DAC7568 datasheet(32/58 Pages) TI

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DAC7568

DAC8168

DAC8568

SBAS430A – JANUARY 2009 – REVISED APRIL 2009 ..................................................................................................................................................... www.ti.com

Flexible Mode (see Table 3, Table 4, and Table 5)

performing a power cycle to reset the device, the

internal reference is switched off (default mode). In

Enabling Internal Reference:

the default mode, the internal reference is powered

Method 1) To enable the internal reference, write the

down until a valid write sequence is applied to power

32-bit serial command shown in Table 3. When

up the internal reference. When the internal reference

performing a power cycle to reset the device, the

is powered up, it remains powered up, regardless of

internal reference is switched off (default mode). In

the state of the DACs.

the default mode, the internal reference is powered

Disabling Internal Reference:

down until a valid write sequence is applied to power

up the internal reference. If the internal reference is

To disable the internal reference, write the 32-bit

powered up, it automatically powers down when all

serial command shown in Table 5. When performing

DACs power down in any of the power-down modes

a power cycle to reset the device, the internal

(see the Power Down Modes section). The internal

reference is switched off (default mode).

reference powers up automatically when any DAC is

When the internal reference is operated in Flexible

powered up.

mode, Static mode is disabled and does not work. To

Method 2) To always enable the internal reference,

switch from Flexible mode to Static mode, use the

write the 32-bit serial command shown in Table 4.

command shown in Table 6.

When the internal reference is always enabled, any

power-down command to the DAC channels does not

change the internal reference operating mode. When

Table 3. Write Sequence for Enabling Internal Reference (Flexible Mode)

(Internal Reference Powered On—09080000h)

DB31

DB27

DB23

DB19

DB4

DB0

|-- Prefix Bits --| |- Control Bits -|

| Address Bits |

|-------------------------------------- Data Bits --------------------------------------|

| Feature Bits |

Table 4. Write Sequence for Enabling Internal Reference (Flexible Mode)

(Internal Reference Always Powered On—090A0000h)

DB31

DB27

DB23

DB19

DB4

DB0

|-- Prefix Bits --| |- Control Bits -|

| Address Bits |

|-------------------------------------- Data Bits --------------------------------------|

| Feature Bits |

Table 5. Write Sequence for Disabling Internal Reference (Flexible Mode)

(Internal Reference Always Powered Down—090C0000h)

DB31

DB27

DB23

DB19

DB4

DB0

|-- Prefix Bits --| |- Control Bits -|

| Address Bits |

|-------------------------------------- Data Bits --------------------------------------|

| Feature Bits |

Table 6. Write Sequence for Switching from Flexible Mode to Static Mode for Internal Reference

(Internal Reference Always Powered Down—09000000h)

DB31

DB27

DB23

DB19

DB4

DB0

|-- Prefix Bits --| |- Control Bits -|

| Address Bits |

|-------------------------------------- Data Bits --------------------------------------|

| Feature Bits |

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