Datasheet

_
+
IN-
IN+
PWM H-
Bridge
V
O+
V
O-
Internal
Oscillator
C
S
To Battery
V
DD
GND
Bias
Circuitry
R
I2
R
I2
Differential
Input 1
Filter-Free Class D
SHUTDOWN
R
I1
R
I1
Single-Ended
Input 2
C
I2
C
I2
Gain 1 +
V
O
V
I1
+
2 x 150 kW
R
I1
ǒ
V
V
Ǔ
Gain 2 +
V
O
V
I2
+
2 x 150 kW
R
I2
ǒ
V
V
Ǔ
C
I1
+
1
ǒ
2p R
I1
f
c1
Ǔ
C
I2
+
1
ǒ
2p R
I2
f
c2
Ǔ
C
P
+ C
I1
) C
I2
R
P
+
R
I1
R
I2
ǒ
R
I1
) R
I2
Ǔ
TPA2011D1
www.ti.com SLOS626A –DECEMBER 2009–REVISED MAY 2010
Figure 32. Application Schematic With TPA2011D1 Summing Differential Input and Single-Ended Input
Signals
Summing Two Single-Ended Input Signals
Four resistors and three capacitors are needed for summing single-ended input signals. The gain and corner
frequencies (f
c1
and f
c2
) for each input source can be set independently (see Equation 11 through Equation 14,
and Figure 33). Resistor, R
P
, and capacitor, C
P
, 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)
Copyright © 2009–2010, Texas Instruments Incorporated Submit Documentation Feedback 15
Product Folder Link(s) :TPA2011D1