Theory of operation

STHVDAC-253M

14/27

DocID025735 Rev 1

Without triggers:

When the TRIG_MASK are set to 1 (disable) the outputs will change after the DAC are set.

When using the extended write all output will changed at the same time.

The Figure 7 below represents operation without trigger and using extended write.

Figure 7. Operating without triggers

REG_28 write(0x001C)

Extended register write

(2 or 3 tunable capacitor)

Initial value

Initial value

Initial value

10

µs

Value change

Value change

Value change

10

µs

Initial value

Value change

PWR_

MODE

PWR_

MODE

Low power

Low power

Active

100

µs

100

µs

REG_0 write

(one tunablecapacitor)

Tunable capacitor #1

(associated to OUTC)

(associated to OUTB)

(associated to OUTA)

Tunable capacitor #2

Tunable capacitor #3

DAC

OUTC

DAC

OUTC

DAC

OUTC

DAC

OUTC

DAC

OUTB

DAC

OUTB

DAC

OUTA

DAC

OUTA