PVdd

AVdd

INL-

INL+

INR-

INR+

SDR

AGND

PGND

OUTL+

OUTL-

OUTR+

OUTR-

Shutdown

Control

TPA2012D2

To power supply

10 µF

DAC or CODEC

SDL

G1

G0

0.1 µF

1 µF

Copyright © 2016, Texas Instruments Incorporated

1 µF

1 µF

1 µF

I

I C

1

C

(2 R f )

=

p

C

I

I

1

f

(2 R C )

=

p

18

TPA2012D2

SLOS438F – DECEMBER 2004 – REVISED MARCH 2017

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Product Folder Links: TPA2012D2

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Copyright © 2004–2017, Texas Instruments Incorporated

Equation 1.

(1)

The value of the input capacitor is important to consider as it directly affects the bass (low frequency)

performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the

corner frequency can be set to block low frequencies in this application. Not using input capacitors can increase

output offset.

Equation 2 is used to solve for the input coupling capacitance.

(2)

If the corner frequency is within the audio band, the capacitors should have a tolerance of ±10% or better,

because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below.

10.2.1.3 Application Curves

For application curves, see the figures listed in Table 4.

(1)

All figure numbers have a hyperlink to a figure in the Typical Characteristics.

Table 4. Table of Graphs

DESCRIPTION

THD+N vs Output power

Figure 1

THD+N vs Frequency

Figure 5

Power dissipation vs Output power

Figure 24

Output power vs Supply voltage

Figure 32

10.2.2 TPA2012D2 With Single-Ended Input Signal

Figure 38. Typical Application Schematic With Single-Ended Input Signal