max5581aeupt Maxim Integrated Products, Inc., max5581aeupt Datasheet - Page 25

• Manufacturer Part Number: max5581aeupt
• Description: Buffered, Fast-settling, Quad, 12-/10-/8-bit, Voltage-output Dacs
• Manufacturer: Maxim Integrated Products, Inc.

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–DACD, set PD_0 and PD_1 according
to Table 8 (where “_” is replaced with one of the select-
ed channels (A–D)). The three possible states for unity-
gain versions are 1) normal operation, 2) shutdown with
Table 8. Shutdown-Mode Bits
Table 9. Shutdown-Mode Write Command
X = Don’t care.
Table 10. Shutdown-Mode-Bits Write Example
X = Don’t care.
Table 11. Settling-Time-Mode Write Command
X = Don’t care.
DATA
DATA
DATA
PD_1
DIN
DIN
DIN
0
0
1
1
PD_0
1
1
1
0
1
0
1
1
1
1
Shutdown with 1kΩ termination to ground
on DAC_ output.
Shutdown with 100kΩ termination to
ground on DAC_ output for unity-gain
versions. Shutdown with high-impedance
output for force-sense versions.
Ignored.
DAC_ is powered up in its normal
operating mode.
______________________________________________________________________________________
Shutdown-Mode Bits (PD_0, PD_1)
1
1
1
CONTROL BITS
CONTROL BITS
CONTROL BITS
DESCRIPTION
0
0
0
12-/10-/8-Bit, Voltage-Output DACs
1
0
0
1
1
1
Buffered, Fast-Settling, Quad,
0
0
0
X
X
X
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. Table 9 shows the com-
mands for writing to the shutdown-mode bits. Table 10
shows an example of writing the shutdown-control bits.
This command shuts down DACA with 1kΩ to ground
and shuts down DACB–DACD with 100kΩ to ground.
Always write the shutdown-mode-bits command first and
then write the shutdown-control-bits command to proper-
ly shut down the selected channels. The shutdown-
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.
The settling-time-mode bits select the settling time (FAST
mode or SLOW mode) of the MAX5580–MAX5585.
Set SPD_ = 1 to select FAST mode or set SPD_ = 0 to
select SLOW mode, where “_” is replaced by A, B, C, or
D, depending on the selected channel (Table 11). FAST
mode provides a 3µs maximum settling time, and SLOW
mode provides a 6µs maximum settling time.
P D D 1 P D D 0 P D C 1 P D C 0 P D B1 P D B0
X
0
1
X
0
X
Settling-Time-Mode Bits (SPD_)
DATA BITS
DATA BITS
DATA BITS
1
X
S P D D S P D C S P D B S P D A
0
1
P D A1 P D A0
0
0
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