LF147, LF347-N
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SNOSBH1D –MAY 1999–REVISED MARCH 2013
Typical Applications
Figure 23. Digitally Selectable Precision Attenuator
All resistors 1% tolerance
•
Accuracy of better than 0.4% with standard 1% value resistors
No offset adjustment necessary
Expandable to any number of stages
Very high input impedance
•
•
A1
A2
A3
VO
Attenuation
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
−1 dB
−2 dB
−3 dB
−4 dB
−5 dB
−6 dB
−7 dB
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