Rainbow Electronics MAX5351 - Manual (Page 14)

MAX535/MAX5351
Low-Power, 13-Bit Voltage-Output DACs
with Serial Interface
14 ______________________________________________________________________________________
Power-Supply Considerations
On power-up, the input and DAC registers are cleared
(set to zero code).
For rated MAX535/MAX5351 performance, REF should
be at least 1.4V below V
DD . Bypass V DD with a 4.7µF
capacitor in parallel with a 0.1µF capacitor to GND.
Use short lead lengths and place the bypass capaci-
tors as close to the supply pins as possible.
Grounding and Layout Considerations
Digital or AC transient signals on GND can create noise
at the analog output. Tie GND to the highest-quality
ground available.
Good printed circuit board ground layout minimizes
crosstalk between the DAC output, reference input, and
digital input. Reduce crosstalk by keeping analog lines
away from digital lines. Wire-wrapped boards are not
recommended.
DAC
V OUT
+V
+5V/+3.3V
V-
R1 = R2 = 10k Ω ±0.1%
MAX535
MAX5351
REF
R1 R2
FB
OUT
V DD
GND
Figure 10. Bipolar Output Circuit
DAC
OUT
MAX535
MAX5351
10k
26k
REF V DD
GND
+5V/
+3.3V
AC
REFERENCE
INPUT
500mVp-p
MAX495
+5V/+3.3V
Figure 11. AC Reference Input Circuit
DAC
MAX535
MAX5351
REF
OUT
R
I OUT
2N3904
V L
FB
+5V/
+3.3V
V
DD
GND
Figure 12. Digitally Programmable Current Source