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 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
