Gain 1 +

V

O

V

I1

+

2 x 150 kW

R

I1

V

V

(6)

Gain 2 +

V

O

V

I2

+

2 x 150 kW

R

I2

V

V

(7)

C

I2 +

1

2p R

I2

f

c2

(8)

C

I2 u

1

2p 150kW 20Hz

(9)

C

I2 u

53 nF

(10)

_

+

IN-

IN+

PWM

H-

Bridge

Internal

Oscillator

To Battery

GND

Bias

Circuitry

Differential

Input 1

Filter-Free Class D

SHUTDOWN

Single-Ended

Input 2

TPA2036D1

If summing a ring tone and a phone signal, the phone signal should use a differential input signal while the ring

tone might be limited to a single-ended signal. Phone gain is set at gain 1 = 0.1 V/V, and the ring-tone gain is set

to gain 2 = 2 V/V, the resistor values would be…

than 20 Hz...

Figure 31. Application Schematic With TPA2036D1 Summing Differential Input and Single-Ended Input

Signals

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