1FEATURES

23• 16-bit Resolution 48kHz Stereo DAC

• 16-bit Resolution 8kHz Voice Codec

• I2S Digital Audio Data Serial Interface

• Two-wire Serial Control Interface

• PCM Voice Audio Data Serial Interface

• 25mW/channel Stereo Headphone Amplifier

• 330mW Mono 8Ω Amplifier (at AVDD = 3.0V)

• 32-step Volume Control for Audio Output

Amplifiers

• No Snubber Networks or Bootstrap Capacitors

are Required by the Headphone or Hands-free

Amplifiers

• Digital Sidetone Generation with Adjustable

Attenuation

• Gain Controllable Headphone Amp, Mono BTL

Amp, Mic Preamp

• Available in the 36–bump DSBGA and 44–lead

WQFN Packages

APPLICATIONS

• Mobile Phones

• Mobile/low Power Audio Appliances

• PDAs

KEY SPECIFICATIONS

• PLS OUT at AVDD = 5.0V, 8Ω 1% THD+N 1W

(typ)

• PLS OUT at AVDD = 3.0V, 8Ω 1% THD+N

330mW (typ)

• PH/P OUT at AVDD = 3.0V, 32Ω 0.5% THD+N

25mW (typ)

• Supply Voltage Range

– DVDD

(1) 2.6V to 4.5V

– AVDD

(1) 2.6V to 5.5V

• Total Shutdown Current 2μA (typ)

• PSRR at 217Hz, AVDD = 3V 50dB (typ)

DESCRIPTION

The LM4930 is an integrated audio subsystem that

supports voice and digital audio functions. The

LM4930 includes a high quality I2S input stereo DAC,

a voice band codec, a stereo headphone amplifier

and a high-power mono speaker amplifier. It is

primarily designed for demanding applications in mobile phones and other portable devices.

The LM4930 features an I2S serial interface for full

range audio, a 16-bit PCM bi-directional serial

interface for the voice band codec and an two-wire

interface for control. The full range music path

features an SNR of 86dB with a 16-bit 48kHz input.

The stereo DAC can also be used while the voice

codec is in use. The headphone amplifier delivers

25mWRMS to a 32Ω single-ended stereo load with

less than 0.5% distortion (THD+N) when AVDD = 3V.

The mono speaker amplifier delivers up to 330mW

into an 8Ω load with less than 1% distortion when

AVDD = 3V.

The LM4930 employs advanced techniques to reduce

power consumption, to reduce controller overhead

and to eliminate click and pop. Boomer audio power

amplifiers were designed specifically to provide high

quality output power with a minimal amount of

external components. It is, therefore, ideally suited for

mobile phone and other low voltage applications

where minimal power consumption is a primary

requirement.