DAC8563 datasheet(32/63 Pages) TI2

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OUT

Amplifier

Power-Down

Circuitry

Resistor

Network

Resistor

String

DAC

DAC7562, DAC7563, DAC8162

DAC8163, DAC8562, DAC8563

SLAS719E – AUGUST 2010 – REVISED JUNE 2015

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8.4 Device Functional Modes

8.4.1 Power-Down Modes

The DAC756x, DAC816x, and DAC856x devices have two separate sets of power-down commands. One set is

for the DAC channels and the other set is for the internal reference. The internal reference is forced to a

powered-down state while both DAC channels are powered down, and is only enabled if any DAC channel is

also in the normal mode of operation. For more information on the internal reference control, see the Internal

Reference Enable Register section.

8.4.1.1 DAC Power-Down Commands

The DAC756x, DAC816x, and DAC856x DACs use four modes of operation. These modes are accessed by

setting the serial interface command bits to 100. Once the command bits are set correctly, the four different

power-down modes are software programmable by setting bits DB5 and DB4 in the shift register. Table 5 and

Table 6 show the different power-down options. For more information on how to set the DAC operating mode see

Table 17.

Table 5. DAC-n Operating Modes

DB5

DB4

DAC Modes of Operation

Selected DACs power up (normal mode, default)

Selected DACs power down, output 1 k

Ω to GND

Selected DACs power down, output 100 k

Ω to GND

Selected DACs power down, output Hi-Z to GND

Table 6. DAC-n Selection for Operating Modes

DAC-B (DB1), DAC-A (DB0)

Operating Mode

DAC-n does not change operating mode

DAC-n operating mode set to value on PD1 and PD0

It is possible to write to the DAC register or buffer of the DAC channel that is powered down. When the DAC

channel is then powered up, it powers up to this new value.

The advantage of the available power-down modes is that the output impedance of the device is known while it is

in power-down mode. As described in Table 5, there are three different power-down options. VOUT can be

connected internally to GND through a 1-k

Ω resistor, a 100-kΩ resistor, or open-circuited (Hi-Z). The DAC

power-down circuitry is shown in Figure 92.

Figure 92. Output Stage

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