TAS2557 Texas instruments

TAS2557

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TAS2557

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Описание

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.

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 mV_pp 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 V_BAT
- 87% at 700 mW in 8 Ω with 4.2 V V_BAT
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

Audio input type	Digital Input
Architecture	Class-D Boosted, Smart Amp
Speaker channels (max)	Mono
Rating	Catalog
Power stage supply (max) (V)	8.5
Power stage supply (min) (V)	2.7
Load (min) (Ω)	4
Output power (W)	5.7
SNR (dB)	111
THD + N at 1 kHz (%)	0.0035
Iq (typ) (mA)	3.9
Control interface	I2C, SPI
Closed/open loop	Closed
Analog supply (min) (V)	2.9
Analog supply (max) (V)	5.5
Sampling rate (max) (kHz)	96
PSRR (dB)	110
Operating temperature range (°C)	-40 to 85