AD5781 Analog Devices, AD5781 Datasheet - Page 24

• Manufacturer Part Number: AD5781
• Manufacturer: Analog Devices

Specifications of AD5781

• Resolution (bits): 18bit
• Dac Update Rate: 1MSPS
• Dac Settling Time: 1µs
• Max Pos Supply (v): +33V
• Single-supply: No
• Dac Type: Unbuffered Vout
• Dac Input Format: Ser,SPI

AD5781
Software Control Register
This is a write only register in which writing a 1 to a particular bit has the same effect as pulsing the corresponding pin low.
Table 14. Software Control Register
MSB
DB23
R/ W
0
1
2
Table 15. Software Control Register Functions
Function
LDAC
CLR
RESET
The CLR function has no effect if the LDAC pin is low.
The LDAC function has no effect if the CLR pin is low.
Setting this bit to 1 returns the
Description
Setting this bit to 1 updates the DAC register and consequently the DAC output.
Setting this bit to 1 sets the DAC register to a user defined value (see Table 13) and updates the DAC output. The output
value depends on the DAC register coding that is being used, either binary or twos complement.
DB22
1
Register address
DB21
0
AD5781
DB20
0
to its power-on state.
Rev. C | Page 24 of 28
DB19
Reserved
DB3
Software control register data
DB2
RESET
DB1
CLR
1
Data Sheet
DB0
LDAC
2
LSB