Datasheet

DAC7678

www.ti.com

SBAS493B –FEBRUARY 2010–REVISED JULY 2012

Table 17. Control Matrix for Write Commands (continued)

COMMAND AND ACCESS BYTE MOST SIGNIFICANT DATA BYTE LEAST SIGNIFICANT DATA BYTE

DESCRIPTION

C3 C2 C1 C0 A3 A2 A1 A0 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0

Software Reset

Software reset (default). Equivalent to power-on

0 1 1 1 X X X X 0 0 X X X X X X X X X X X X X X

reset (POR).

Software reset that sets device into High-Speed

0 1 1 1 X X X X 0 1 X X X X X X X X X X X X X X

mode

Software reset that maintains High-Speed mode

0 1 1 1 X X X X 1 0 X X X X X X X X X X X X X X

state

Internal Reference in Regular/Static Mode

1 0 0 0 X X X X X X X X X X X X X X X AR X X X X

1 0 0 0 X X X X X X X X X X X X X X X 0 X X X X Disable internal reference (Regular/Static mode)

X Enable internal reference (Regular/Static mode). If

1 0 0 0 X X X X X X X X X X X X X X X 1 X X X any DACs are powered on, the reference is on. If

all DACS are powered down, then reference is off.

Internal Reference in Flexible Mode

1 0 0 1 X X X X X TR2 TR1 TR0 X X X X X X X X X X X X

Reference powers down when all DACs power

1 0 0 1 X X X X X 1 0 0 X X X X X X X X X X X X down. Reference powers on when any DACs are

powered on.

Reference is powered on regardless of DAC power

1 0 0 1 X X X X X 1 0 1 X X X X X X X X X X X X

state

Reference is powered down regardless of DAC

1 0 0 1 X X X X X 1 1 0 X X X X X X X X X X X X

power state

Reference follows Regular/Static mode reference

1 0 0 1 X X X X X 0 X X X X X X X X X X X X X X

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