参数资料
型号: AD7520UD
厂商: HARRIS SEMICONDUCTOR
元件分类: DAC
英文描述: 10-Bit, 12-Bit, Multiplying D/A Converters
中文描述: PARALLEL, WORD INPUT LOADING, 1 us SETTLING TIME, 10-BIT DAC, CDIP16
文件页数: 7/14页
文件大小: 264K
代理商: AD7520UD
Typical Applications
(Continued)
V
OUT
e
b
V
REF
a
A3
8
#
A1
2
a
A2
4
a
. . .1024
J
where: V
REF
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 V
REF
by zero!
FIGURE 10. Analog-to-Digital Divider (or Digitally Gain Controlled Amplifier)
V
OUT
e
V
REF
%
A1
2
a
A2
4
a
. . .
a
A10
1024
A1
2
a
A2
4
a
. . .
a
A10
1024
or V
OUT
e
V
REF
#
1023
b
N
N
J
where: 0
s
N
s
1023
N
e
0 for A
N
e
all zeros
N
e
1 for A10
e
1, A1–A9
e
0
.
.
.
N
e
1023 for A
N
e
all 1’s
FIGURE 11. Digitally controlled Amplifier-Attenuator
TL/H/5689–7
http://www.national.com
7
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