
CS
CH3
CH4
CH5
CH6
CH7
4
5
6
7
8
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.
DI
17
16
15
14
CLK
SARS
DO
9 10 11 12 13
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.
Copyright 1986, 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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265