TAS2557器件是一款先进的 D类音频放大器，也是一套功能完备的片上系统 (SoC)。该器件 具有 超低噪声音频 DAC 以及具备扬声器电压和电流感测反馈的 D类功率放大器。片上低延迟 DSP 支持德州仪器 (TI) 的SmartAmp 扬声器保护算法，能够在维持扬声器处于安全状态的同时，最大限度提高扬声器的音量。

【TAS2557】

5.7-W Class-D Mono Audio Amplifier with Class-H Boost and Speaker Sense

Description

The TAS2557 device is a state-of-the-art Class-D audio amplifier which is a full system on a Chip (SoC). The device features a ultra low-noise audio DAC and Class-D power amplifier which incorporates speaker voltage and current sensing feedback. An on-chip, low-latency DSP supports Texas Instruments SmartAmp speaker protection algorithms to maximizes loudness while maintaining safe speaker conditions.

The device can be used easily with any processor with an I2S output and stereo implementations are possible when using two TAS2557 devices. Separate tuning for different speakers is supported allowing customers to add value while maintaining form factor designs. Additionally, the TAS2557 supports separate voice and audio tuning dynamically with ultra-low 15.9 µV ICN regardless of mode of operation making receiver/speaker implementations possible.

A Class-H boost converter generates the Class-D amplifier supply rail. When the audio signal only requires a lower Class-D output power, the boost improves system efficiency by deactivating and connecting VBAT directly to the Class-D amplifier supply. When higher audio output power is required, the multi-level boost quickly activates tracking the signal to provide the additional voltage to the load.

Features

Ultra Low-Noise Mono Boosted Class-D Amplifier

5.7 W at 1% THD+N and 6.9 W at 10% THD+N into 4-Ω Load from 4.2-V Supply

3.8 W at 1% THD+N and 4.5 W at 10% THD+N into 8-Ω Load from 4.2-V Supply

Output Noise for DAC + Class-D (ICN) is 15.9 µV

DAC + Class-D SNR 111 dB at 1%THD+N/8 Ω

THD+N –90 dB at 1 W / 8 Ω with Flat Frequency Response

Post-Filter Feedback (PFFB)

PSRR 110 dB for 200 mVpp ripple at 217 Hz

Input Sample Rates from 8 kHz to 96 kHz

Built-In Speaker Sense

Measures Speaker Current and Voltage

Measures VBAT Voltage, Chip Temperature

Dedicated Real-Time Dual-Core DSP for Speaker Protection

Thermal and Excursion Protection

Detects Speaker Leaks and Damage

High Efficiency Class-H Boost Converter With Multi-Level Tracking

86% at 500 mW in 8 Ω with 3.6 V VBAT

87% at 700 mW in 8 Ω with 4.2 V VBAT

Configurable Automatic Gain Control (AGC)

Limits Battery Current Consumption

Adjustable Class-D Switching Edge-Rate Control

Thermal, Short-Circuit, and Under-Voltage Protection

I2S, Left-Justified, Right-Justified, DSP, and TDM Input and Output Interface,

I2C or SPI Interface for Register Control

Stereo Configuration Using Two TAS2557 Devices

Power Supplies

Boost Input: 2.9 V to 5.5 V

Analog/Digital: 1.65 V to 1.95 V

Digital I/O: 1.62 V to 3.6 V

42-ball, 0.5-mm pitch, DSBGA package

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