Datasheet

MAX5590–MAX5595
Buffered, Fast-Settling, Octal, 12/10/8-Bit,
Voltage-Output DACs
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Table 9. Shutdown-Mode Write Command (DACA–DACD)
Table 10. Shutdown-Mode Write Command (DACE–DACH)
Table 11. Shutdown-Control-Bits Write Command
DATA CONTROL BITS DATA BITS
DIN10110000P D D 1P D D 0P D C 1P D C 0P D B1 P D B0 P D A1 P D A0
DATA CONTROL BITS DATA BITS
DIN10110010P D H 1P D H 0P D G 1P D G 0P D F1 P D F0 P D E 1P D E 0
DATA CONTROL BITS DATA BITS
DIN10110100P D C H P D C GP D C FP D C E P D C D P D C C P D C BP D C A
X = Don’t care.
X = Don’t care.
Table 12. Settling-Time-Mode Write Command
DATA CONTROL BITS DATA BITS
DIN10111000S P D H S P D GS P D FS P D E S P D D S P D C S P D BS P D A
X = Don’t care.
Shutdown-Mode Bits (PD_0, PD_1)
Use the shutdown-mode bits and control bits to
shut down each DAC independently. The shutdown-
mode bits determine the output state of the selected
channels. The shutdown-control bits put the selected
channels into shutdown-mode. To select the shutdown
mode for DACA–DACH, set PD_0 and PD_1 according
to Table 8 (where “_” is replaced with one of the select-
ed channels (A–H)). The three possible states for unity-
gain versions are 1) normal operation, 2) shutdown with
1kΩ output impedance, and 3) shutdown with 100kΩ
output impedance. The three possible states for force-
sense versions are 1) normal operation, 2) shutdown
with 1kΩ output impedance, and 3) shutdown with the
output in a high-impedance state. Tables 9 and 10
show the commands for writing to the shutdown-mode
bits. Table 11 shows the commands for writing the
shutdown-control bits. This command is required to put
the selected channels into shutdown.
Always write the shutdown-mode-bits command first
and then write the shutdown-control-bits command to
properly shut down the selected channels. The shut-
down-control-bits command can be written at any time
after the shutdown-mode-bits command. It does not
have to immediately follow the shutdown-mode-bits
command.
Settling-Time-Mode Bits (SPD_)
The settling-time-mode bits select the settling time (FAST
mode or SLOW mode) of the MAX5590–MAX5595.
Set SPD_ = 1 to select FAST mode or set SPD_ = 0 to
select SLOW mode, where “_” is replaced by A, B, or C
and so on through H, depending on the selected chan-
nel (Table 12). FAST mode provides a 3µs maximum set-
tling time, and SLOW mode provides a 6µs maximum
settling time.
Table 8. Shutdown-Mode Bits
PD_1 PD_0 DESCRIPTIONS
00
Shutdown with 1kΩ termination to ground
on DAC_ output.
01
Shutdown with 100kΩ termination to
ground on DAC_ output for unity-gain
versions. Shutdown with high-impedance
output for force-sense versions.
1 0 Ignored.
11
DAC_ is powered up in its normal
operating mode.