Datasheet

MAX548A/MAX549A/MAX550A
+2.5V to +5.5V, Low-Power, Single/Dual,
8-Bit Voltage-Output DACs in µMAX Package
10 ______________________________________________________________________________________
Table 2. MAX548A Serial-Interface Programming Commands (continued)
COMMANDS FOR POWERING DOWN
X 1X 0 X 1 0
CONTROL BYTE
8-Bit DAC Data X
Load DAC B input register and power down DAC
B. DAC A registers unchanged.
X
X 1X 0 X 1 1 8-Bit DAC Data X
Load both DAC input registers and power down
both DACs. Both DAC registers unchanged
X
X 1X 1 0 1 0 8-Bit DAC Data X
Load DAC B input register, power down DAC B,
and update both DAC registers. DAC A input
register unchanged.
X
X = Don’t care
X
1X 1 0 0 1 8-Bit DAC Data X
Load DAC A input register, power down DAC A,
and update both DAC registers. DAC B input
register unchanged.
X
X 1X 0 X 0 1 8-Bit DAC Data X
Load DAC A input register and power down DAC
A. DAC B registers unchanged.
X
X 1X 1 0 1 1 8-Bit DAC Data X
Load both DAC input registers, power down both
DACs, and update both DAC registers.
X
X 1X 1 1 0 1 8-Bit DAC Data 0
Load DAC A input register, power down
DAC A, and update both DAC registers. DAC B
input register unchanged.
X
X 1X 1 1 1 0 8-Bit DAC Data 0
Load DAC B input register, power down
DAC B, and update both DAC registers. DAC A
input register unchanged.
X
X 1X 1 1 1 1 8-Bit DAC Data 0
Load both DAC input registers and power down
both DACs. Update both DAC registers.
X
X 1X 1 1 0 1 8-Bit DAC Data 1
Load DAC A input register and power down DAC
A. While powered down, on LDAC’s falling edge,
update both DAC registers. DAC B input register
unchanged.
X
X 1X 1 1 1 0 8-Bit DAC Data 1
Load DAC B input register and power down DAC
B. While powered down, on LDAC’s falling edge,
update both DAC registers. DAC A input register
unchanged.
X
X 1X 1 1 1 1 8-Bit DAC Data 1
Load both DAC input registers and power down
both DACs. While powered down, on LDAC’s
falling edge, update both DAC registers.
X
COMMAND
(Commands executed on CS’s rising edge)
LDAC
DATA BYTE
Loaded LastLoaded First
Pin 6D7........D0UB1 A0A1C0C1C2UB3UB2
COMMANDS POWERING DOWN AND LOADING INPUT REGISTER(S) ONLY
COMMANDS POWERING DOWN AND UPDATING DAC REGISTER(S)
COMMANDS POWERING DOWN AND UTILIZING THE ASYNCHRONOUS LOAD FUNCTION