MAX522 Maxim, MAX522 Datasheet - Page 9

• Manufacturer Part Number: MAX522
• Description: Dual / 8-Bit / Voltage-Output Serial DAC in 8-Pin SO Package
• Manufacturer: Maxim

X =
* = Not shown, for the sake of clarity. The functions of loading and shutting down the DACs and programming the logic can be combined in a single
Figure 2. MAX522 3-Wire Serial-Interface Timing Diagram
Table 2. Serial-Interface Programming Commands
Table 3. Example of a 16-Bit Input Word
UB1
Loaded
in First
UB1
X
X
X
X
X
X
X
X
X
X
X
Don’t care.
command.
UB2
X
X
X
X
X
X
X
X
X
X
UB2
SCLK
UB3
X
DIN
CS
1
1
1
1
1
1
1
1
1
1
CONTROL
SB
UB3
0
0
1
0
1
*
*
*
*
*
1
_______________________________________________________________________________________
UB1 UB2 UB3 SB
SA
0
0
0
1
1
*
*
*
*
*
SB
UB4
0
0
0
0
0
0
0
0
0
0
0
(CONTROL BYTE)
LB
0
0
1
0
1
SA
*
*
*
*
*
0
LA
SA UB4 LB
0
0
0
1
1
*
*
*
*
*
UB4
MSB
0
Serial DAC in 8-Pin SO Package
B7
X
X
X
X
X
X
B6
X
X
X
X
X
X
LB
1
LA
B5
X
X
X
X
X
X
Dual, 8-Bit, Voltage-Output
8-Bit DAC Data
8-Bit DAC Data
8-Bit DAC Data
LA
1
B4
X
X
X
X
X
X
DATA
B3
X
X
X
X
X
X
B7
OPTIONAL
1
D7
B2
X
X
X
X
X
X
D6
B6
0
B1
D5
X
X
X
X
X
X
(DATA BYTE)
LSB
D4
B0
X
X
X
X
X
X
B5
0
D3
No Operation to DAC Registers
Unassigned Command
Load Register to DAC B
Load Register to DAC A
Load Both DAC Registers
All DACs Active
Unassigned Command
Shut Down DAC B
Shut Down DAC A
Shut Down All DACs
D2
B4
0
D1
D0
B3
0
FUNCTION
INSTRUCTION
EXECUTED
B2
0
B1
0
Loaded
in Last
B0
0
9