DAC1208 National Semiconductor, DAC1208 Datasheet - Page 14

• Manufacturer Part Number: DAC1208
• Description: 12-Bit/ uP Compatible/ Double-Buffered D to A Converters
• Manufacturer: National Semiconductor

Application Hints
2 2 1 Zero and Full-Scale Adjustments
To calibrate the bipolar output circuit three adjustments are
required The first step is to set all of the digital inputs LOW
(to force I
setting the voltage at its inverting input (pin 2) to zero volts
Next with a code of all zeros still applied adjust ‘‘
scale adjust’’ the reference voltage for V
eal
opposite that of the applied reference Finally set all of the
digital inputs HIGH and adjust ‘‘
l
The polarity of the output voltage at this time will be
OUT1
to 0) then null the V
V
OUT
V
Composite Amplifier for Good DC Characteristics and Fast Output Response
OUT
e
e
Combines the low V
low V
bias current of the
LM11 with the fast
response of the LF351
Settling time
for a zero to full-
scale transition
(Continued)
b
V
4096
REF
V
REF
OS
D
2047
2048
a
drift and low
full-scale adjust’’ for
1
OS
a
8 S
R
OUT
R2
of amplifier 1 by
Fb
OS
a
e
R2
R1
g
High Voltage Power DAC
l
V
REF
b
full-
id-
14
The polarity of the output will be the same as that of the
reference voltage
3 0 APPLICATION IDEAS
In this section the digital input word is represented by the
letter D and is equal to the decimal equivalent of the 12-bit
binary input Hence D can be any integer value between 0
and 4095
TL H 5690 – 17