TL/H/5670
ADC0800
8-Bit
A/D
Converter
February 1995
ADC0800 8-Bit A/D Converter
General Description
The ADC0800 is an 8-bit monolithic A/D converter using P-
channel ion-implanted MOS technology. It contains a high
input impedance comparator, 256 series resistors and ana-
log switches, control logic and output latches. Conversion is
performed using a successive approximation technique
where the unknown analog voltage is compared to the re-
sistor tie points using analog switches. When the appropri-
ate tie point voltage matches the unknown voltage, conver-
sion is complete and the digital outputs contain an 8-bit
complementary binary word corresponding to the unknown.
The binary output is TRI-STATE to permit bussing on com-
mon data lines.
The ADC0800PD is specified over b55§Ctoa125§C and
the ADC0800PCD is specified over 0§Cto70§C.
Features
Y
Low cost
Y
g5V, 10V input ranges
Y
No missing codes
Y
Ratiometric conversion
Y
TRI-STATE outputs
Y
Fast T
C
e50 ms
Y
Contains output latches
Y
TTL compatible
Y
Supply voltages 5 V
DC
and b12 V
DC
Y
Resolution 8 bits
Y
Linearity g1 LSB
Y
Conversion speed 40 clock periods
Y
Clock range 50 to 800 kHz
Block Diagram
TL/H/5670–1
(00000000eafull-scale)
TRI-STATE is a registered trademark of National Semiconductor Corp.
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.