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.
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
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.
• Works with Bandgap Voltage References
• TTL Compatible Inputs and Outputs
• On-Chip Clock Generator
• Analog Voltage Input Range
(Single + 5V Supply) . . . . . . . . . . . . . . . . . . . . . . 0V to 5V
Typical Application Schematic
• No Zero-Adjust Required
• 80C48 and 80C80/85 Bus Compatible - No Interfacing
Logic Required
1
2
3
20
19
4
CS
RD
WR
INTR
DB
DB
DB
DB
DB
DB
DB
DB
V+
CLK R
CLK IN
+5V
150pF
Pinout
10K
ADC0803, ADC0804
(PDIP)
5
11
12
13
14
15
16
17
18
7
6
5
4
3
2
1
0
TOP VIEW
ANY
µPROCESSOR
6
7
8
9
10
1
2
3
4
5
6
7
8
9
V+ OR V
V
V
(+)
(-)
20
CS
RD
IN
IN
REF
DIFF
INPUTS
19
18
CLK R
DB
AGND
WR
0 (LSB)
V
/2
V
/2
REF
REF
17 DB
16 DB
15 DB
14 DB
CLK IN
INTR
1
DGND
2
V
(+)
(-)
IN
3
V
IN
4
8-BIT RESOLUTION
OVER ANY
13
12
DB
DB
AGND
/2
5
V
DESIRED
REF
6
ANALOG INPUT
VOLTAGE RANGE
DGND 10
11 DB
7 (MSB)
Ordering Information
o
PART NUMBER
ERROR
EXTERNAL CONDITIONS
TEMP. RANGE ( C)
PACKAGE
PKG. NO
E20.3
1
ADC0803LCN
± / LSB
V
/2 Adjusted for Correct Full Scale
REF
0 to 70
20 Ld PDIP
2
Reading
ADC0804LCN
±1 LSB
V
/2 = 2.500V
REF
(No Adjustments)
0 to 70
20 Ld PDIP
E20.3
DC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright © Intersil Americas Inc. 2002. All Rights Reserved
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