dac0830-mwc National Semiconductor Corporation, dac0830-mwc Datasheet - Page 14

• Manufacturer Part Number: dac0830-mwc
• Description: 8-bit ?p Compatible, Double-buffered D To A Converters
• Manufacturer: National Semiconductor Corporation

www.national.com
DAC0830 Series Application Hints
2.5 Zero Adjustment
For accurate conversions, the input offset voltage of the
output amplifier must always be nulled. Amplifier offset errors
create an overall degradation of DAC linearity.
The fundamental purpose of zeroing is to make the voltage
appearing at the DAC outputs as near 0V
(Continued)
*2.4 k
INSURE STABILITY
LF356
LF351
LF357
OP Amp
DC
RESISTOR ADDED FROM−INPUT TO GROUND TO
*
as possible.
22 pF
22 pF
10 pF
FIGURE 8.
C
C
14
(O to Full Scale)
This is accomplished for the typical DAC — op amp con-
nection ( Figure 7 ) by shorting out R
resistor, and adjusting the V
op amp until the output reads zero volts. This is done, of
course, with an applied digital code of all zeros if I
driving the op amp (all one’s for I
is then removed and the converter is zero adjusted.
4 µs
5 µs
2 µs
t
s
00560839
OS
nulling potentiometer of the
OUT2
fb
, the amplifier feedback
). The short around R
OUT1
is
fb