MAX509BCAP Maxim Integrated Products, MAX509BCAP Datasheet - Page 15

• Manufacturer Part Number: MAX509BCAP
• Description: IC DAC QUAD SERIAL 8BIT 20-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX509BCAP

• Settling Time: 6µs
• Number Of Bits: 8
• Data Interface: Serial
• Number Of Converters: 4
• Voltage Supply Source: Dual ±
• Power Dissipation (max): 800mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

In unipolar operation, the output voltages and the refer-
ence input(s) are the same polarity. Figures 11 and 12
show the MAX509/MAX510 unipolar configurations.
Both devices can be operated from a single supply if
the reference inputs are positive. If dual supplies are
used, the reference input can vary from V
Table 2 shows the unipolar code.
Figure 9. Suggested MAX509 PC Board Layout for Minimizing
Crosstalk (Bottom View)
Table 2. Unipolar Code Table
Note: 1LSB = (V
Unipolar-Output, 2-Quadrant Multiplication
1 1 1 1
1 0 0 0
1 0 0 0
0 1 1 1
0 0 0 0
0 0 0 0
MSB
OUTC
OUTD
REFC
REFD
DAC CONTENTS
V
DD
REF
______________________________________________________________________________________
1 1 1 1
0 0 0 1
0 0 0 0
1 1 1 1
0 0 0 1
0 0 0 0
) (2 -8 ) = +V
LSB
SYSTEM GND
REF
+V
REF
(
+V
+V
+V
+V
––––
256
ANALOG
1
OUTPUT
(
REF
REF
REF
REF
––––
256
128
)
0V
OUTB
OUTA
REFB
REFA
V
AGND
(
(
(
(
SS
––––
––––
)
––––
––––
255
256
129
256
256
256
127
SS
1
= + –
)
)
)
)
to V
V
REF
2
–––
DD
.
with Rail-to-Rail Outputs
Quad, Serial 8-Bit DACs
REFCD
Bipolar-output, 2-quadrant multiplication is achieved by
offsetting AGND positively or negatively. Table 3 shows
the bipolar code.
AGND can be biased above DGND to provide an arbi-
trary nonzero output voltage for a 0 input code, as
shown in Figure 13. The output voltage at OUTA is:
Figure 10. Suggested MAX510 PC Board Layout for Minimizing
Crosstalk (Bottom View)
Table 3. Bipolar Code Table
OUTC
OUTD
V
Bipolar-Output, 2-Quadrant Multiplication
DD
1 1 1 1
1 0 0 0
1 0 0 0
0 1 1 1
0 0 0 0
0 0 0 0
MSB
DAC CONTENTS
V
OUTA
SYSTEM GND
= V
1 1 1 1
0 0 0 1
0 0 0 0
1 1 1 1
0 0 0 1
0 0 0 0
LSB
BIAS
+ (NB/256)(V
-V
OUTB
OUTA
V
AGND
REF
REFAB
+V
+V
-V
-V
SS
ANALOG
IN
OUTPUT
REF
REF
REF
REF
(
),
––––
128
128
0V
(
(
(
(
––––
––––
127
––––
128
––––
128
127
128
128
1
)
1
= -V
)
)
)
)
REF
15