AD5721R 데이터 시트보기 (PDF) - Analog Devices
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AD5721R Datasheet PDF : 36 Pages
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Data Sheet
AD5761R/AD5721R
UPDATE DAC REGISTER FROM INPUT REGISTER
The update DAC register function loads the DAC register with the data saved in the input register and updates the DAC output voltage.
This operation is equivalent to a software LDAC. Table 17 outlines how data is written to the DAC register.
Table 17. Update DAC Register from Input Register
MSB
DB23
DB22
DB21
DB20
DB19
X1
X1
X1
0
DB18
DB17
Register address
0010
DB16
LSB
DB[15:0]
Register data
Don’t care
1 X is don’t care.
READBACK DAC REGISTER
The readback DAC register operation provides the contents of the DAC register by setting the register address to 1011. Table 18 outlines
the 24-bit shift register for this command. During the next command, the DAC register contents are shifted out of the SDO pin with the
MSB shifted out first. Table 19 outlines the 24-bit data read from the SDO pin, where DB23 is the first bit shifted out.
Table 18. Readback DAC Register, 24-Bit Shift Register to SDI Pin
MSB
DB23
DB22
DB21
DB20
DB19
DB18
DB17
Register address
X1
X1
X1
0
1011
DB16
LSB
DB[15:0]
Register data
Don’t care
1 X is don’t care.
Table 19. Readback DAC Register, 24-Bit Data Read from SDO Pin
MSB
LSB
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB[15:0]
Register address
Register data
X1
X1
X1
0
1011
Data read from DAC register
1 X is don’t care.
WRITE AND UPDATE DAC REGISTER
The write and update DAC register (Register Address 0011) updates the input register and the DAC register with the entered data-word
from the input shift register, irrespective of the state of LDAC.
Setting the register address to 0001 writes the input register with the data from the input shift register, clocked in MSB first on the SDI pin.
Table 20. Write and Update DAC Register
MSB
DB23
DB22
DB21
DB20
X1
X1
X1
0
X1
X1
X1
0
DB19
DB18
DB17
Register address
0001
0011
DB16
LSB
DB[15:0]
Register data
Data loaded
Data loaded
1 X is don’t care.
Rev. C | Page 31 of 36
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