TS4909 datasheet(1/35 Pages) STMICROELECTRONICS

No. de pieza	TS4909

Descripción Electrónicos	Dual mode low power 150 mW stereo headphone amplifier with capacitor-less and single-ended outputs

PDF	35 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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1 / 35 page

This is information on a product in full production.

January 2013

Doc ID 11972 Rev 9

1/35

35

TS4909

Dual mode low power 150 mW stereo headphone amplifier with

capacitor-less and single-ended outputs

Datasheet

− production data

Features

■ No output coupling capacitors necessary

■ Pop-and-click noise reduction circuitry

■ Operating from V

CC

= 2.2V to 5.5V

■ Standby mode active low

■ Output power:

–

158 mW at 5 V, into 16

Ω with 1% THD+N

max (1 kHz)

–

52 mW at 3.0 V into 16

Ω with 1% THD+N

max (1 kHz)

■ Ultra-low current consumption: 2.0 mA typ. at

3V

■ Ultra-low standby consumption: 10 nA typ.

■ High signal-to-noise ratio: 105 dB typ. at 5 V

■ High crosstalk immunity: 110 dB (F = 1 kHz)

for single-ended outputs

■ PSRR: 72 dB (F = 1 kHz), inputs grounded, for

phantom ground outputs

■ Low t

WU

: 50 ms in PG mode, 100 ms in SE mode

■ Available in lead-free DFN10 3 x 3 mm

Applications

■ Headphone amplifier

■ Mobile phone

■ PDA, portable audio player

Description

The TS4909 is a stereo audio amplifier designed

to drive headphones in portable applications. The

integrated phantom ground is a circuit topology

that eliminates the heavy output coupling

capacitors. This is of primary importance in

portable applications where space constraints are

very high. A single-ended configuration is also

available, offering even lower power consumption

because the phantom ground can be switched off.

Pop-and-click noise during switch-on and switch-

off phases is eliminated by integrated circuitry.

Specially designed for applications requiring low

power supplies, the TS4909 is capable of

delivering 31 mW of continuous average power

into a 32

Ω load with less than 1% THD+N from a

3 V power supply. Featuring an active low

standby mode, the TS4909 reduces the supply

current to only 10 nA (typ.). The TS4909 is unity

gain stable and can be configured by external

gain-setting resistors.

Pin connections (top view)

DFN10 (3 x 3)

1

2

3

4

7

10

9

8

5

6

1

2

3

4

7

10

9

8

5

6

Vin1

Vin2

Stdby

Bypass

SE/PHG

Vdd

Vout1

Vout3

Vout2

Gnd

Vin1

Vin2

BIAS

Gnd

Vout1

Vout2

Vout3

Stdby

SE/PHG

Functional block diagram

Bypass

Vdd

www.st.com

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