Datasheet

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Analog
Power
Supply
Load
15V
2R
5V
R
15V
A1
R R R
2R 2R 2R R
5 kW
S2 S1
DGND
DGND
V X
REF
V
DD
R X
FB
I X
OUT
V
OUT
V
CC
V
EE
A X
GND
Digitalinterfaceconnectionsomittedforclarity.
SwitchesS1andS2areclosed,V mustbepowered.
DD
16
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
A0
A1
A
B
DAC
Decode
Input
Register
R
Input
Register
R
DACA
Register
R
DACB
Register
R
DAC A
DAC B
Set
MSB
Power-
on
Reset
DGND MSB LDAC RS
V
DD
CS
CLK
SDI
V AB
REF
I A
OUT
A A
GND
R B
FB
I B
OUT
A B
GND
EN
Set
MSB
R B
FB
DAC8812
SBAS349B – AUGUST 2005 – REVISED FEBRUARY 2007
Figure 15 shows the gain vs frequency performance at various attenuation settings using a 3 pF external
feedback capacitor connected across the I
OUT
X and R
FB
X terminals. In order to maintain good analog
performance, power-supply bypassing of 0.01 µ F, in parallel with 1 µ F, is recommended. Under these
conditions, clean power supply with low ripple voltage capability should be used. Switching power supplies is
usually not suitable for this application due to the higher ripple voltage and P
SS
frequency-dependent
characteristics. It is best to derive the DAC8812 5-V supply from the system analog supply voltages (do not use
the digital 5-V supply); see Figure 31 .
Figure 31. Recommended Kelvin-Sensed Hookup
Figure 32. System Level Digital Interfacing
12
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