ADC0803LCN 8-bit A/D Converter

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The ADC0803 is CMOS 8-bit successive approximation A/D converters that use a differential potentiometric ladder similar to the 256R products. These converters are designed to allow operation with the NSC800 and INS8080A derivative control bus with TRI-STATE output latches directly driving the data bus. These A/Ds appear like memory locations or I/O ports to the microprocessor and no interfacing logic is needed.

ADC0803LCN Pinout

ADC0803LCN Pin Configuration

Pin Number	Pin Name	Description
1	CS’	Chip Select (Active Low)
2	RD’	Read (Active Low)
3	WR’	Write (Active Low)
4	CLK IN	Clock In
5	INTR’	Interrupt (Active Low)
6	Vin+	Analog Voltage Input
7	Vin-	Analog Voltage Input
8	AGND	Analog Ground
9	Vref/2	Voltage Reference/2
10	DGND	Digital Ground
11	DB7	Data Bit 7
12	DB6	Data Bit 6
13	DB5	Data Bit 5
14	DB4	Data Bit 4
15	DB3	Data Bit 3
16	DB2	Data Bit 2
17	DB1	Data Bit 1
18	DB0	Data Bit 0
19	CLKR	Clock Reset
20	Vcc	Positive Supply

ADC0803LCN Features

Compatible with 8080 µP derivatives — no interfacing logic needed – access time – 135 ns
Easy interface to all microprocessors, or operates “stand alone”
Differential analog voltage inputs
Logic inputs and outputs meet both MOS and TTL voltage level specifications
Works with 2.5V (LM336) voltage reference
On-chip clock generator
0V to 5V analog input voltage range with single 5V supply
No zero adjust required
0.3″ standard width 20-pin DIP package
20-pin molded chip carrier or small outline package