MAX522 Maxim, MAX522 Datasheet - Page 10

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

The digital inputs are compatible with CMOS logic.
Supply current increases slightly when toggling the
logic inputs through the transition zone between
(0.3)(V
The MAX522 serial interface is compatible with
Microwire, SPI, and QSPI. For SPI, clear the CPOL and
CPHA bits (CPOL = 0 and CPHA = 0). CPOL = 0 sets
the inactive clock state to zero and CPHA = 0 changes
data at the falling edge of SCLK. This setting allows SPI
to run at full clock speeds (0.5MHz). If a serial port is
not available on your µP, three bits of a parallel port can
be used to emulate a serial port by bit manipulation.
Minimize digital feedthrough at the voltage outputs by
operating the serial clock only when necessary.
Dual, 8-Bit, Voltage-Output
Serial DAC in 8-Pin SO Package
Figure 3. MAX522 Detailed Serial-Interface Timing Diagram
10
______________________________________________________________________________________
DD
SCLK
DIN
) and (0.7)(V
CS
DD
).
t
CSS
t
Microprocessor Interfacing
DS
t
DH
t
CH
Digital Inputs
t
CL
Table 4. Code Table
B7
1
1
1
0
0
0
Note:
1LSB
ANALOG OUTPUT
B6
1
0
0
1
0
0
DAC CONTENTS
B5
1
0
0
1
0
0
REF
B4
1
0
0
1
0
0
B3
t
CSH
1
0
0
1
0
0
2
B2
1
0
0
1
0
0
8
REF
B1
1
0
0
1
0
0
REF
t
B0
CSPWH
1
1
0
1
1
0
256
0V
D
REF
REF
REF
REF
REF
256
1
where D = Decimal
Value of Digital Input
ANALOG
OUTPUT
128
256
129
255
256
256
127
256
256
1
REF
2