'I2S input' related articles 1

  1. 2009/09/01 TFA9812 - BTL stereo Class-D audio amplifier with I2S input
General description
The TFA9812 is a high-efficiency Bridge Tied Load (BTL) stereo Class-D audio amplifier with a digital I2S audio input. It is available in a HVQFN48 package with exposed die paddle. The exposed die paddle technology enhances the thermal and electrical performances of the device.
The TFA9812 features digital sound processing and audio power amplification. It supports I2C control mode and Legacy mode. In Legacy mode I2C involvement is not needed because the key features are controlled by hardware pin connections.
A continuous time output power of 2 ´ 12 W (RL = 8 W, VDDP = 15 V) is supported without an external heat sink. Due to the implementation of a programmable thermal foldback even for high supply voltages, higher ambient temperatures, and/or lower load impedances, the device operates without sound interrupting behavior.
TFA9812 is designed in such a way that it starts up easily (no special power-up sequence required). It features various soft and hard impact protection mechanisms to ensure an application that is both user friendly and robust.
A modulation technique is applied for the TFA9812, which supports common mode choke approach (1 common mode choke only per BTL amplifier stage). This minimizes the number of external components.

*General features
-3.3 V and 8 V to 20 V external power supply
-High efficiency and low power dissipation
-Speaker outputs fully short circuit proof across load, to supply lines and ground
-Pop noise free at power-up/power-down and sample rate switching
-Low power Sleep mode
-Overvoltage and undervoltage protection on the 8 V to 20 V power supply
-Undervoltage protection on the 3.3 V power supply
-Overcurrent protection (no audible interruptions)
-Overdissipation protection
-Thermally protected and programmable thermal foldback
-Clock error protection
-I2C mode control or Legacy mode (i.e. no I2C) control
-Four different I2C addresses supported
-Internal Phase-Locked Loop (PLL) without using external components
-No high system clock required (PLL is able to lock on BCK)
-No external heat sink required
-5 V tolerant digital inputs
-Supports dual coil inductor application
-Easy application and limited external components required
*DSP features
-Digital parametric 10-band equalizer
-Digital volume control per channel
-Selectable +24 dB gain boost
-Analog interface to digital volume control in Legacy mode
-Digital clip level control
-Soft and hard mute
-Thermal foldback threshold temperature control
-Output power limiting control
-Polarity switch
-Four Pulse Width Modulation (PWM) switching frequency settings
*Audio data input interface format support
-Master or slave Master Clock (MCLK), Bit Clock (BCK) and Word Select (WS) signals
-Philips I2S, standard I2S
-Japanese I2S, Most Significant Bit (MSB) justified
-Sony I2S, Least Significant Bit (LSB) justified
-Sample rates from 8 kHz to 192 kHz

*Digital-in Class-D audio amplifier applications
*CRT and flat-panel television sets
*Flat-panel monitors
*Multimedia systems
*Wireless speakers
*Docking stations for MP3 players


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