MAX5156 Maxim, MAX5156 Datasheet - Page 13

• Manufacturer Part Number: MAX5156
• Description: Low-Power / Dual / 12-Bit Voltage-Output DACs with Configurable Outputs
• Manufacturer: Maxim

Figure 8. Multiple MAX5156/MAX5157s Sharing a Common DIN Line
Figure 9. Unipolar Output Circuit
Figure 9 depicts the MAX5156/MAX5157 configured for
unity-gain, unipolar operation. Table 2 lists the unipolar
output codes. To increase dynamic range, specific
gain configurations can be used as shown in Figure 10.
__________Applications Information
Low-Power, Dual, 12-Bit Voltage-Output DACs
SCLK
CS1
CS2
CS3
DIN
REF_
DAC
MAX5156
MAX5157
______________________________________________________________________________________
AGND
+5V/+3V
CS
SCLK
DIN
V
DD
MAX5156
MAX5157
DGND
Unipolar Output
FB_
OUT_
with Configurable Outputs
CS
SCLK
DIN
MAX5156
MAX5157
The MAX5156/MAX5157 can be configured for a bipo-
lar output, as shown in Figure 11. The output voltage is
given by the equation:
where NB represents the numeric value of the DAC’s
binary input code. Table 3 shows digital codes and the
corresponding output voltage for Figure 11’s circuit.
Table 2. Unipolar Code Table (Gain = +1)
Note: ( ) are for the sub bit.
1 1 1 1
1 0 0 0
1 0 0 0
0 1 1 1
0 0 0 0
0 0 0 0
MSB
DAC CONTENTS
0 0 0 0
1 1 1 1
0 0 0 0
1 1 1 1
0 0 0 0
0 0 0 0
V
OUT
= V
1 1 1 1 ( 0 )
0 0 0 1 ( 0 )
0 0 0 0 ( 0 )
1 1 1 1 ( 0 )
0 0 0 1 ( 0 )
0 0 0 0 ( 0 )
REF
CS
SCLK
DIN
LSB
MAX5156
MAX5157
[((2 x NB) / 4096) - 1]
+V
ANALOG OUTPUT
+V
+V
REF
+V
+V
REF
REF
REF
REF
Bipolar Output
2048
4096
2049
4096
2047
4096
4096
4095
4096
0V
TO OTHER
SERIAL DEVICES
1
V
REF
2
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