PDF LM49370 Data sheet ( Hoja de datos )

Número de pieza	LM49370
Descripción	Audio Sub-System
Fabricantes	National Semiconductor
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No Preview Available ! www.DataSheet4U.com February 2007 LM49370 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 1.0 General Description The LM49370 is an integrated audio subsystem that supports both analog and digital audio functions. The LM49370 in- cludes a high quality stereo DAC, a mono ADC, a stereo headphone amplifier, which supports output cap-less (OCL) or AC-coupled (SE) modes of operation, a mono earpiece amplifier, and an ultra-low EMI spread spectrum Class D loudspeaker amplifier. It is designed for demanding applica- tions in mobile phones and other portable devices. The LM49370 features a bi-directional I2S interface and a bi- directional PCM interface for full range audio on either inter- face. The LM49370 utilizes an I2C or SPI compatible interface for control. The stereo DAC path features an SNR of 85 dB with an 18-bit 48 kHz input. In SE mode the headphone am- plifier delivers at least 33 mWRMS to a 32Ω single-ended stereo load with less than 1% distortion (THD+N) when A_VDD = 3.3V. The mono earpiece amplifier delivers at least 115mWRMS to a 32Ω bridged-tied load with less than 1% dis- tortion (THD+N) when A_VDD = 3.3V. The mono speaker amplifier delivers up to 490mW into an 8Ω load with less than 1% distortion when LS_VDD = 3.3V and up to 1.2W when LS_VDD = 5.0V. The LM49370 employs advanced techniques to reduce pow- er consumption, to reduce controller overhead, to speed de- velopment time, 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 com- ponents. It is therefore ideally suited for mobile phone and other low voltage applications where minimal power con- sumption, PCB area and cost are primary requirements. 2.0 Applications ■ Smart phones ■ Mobile Phones and Multimedia Terminals ■ PDAs, Internet Appliances and Portable Gaming ■ Portable DVD/CD/AAC/MP3 Players ■ Digital Cameras/Camcorders 3.0 Key Specifications ■ PHP (AC-COUP) (A_VDD = 3.3V, 32Ω, 1% THD) ■ PHP (OCL) (A_VDD = 3.3V, 32Ω, 1% THD) ■ PLS ( LS_VDD = 5V, 8Ω, 1% THD) ■ PLS (LS_VDD = 4.2V, 8Ω, 1% THD) ■ PLS (LS_VDD = 3.3V, 8Ω, 1% THD) ■ Shutdown Current ■ PSRRLS (217 Hz, LS_VDD = 3.3V) 33 mW 31 mW 1.2 W 900 mW 490 mW 0.8 µA 70 dB ■ SNRLS (AUX IN to Loudspeaker) ■ SNRDAC (Stereo DAC to AUXOUT) ■ SNRADC (Mono ADC from Cell Phone In) ■ SNRHP (Aux In to Headphones) 90 dB (typ) 85 dB (typ) 90 dB (typ) 98 dB (typ) 4.0 Features ■ 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 micro SMDxt package Boomer® is a registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation 201917 www.national.com 1 page 7.0 Connection Diagrams 49 Bump micro SMDxt 49 Bump micro SMDxt Marking 201917p3 Top View (Bump Side Down) Order Number LM49370RL See NS Package Number RLA49UUA Top View 201917q7 XY — Date Code TT — Die Traceability G — Boomer I3 — LM49370RL 5 www.national.com 5 Page LM49370 Symbol Parameter Conditions Typical (Note 6) Limit (Notes 7, 11) Units fPCMCLK PCM CLK Frequency DCI2S_CLK I2S_CLK Duty Cycle fS = 48kHz; 16 bit mode fS = 48kHz; 25 bit mode fS = 8kHz; 16 bit mode fS = 8kHz; 25 bit mode Min Max 0.768 1.2 0.128 0.2 MHz MHz MHz MHz 40 % (min) 60 % (max) DCI2S_WS I2C I2S_WS Duty Cycle 50 % TI2CSET TI2CHOLD SPI I2C Data Setup Time I2C Data Hold Time Refer to Pg. 16 for more details Refer to Pg. 16 for more details 100 ns (min) 300 ns (min) TSPISETENB Enable Setup Time TSPIHOLD-ENB Enable Hold Time TSPISETD Data Setup Time TSPIHOLDD Data Hold Time TSPICL Clock Low Time TSPICH Clock High Time VOLUME CONTROL 100 ns (min) 100 ns (min) 100 ns (min) 100 ns (min) 500 ns (min) 500 ns (min) Minimum Gain w/ AUX_BOOST OFF –46.5 dB VCRAUX AUX Volume Control Range Maximum Gain w/ AUX_BOOST OFF Minimum Gain w/ AUX_BOOST ON 0 –34.5 dB dB Maximum Gain w/ AUX_BOOST ON 12 dB Minimum Gain w/ DAC_BOOST OFF –46.5 dB VCRDAC DAC Volume Control Range Maximum Gain w/ DAC_BOOST OFF Minimum Gain w/ DAC_BOOST ON 0 –34.5 dB dB Maximum Gain w/ DAC_BOOST ON 12 dB VCRCPIN CPIN Volume Control Range Minimum Gain Maximum Gain –34.5 12 dB dB VCRMIC MIC Volume Control Range Minimum Gain Maximum Gain 6 dB 36 dB VCRSIDE SIDETONE Volume Control Range Minimum Gain Maximum Gain –30 dB 0 dB SSAUX AUX VCR Stepsize 1.5 dB SSDAC DAC VCR Stepsize 1.5 dB SSCPIN CPIN VCR Stepsize 1.5 dB SSMIC MIC VCR Stepsize 2 dB SSSIDE SIDETONE VCR Stepsize 3 dB AUDIO PATH GAIN W/ STEREO (bit 6 of 0x00h) ENABLED (AUX_L & AUX_R signals identical and selected onto mixer) Minimum Gain from AUX input, BOOST OFF –34.5 dB Loudspeaker Audio Path Gain Maximum Gain from AUX input, BOOST OFF 12 dB Minimum Gain from CPI input –22.5 dB Maximum Gain from CPI input 24 dB 11 www.national.com 11 Page

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