Datasheet

MAX5500/MAX5501
Low-Power, Quad, 12-Bit
Voltage-Output DACs with Serial Interface
12 ______________________________________________________________________________________
DAC CONTENTS
ANALOG OUTPUT
MSB LSB
4095
1111 1111 1111 +V
REF
( ——— )
4096
2049
1000 0000 0001 +V
REF
( ——— )
4096
2048 +V
REF
1000 0000 0000 +V
REF
( ——— )= ————
4096 2
2047
0111 1111 1111 +V
REF
( ——— )
4096
1
0000 0000 0001 +V
REF
( ——— )
4096
0000 0000 0000 0V
Table 2. Unipolar Code Table
DAC CONTENTS
ANALOG OUTPUT
MSB LSB
2047
1111 1111 1111 +V
REF
( ——— )
2048
1
1000 0000 0001 +V
REF
( ——— )
2048
1000 0000 0000 0V
1
0111 1111 1111 -V
REF
( ——— )
2048
2047
0000 0000 0001 -V
REF
(
——— )
2048
2048
0000 0000 0000 -V
REF
(
——— )= -V
REF
2048
Table 3. Bipolar Code Table
Note: 1 LSB = (V
REF
) (
4096
)
1
MAX5500
MAX5501
DAC A
DAC B
DAC C
DAC D
OUTA
FBA
FBB
FBC
FBD
OUTB
OUTC
OUTD
DGNDAGND
REFAB
REFCD
REFERENCE INPUTS
+5V
V
DD
Figure 9. Unipolar Output Circuit
MAX5500
MAX5501
DAC A
DAC B
DAC C
DAC D
V
REFAB
= V
REFCD
= 2.5V
OUTA
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
OUTB
OUTC
OUTD
DGNDAGND
REFAB
REFCD
REFERENCE INPUTS
+5V
V
DD
FBA
FBB
FBC
FBD
Figure 10. Unipolar Rail-to-Rail Output Circuit
Applications Information
Unipolar Output
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.
Bipolar Output
Figure 11 shows the MAX5500/MAX5501 configured for
bipolar operation.
V
OUT
= V
REF
[(2NB/4096) - 1]
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.