Mono Class D And Stereo Audio Sub-System With OCL Headphone Amplifier And National 3D

The LM4947 is an Audio subsystem capable of efficiently delivering 500mW (Class D operation) of continuous average power into a mono 8& bridged-tied load (BTL) with 1% THD+N, 37mW (Class AB operation) power channel of continuous average power into stereo 32& single-ended (SE) loads with 1% THD+N, or an output capacitor-less (OCL) configuration with identical specification as the SE configuration, from a 3.3V power supply.
The LM4947 has six input channels: one pair for a two-channel stereo signal, the second pair for a secondary two-channel stereo input, and the third pair for a differential single-channel mono input. Additionally, the two sets of stereo inputs may be configured as a single stereo differential input (differential left and differential right). The LM4947 features a 32-step digital Volume Control and eight distinct output modes. The digital Volume Control 3D enhancement, and output modes are programmed through a two-wire I 2C compatible Interface that allows flexibility in routing and mixing Audio channels.
The RF suppression circuitry in the LM4947 makes it well-suited for GSM mobile phones and other portable applications in which strong RF signals generated by an Antenna (and long output traces) may couple audibly into the Amplifier
The LM4947 is designed for cellular phones, PDAs, and other portable handheld applications. It delivers high quality output power from a surface-mount package and requires only eight external components in the OCL mode (two additional components in SE mode).
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM4947TL/NOPB Texas Instruments Mono Class D and Stereo Audio Sub-System with OCL Headphone Amplifier and TI 3D 25-DSBGA -40 to 85
LM4947TLX/NOPB Texas Instruments VOLUME CONTROL CIRCUIT
LM4947 's PackagesLM4947 's pdf datasheet
LM4947TL
LM4947TLX




LM4947 Pinout, Pinouts
LM4947 pinout,Pin out
This is one package pinout of LM4947,If you need more pinouts please download LM4947's pdf datasheet.

LM4947 Application circuits
LM4947 circuits
This is one application circuit of LM4947,If you need more circuits,please download LM4947's pdf datasheet.


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