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 di-
rectly driving the data bus. These A/Ds appear like memory
locations or I/O ports to the microprocessor and no interfac-
ing 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
n Compatible with 8080 µP derivatives — no interfacing
logic needed - access time - 135 ns
n Easy interface to all microprocessors, or operates “stand
alone”
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 V
DC
, 2.5 V
DC
,or
analog span adjusted voltage reference
Key Specifications
n Resolution 8 bits
n Total error
±
1
⁄
4
LSB,
±
1
⁄
2
LSB and
±
1 LSB
n Conversion time 100 µs
Connection Diagram
Ordering Information
TEMP RANGE 0˚C TO 70˚C 0˚C TO 70˚C −40˚C TO +85˚C
±
1
⁄
4
Bit Adjusted ADC0801LCN
ERROR
±
1
⁄
2
Bit Unadjusted ADC0802LCWM ADC0802LCN
±
1
⁄
2
Bit Adjusted ADC0803LCN
±
1Bit Unadjusted ADC0804LCWM ADC0804LCN ADC0805LCN/ADC0804LCJ
PACKAGE OUTLINE M20B— Small
Outline
N20A— Molded DIP
TRI-STATE
®
is a registered trademark of National Semiconductor Corp.
Z-80
®
is a registered trademark of Zilog Corp.
ADC080X
Dual-In-Line and Small Outline (SO) Packages
DS005671-30
See Ordering Information
November 1999
ADC0801/ADC0802/ADC0803/ADC0804/ADC0805 8-Bit µP Compatible A/D Converters
© 1999 National Semiconductor Corporation DS005671 www.national.com
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