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參數(shù)資料
| 型號： | AD7937 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | LC2MOS 8+4 Loading Dual 12-Bit DAC |
| 中文描述： | LC2MOS 8 4載入中雙12位DAC |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 157K |
| 代理商： | AD7937 |
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.
I
OUTA
AGNDA
R
FBA
A1
V
REFA
I
OUTB
AGNDB
R
FBB
V
DD
DGND
DATA
INPUT
AD7937
*
DB7
DB0
V
REFB
*
CONTROL CIRCUITRY OMITTED FOR CLARITY
DAC A
20V p
–
p
A2
DAC B
AD584
5V
SIGNAL
V
= 5V
TO 10V
V
OUTA
V
DD
= 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
R
6
R
5
×
1
C
1
×
C
2
×
R
EQ
1
×
R
EQ
2
where R
EQ1
and R
EQ2
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
R
EQ
1
×
R
EQ
2
Since
R
EQ
=
2
n
×
R
LAD
N
, (R
LAD
= DAC ladder resistance).
f
=
1
2
π×
1
C
(
N
/2
n
)
2
R
LAD
1
×
R
LAD
2
=
1
2
π×
D
C
1
R
LAD
1
×
R
LAD
2
D
=
N
2
n
=
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.
I
OUTA
AGNDA
1/2 AD7937
V
REFA
R6
10k
V
OUT
2R4
A1
1/2
AD712
10k
A2
DAC A
C1
10,000pF
I
OUTB
AGNDB
1/2 AD7937
V
REFB
1/2
AD712
A3
DAC B
C2
10,000pF
R5
10k
AD711
FREQUENCY
SELECT CODE
5.1V
NOTE
DAC CONTROL INPUTS OMITTED FOR CLARITY
Figure 7. Programmable State Variable Oscillator
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7937AR | LC2MOS 8+4 Loading Dual 12-Bit DAC |
| AD7937BR | LC2MOS 8+4 Loading Dual 12-Bit DAC |
| AD7938 | 8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer |
| AD7938BCP | 8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer |
| AD7938BSU | 8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer |
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| AD7937AR-REEL7 | 制造商:Analog Devices 功能描述:DAC 2CH R-2R 12-BIT 24SOIC W - Tape and Reel |
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