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TPA2036D1 Datasheet(PDF) 12 Page - Texas Instruments

Part No. TPA2036D1
Description  2.5-W MONO CLASS-D AUDIO AMPLIFIER WITH AUTO-RECOVERY
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPA2036D1 Datasheet(HTML) 12 Page - Texas Instruments

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SUMMING INPUT SIGNALS WITH THE TPA2036D1
Summing Two Differential Input Signals
Gain 1 +
V
O
V
I1
+
2 x 150 kW
R
I1
V
V
(4)
Gain 2 +
V
O
V
I2
+
2 x 150 kW
R
I2
V
V
(5)
_
+
IN-
IN+
PWM
H-
Bridge
VO+
VO-
Internal
Oscillator
CS
To Battery
VDD
GND
Bias
Circuitry
RI2
RI2
+
-
Differential
Input 1
SHUTDOWN
RI1
RI1
+
-
Differential
Input 2
Filter-Free Class D
Summing a Differential Input Signal and a Single-Ended Input Signal
TPA2036D1
SLOS589 – OCTOBER 2008.............................................................................................................................................................................................. www.ti.com
Most wireless phones or PDAs need to sum signals at the audio power amplifier or just have two signal sources
that need separate gain. The TPA2036D1 makes it easy to sum signals or use separate signal sources with
different gains. Many phones now use the same speaker for the earpiece and ringer, where the wireless phone
would require a much lower gain for the phone earpiece than for the ringer. PDAs and phones that have stereo
headphones require summing of the right and left channels to output the stereo signal to the mono speaker.
Two extra resistors are needed for summing differential signals (a total of 5 components). The gain for each input
source can be set independently (see Equation 4 and Equation 5, and Figure 30).
If summing left and right inputs with a gain of 1 V/V, use RI1 = RI2 = 300 kΩ.
If summing a ring tone and a phone signal, set the ring-tone gain to Gain 2 = 2 V/V, and the phone gain to gain 1
= 0.1 V/V. The resistor values would be. . .
RI1 = 3 MΩ, and = RI2 = 150 kΩ.
Figure 30. Application Schematic With TPA2036D1 Summing Two Differential Inputs
Figure 31 shows how to sum a differential input signal and a single-ended input signal. Ground noise can couple
in through IN+ with this method. It is better to use differential inputs. The corner frequency of the single-ended
input is set by CI2, shown in Equation 8. To assure that each input is balanced, the single-ended input must be
driven by a low-impedance source even if the input is not in use.
12
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TPA2036D1


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