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AD7537KRZ Datasheet(PDF) 6 Page - Analog Devices

Part # AD7537KRZ
Description  LC2MOS 84) Loading Dual 12-Bit DAC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7537KRZ Datasheet(HTML) 6 Page - Analog Devices

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AD7537
REV.
–6–
SEPARATE AGND PINS
The DACs in the AD7537 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 program-
mable attenuator. AGNDA is at ground potential. DAC B is op-
erating with AGND B biased to +5 V by the AD584. This gives
an output range of +5 V to +10 V.
Figure 6. AD7537 DACs Used in Different Modes
PROGRAMMABLE OSCILLATOR
Figure 7 shows a conventional state variable oscillator in which
the AD7537 controls the programmable integrators. The fre-
quency of oscillation is given by:
f
=
1
2
π
R
6
R
5
×
1
C
1
×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 × REQ2
Since R
EQ
=
2n
× R
LAD
N
, (RLAD = DAC ladder resistance).
f
=
1
2
π
×
1
C
(N /2n )2
RLAD1 × RLAD2
=
1
2
π
×
D
C
1
RLAD1 × RLAD2
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.
Figure 7. Programmable State Variable Oscillator
A


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