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LM49370RLX-NOPB Datasheet(PDF) 2 Page - Texas Instruments |
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LM49370RLX-NOPB Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 89 page  AUX_OUT EP_OUT LS_OUT BYPASS HP_VMIDFB HP_VMID HPL_OUT HPR_OUT VREF_FLT INT_BIAS EXT_BIAS MIC_DET EXT_MIC INT_MIC CP_OUT CP_IN PLL_FLT MCLK SCL/SCK SDA/SDI TEST_MODE/CS SPI_MODE I2S_CLK I2S_WS I2S_SDI I2S_SDO PCM_CLK PCM_SYNC PCM_SDI IRQ AUX_R AUX_L POWER MANAGEMENT and CONTROL CLOCKS and 6'_PLL REGISTERS I 2 C/SPI SLAVE AB AB AMP BIAS and DET MIC BIAS and DET BG AB AB AB AUTOMATIC GAIN CONTROL 6' MONO ADC 6' STEREO DAC -34.5 dB to 12 dB MIC -46.5 dB to 12 dB 0 dB to -30 dB 6 dB to 36 dB D PCM_SDO GPIO2 L R GPIO1 FIR FILTER and DIGITAL 3D ALGORITHM A_VDD D_VDD LS_VDD LS_VSS A_VSS D_VSS BB_VDD PLL_VDD LM49370 SNAS356D – FEBRUARY 2007 – REVISED MARCH 2012 www.ti.com DESCRIPTION The LM49370 is an integrated audio subsystem that supports both analog and digital audio functions. The LM49370 includes 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 applications 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 interface. 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 amplifier 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% distortion (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 power consumption, to reduce controller overhead, to speed development 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 components. It is therefore ideally suited for mobile phone and other low voltage applications where minimal power consumption, PCB area and cost are primary requirements. LM49370 Overview Figure 1. Conceptual Schematic 2 Submit Documentation Feedback Copyright © 2007–2012, Texas Instruments Incorporated Product Folder Links: LM49370 |
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