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AD8021 Datasheet(PDF) 6 Page - Analog Devices

Part # AD8021
Description  Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface
PDF  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8021 Datasheet(HTML) 6 Page - Analog Devices

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AD5429/AD5439/AD5449
Rev. 0 | Page 6 of 32
t1
t2
t3
t7
t8
t4
t5
t6
t9
t10
t11
DB15
DB0
SCLK
DIN
LDAC1
LDAC2
SYNC
NOTES
1ASYNCHRONOUS LDAC UPDATE MODE
2SYNCHRONOUS LDAC UPDATE MODE
ALTERNATIVELY, DATA CAN BE CLOCKED INTO INPUT SHIFT REGISTER ON RISING EDGE OF SCLK AS
DETERMINED BY CONTROL BITS. TIMING AS ABOVE, WITH SCLK INVERTED.
Figure 2. Standalone Mode Timing Diagram
t8
t7
t12
t1
t3
t2
t4
t5
t6
DB15
(N)
DB15
(N+1)
DB0
(N)
DB0
(N+1)
DB15
(N)
DB0
(N)
SCLK
SYNC
SDIN
SDO
ALTERNATIVELY, DATA CAN BE CLOCKED INTO INPUT SHIFT REGISTER ON RISING EDGE OF SCLK AS
DETERMINED BY CONTROL BITS. IN THIS CASE, DATA WOULD BE CLOCKED OUT OF SDO ON FALLING
EDGE OF SCLK. TIMING AS ABOVE, WITH SCLK INVERTED.
Figure 3. Daisy-Chain and Readback Modes Timing Diagram
200
µAI
OL
200
µAI
OH
TO OUTPUT
PIN
CL
50pF
VOH (MIN) + VOL (MAX)
2
Figure 4. Load Circuit for SDO Timing Specifications



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