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LM4930 Dataheets PDF



Part Number LM4930
Manufacturers National Semiconductor
Logo National Semiconductor
Description Audio Subsystem
Datasheet LM4930 DatasheetLM4930 Datasheet (PDF)

LM4930 Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers July 2003 LM4930 Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers General 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 portabl.

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LM4930 Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers July 2003 LM4930 Audio Subsystem with Stereo Headphone & Mono Speaker Amplifiers General 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 25mWRMS to a 32Ω single-ended stereo load with less than 0.5% distortion (THD+N) when AVDD = 3V. The mono speaker amplifier delivers up to 300mW into an 8Ω load with less than 2% distortion when AVDD = 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. Key Specifications j PH/P j PLS OUT at AVDD = 3.0V, 32Ω 25mW (typ) 300mW (typ) 2.6V to 4.5V 2.6V to 5.5V 2µA (typ) 50dB (typ) 0.5% THD+N OUT at AVDD = 3.0V, 8Ω 2% THD+N j Supply voltage range DVDD (Note 8) AVDD (Note 8) j Total shutdown current j PSRR at 217Hz, AVDD = 3V Features 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 300mW mono 8Ω amplifier (at AVDD = 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 n Digital sidetone generation with adjustable attenuation n Gain controllable headphone amp, mono BTL amp, mic preamp n Available in the 36 bump micro SMD package n n n n n n n n n Applications n Mobile Phones n Mobile/low power audio appliances n PDAs Boomer ® is a registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation DS200720 www.national.com LM4930 Typical Application 20072003 FIGURE 1. Typical I2S + Voice codec application circuit for mobile phones www.national.com 2 LM4930 Connection Diagrams 36-Bump micro SMD micro SMD Marking 20072056 Top View X - Date Code T - Die Traceability G - Boomer Family B6 - LM4930ITL 20072002 Top View Order Number LM4930ITL See NS Package Number MKT-TLA36KRA Pin Descriptions A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5 B6 C1 C2 C3 C4 C5 C6 D1 D2 D3 D4 D5 D6 E1 E2 E3 MIC_P MIC_N AVDD_MIC DAC_REF SDA SCL AGND_MIC MIC_BIAS MIC_REF ADDR PCM_SDI PCM_CLK AVDD_HP NC BYPASS PCM_SYNC I2S_DATA DGND_D HP_L HP_R HPSENSE_IN PCM_SDO I2S_CLK DVDD_D AGND_HP LSHPSENSE_OUT Microphone positive differential input Microphone negative differential input Analog Vdd for microphone preamp D/A converter reference voltage Two-wire control interface serial data pin Two-wire control interface serial clock pin Analog ground for microphone preamp Microphone bias supply output (2V) Internal fixed-reference bypass capacitor decoupling pin Control bus address select pin PCM serial data in PCM Serial clock pin Analog Vdd for headphone amplifier No Connect Half-supply bypass capacitor decoupling pin PCM Frame sync pin I2S serial data input Digital ground Headphone amplifier connection (Left) Headphone amplifier connection (Right) Connection for sense pin of headphone jack PCM serial data out I2S serial bit clock Digital Vdd Analog ground for headphone amplifier Loudspeaker amplifier BTL negative out (-) Logic output pin to indicate headphone connection status. Outputs logic high when HPSENSE_IN is high and outputs logic low when HPSENSE_IN is low. See Figure 5 for suggested application circuit LM4930 mode status indicator pin I2S word select Negative feedback source for external crystal MCLK Analog ground for loudspeaker amplifier E4 E5 E6 F1 IRQ I2S_WS XTAL_OUT AGND_LS 3 www.national.com LM4930 Pin Descriptions (Continued) F2 F3 F4 F5 F6 LS+ AVDD_LS DGND_X DVDD_X MCLK/XTAL_IN Loudspeaker amplifier BTL positive out (+) Analog VDD for loudspeaker amplifier Digital ground Digital VDD 12.288MHz or 24.576MHz Master Clock from crystal (via XTAL OUT) or external source SYSTEM CONTROL REGISTERS The LM4930 is controlled with a two-wire serial interface. This interface is used to configure the operating mode, digital interfaces, and delta-sigma modulators. The LM4930 is controlled by writing information into a series of w.


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