MAX5354 Maxim, MAX5354 Datasheet - Page 12

• Manufacturer Part Number: MAX5354
• Description: 10-Bit Voltage-Output DACs in 8-Pin MAX
• Manufacturer: Maxim

Figure 7 shows a method of connecting several
MAX5354/MAX5355s. In this configuration, the clock
and the data bus are common to all devices, and sepa-
rate chip-select lines are used for each IC.
For a unipolar output, the output voltage and the refer-
ence input have the same polarity. Figure 8 shows the
MAX5354/MAX5355 unipolar output circuit, which is
also the typical operating circuit. Table 2 lists the unipo-
lar output codes.
Figure 9 illustrates a rail-to-rail output configuration.
This circuit shows the MAX5354 with the output amplifi-
er configured for a closed-loop gain of +2, to provide a
0V to 5V full-scale range when a 2.5V reference is
used. When the MAX5355 is used with a 1.25V refer-
ence, this circuit provides a 0V to 2.5V full-scale range.
The MAX5354/MAX5355 output can be configured for
bipolar operation using Figure 10’s circuit, according to
the following equation:
where NB is the numeric value of the DAC’s binary
input code. Table 3 shows digital codes (offset binary)
and corresponding output voltage for Figure 10’s circuit.
10-Bit Voltage-Output DACs
in 8-Pin µMAX
Figure 7. Multiple MAX5354/MAX5355s Sharing Common DIN and SCLK Lines
12
__________Applications Information
______________________________________________________________________________________
SCLK
CS1
CS2
CS3
DIN
V
OUT
= V
REF
[(2NB / 1024) - 1]
CS
SCLK
DIN
MAX5354
MAX5355
Unipolar Output
Bipolar Output
CS
SCLK
DIN
MAX5354
MAX5355
In applications where the reference has AC-signal com-
ponents, the MAX5354/MAX5355 have multiplying
capability within the reference input range specifica-
tions. Figure 11 shows a technique for applying a sine-
wave signal to the reference input where the AC signal
is offset before being applied to REF. The reference
voltage must never be more negative than GND.
Table 2. Unipolar Code Table
NOTE: ( ) are for sub-bits.
MSB
1 1 1 1 1 1 1 1 1 1 ( 0 0 0 )
1 0 0 0 0 0 0 0 0 1 ( 0 0 0 )
1 0 0 0 0 0 0 0 0 0 ( 0 0 0 )
0 1 1 1 1 1 1 1 1 1 ( 0 0 0 )
0 0 0 0 0 0 0 0 0 1 ( 0 0 0 )
0 0 0 0 0 0 0 0 0 0 ( 0 0 0 )
DAC CONTENTS
CS
SCLK
DIN
LSB
MAX5354
MAX5355
Using an AC Reference
+V
REF
ANALOG OUTPUT
+V
+V
+V
+V
1024
REF
REF
REF
REF
512
0V
TO OTHER
SERIAL DEVICES
1024
1024
1024
1024
1023
513
511
1
V
REF
2