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MC1408P8 データシート(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 MC1408P8
部品情報  8-Bit D/A Converter
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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)

MC1408P8 データシート(HTML) 9 Page - National Semiconductor (TI)

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Test Circuits (Continued)
Application Hints
REFERENCE AMPLIFIER DRIVE AND COMPENSATION
The reference amplifier provides a voltage at pin 14 for
converting the reference voltage to a current, and a
turn-around circuit or current mirror for feeding the ladder.
The reference amplifier input currrent, I
14, must always flow
into pin 14, regardless of the set-up method or reference
voltage polarity.
Connections for a positive voltage are shown in
Figure 7.
The reference voltage source supplies the full current I
14.
For bipolar reference signals, as in the multiplying mode,
R15 can be tied to a negative voltage corresponding to the
minimum input level. It is possible to eliminate R15 with only
a small sacrifice in accuracy and temperature drift.
The compensation capacitor value must be increased with
increases in R14 to maintain proper phase margin; for R14
values of 1, 2.5 and 5 k
Ω, minimum capacitor values are 15,
37 and 75 pF. The capacitor may be tied to either V
EE or
ground, but using V
EE increases negative supply rejection.
A negative reference voltage may be used if R14 is
grounded and the reference voltage is applied to R15 as
shown in
Figure 8. A high input impedance is the main
DS005687-11
FIGURE 8. Negative V
REF (Note 8)
DS005687-12
FIGURE 9. Programmable Gain Amplifier or
Digital Attenuator Circuit (Note 8)
www.national.com
9


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