A/D PERIPHERALS - Texas Instruments
Description
ADC0834A, ADC0838A, ADC0834B, ADC0838B A/D PERIPHERALS WITH SERIAL CONTROL
SLAS007 – AUGUST 1985 – REVISED OCTOBER 1986
• 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
fclock = 250 kHz
• Designed to Be Interchangeable With
National Semiconductor ADC0834 and
ADC0838
DEVICE
ADC0834 ADC0838
TOTAL UNADJUSTED ERROR
A SUFFIX
B SUFFIX
± 1 LSB
± 1/2 LSB
± 1 LSB
± 1/2 LSB
description
AD0834 .
.
.
N PACKAGE (TOP VIEW)
V+ CS CH0 CH1 CH2 CH3 DGTL GND
1 2 3 4 5 6 7
14 VCC 13 DI 12 CLK 11 SARS 10 DO 9 REF 8 ANLG GND
ADC0838 .
.
.
N PACKAGE (TOP VIEW)
CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM DGTL GND
1 2 3 4 5 6 7 8 9 10
20 VCC 19 V + 18 CS 17 DI 16 CLK 15 SARS 14 DO 13 SE 12 REF 11 ANLG GND
ADC0838 .
.
.
FN PACKAGE (TOP VIEW)
CH2 CH1 CH0 VCC V+
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 differential analog voltage input allows for commonmode 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.
COM DGTL GND ANLG GND
REF SE
CH3 CH4 CH5 CH6 CH7
...
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