adc0800pd National Semiconductor Corporation, adc0800pd Datasheet - Page 5

• Manufacturer Part Number: adc0800pd
• Description: 8-bit A/d Converter
• Manufacturer: National Semiconductor Corporation

Application Hints
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
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
Hi-Voltage CMOS Output Levels
General Connection
(Continued)
TL H 5670 – 11
TL H 5670 – 12
LSB (20
0V to 10V V
0V to 10V output levels
IN
5
range
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
from full-scale (60 mV less than full-scale for a 10 24V
scale) This voltage is guaranteed to be within
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
g
TL H 5670 – 4
2 LSB for
LSB