STA529Q

2×100毫瓦的D类放大器，具有模拟或数字输入2.0多声道数字音频处理器与FFX 2 x 100 mW class-D amplifier with analog or digital input 2.0 multichannel digital audio processor with FFX

The STA529 is a digital stereo class-D audio amplifier. It includes an audio DSP, an ST proprietary high-efficiency class-D driver and CMOS power output stage. It is intended for high-efficiency digital-to-power-audio conversion for portable applications. The STA529 also provides output capabilities for FFX™. In conjunction with a power device, the STA529 provides high-quality digital amplification.

The STA529 contains an on-chip volume/gain control.

The PWM amplifier achieves greater than 90% efficiency for longer battery life for portable systems.

The innovative class-D modulation, allows the STA529 to work without external LC filters and without a heatsink.

The STA529 I2CDIS pin disables the audio DSP functions and the I2C interface provides a direct conversion of the input signal into output power. This conversion is done without the microcontroller.

The STA529 is designed for low-power operation with extremely low-current consumption in standby mode. It is available in packages TFBGA48 and VFQFPN52. These are very thin packages 1.2 mm thick ideal for small portable applications.

**Key Features**

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Up to 96 dB dynamic range

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Sample rates from 8 kHz to 192 kHz

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FFX™ class-D driver

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1.55 V to 1.95 V digital power supply

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1.80 V to 3.60 V analog and I/O power supply

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18-bit audio processing and class-D FFX™ modulator

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>90-dB SNR analog-to-digital converter

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Digital volume control:

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+36 dB to -105 dB in 0.5-dB steps

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Software volume update

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16-bit ADC

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Individual channel and master gain/attenuation

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Automatic invalid input detect mute

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2-channel I2 S input/output data interface

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Digitally controlled pop-free operation

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90% efficiency

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Output power for stereo headphones or stereo speakers applications at THD = 10% and VCC = 3.3 V:

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45 mW with 32-Ω headphones

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85 mW with 16-Ω headphones

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720 mW with 8-Ω speakers

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1.1 W with 4-Ω speakers