MAX525 Maxim, MAX525 Datasheet - Page 15

• Manufacturer Part Number: MAX525
• Description: Low-Power / Quad / 12-Bit Voltage-Output DAC with Serial Interface
• Manufacturer: Maxim

On power-up, all input and DAC registers are cleared
(set to zero code) and DOUT is in Mode 0 (serial data
is shifted out of DOUT on the clock’s falling edge).
For rated MAX525 performance, limit REFAB/REFCD to
less than 1.4V below V
capacitor in parallel with a 0.1µF capacitor to AGND.
Use short lead lengths and place the bypass capaci-
tors as close to the supply pins as possible.
Digital or AC transient signals between AGND and
DGND can create noise at the analog outputs. Tie
AGND and DGND together at the DAC, then tie this
point to the highest-quality ground available.
Good printed circuit board ground layout minimizes
crosstalk between DAC outputs, reference inputs, and
digital inputs. Reduce crosstalk by keeping analog
lines away from digital lines. Wire-wrapped boards are
not recommended.
Figure 13. Digitally Programmable Current Source
Low-Power, Quad, 12-Bit Voltage-Output DAC
Grounding and Layout Considerations
REF_
DAC_
Power-Supply Considerations
______________________________________________________________________________________
MAX525
DD
. Bypass V
OUT_
FB_
DD
2N3904
V
L
with a 4.7µF
R
I
OUT
__________________Pin Configuration
with Serial Interface
TOP VIEW
REFAB
AGND
OUTA
OUTB
SCLK
FBA
FBB
DIN
CL
CS
10
1
2
3
4
5
6
7
8
9
DIP/SSOP
MAX525
20
19
18
17
16
15
14
13
12
11
V
FBD
OUTD
OUTC
FBC
REFCD
PDL
UPO
DOUT
DGND
DD
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