®
ADC0803, ADC0804
Data Sheet
August 2002
FN3094.4
8-Bit, Microprocessor-Compatible, A/D
Converters
The ADC080X family are CMOS 8-Bit, successive-
approximation A/D converters which use a modified
potentiometric ladder and are designed to operate with the
8080A control bus via three-state outputs. These converters
appear to the processor as memory locations or I/O ports,
and hence no interfacing logic is required.
The differential analog voltage input has good common-
mode-rejection and permits offsetting 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.
Features
• 80C48 and 80C80/85 Bus Compatible - No Interfacing
Logic Required
• Conversion Time . . . . . . . . . . . . . . . . . . . . . . . . . . <100µs
• Easy Interface to Most Microprocessors
• Will Operate in a “Stand Alone” Mode
• Differential Analog Voltage Inputs
• Works with Bandgap Voltage References
• TTL Compatible Inputs and Outputs
• On-Chip Clock Generator
• Analog Voltage Input Range
(Single + 5V Supply) . . . . . . . . . . . . . . . . . . . . . . 0V to 5V
• No Zero-Adjust Required
• 80C48 and 80C80/85 Bus Compatible - No Interfacing
Logic Required
Typical Application Schematic
1
2
3
5
11
µP
BUS
ANY
µPROCESSOR
12
13
14
15
16
17
18
CS
RD
WR
INTR
DB
7
DB
6
DB
5
DB
4
DB
3
DB
2
DB
1
DB
0
V+ 20 +5V 150pF
CLK R 19
CLK IN 4 10K
Pinout
ADC0803, ADC0804
(PDIP)
TOP VIEW
V
IN
(+) 6
V (-) 7
AGND 8
/2 9
V
DGND 10
REF
IN
DIFF
INPUTS
V
REF
/2
CS
RD
WR
CLK IN
INTR
V
IN
(+)
V
IN
(-)
1
2
3
4
5
6
7
8
9
20 V+ OR V
REF
19 CLK R
18 DB
0 (LSB)
17 DB
1
16 DB
2
15 DB
3
14 DB
4
13 DB
5
12 DB
6
11 DB
7 (MSB)
8-BIT RESOLUTION
OVER ANY
DESIRED
ANALOG INPUT
VOLTAGE RANGE
AGND
V
REF
/2
DGND 10
Ordering Information
PART NUMBER
ADC0803LCN
ADC0804LCN
ERROR
±
1
/
2
LSB
±
1 LSB
EXTERNAL CONDITIONS
V
REF
/2 Adjusted for Correct Full Scale
Reading
V
REF
/2 = 2.500V
DC
(No Adjustments)
TEMP. RANGE (
o
C)
0 to 70
0 to 70
PACKAGE
20 Ld PDIP
20 Ld PDIP
PKG. NO
E20.3
E20.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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