Datasheet

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Digitalinterfaceconnectionsomittedforclarity.
SwitchesS1andS2areclosed.V mustbepowered.
DD
Analog
Power
Supply
Load
V
REF
X
R
FB
X
I
OUT
X
V
DD
V
CC
V
OUT
V
EE
DGND
FromotherDACsA
GND
R R R
15V
15V
5V
R
R
2R
S2 S1
A1
2R 2R 2R
5kW
A
GND
F
A
GND
X
DAC8814
SBAS338D – JANUARY 2005 – REVISED SEPTEMBER 2006
Figure 26 shows the gain versus 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, a clean power-supply with low ripple voltage capability should be used. Switching power supplies are
usually not suitable for this application because of the higher ripple voltage and P
SS
frequency-dependent
characteristics. It is best to derive the DAC8814 5-V supply from the system analog supply voltages. (Do not use
the digital 5-V supply.) See Figure 59 .
Figure 59. Recommended Kelvin-Sensed Hookup
17
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