TAS5721 datasheet(34/78 Pages) TI1

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OPAMP

Mute Circuit

Output

MUTE

9–12 V

–

Conventional Solution

Mute Circuit

Output

DR_SD

3.3 V

–

TAS5721 Solution

VDD

VSS

GND

VDD

VDD/2

GND

DirectPath

TAS5721

DR_INx

DR_OUTx

S0490-02

OUT

TAS5721

SLOS739A – JULY 2012 – REVISED MARCH 2016

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Figure 65. Headphone/Line Driver with Analog Input

DR_SD pin can be used to turn ON or OFF the headphone amplifier and line driver.

Speaker channels are independent of headphone and line driver in this mode.

9.3.13.2 Using Line Driver Amplifier in TAS5721

Single-supply headphone and line driver amplifiers typically require dc-blocking capacitors. The top drawing in

Figure 66 illustrates the conventional line driver amplifier connection to the load and output signal.

DC blocking capacitors for headphone amps are often large in value, and a mute circuit is needed during power

up to minimize click and pop for both headphone and line driver. The output capacitors and mute circuits

consume PCB area and increase cost of assembly, and can reduce the fidelity of the audio output signal.

Figure 66. Conventional and DirectPath HP and Line Driver

The DirectPath amplifier architecture operates from a single supply but makes use of an internal charge pump to

provide a negative voltage rail.

Combining the user provided positive rail and the negative rail generated by the IC, the device operates in what

is effectively a split supply mode.

TAS5721 Datasheet(PDF) 34 Page - Texas Instruments

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