LM49352_14 Datasheet, PDF (1/104 Pages) Texas Instruments – Mono Class D Audio Codec Subsystem with Ground Referenced Headphone Amplifiers Earpiece Driver, and Audio DSP

LM49352
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SNAS467D – MARCH 2009 – REVISED JUNE 2010
LM49352 Boomer™ Mono Class D Audio Codec Subsystem with Ground Referenced
Headphone Amplifiers, Earpiece Driver, and Audio DSP
Check for Samples: LM49352
FEATURES
1
•23 Ultra Efficient, Spread Spectrum Class D
Loudspeaker Amplifier that Operates at 93%
Efficiency
• Low Voltage, True Ground Headphone
Amplifier Operation
• High Performance 103dB SNR Stereo DAC
• High Performance 97dB SNR Stereo ADC
• Up to 96kHz Stereo Audio Playback
• Up to 48kHz Stereo Recording
• Dual Bidirectional I²S or PCM Compatible
Audio Interfaces
• Read/Write I²C Compatible Control Interface
• Flexible Digital Mixer with Sample Rate
Conversion
• Sigma-Delta PLL Clock Network that Supports
System Clocks up to 50MHz Including 13MHz,
19.2MHz, and 26MHz
• Dual stereo 5 band parametric equalizers
• Cascadable DSP Effects that Allow Stereo 10
Band Parametric Equalization
• ALC/Limiter/Compressor on Both DAC and
ADC Paths
• Dedicated Earpiece Speaker Amplifier
• Stereo Auxiliary Inputs and Mono Differential
Input
• Differential Microphone Input with Single-
Ended Option
• Automatic Level Control for Digital Audio
Inputs, Mono Differential Input, Microphone
Input, and Stereo Auxiliary Inputs
• Flexible Audio Routing from Input to Output
• 16 Step Volume Control for Microphone with
2dB Steps
• 32 Step Volume Control for Auxiliary Inputs in
1.5dB Steps
• 4 Step Volume Control for Class D
Loudspeaker Amplifier
• 8 Step Volume Control for Headphone
Amplifier
• Micro-Power Shutdown Mode
• Available in the 3.3 x 3.3 mm 36 bump DSBGA
package
APPLICATIONS
• Smart Phones
• Mobile Phones and VOIP Phones
• Portable GPS Navigator and Portable Gaming
Devices
• Portable DVD/CD/AAC/MP3/MP4 Players
• Digital Cameras/Camcorders
KEY SPECIFICATIONS
• Class D Amplifier Efficiency 93% (Typ)
• P_EP at A_V_DD = 3.3V, 32Ω, 1% THD 58mW (Typ)
• P_HP at HP_V_DD = 2.8V, Stereo 32Ω, 1% THD
65mW/ch (Typ)
• P_LS at LS_V_DD = 5V, 8Ω, 1% THD 1.4W (Typ)
• P_LS at LS_V_DD = 4.2V, 8Ω, 1% THD 970 mW
(Typ)
• P_LS at LS_V_DD = 3.3V, 8Ω, 1% THD 590 mW
(Typ)
• SNR (Stereo DAC at 48kHz) 103 dB (Typ)
• PSRR at 217 Hz, A_V_DD = 3.3V, (HP from AUX)
100dB (Typ)
DESCRIPTION
The LM49352 is a high performance mixed signal
audio subsystem. The LM49352 includes a high
quality stereo DAC, a high quality stereo ADC, a
stereo headphone amplifier, which supports True
Ground operation, a low EMI Class D loudspeaker
amplifier, and an earpiece speaker amplifier. It
combines advanced audio processing, conversion,
mixing, and amplification in the smallest possible
footprint while extending the battery life of feature rich
portable devices.
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.
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 © 2009–2010, Texas Instruments Incorporated