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EUA2005
DS2005 Ver 1.1 Nov. 2006
13
Summing Two Single-Ended Input Signals
Four resistors and three capacitors are needed for
summing single-ended input signals. The gain and corner
frequencies (fc1 and fc2) for each input source can be set
independently (see equations (11) through (14), and
Figure 28). Resistor, RP, and capacitor, CP, are needed on
the IN+ terminal to match the impedance on the IN−
terminal. The single-ended inputs must be driven by low
impedance sources even if one of the inputs is not
outputting an ac signal.
---------------------(11)
---------------------(12)
-----------------------------------------(13)
----------------------------------------
-(14)
-------------------------------------------(15)
------------------------------------- (16)
Figure 28. Application Schematic With EUA2005
Summing Two Single-Ended Input
1
I
R
k
150
2
1
Gain
1
I
O
V
V
Ω
×
=
=
V
V
2
I
R
k
150
2
2
Gain
2
I
O
V
V
Ω
×
=
=
V
V
()
1
c
1
I f
R
2
1
1
I
C
π
=
()
2
c
2
I f
R
2
1
2
I
C
π
=
2
I
1
I
C
C
CP
+
=
()
2
I
R
1
I
R
2
I
R
1
I
R
P
R
+
×
=
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