5V, Low-Power, Voltage-Output,
Serial 10-Bit DACs
MAX504/MAX515
CS CLR DIN DOUT
REFOUT V
DD
V
SS
5
POSITIVE OFFSET
SIGNAL
IN
REFIN
OUTPUT (LSBs)
INVERTED
R-2R DAC
2R
VOUT
4
3
2
NEGATIVE OFFSET
1
0
1
2
3
4
5
2.048V
RFB
BIPOFF
MAX504
2R
Figure 9. MAX504 Connected as Four-Quadrant Multiplier. The
unused REFOUT is connected to V
DD
.
DAC CODE (LSBs)
Figure 10. Single-Supply Offset
AC Considerations
Digital Feedthrough
High-speed serial data at any of the digital input or output
pins may couple through the DAC package and cause
internal stray capacitance to appear at the DAC output as
noise, even though
CS
is held high (see
Typical Operating
Characteristics).
This digital feedthrough is tested by hold-
ing
CS
high transmitting 0101... from DIN to DOUT.
Analog Feedthrough
Because of internal stray capacitance, higher frequency
analog input signals may couple to the output as shown in
the Analog Feedthrough vs. Frequency graph in the
Typical Operating Characteristics.
It is tested by holding
CS
high, setting the DAC code to all 0s, and sweeping
REFIN.
ANALOG GROUND PLANE
0.1µF
1
2
3
4
5
6
7
14
13
12
11
10
9
8
(a)
MAX504 BYPASSING
0.1µF
1
2
3
4
8
7
6
5
0.1µF
(b)
MAX515 BYPASSING
Figure 11. Power-Supply Bypassing
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13
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
