+5V, Low-Power, Voltage-Output,
Serial 12-Bit DACs
MAX531/MAX538/MAX539
SCLK
SK
SO
I/O
SI
SCLK
SCK
MOSI
I/O
MISO
CPOL = 0, CPHA = 0
THE DOUT-SI CONNECTION IS NOT REQUIRED FOR WRITING TO THE
DEVICE, BUT MAY BE USED FOR VERIFYING DATA TRANSFER .
THE DOUT-MISO CONNECTION IS NOT REQUIRED FOR WRITING TO THE
DEVICE, BUT MAY BE USED FOR VERIFYING DATA TRANSFER .
MAX531
MAX538
MAX539
DIN
CS
DOUT
MICROWIRE
PORT
MAX531
MAX538
MAX539
DIN
CS
DOUT
SPI
PORT
Figure 4. Microwire Connection
+5V
V
DD
BIPOFF
Figure 5. SPI/QSPI Connection
+5V
V
DD
REFIN
REFOUT
33µF
AGND
DGND
REFIN
REFOUT
33µF
MAX531
RFB
BIPOFF
AGND
MAX531
RFB
VOUT
VOUT
V
OUT
DGND
V
OUT
V
SS
0V TO -5V
G = +1
V
SS
0V TO -5V
G = +2
Figure 6. Unipolar Configuration (0V to +2.048V Output)
Figure 7. Unipolar Configuration (0V to +4.096V Output)
Table 1. Unipolar Binary Code Table
(0V to V
REFIN
Output), Gain = +1
INPUT
1111
1000
1000
0111
0000
0000
1111
0000
0000
1111
0000
0000
1111
0001
0000
1111
0001
0000
OUTPUT
(V
REFIN
)
(V
REFIN
)
(V
REFIN
)
4095
4096
2049
4096
Table 2. Unipolar Binary Code Table
(0V to 2V
REFIN
Output), Gain = +2
INPUT
1111
1000
1000
0111
0000
0000
1111
0000
0000
1111
0000
0000
1111
0001
0000
1111
0001
0000
OUTPUT
+2 (V
REFIN
)
+2 (V
REFIN
)
+2 (V
REFIN
)
+2 (V
REFIN
)
+2 (V
REFIN
)
4095
4096
2049
4096
2048
= +V
REFIN
4096
2047
4096
1
4096
2048
= +V
REFIN
/ 2
4096
2047
4096
1
4096
(V
REFIN
)
(V
REFIN
)
OV
OV
11
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
