MAX5172 MAXIM [Maxim Integrated Products], MAX5172 Datasheet - Page 13

• Manufacturer Part Number: MAX5172
• Description: Low-Power, Serial, 14-Bit DACs with Voltage Output
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 6 shows the MAX5170/MAX5172 configured for
unipolar, rail-to-rail operation with a gain of +1.638V/V.
Table 2 lists the codes for unipolar output voltages. The
maximum output voltage is limited to V
to introduce an offset voltage as shown in Figure 7 and
described in the Offset and Buffer Configurations section.
Figure 8 shows the MAX5170/MAX5172 configured for
bipolar output operation. The output voltage is given by
the following equation (OS = AGND):
where N represents the numeric value of the DAC’s
binary input code, V
reference. Table 3 shows digital codes and the corre-
sponding output voltage for Figure 8’s circuit.
Figure 6. Unipolar Output Circuit (Rail-to-Rail)
Table 2. Unipolar Code Table
(Circuit of Figure 6)
MSB
11 1111 1111 1111
10 0000 0000 0001
10 0000 0000 0000
01 1111 1111 1111
00 0000 0000 0001
00 0000 0000 0000
DAC CONTENTS
REF
V
OUT
Applications Information
DAC
MAX5170
MAX5172
______________________________________________________________________________________
LSB
REF
V
REF
AGND
is the voltage of the external
+V
+V
+V
+V
+5V/+3V
16 384
V
+V
REF
2
DD
REF
REF
REF
,
ANALOG OUTPUT
REF
N
(16383/16384)
(8193/16384)
(8192/16384)
(8191/16384)
Unipolar Output
(1/16384)
DGND
Bipolar Output
DD
1
0
. Use the OS pin
Low-Power, Serial, 14-Bit DACs
OS
·
OUT
1.638
·
·
·
·
1.638
1.638
1.638
1.638
Figure 7. Setting OS for Output Offset
Figure 8. Bipolar Output Circuit
Table 3. Bipolar Code Table
(Circuit of Figure 8)
MSB
REF
11 1111 1111 1111
10 0000 0000 0001
10 0000 0000 0000
01 1111 1111 1111
00 0000 0000 0001
00 0000 0000 0000
DAC CONTENTS
DAC
MAX5170
MAX5172
with Voltage Output
REF
+5V/+3V
DGND
V
DAC
DD
MAX5170
MAX5172
LSB
AGND
AGND
+5V/+3V
+V
+V
+V
+V
V
OUT
OS
DD
+V
REF
REF
REF
REF
ANALOG OUTPUT
REF
10k
[(2 · 16383/16384) - 1]
[(2 · 8193/16384) - 1]
[(2 · 8192/16384) - 1]
[(2 · 8191/16384) - 1]
DGND
[(2 · 1/16384) - 1]
-V
OS
REF
OUT
V+
V-
10k
V
OS
V
OUT
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