LM4930 Datasheet, PDF (1/40 Pages) National Semiconductor (TI) – Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers

LM4930
www.ti.com
SNAS212C – JULY 2003 – REVISED MAY 2013
LM4930 Boomer™ Audio Power Amplifier Series Audio Subsystem with Stereo
Headphone & Mono Speaker Amplifiers
Check for Samples: LM4930
FEATURES
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•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 AV_DD = 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
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
25mW_RMS to a 32Ω single-ended stereo load with
less than 0.5% distortion (THD+N) when AV_DD = 3V.
The mono speaker amplifier delivers up to 330mW
into an 8Ω load with less than 1% distortion when
AV_DD = 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.
KEY SPECIFICATIONS
• PLS OUT at AV_DD = 5.0V, 8Ω 1% THD+N 1W
(typ)
• PLS OUT at AV_DD = 3.0V, 8Ω 1% THD+N
330mW (typ)
• PH/P OUT at AV_DD = 3.0V, 32Ω 0.5% THD+N
25mW (typ)
• Supply Voltage Range
– DV_DD(1) 2.6V to 4.5V
– AV_DD(1) 2.6V to 5.5V
• Total Shutdown Current 2μA (typ)
• PSRR at 217Hz, AV_DD = 3V 50dB (typ)
(1) Best operation is achieved by maintaining 3.0V ≤ AV_DD ≤ 5.0
and 3.0V ≤ DV_DD ≤ 3.6V. AV_DD must be equal to or greater
than DV_DD. for proper operation.
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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.
Boomer is a trademark of Texas Instruments Incorporated.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2013, Texas Instruments Incorporated