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PDF ADC0800 Data sheet ( Hoja de datos )

Número de pieza ADC0800
Descripción ADC0800 8-Bit A/D Converter
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! ADC0800 Hoja de datos, Descripción, Manual

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 C to a125 C and
the ADC0800PCD is specified over 0 C to 70 C
Block Diagram
Features
Y Low cost
Y g5V 10V input ranges
Y No missing codes
Y Ratiometric conversion
Y TRI-STATE outputs
Y Fast
Y Contains output latches
Y TTL compatible
Y Supply voltages
Y Resolution
Y Linearity
Y Conversion speed
Y Clock range
February 1995
TCe50 ms
5 VDC and b12 VDC
8 bits
g1 LSB
40 clock periods
50 to 800 kHz
(00000000e afull-scale)
TRI-STATE is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation TL H 5670
TL H 5670 – 1
RRD-B30M115 Printed in U S A

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ADC0800 pdf
Application Hints (Continued)
ZERO AND FULL-SCALE ADJUSTMENT
Zero Adjustment This is the offset voltage required at the
bottom of the R-network (pin 5) to make the 11111111 to
11111110 transition when the input voltage is LSB (20
mV for a 10 24V scale) In most cases this can be accom-
plished by having a 1 kX pot on pin 5 A resistor of 475X
can be used as a non-adjustable best approximation from
pin 5 to ground
Typical Applications
General Connection
Full-Scale Adjustment This is the offset voltage required
at the top of the R-network (pin 15) to make the 00000001
to 00000000 transition when the input voltage is 1 LSB
from full-scale (60 mV less than full-scale for a 10 24V
scale) This voltage is guaranteed to be within g2 LSB for
the ADC0800 without adjustment In most cases adjust-
ment can be accomplished by having a 1 kX pot on pin 15
Ratiometric Input Signal with Tracking Reference
TL H 5670 – 11
Hi-Voltage CMOS Output Levels
0V to 10V VIN range
0V to 10V output levels
TL H 5670 – 12
TL H 5670 – 4
5

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