LM49370_14 Datasheet, PDF (1/90 Pages) Texas Instruments – Audio Power Amplifier Series Audio Sub-System with an Ultra Low EMI, Spread Spectrum, Class D Loudspeaker Amplifier

LM49370
www.ti.com
SNAS356D – FEBRUARY 2007 – REVISED MARCH 2012
LM49370 Boomer® Audio Power Amplifier Series Audio Sub-System with an Ultra Low
EMI, Spread Spectrum, Class D Loudspeaker Amplifier, a Dual-Mode Stereo Headphone
Amplifier, and a Dedicated PCM Interface for Bluetooth Transceivers
Check for Samples: LM49370
FEATURES
1
•2 Spread Spectrum Class D Architecture
Reduces EMI
• Mono Class D 8Ω Amplifier, 490 mW at 3.3V
• OCL or AC-Coupled Headphone Operation
• 33mW Stereo Headphone Amplifier at 3.3V
• 115 mW Earpiece Amplifier at 3.3V
• 18-bit Stereo DAC
• 16-bit Mono ADC
• 8 kHz to 192 kHz Stereo Audio Playback
• 8 kHz to 48 kHz Mono Recording
• Bidirectional I²S Compatible Audio Interface
• Bidirectional PCM Compatible Audio Interface
for Bluetooth Transceivers
• I²S-PCM Bridge with Sample Rate Conversion
• Sigma-Delta PLL for Operation from Any Clock
at Any Sample Rate
• Digital 3D Stereo Enhancement
• FIR Filter Programmability for Simple Tone
Control
• Low Power Clock Network Operation if a 12
MHz or 13 MHz System Clock is Available
• Read/Write I²C or SPI Compatible Control
Interface
• Automatic Headphone & Microphone Detection
• Support for Internal and External Microphones
• Automatic Gain Control for Microphone Input
• Differential Audio I/O for External Cellphone
Module
• Mono Differential Auxiliary Output
• Stereo Auxiliary Inputs
• Differential Microphone Input for Internal
Microphone
• Flexible Audio Routing from Input to Output
• 32 Step Volume Control for Mixers in 1.5 dB
Steps
• 16 Step Volume Control for Microphone in 2
dB Steps
• Programmable Sidetone Attenuation in 3 dB
Steps
• Two Configurable GPIO Ports
• Multi-Function IRQ Output
• Micro-Power Shutdown Mode
• Available in the 4 x 4 mm 49 Bump DSBGA
Package
• Key Specifications
– P_{HP (AC-COUP)} (A_V_DD = 3.3V, 32Ω, 1% THD) 33
mW
– P_{HP (OCL)} (A_V_DD = 3.3V, 32Ω, 1% THD) 31
mW
– P_LS ( LS_V_DD = 5V, 8Ω, 1% THD) 1.2 W
– P_LS (LS_V_DD = 4.2V, 8Ω, 1% THD) 900 mW
– P_LS (LS_V_DD = 3.3V, 8Ω, 1% THD) 490 mW
– Shutdown Current 0.8 µA
– PSRR_LS (217 Hz, LS_V_DD = 3.3V) 70 dB
– SNR_LS (AUX IN to Loudspeaker) 90 dB (typ)
– SNR_DAC (Stereo DAC to AUXOUT) 85 dB
(typ)
– SNR_ADC (Mono ADC from Cell Phone In) 90
dB (typ)
– SNR_HP (Aux In to Headphones) 98 dB (typ)
APPLICATIONS
• Smart Phones
• Mobile Phones and Multimedia Terminals
• PDAs, Internet Appliances and Portable
Gaming
• Portable DVD/CD/AAC/MP3 Players
• Digital Cameras/Camcorders
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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2
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.
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