MAX5290–MAX5295
Buffered, Fast-Settling, Dual, 12-/10-/8-Bit,
Voltage-Output DACs
22 ______________________________________________________________________________________
Table 9. Shutdown-Mode Write Command
Table 10. Shutdown-Mode Bits Write Example
Table 11. Shutdown-Mode Read Command
DATA CONTROL BITS DATA BITS
DIN 1 1 1 0 0 1 0 X X X X X PDB1 PDB0 PDA1 PDA0
DATA CONTROL BITS DATA BITS
DIN 1 1 1 0 0 1 0 X X X X X 0 1 0 0
DATA CONTROL BITS DATA BITS
DIN 1110011XXXXXXXXX
DOUTRB X X X XXXXXXXXXPDB1 PDB0 PDA1 PDA0
X = Don’t care.
X = Don’t care.
Table 12. Settling-Time-Mode Write Command
DATA CONTROL BITS DATA BITS
DIN 1 1 1 0 1 1 0 X X X X X X X SPDB SPDA
X = Don’t care.
X = Don’t care.
Select Bits Programming Example:
To load DAC register B from input register B while
keeping channel A unchanged, set MB = 1 and MA =
0, as in the command in Table 7.
Shutdown-Mode Bits (PDA0, PDA1, PDB0, PDB1)
Use the shutdown-mode bits to shut down each DAC
independently. Set PD_0 and PD_1 according to Table
8 to select the shutdown mode for DAC_, where “_” is
replaced with A or B depending on the selected chan-
nel. The three possible states for unity-gain versions
are 1) normal operation, 2) shutdown with 1kΩ output
impedance, and 3) shutdown with 100kΩ output imped-
ance. The three possible states for force-sense ver-
sions are 1) normal operation, 2) shutdown with 1kΩ
output impedance, and 3) shutdown with high-imped-
ance output. Table 9 shows the command for writing to
the shutdown mode bits.
Shutdown-Mode Bits Write Example:
To put a unity-gain version’s DACA into shutdown
mode with internal 1kΩ termination to ground and
DACB into the shutdown mode with the internal 100kΩ
termination to ground, use the command in Table 10
(applicable to unity-gain output only).
To read back the shutdown-mode bits, use the com-
mand in Table 11.
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.
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