DAC8564 datasheet(28/51 Pages) TI2

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DAC8565

SBAS411C

– JUNE 2007 – REVISED MARCH 2011

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LD1 (DB21) and LD0 (DB20) control the updating of

DB21 = 0 and DB20 = 1: Single-channel update.

each analog output with the specified 16-bit data

The

temporary

and

DAC

value or power-down command. Bit DB19 must

corresponding to a DAC selected by DB18 and DB17

always be '0'. The DAC channel select bits (DB18,

are updated with the contents of SR data (or

DB17)

control

the

destination

the

data

(or

power-down).

power-down command) from DAC A to DAC D. The

DB21 = 1 and DB20 = 0: Simultaneous update. A

final control bit, PD0 (DB16), selects the power-down

channel selected by DB18 and DB17 updates with

mode of the DAC8565 channels as well as the

the SR data; simultaneously, all the other channels

power-down mode of the internal reference.

update with previously stored data (or power-down)

The DAC8565 supports a number of different load

from temporary registers.

commands. The load commands include broadcast

DB21 = 1 and DB20 = 1: Broadcast update. If

commands to address all the DAC8565s on an SPI

DB18 = 0, then SR data are ignored and all channels

bus. The load commands are summarized as follows:

are

updated

with

previously

stored

data

(or

DB21 = 0 and DB20 = 0: Single-channel store. The

power-down). If DB18 = 1, then SR data (or

temporary register (data buffer) corresponding to a

power-down) updates all channels. Refer to Table 6

DAC selected by DB18 and DB17 updates with the

for more information.

contents of SR data (or power-down).

Table 6. Control Matrix for the DAC8565

DB23

DB22

DB21

DB20

DB19

DB18

DB17

DB16

DB15

DB14

DB13-DB0

LD 1

LD 0

DAC Sel 1

DAC Sel 0

PD0

MSB

MSB-1

MSB-2...LSB

DESCRIPTION

Data

Write to buffer A with data

Data

Write to buffer B with data

Data

Write to buffer C with data

Data

Write to buffer D with data

Write to buffer (selected by DB17 and DB18) with

(00, 01, 10, or 11)

See Table 7

power-down command

Write to buffer with data and load DAC (selected by

(00, 01, 10, or 11)

Data

DB17 and DB18)

Write to buffer with power-down command and load

(00, 01, 10, or 11)

See Table 7

DAC (selected by DB17 and DB18)

Write to buffer with data (selected by DB17 and DB18)

(00, 01, 10, or 11)

Data

and then load all DACs simultaneously from their

corresponding buffers

Write to buffer with power-down command (selected by

(00, 01, 10, or 11)

See Table 7

DB17 and DB18) and then load all DACs

simultaneously from their corresponding buffers

Broadcast Modes

Simultaneously update all channels of DAC8565 with

data stored in each channels temporary register

Data

Write to all channels and load all DACs with SR data

Write to all channels and load all DACs with

See Table 7

power-down command in SR

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