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
DAC8803
SBAS340C – JANUARY 2005 – REVISED FEBRUARY 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 µF, in parallel with 1 µF, is recommended. Under these conditions,
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 DAC8803 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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