Rainbow Electronics АDC0805 - Manual

TL H 5671
ADC0801ADC0802ADC0803ADC0804ADC0805 8-Bit
m
P
Compatible
AD
Converters
December 1994
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 ladder
similar to the 256R products These converters are de-
signed 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 inter-
facing logic is needed
Differential analog voltage inputs allow increasing the com-
mon-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 derivatives no 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 volt-
age 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 V
DC
2 5 V
DC
or ana-
log span adjusted voltage reference
Key Specifications
Y Resolution 8 bits
Y Total error g LSB g LSB and g 1 LSB
Y Conversion time 100 ms
Typical Applications
TL H 5671 – 1
8080 Interface
TL H 5671 – 31
Error Specification (Includes Full-Scale
Zero Error and Non-Linearity)
Part
Full-
V REF 2e2 500 V DC V REF 2eNo Connection
Number
Scale
(No Adjustments) (No Adjustments)
Adjusted
ADC0801 g LSB
ADC0802 g LSB
ADC0803 g LSB
ADC0804 g 1 LSB
ADC0805 g 1 LSB
TRI-STATE is a registered trademark of National Semiconductor Corp
Z-80 is a registered trademark of Zilog Corp
C1995 National Semiconductor Corporation RRD-B30M115 Printed in U S A