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AD7530KN Datasheet(数据表) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件型号  AD7530KN
说明  10-Bit, 12-Bit Binary Multiplying D/A Converter
下载  14 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 

 7 page
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Typical Applications (Continued)
VOUT e
b
VREF
A12aA24aA38a A10
1024
J
where VREF can be an AC signal
 By connecting the DAC in the feedback loop of an opera-
tional amplifier a linear digitally control gain block can be
realized
 Note that with all digital inputs low the gain of the amplifier
is infinity that is the op amp will saturate In other words we
cannot divide the VREF by zero
FIGURE 10 Analog-to-Digital Divider (or Digitally Gain Controlled Amplifier)
VOUT e VREF
%
A1
2
a
A2
4
a
a
A10
1024
A1
2
a
A2
4
a
a
A10
1024
or VOUT e VREF
1023bN
N
J
where 0 s N s 1023
N e 0 for AN e all zeros
N e 1 for A10 e 1 A1–A9 e 0
N e 1023 for AN e all 1’s
FIGURE 11 Digitally controlled Amplifier-Attenuator
TLH5689 – 7
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www nationalcom
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