CM6620A

USB 2.0 High-Speed True HD Audio Processor

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Copyright © C-Media Electronics Inc.

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1. Description and Overview

CM6620A is a USB2.0 high-speed audio processor that can support the latest USB Audio Device Class

Definition V2.0 and 7.1-channel true high-definition audio and Line-In/Mic-In (all up to 192KHz/24bit).

CM6620A solution integrates CM9882A as the default codec to provide high-fidelity 106dB SNR (48KHz@24bit)

and ~-95dB THD+N (@1KHz) line output. It could also support 192KHz/24bit S/PDIF transmitter and receiver

and also a USB2.0 MIDI I/O device for music creation applications. CM6620A has an embedded 8051

compatible microprocessor that can provide the best flexibility and functionality with the external

upgradable 32KB NOR Flash ROM codes. With Cmedia versatile software technologies, CM6620A is a powerful

audio core for high-value USB2.0 audio applications.

2. Features

USB Compliance



USB Spec. Rev.2.0 high-speed/full-speed mode compatible



Latest USB Audio Device Class Definition Release 2.0/1.0 compatible (UAC2.0)



USB Human Interface Device (HID) Class Definition Release 1.1 compliant



Supports USB suspend/resume/reset functions



Supports control, interrupt, bulk, and isochronous data transfers

Audio Engine

 Output capability (With CMEDIA CM9882A/A HD Audio Codec)



Up to 7.1 channel output



Sample Rate: 44.1K/48K/96K/192KHz (96K/192KHz are available only in USB Audio Class

2.0/High-speed mode)



Bit Resolution: 16/24 bit



Supports S/PDIF output via CM9882A/A codec

 Input capability (With CMEDIA CM9882A/A HD Audio Codec):



2-channel input for Line-In & Mic-In



Supported Sample Rate: 44.1K/48K/96K/192KHz (192KHz are available only in USB Audio Class

2.0/High-speed mode)



Bit Resolution: 16/24 bit



Supports S/PDIF input

 Embedded one USB MIDI I/O engine