Description

VIA Lab’s VL631 / VL632 is an USB 2.0 FS Audio Codec for quality USB audio consumer applications. It conforms to the USB 2.0 Specification and supports Full-Speed mode. VL631 / VL632 supports USB Audio Class 1.0, and hence can enable driverless product. Featuring with I2C, and GPIO interfaces, VL631 / VL632 stereo I/O supports most popular digital audio sampling resolutions. VL631 / VL632 has one internal oscillator to generate all necessary clock frequencies for internal clock operation. VL631 / VL632 also integrates the 5V-to-3.3V, 5V-to-2.6V 5V-to-1.8V regulator; together with one internal programmable FLASH, it provides customer with extremely cost-competitive BOM solution.   The programmable High-Pass Filter works for low frequency noise suppression. The parametric EQ with fully programmable coefficients is integrated to optimize audio output characteristics. The digital signal processing technology in VL631 / VL632 allows it to deliver better sound quality and enriched audio features without extra driver/software efforts and installation. The 24-bit high signal-to-noise-ratio audio codec is designed to convert digital signal to enhanced analog sound with maximum clarity for the USB audio applications.

Block Diagram

Key Features

• USB Interface
  - USB 2.0 Full-Speed compliant
  - USB Audio Device Class specification v1.0/2.0/3.0 compliant
  - USB Device Firmware Upgrade v1.1 compliant
  - USB HID volume, mute and GIO support


• Integrated Audio Codec
  - 2-ch 16/24-bit ADC
  - Support 8kHz, 11kHz, 16kHz, 22kHz, 24kHz, 32kHz, 44.1kHz, 48kHz, 88.2kHz and 96kHz sampling rates
  - 2-ch 16/24-bit DAC
  - Support 8kHz, 11kHz, 16kHz, 22kHz, 24kHz, 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, and 192kHz sampling rates
  - ADC SNR 92dB and THD -87dB
  - DAC SNR 99dB and THD -83d
• Powerful Digital Mixing/DSP Features
  - 5-band programmable EQ for both DAC and ADC
  - Independent Dynamic Range Compression for both DAC and ADC
  - HP filter for low frequency noise suppression

• Special Features
  Support Single mode and Combo mode which includes one USB Audio Class Device and one Vendor Defined Class Device.
  Support Detour path in Combo mode for supporting the audio processing in Host Side.
  With Vbus detection and ID pin output for selecting OTG mode.
• Embedded Headphone Amplifier
• Embedded Programmable Flash
• Embedded Oscillator
• I2C Interface
  - Support master mode
  - Support wait-status
  - Up to 400kb/s data transfer rate
• Available in 48-pin QFN package
• Lead(Pb)-Free and RoHS compliant
• VL631 Supports 2 Channel Stereo Playback & 2 Channel Recording