Table 12. settling-time-mode write command, Table 8. shutdown-mode bits – Rainbow Electronics MAX5295 User Manual
Page 22
MAX5290–MAX5295
Buffered, Fast-Settling, Dual, 12-/10-/8-Bit,
Voltage-Output DACs
22
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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
1
1
1
0
0
1
1
X
X
X
X
X
X
X
X
X
DOUTRB
X
X
X
X
X
X
X
X
X
X
X
X
PDB1 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 1k
Ω output
impedance, and 3) shutdown with 100k
Ω output imped-
ance. The three possible states for force-sense ver-
sions are 1) normal operation, 2) shutdown with 1k
Ω
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 1k
Ω termination to ground and
DACB into the shutdown mode with the internal 100k
Ω
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
0
0
Shutdown with 1k
Ω termination to ground
on DAC_ output.
0
1
Shutdown with 100k
Ω termination to
ground on DAC_ output for unity-gain
versions. Shutdown with high-impedance
output for force-sense versions.
1
0
Ignored.
1
1
DAC_ is powered up in its normal operating
mode.