Datasheet
DAC7568
DAC8168
DAC8568
www.ti.com
SBAS430D –JANUARY 2009–REVISED MAY 2012
Example 4: Power-Down All Channels Simultaneously while Reference is Always Powered Up
1st: Write sequence for enabling the DAC7568, DAC8168, and DAC8568 internal reference all the time:
DB30- DB16-
DB31
DB28
DB27
DB26
DB25
DB24
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Don't D13-
0 Care C3 C2 C1 C0 A3 A2 A1 A0 D16 D15 D14 D4 D3 D2 D1 F3 F2 F1 F0
0 X 1 0 0 1 X X X X 1 0 1 X X X X X X X X
2nd: Write sequence to power-down all DACs to high-impedance:
DB30- DB19-
DB31
DB28
DB27
DB26
DB25
DB24
DB23
DB22
DB21
DB20
DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Don't D16-
0 Care C3 C2 C1 C0 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 F3 F2 F1 F0
0 X 0 1 0 0 X X X X X 1 1 1 1 1 1 1 1 1 1
The DAC A, DAC B, DAC C, DAC D, DAC E, DAC F, DAC G, and DAC H analog outputs simultaneously power-
down to high-impedance upon completion of the first and second write sequences, respectively.
Example 5: Write a Specific Value to All DACs while Reference is Always Powered Down
1st: Write sequence for disabling the DAC7568, DAC8168, and DAC8568 internal reference all the time
(after this sequence, these devices require an external reference source to function):
DB30- DB16-
DB31
DB28
DB27
DB26
DB25
DB24
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Don't D13-
0 Care C3 C2 C1 C0 A3 A2 A1 A0 D16 D15 D14 D4 D3 D2 D1 F3 F2 F1 F0
0 X 1 0 0 1 X X X X 1 1 0 X X X X X X X X
2nd: Write sequence to write specified data to all DACs:
DB30- DB19-
DB31
DB28
DB27
DB26
DB25
DB24
DB23
DB22
DB21
DB20
DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Don't D16-
0 Care C3 C2 C1 C0 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 F3 F2 F1 F0
0 X 0 0 1 1 1 1 1 1 DATA X X X X
The DAC A, DAC B, DAC C, DAC D, DAC E, DAC F, DAC G, and DAC H analog outputs simultaneously settle
to the specified values upon completion of the second write sequence. (The DAC voltages update simultaneously
after the 32nd SCLK falling edge of the second write cycle). Reference is always powered-down (External
reference must be used for proper operation).
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Product Folder Link(s): DAC7568 DAC8168 DAC8568