LM4930_14 Datasheet, PDF (1/41 Pages) Texas Instruments – Audio Power Amplifier Series Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers

LM4930
www.ti.com
SNAS212B – MAY 2004 – REVISED SEPTEMBER 2004
LM4930 Boomer™ Audio Power Amplifier Series Audio Subsystem with Stereo
Headphone & Mono Speaker Amplifiers
Check for Samples: LM4930
FEATURES
1
•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 micro SMD and
44–lead LLP 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.
P_{LS OUT} at AV_DD = 5.0V, 8Ω
P_{LS OUT} at AV_DD = 3.0V, 8Ω
P_{H/P OUT} at AV_DD = 3.0V, 32Ω
Supply voltage range
Table 1. Key Specifications
1% THD+N
1% THD+N
0.5% THD+N
DV_DD ⁽¹⁾
AV_DD ⁽¹⁾
VALUE
1
330
25
2.6V to 4.5
2.6V to 5.5
UNIT
W (typ)
mW (typ)
mW (typ)
V
V
(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.
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.
Boomer is a trademark of Texas Instruments Incorporated.
2
All other trademarks are the property of their respective owners.
3
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 © 2004, Texas Instruments Incorporated