TS4604 datasheet(17/31 Pages) STMICROELECTRONICS

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TS4604

Application information

Doc ID 17913 Rev 1

17/31

Application information

6.1

General description

The TS4604 is a stereo headset driver and a ground-referenced stereo audio line driver. To

save energy, each audio path, line driver or headphone can be independently set to standby

mode.

The headphone delivers up to 100 mW into a 16

Ω load, and the line driver drives up to

2 Vrms into 5k or more. The gain can be set up to 20 dB by changing the values of the

external gain resistors.

The outputs of the headphone and line driver are protected against overloads. Overloads

can occur when the outputs are short-circuited between them or to Gnd or to VCC. There is

also an internal thermal shutdown activated at 150°C (typical) and deactivated at 120°C

(typical).

To remove the bulky output DC blocking capacitor and maximize the output swing of the

amplifier, the TS4604 embeds a low noise internal negative supply. All amplifiers are

supplied between a positive voltage +Vp and a negative voltage -Vn. With this architecture,

the output voltage is centered on 0 V, allowing the swing of the output voltage between the

positive and negative rail, as depicted in Figure 45.

Both the line driver and headset driver use this architecture.

Figure 45.

TS4604 voltage for one channel

Note:

The PVSSHP and PVSSLD voltages are generated internally by the internal negative

supply. To avoid damage to the TS4604, do not connect an external power supply on

the PVSSHP and PVSSLD pins.

0 V

Vreg

Vcc

+Vp

-Vn

+Vp

-Vn

In+

In-

Out

Negative

supply

AM06139

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