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AD7937AR データシート(PDF) 6 Page - Analog Devices

部品番号 AD7937AR
部品情報  LC2MOS 84 Loading Dual 12-Bit DAC
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD7937AR データシート(HTML) 6 Page - Analog Devices

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AD7937
–6–
REV. 0
SEPARATE AGND PINS
The DACs in the AD7937 have separate AGND lines taken to
pins AGNDA and AGNDB on the package. This increases the
applications versatility of the part. Figure 6 is an example of this.
DAC A is connected in standard fashion as a programmable
attenuator. AGNDA is at ground potential. DAC B is operating
with AGND B biased to 5 V by the AD584. This gives an out-
put range of 5 V to 10 V.
IOUTA
AGNDA
RFBA
A1
VREFA
IOUTB
AGNDB
RFBB
VDD
DGND
DATA
INPUT
AD7937*
DB7
DB0
*CONTROL CIRCUITRY OMITTED FOR CLARITY
DAC A
20V p–p
A2
DAC B
VREFB
AD584
5V
SIGNAL
GROUND
VOUTB = 5V
TO 10V
VOUTA
VDD = 5V
Figure 6. DACs Used in Different Modes
PROGRAMMABLE OSCILLATOR
Figure 7 shows a conventional state variable oscillator in which
the AD7937 controls the programmable integrators. The frequency
of oscillation is given by:
f
=
1
2
π
R6
R5
×
1
C1
×C2× REQ1× REQ2
where REQ1 and REQ2 are the equivalent resistances of the DACs.
The same digital code is loaded into both DACs. If C1 = C2
and R5 = R6, the expression reduces to
f
=
1
2
π
×
1
C
1
REQ1
× R
EQ2
Since REQ
=
2n
× R
LAD
N
, (RLAD = DAC ladder resistance).
f
=
1
2
π
×
1
C
(N /2n )2
RLAD1
× R
LAD2
=
1
2
π
×
D
C
1
RLAD1
× R
LAD2
D
=
N
2n


=
1
2
π
×
D
C
× R
LAD m
where m is the DAC ladder resistance mismatch ratio, typically
1.005.
With the values shown in Figure 7, the output frequency varies
from 0 Hz to 1.38 kHz. The amplitude of the output signal at
the A3 output is 10 V peak-to-peak and is constant over the
entire frequency span.
IOUTA
AGNDA
1/2 AD7937
R6
10k
VOUT
R4
200k
A1
1/2
AD712
10k
A2
DAC A
VREFA
C1
10,000pF
IOUTB
AGNDB
1/2 AD7937
1/2
AD712
A3
DAC B
VREFB
C2
10,000pF
R5
10k
AD711
FREQUENCY
SELECT CODE
5.1V
NOTE
DAC CONTROL INPUTS OMITTED FOR CLARITY
Figure 7. Programmable State Variable Oscillator


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