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DAC0832LCJ データシート(PDF) 16 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 DAC0832LCJ
部品情報  8-Bit P Compatible, Double-Buffered D to A Converters
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

DAC0832LCJ データシート(HTML) 16 Page - National Semiconductor (TI)

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DAC0830 Series Application Hints (Continued)
This configuration offers several useful application advan-
tages. Since the output is a voltage, an external op amp is
not necessarily required but the output impedance of the
DAC is fairly high (equal to the specified reference input
resistance of 10 k
Ω to 20 kΩ) so an op amp may be used for
buffering purposes. Some of the advantages of this mode
are illustrated in
Figures 12, 13, 14, 15.
There are two important things to keep in mind when using
this DAC in the voltage switching mode. The applied refer-
ence voltage must be positive since there are internal para-
sitic diodes from ground to the I
OUT1 and IOUT2 terminals
which would turn on if the applied reference went negative.
There is also a dependence of conversion linearity and gain
error on the voltage difference between V
CC and the voltage
applied to the normal current output terminals. This is a
result of the voltage drive requirements of the ladder
switches. To ensure that all 8 switches turn on sufficiently (so
as not to add significant resistance to any leg of the ladder
and thereby introduce additional linearity and gain errors) it
is recommended that the applied reference voltage be kept
less than +5V
DC and VCC be at least 9V more positive than
V
REF. These restrictions ensure less than 0.1% linearity and
gain error change.
Figures 16, 17, 18 characterize the ef-
fects of bringing V
REF and VCC closer together as well as
typical temperature performance of this voltage switching
configuration.
00560811
FIGURE 10. Adding Full-Scale Adjustment
00560812
FIGURE 11. Voltage Mode Switching
00560841
Voltage switching mode eliminates output signal inver-
sion and therefore a need for a negative power supply.
Zero code output voltage is limited by the low level output
saturation voltage of the op amp. The 2 k
Ω pull-down
resistor helps to reduce this voltage.
V
OS of the op amp has no effect on DAC linearity.
FIGURE 12. Single Supply DAC
www.national.com
16


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