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Teilenummer | ADC0803 |
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Beschreibung | 8-Bit uP Compatible A/D Converters | |
Hersteller | National Semiconductor | |
Logo | ||
Gesamt 30 Seiten 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 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 VDC, 2.5 VDC, or
analog span adjusted voltage reference
Key Specifications
n Resolution
n Total error
n Conversion time
8 bits
±1⁄4 LSB, ±1⁄2 LSB and ±1 LSB
100 µs
Connection Diagram
ADC080X
Dual-In-Line and Small Outline (SO) Packages
Ordering Information
TEMP RANGE
±1⁄4 Bit Adjusted
ERROR
±1⁄2 Bit Unadjusted
±1⁄2 Bit Adjusted
±1Bit Unadjusted
PACKAGE OUTLINE
DS005671-30
See Ordering Information
0˚C TO 70˚C
ADC0802LCWM
ADC0804LCWM
M20B — Small
Outline
0˚C TO 70˚C
−40˚C TO +85˚C
ADC0801LCN
ADC0802LCN
ADC0803LCN
ADC0804LCN
ADC0805LCN/ADC0804LCJ
N20A — Molded DIP
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
TRI-STATE Test Circuits and Waveforms
t1H
t1H, CL=10 pF
t0H
DS005671-47
tr=20 ns
DS005671-48
t0H, CL=10 pF
DS005671-49
tr=20 ns
Timing Diagrams (All timing is measured from the 50% voltage points)
DS005671-50
www.national.com
6
DS005671-51
6 Page Typical Applications (Continued)
Handling ±10V Analog Inputs
Low-Cost, µP Interfaced, Temperature-to-Digital
Converter
*Beckman Instruments #694-3-R10K resistor array
DS005671-70
µP Interfaced Temperature-to-Digital Converter
DS005671-71
*Circuit values shown are for 0˚C≤TA≤+128˚C
***Can calibrate each sensor to allow easy replacement, then A/D can be calibrated with a pre-set input voltage.
DS005671-72
www.national.com
12
12 Page | ||
Seiten | Gesamt 30 Seiten | |
PDF Download | [ ADC0803 Schematic.PDF ] |
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