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