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AD5683RARMZ Datasheet(PDF) 22 Page - Analog Devices

Part # AD5683RARMZ
Description  Tiny 16-/14-/12-Bit SPI nanoDAC
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5683RARMZ Datasheet(HTML) 22 Page - Analog Devices

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AD5683R/AD5682R/AD5681R/AD5683
Data Sheet
Rev. D | Page 22 of 28
Daisy-Chain Connection
Daisy chaining minimizes the number of pins required from the
controlling IC. As shown in Figure 50, the SDO pin of one package
must be tied to the SDI pin of the next package. The clock period
may need to be increased, as shown in Table 4, because of the
propagation delay of the line between subsequent devices.
By default, the SDO pin is disabled. To enable daisy-chain
operation, the DCEN bit must be set in the write control
register (see Table 10).
When the daisy-chain mode is enabled (DCEN = 1), the
AD5683R/AD5682R/AD5681R/AD5683 accept as a valid
frame any data-word larger than 24 bits, decoding the last
24 bits received, as shown in Figure 51.
MISO
SDI
SCLK
MOSI
SCLK
SDO
SDO
SCLK
SDI
SYNC
SYNC
AD5683R
AD5683R
CONTROLLER
SS
U1
U2
Figure 50. Daisy-Chain Connection
SDO_U1
MOSI
SYNC
SCLK
48
24
DB23
DB0
DB23
DB0
DB23
INPUT WORD FOR DAC 2
UNDEFINED
INPUT WORD FOR DAC 2
DB0
INPUT WORD FOR DAC 1
Figure 51. Daisy-Chain Timing Diagram



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