Rainbow Electronics MAX5157 - Manual (Page 13)

__________Applications Information
Unipolar Output
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.
Bipolar Output
The MAX5156/MAX5157 can be configured for a bipo-
lar output, as shown in Figure 11. The output voltage is
given by the equation:
V OUT = V REF [((2 x NB) / 4096) - 1]
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.
MAX5156/MAX5157
Low-Power, Dual, 12-Bit Voltage-Output DACs
with Configurable Outputs
______________________________________________________________________________________ 13
TO OTHER
SERIAL DEVICES
MAX5156
MAX5157
DIN
SCLK
CS
MAX5156
MAX5157
DIN
SCLK
CS
MAX5156
MAX5157
DIN
SCLK
CS
DIN
SCLK
CS1
CS2
CS3
Figure 8. Multiple MAX5156/MAX5157s Sharing a Common DIN Line
MAX5156
MAX5157
DAC
REF_
OUT_
FB_
DGND AGND
+5V/+3V
V DD
Figure 9. Unipolar Output Circuit
Table 2. Unipolar Code Table (Gain = +1)
0 0 0 0 0 0 0 0 0 0 0 1 ( 0 )
0V 0 0 0 0 0 0 0 0 0 0 0 0 ( 0 )
0 1 1 1 1 1 1 1 1 1 1 1 ( 0 )
1 0 0 0 0 0 0 0 0 0 0 0 ( 0 )
DAC CONTENTS
MSB LSB
1 0 0 0 0 0 0 0 0 0 0 1 ( 0 )
1 1 1 1 1 1 1 1 1 1 1 1 ( 0 )
ANALOG OUTPUT
+V
4095
4096
REF

 

+V
2049
4096 REF

 

+V
2047
4096 REF

 

+V
1
4096 REF

 

+V
2048
4096
V
2
REF
REF

 

=
Note: ( ) are for the sub bit.