ADC0801/ADC0802/ADC0803/ADC0804/ADC0805
8-Bit mP Compatible A/D Converters
General Description
The ADC0801, ADC0802, ADC0803, ADC0804 and
ADC0805 are CMOS 8-bit successive approximation A/D
converters that use a differential potentiometric ladderÐ
similar to the 256R products. These converters are designed to allow operation with the NSC800 and INS8080A
derivative control bus with TRI-STATEÉ 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.
Differential analog voltage inputs allow increasing the common-mode rejection and 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
Y Compatible with 8080 mP derivativesÐno interfacing
logic needed - access time - 135 ns
Y Easy interface to all microprocessors, or operates
‘‘stand alone’’
Y Differential analog voltage inputs
Y Logic inputs and outputs meet both MOS and TTL voltage level specifications
Y Works with 2.5V (LM336) voltage reference
Y On-chip clock generator
Y 0V to 5V analog input voltage range with single 5V
supply
Y No zero adjust required
Y 0.3× standard width 20-pin DIP package
Y 20-pin molded chip carrier or small outline package
Y Operates ratiometrically or with 5 VDC, 2.5 VDC, or analog span adjusted voltage reference
Key Specifications
Y Resolution 8 bits
Y Total error g(/4 LSB, g(/2 LSB and g1 LSB
Y Conversion time 100 ms