AD5541BR(1999) データシートの表示（PDF） - Analog Devices
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AD5541BR Datasheet PDF : 12 Pages
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AD5541/AD5542
APPLICATIONS
Optocoupler interface
The digital inputs of the AD5541/AD5542 are Schmitt-
triggered, so they can accept slow transitions on the digital input
lines. This makes these parts ideal for industrial applications
where it may be necessary that the DAC is isolated from the
controller via optocouplers. Figure 25 illustrates such an interface.
POWER
SCLK
CS
DIN
5V
REGULATOR
10F
0.1F
VDD
10k⍀
VDD
SCLK
VDD
10k⍀
VDD
AD5541/AD5542
CS
VOUT
10k⍀
DIN
GND
Figure 25. AD5541/AD5542 in an Optocoupler Interface
Decoding Multiple AD5541/AD5542s
The CS pin of the AD5541/AD5542 can be used to select one
of a number of DACs. All devices receive the same serial clock
and serial data, but only one device will receive the CS signal at
any one time. The DAC addressed will be determined by the
decoder. There will be some digital feedthrough from the digital
input lines. Using a burst clock will minimize the effects of digi-
tal feedthrough on the analog signal channels. Figure 26 shows a
typical circuit.
SCLK
DIN
VDD
AD5541/AD5542
CS
VOUT
DIN
SCLK
ENABLE
CODED
ADDRESS
EN
DECODER
DGND
AD5541/AD5542
CS
VOUT
DIN
SCLK
AD5541/AD5542
CS
VOUT
DIN
SCLK
AD5541/AD5542
CS
DIN
SCLK
VOUT
Figure 26. Addressing Multiple AD5541/AD5542s
8-Lead SO
(SO-8)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
14-Lead SO
(R-14)
0.1968 (5.00)
0.1890 (4.80)
8
0.1574 (4.00)
0.1497 (3.80) 1
5
0.2440 (6.20)
4 0.2284 (5.80)
PIN 1
0.0500 (1.27)
BSC
0.0196 (0.50)
0.0099 (0.25) ؋ 45؇
0.0098 (0.25)
0.0040 (0.10)
SEATING
PLANE
0.0688 (1.75)
0.0532 (1.35)
8؇
0.0192 (0.49)
0.0098 (0.25) 0؇
0.0138 (0.35)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
0.3444 (8.75)
0.3367 (8.55)
0.1574 (4.00) 14
0.1497 (3.80)
1
8 0.2440 (6.20)
0.2284 (5.80)
7
PIN 1 0.050 (1.27) 0.0688 (1.75)
BSC
0.0532 (1.35)
0.0196 (0.50)
0.0099 (0.25)؋ 45؇
0.0098 (0.25)
0.0040 (0.10)
8؇
0.0192 (0.49)
0.0138 (0.35)
SEATING
PLANE
0.0099 (0.25) 0؇
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
–12–
REV. A
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