AD5643R Analog Devices, AD5643R Datasheet - Page 24

• Manufacturer Part Number: AD5643R
• Manufacturer: Analog Devices

Specifications of AD5643R

• Resolution (bits): 14bit
• Dac Update Rate: 250kSPS
• Dac Settling Time: 3.5µs
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Voltage Out
• Dac Input Format: Ser,SPI

AD5623R/AD5643R/AD5663R
INTERNAL REFERENCE SETUP
The on-chip reference is off at power-up by default. This
reference can be turned on or off by setting a software
programmable bit, DB0, in the control register. Table 16 shows
how the state of the bit corresponds to the mode of operation.
Command 111 is reserved for setting up the internal reference
(see Table 8). See Table 16 for the contents of the input shift
register during the internal reference setup command.
Table 17. 32-Bit Input Shift Register Contents for Reference Setup Function
MSB
DB23 to DB22
x
Don’t care
DB21
1
Command bits (C2 to C0)
DB20
1
DB19
1
Rev. D | Page 24 of 32
DB18
x
Address bits (A2 to A0)
Table 16. Reference Setup Register
Internal Reference
Setup Register (DB0)
0
1
DB17
x
DB16
x
Action
Reference off (default)
Reference on
DB15 to DB1
x
Don’t care
DB0
1/0
Reference
setup register
LSB