1

FEATURES

DESCRIPTION

APPLICATIONS

FMTuner

Codec

(MP3)

TPA2050D4

StereoClass-D

plus

DirectPath

Stereo

HeadphoneJack

Left

(SE )

Right

(SE )

Left

(SE )

Right

(SE )

8

Speaker

W

TM

8

Speaker

W

TPA2050D4

1.4 W/CH STEREO CLASS-D AUDIO SUBSYSTEM WITH DirectPath™ HEADPHONE

AMPLIFIER AND 2:1 INPUT MUX

23

• Stereo Class-D Amp:

–

1.4 W into 8

Ω from 5.0 V (10% THD + N)

The TPA2050D4 features a stereo Class-D power

amplifier along with a stereo DirectPath™ headphone

–

1.25 W into 8

Ω from 5.0 V (1% THD + N)

amplifier.

The

TPA2050D4

has

two

stereo

• DirectPath™ Stereo Headphone Amplifier

single-ended (SE) inputs that can be configured as

–

No Output Capacitors Required

one stereo differential input. Both input channels

have a 32-step volume control and the DirectPath

• Gain Select for Headphone Amplifier

headphone amplifier has a 4-level gain control for

• Eight Programmable Maximum Headphone

coarse volume adjustment. All amplifiers have output

Voltage Limits

short-circuit and thermal- overload protection.

• Two Single-Ended or One Differential Stereo

The Class-D amplifiers deliver 1.25 W into 8

Ω at 1%

Input

THD from a 5.0 V supply, and 700 mW from 3.6 V.

• 2:1 Input MUX with Mode Control

The DirectPath headphone amplifier features an

output voltage limiter to reduce the maximum output

• 32-Step Volume Control for Both Input

power to one of seven possible limits. The voltage

Channels

• Independent Shutdown for Headphone and

DirectPath eliminates the need for external DC-

Class-D Amplifiers

blocking output capacitors to the headphones. The

• Short-Circuit and Thermal-Overload Protection

built-in charge pump creates a negative supply

• ±8 kV HBM ESD Protection on Headphone

voltage for the headphone amplifier, allowing a 0-V

Outputs

DC bias at the output.

The DirectPath headphone amplifier gains are 0 dB

• 25-Ball 2,61 mm × 2,61 mm WCSP

(default), –6 dB, –12 dB, and –20 dB, selected

through the I2C interface. This allows the headphone

volume to be different from the loudspeaker volume if

both are used simultaneously.

• Smart Phones / Cellular Phones

• Laptop Computers

The TPA2050D4 has a 2:1 input MUX for audio

source selection. The MUX has mode control which

• Portable Gaming

directs the input-to-output signal path. Mode and gain

• Portable Media Players

interface.

SIMPLIFIED SYSTEM BLOCK DIAGRAM

The voltage supply range for both the Class-D

amplifiers and the headphone charge pump is 2.5 V

to 5.5 V. The Class-D amplifiers use a combined 7

mA and the headphone amplifier uses 10 mA of

typical

quiescent

current.

Total

supply

current

reduces to less than 2

µA.

The TPA2050D4YZK is available in a 25-ball 2.61

mm × 2.61 mm WCSP package.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

DirectPath is a trademark of Texas Instruments.

3

I2C is a trademark of NXP Semiconductors.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.