max5500 Maxim Integrated Products, Inc., max5500 Datasheet - Page 12

• Manufacturer Part Number: max5500
• Description: Low-power, Quad, 12-bit Voltage-output Dacs With Serial Interface
• Manufacturer: Maxim Integrated Products, Inc.

Low-Power, Quad, 12-Bit
Voltage-Output DACs with Serial Interface
For a unipolar output, the output voltages and the refer-
ence inputs are of the same polarity. Figure 9 shows
the MAX5500/MAX5501 unipolar output circuit, which is
also the typical operating circuit. Table 2 lists the unipo-
lar output codes.
See Figure 10 for rail-to-rail outputs. Figure 10 shows
the MAX5500/MAX5501 with the output amplifiers con-
figured with a closed-loop gain of +2 to provide 0 to 5V
full-scale range with a 2.5V external reference voltage.
Table 2. Unipolar Code Table
Table 3. Bipolar Code Table
12
Note: 1 LSB = (V
1 1 1 1
1 0 0 0
0 1 1 1
0 0 0 0
0 0 0 0
1000
1 1 1 1
1 0 0 0
0 1 1 1
0 0 0 0
0 0 0 0
1000
MSB
MSB
______________________________________________________________________________________
DAC CONTENTS
DAC CONTENTS
1 1 1 1
0 0 0 0
1 1 1 1
0 0 0 0
0 0 0 0
0000
1 1 1 1
0 0 0 0
1 1 1 1
0 0 0 0
0 0 0 0
0000
Applications Information
REF
)
(
1 1 1 1
0 0 0 0
1 1 1 1
0 0 0 1
0 0 0 0
0001
1 1 1 1
0 0 0 0
1 1 1 1
0 0 0 1
0 0 0 0
0001
LSB
LSB
4096
1
)
+V
-V
REF
REF
ANALOG OUTPUT
ANALOG OUTPUT
+V
+V
Unipolar Output
+V
+V
+V
+V
-V
-V
(
(
REF
REF
REF
REF
REF
REF
REF
REF
———
———
2048
2048
2048
4096
(
(
0V
(
(
(
(
(
(
0V
———
———
———
———
———
———
———
———
2047
2048
2048
2047
2048
2048
4095
4096
2047
4096
4096
4096
2049
)
)
1
1
1
= ————
= -V
+V
)
)
)
)
)
)
)
)
REF
REF
2
Figure 11 shows the MAX5500/MAX5501 configured for
bipolar operation.
where NB is the numeric value of the DAC’s binary
input code. Table 3 shows digital codes (offset binary)
and corresponding output voltages for the circuit of
Figure 11.
Figure 9. Unipolar Output Circuit
Figure 10. Unipolar Rail-to-Rail Output Circuit
MAX5500
MAX5501
V
MAX5500
MAX5501
REFAB
= V
REFCD
V
REFAB
REFAB
OUT
= 2.5V
REFERENCE INPUTS
REFERENCE INPUTS
DAC A
DAC B
DAC C
DAC D
= V
DAC A
DAC B
DAC C
DAC D
AGND
AGND
REF
REFCD
REFCD
[(2NB/4096) - 1]
DGND
DGND
+5V
V
DD
+5V
V
DD
Bipolar Output
FBA
OUTA
FBB
OUTB
FBC
OUTC
FBD
OUTD
FBA
FBB
FBC
FBD
10kΩ
10kΩ
10kΩ
10kΩ
OUTA
OUTB
OUTC
OUTD
10kΩ
10kΩ
10kΩ
10kΩ