Datasheet

DAC7565
SBAS412B –FEBRUARY 2008–REVISED MARCH 2011 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 of 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
0 0 LD 1 LD 0 0 DAC Sel 1 DAC Sel 0 PD0 MSB MSB-1 MSB-2...LSB Don't Care DESCRIPTION
0 0 0 0 0 0 Data X Write to buffer A with data
0 0 0 0 1 0 Data X Write to buffer B with data
0 0 0 1 0 0 Data X Write to buffer C with data
0 0 0 1 1 0 Data X Write to buffer D with data
Write to buffer (selected by DB17 and DB18) with
0 0 0 (00, 01, 10, or 11) 1 See Table 7 0 X
power-down command
Write to buffer with data and load DAC (selected
0 1 0 (00, 01, 10, or 11) 0 Data X
by DB17 and DB18)
Write to buffer with power-down command and
0 1 0 (00, 01, 10, or 11) 1 See Table 7 0 X
load DAC (selected by DB17 and DB18)
Write to buffer with data (selected by DB17 and
1 0 0 (00, 01, 10, or 11) 0 Data X 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
1 0 0 (00, 01, 10, or 11) 1 See Table 7 0 X
DACs simultaneously from their corresponding
buffers
Broadcast Modes
0 Simultaneously update all channels of DAC7565
X X 1 1 0 X X X X with data stored in each channels temporary
register
Write to all channels and load all DACs with SR
X X 1 1 0 1 X 0 Data X
data
Write to all channels and load all DACs with
X X 1 1 0 1 X 1 See Table 7 0 X
power-down command in SR
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