AD5512AACPZ AD [Analog Devices], AD5512AACPZ Datasheet - Page 17

• Manufacturer Part Number: AD5512AACPZ
• Description: 2.7 V to 5.5 V, Serial-Input, Voltage-Output, 16-/12-Bit nanoDACs in LFCSP
• Manufacturer: AD [Analog Devices]

Preliminary Technical Data
APPLICATIONS INFORMATION
OPTOCOUPLER INTERFACE
The digital inputs of the AD5541A/AD5542A/AD5512A are
Schmitt-triggered so that they can accept slow transitions on the
digital input lines. This makes these parts ideal for industrial
applications where it may be necessary to isolate the DAC from
the controller via optocouplers. Figure 37 illustrates such an
interface.
POWER
SCLK
DIN
CS
Figure 37. AD5541/AD5542 in an Optocoupler Interface
10kΩ
10kΩ
10kΩ
V
V
V
DD
DD
DD
REGULATOR
SCLK
CS
DIN
5V
AD5541/AD5542
GND
V
DD
V
OUT
10µF
0.1µF
Rev. PrA | Page 17 of 24
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 receives the CS signal at any one
time. The DAC addressed is determined by the decoder. There is
some digital feedthrough from the digital input lines. Using a
burst clock minimizes the effects of digital feedthrough on the
analog signal channels. Figure 38 shows a typical circuit.
ADDRESS
ENABLE
CODED
SCLK
DIN
Figure 38. Addressing Multiple AD5541/AD5542s
EN
DECODER
AD5541A/AD5542A/AD5512AA
DGND
V
DD
AD5541/AD5542
AD5541/AD5542
AD5541/AD5542
AD5541/AD5542
CS
DIN
SCLK
CS
DIN
SCLK
CS
DIN
SCLK
CS
DIN
SCLK
V
V
V
V
OUT
OUT
OUT
OUT