ADC0802, ADC0803
ADC0804
8-Bit, MicroprocessorCompatible, A/D Converters
August 1997
Features
Description
• 80C48 and 80C80/85 Bus Compatible - No Interfacing
Logic Required
The ADC0802 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.
• 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 commonmode-rejection and permits offsetting the analog zero-inputvoltage 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
• 0V to 5V Analog Voltage Input Range (Single + 5V Supply)
• No Zero-Adjust Required
Ordering Information
PART NUMBER
ERROR
ADC0802LCN
±1/2 LSB
ADC0802LCD
TEMP. RANGE (oC)
EXTERNAL CONDITIONS
±3/4 LSB
±1 LSB
ADC0802LD
ADC0803LCN
±1/2 LSB
ADC0803LCD
±3/4 LSB
VREF/2 = 2.500VDC (No Adjustments)
0 to 70
PACKAGE
PKG. NO
20 Ld PDIP
E20.3
-40 to 85
20 Ld CERDIP
F20.3
-55 to 125
20 Ld CERDIP
F20.3
20 Ld PDIP
E20.3
-40 to 85
20 Ld CERDIP
F20.3
VREF/2 Adjusted for Correct Full Scale
Reading
0 to 70
ADC0803LCWM
±1 LSB
-40 to 85
20 Ld SOIC
M20.3
ADC0803LD
±1 LSB
-55 to 125
20 Ld CERDIP
F20.3
ADC0804LCN
±1 LSB
20 Ld PDIP
E20.3
ADC0804LCD
±1 LSB
-40 to 85
20 Ld CERDIP
F20.3
ADC0804LCWM
±1 LSB
-40 to 85
20 Ld SOIC
M20.3
VREF/2 = 2.500VDC (No Adjustments)
Pinout
0 to 70
Typical Application Schematic
ADC0802, ADC0803, ADC0804
(PDIP, CERDIP)
TOP VIEW
1
CS
2
RD
V+ 20
CLK R 19
3
WR
CLK IN
4
5
INTR
11
DB7
DB4
VIN (+)
6
DB3
VIN (-)
1
20 V+ OR VREF
RD
2
19 CLK R
WR
3
18 DB0 (LSB)
CLK IN
4
17 DB1
INTR
5
16 DB2
15
VIN (+)
6
15 DB3
16
VIN (-)
7
14 DB4
17
AGND
8
13 DB5
18
VREF/2
9
150pF
10K
12 DB6
DGND 10
ANY
µPROCESSOR
µP BUS
CS
+5V
12
13
14
DB6
DB5
DB2
DB1
DB0
7
AGND 8
VREF/2 9
DGND 10
DIFF
INPUTS
8-BIT RESOLUTION
OVER ANY
DESIRED
ANALOG INPUT
VOLTAGE RANGE
VREF/2
11 DB7 (MSB)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999
6-5
File Number
3094.1
