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.