TS4974 datasheet(4/25 Pages) STMICROELECTRONICS

No. de pieza	TS4974

Descripción Electrónicos	1W differential audio power amplifier with up/down digital volume control pins

PDF	25 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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Typical application schematics

TS4974

4/25

Typical application schematics

Figure 1.

Typical application schematics for the TS4974

Table 3.

External component descriptions

Components

Functional description

Rpu1, Rpu2

Rpd1, Rpd2

Pair of pull-up (Rpu1, Rpu2) or pull down (Rpd1, Rpd2) resistors that are

connected to the digital volume control pins

UP/DVC and DOWN/DVC.

See Section 4.9: Volume setting on page 20.

CIN

Input coupling capacitors that block the DC voltage at the amplifier input

terminal. They form together with the amplifier’s differential input impedance

ZIN a first order high pass filter with a -3dB cut-off frequency

(fcut-off = 1 / (2 x π x ZIN x CIN)).

See Section 4.2: Low frequency response on page 16.

Supply bypass capacitor that provides power supply filtering.

See Section 4.4: Decoupling of the circuit on page 19.

Bypass pin capacitor that provides half supply filtering.

See Section 4.4: Decoupling of the circuit on page 19.

Cin1

330nF

Cin2

330nF

Vin-

Vin+

1µF

Volume DOWN

Volume UP

VCC

1µF

STBY control

Speaker

8 Ohms

470k

Rpd1

470k

Rpd1

470k

Rpu1

470k

Rpu2

VCC

DIGITAL VOLUME

CONTROL

BIAS

STBY

Vin-

Vin+

BYP ASS

STBY

Vout-

Vout+

TS4974 DFN10

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