DAC8564 datasheet(28/46 Pages) TI

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DAC7565

SBAS412A – FEBRUARY 2008 – REVISED MARCH 2008 ............................................................................................................................................... www.ti.com

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

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

each analog output with the specified 12-bit data

The data buffer and DAC register corresponding to a

value or power-down command. Bit DB19 must

DAC selected by DB18 and DB17 update with the

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

contents of SR data (or power-down).

DB17)

control

the

destination

the

data

(or

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

power-down command) from DAC A through DAC D.

channel selected by DB18 and DB17 updates with

The final control bit, PD0 (DB16), selects the

the SR data; simultaneously, all the other channels

power-down mode of the DAC7565 channels as well

update with previously stored data (or power-down)

as the power-down mode of the internal reference.

from data buffers.

The DAC7565 supports a number of different load

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

commands. The load commands include broadcast

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

commands to address all the DAC7565s on an SPI

are

updated

with

previously

stored

data

(or

bus. The load commands are summarized as follows:

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

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

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

for more information.

data buffer corresponding to a DAC selected by

DB18 and DB17 updates with the contents of SR

data (or power-down).

Table 6. Control Matrix for the DAC7565

DB23

DB22

DB21

DB20

DB19

DB18

DB17

DB16

DB15

DB14

DB13-DB4

DB3-DB0

LD 1

LD 0

DAC Sel 1

DAC Sel 0

PD0

MSB

MSB-1

MSB-2...LSB

Don't Care

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

(00, 01, 10, or 11)

Data

by DB17 and DB18)

Write to buffer with power-down command and

(00, 01, 10, or 11)

See Table 7

load DAC (selected by DB17 and DB18)

Write to buffer with data (selected by DB17 and

(00, 01, 10, or 11)

Data

DB18) and then load all DACs simultaneously

from their corresponding buffers

Write to buffer with power-down command

(selected by DB17 and DB18) and then load all

(00, 01, 10, or 11)

See Table 7

DACs simultaneously from their corresponding

buffers

Broadcast Modes

Simultaneously update all channels of DAC7565

with data stored in each channels temporary

Write to all channels and load all DACs with SR

Data

data

Write to all channels and load all DACs with

See Table 7

power-down command in SR

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