ATS-2825

[quad4]

Looks like the NUX guys are using this chip.  Pretty interesting set of features for one low powered chip.   

http://www.actions-semi.com/en/productview.aspx?id=195

System      
    • 104MHz MIPS32 M4K processor Core
    • 180MHz Gogir DSP core
    • Built-in 279.5K RAM for data and program storage
    • Support SD/MMC/eMMC card interface and SPI NorFlash interface
    • Support 26MHz OSC with on-chip PLL
    • Energy saving with dynamic power management, supporting Li-on only
    • USB 2.0 device and host controllers with HOST support
    • A variety of serial controllers supporting I2S, SPDIF TX, SPI, UART, PCM
    • Support Remote Control with the internal IRC for decoding
    • Support 4COM/5COM/6COM Segment LCD, 7pin LED
    • 4 LED drivers with PWM flasher independent of MCU
Audio
    • Build in stereo 24bit input sigma-delta DAC, SNR>95dB, SNR (A-WEIGHTING)>98dB,THD<-85dB
    • DAC supports sample rate 8k/12k/11.025k/16k/22.05k/24k/32k/44.1/48kHz
    • Build in stereo 20mW PA (Power Amplifier) for headphone. PA output supports traditional mode and direct drive mode(for earphone)
    • Support differential audio output for speaker PA
    • Build in stereo 24bit input sigma-delta ADC, SNR>90dB, SNR(A-WEIGHTING)>93dB,THD<-82dB. With multi-bit quantization option,SNR>93dB,SNR(A-WEIGHTING)>96dB
    • ADC supports sample rate 8k/12k/11.025k/16k/22.05k/24k/32k/44.1/48kHz
    • Supports stereo single-ended input analog microphones or mono full difference input microphone
    • Supports Digital microphones and Analog microphones
Bluetooth Controller       • Support Bluetooth V5.0
    • Compatible with Bluetooth V2.1 and V3.0 systems
    • Supports Bluetooth 4.0 Low Energy(BLE)
    • Supports all packet types in basic rate and enhanced data rate
    • Supports SCO/Esco link
    • Supports 4 piconets in a scatternet
    • Supports Secure Simple Pairing
    • Supports Low Power Mode (Sniff/Sniff Sub-rating/Hold/Park)
    • Bluetooth 5.0 Dual Mode support: Simultaneous LE and BR/EDR
    • Supports multiple Low Energy states
    • Fast AGC control to improve receiving dynamic range
    • Supports AFH to dynamically detect channel quality to improve transmission quality
    • Integrated internal Class1, Class2, and Class 3 PA
    • Supports Power Control/Enhanced Power Control
    • Integrated 32K oscillator for power managementC
    • Operating voltage: I/O 3.1V, Core 1.2V
Power       • Supports Li-Ion battery and 5V power supply
    • Integrate Linear battery charger
    • Integrated DC-DC buck converters, which can be switch to LDO mode
    • Linear regulators output VCC, BTVCC, SVCC, RTCVDD from DC5V
    • Linear regulators outputs AVCC from VCC, and VDD from VD15
    • Capacitor-less LDO: UVDD,EFUSE25, AVDD, OSCVDD and BTVDD
    • Internal bandgap generates VREF form SVCC
    • Operating voltage: I/O 3.1V, Core 1.2V
Package       • QFN-68 (8x8mm2)
Application       • Stereo headsets and headphones
    • Portable stereo speakers and speakerphones
    • Bluetooth car audio unit
    • Bluetooth smart LED
    • Soundbar

[Digital Larry]

Wish they had some info online about the instruction set, or tools, or a dev board, or something!