Document
ADC0801/ADC0802/ADC0803/ADC0804/ADC0805 8-Bit µP Compatible A/D Converters
November 1999
ADC0801/ADC0802/ADC0803/ADC0804/ADC0805 8-Bit µP 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 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. 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. n Differential analog voltage inputs n Logic inputs and outputs meet both MOS and TTL voltage level specifications n Works with 2.5V (LM336) voltage reference n On-chip clock generator n 0V to 5V analog input voltage range with single 5V supply n No zero adjust required n 0.3" standard width 20-pin DIP package n 20-pin molded chip carrier or small outline package n Operates ratiometrically or with 5 VDC, 2.5 VDC, or analog span adjusted voltage reference
Key Specifications
n Resolution n Total error n Conversion time 8 bits
Features
n Compatible with 8080 µP derivatives — no interfacing logic needed - access time - 135 ns n Easy interface to all microprocessors, or operates “stand alone”
± 1⁄4 LSB, ± 1⁄2 LSB and ± 1 LSB
100 µs
Connection Diagram
ADC080X Dual-In-Line and Small Outline (SO) Packages
DS005671-30
See Ordering Information
Ordering Information
TEMP RANGE ERROR 0˚C TO 70˚C ADC0802LCWM ADC0804LCWM M20B — Small Outline ADC0804LCN 0˚C TO 70˚C −40˚C TO +85˚C ADC0801LCN ADC0802LCN ADC0803LCN ADC0805LCN/ADC0804LCJ N20A — Molded DIP
± 1⁄4 Bit Adjusted ± 1⁄2 Bit Unadjusted ± 1⁄2 Bit Adjusted ± 1Bit Unadjusted
PACKAGE OUTLINE
TRI-STATE ® is a registered trademark of National Semiconductor Corp. Z-80 ® is a registered trademark of Zilog Corp.
© 1999 National Semiconductor Corporation
DS005671
www.national.com
ADC0801/ADC0802/ADC0803/ADC0804/ADC0805
Typical Applications
DS005671-1
8080 Interface
DS005671-31
Error Specification (Includes Full-Scale, Part Number ADC0801 ADC0802 ADC0803 ADC0804 ADC0805 FullScale Adjusted Zero Error, and Non-Linearity) VREF/2 = 2.500 VDC VREF/2 = No Connection (No Adjustments) (No Adjustments)
± 1⁄4 LSB ± 1⁄2 LSB ± 1⁄2 LSB ± 1 LSB ± 1 LSB
www.national.com
2
ADC0801/ADC0802/ADC0803/ADC0804/ADC0805
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) (Note 3) Voltage Logic Control Inputs At Other Input and Outputs Lead Temp. (Soldering,.