UAC 355xB Feb/2003

PRODUCT INFORMATION

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UAC 355xBUniversal Serial Bus (USB) Codec

UAC 355xB is Micronas’ new USB audio IC.It contains a high-performance stereo audioADC/DAC, digital serial interfaces, and anadditional DAC channel for the subwoofersignal.

The UAC 355xB offers a programmable 5-band parametric equalizer for correcting thefrequency response of the applied speakerplus adjustable dynamic low-frequency pro-cessing for the subwoofer channel. All sam-pling rates for USB record and playback arehandled independently.

The codec functionality of the UAC 355xB isextended by additional interfaces, like I2S,allowing all kinds of digital audio processingsystems to be connected to the USB, e. g.Dolby Digital or MP3 decoding chips, suchas DPL 4519G /MAS 3528E, or MAS 35x9F.

General-purpose inputs and outputs con-nect the UAC 355xB to peripheral hardwaresuch as buttons, keyboards, LEDs etc. ViaI2C, more complex peripherals like LCD dis-plays can be controlled.

The UAC 355xB itself can be remote-con-trolled via I2C in non-USB environments.

All in all, the IC is designed as the ideal con-necting matrix between USB, analog anddigital audio input and output, home stereo,compressed audio, and all kinds of humaninterface devices.

Micronas supplies a standard ROM firm-ware based on the USB Composite Class,Audio Class, and HID Class.

Features

◆ Single-chip USB 2.0 full-speed compliant stereo audio ADC and DAC

◆ Adaptive isochronous endpoints for play-back and record USB Audio

◆ Supports 16-bit mono/stereo and 24-bit stereo for playback (D/A converter)

◆ Supports 8-bit mono and 16-bit mono/stereo, for record (A/D converter)

◆ Generic ISO-playback endpoint (Dolby Digital, MP3)

◆ USB programmable device and configuration descriptor

◆ Bus- or self-powered configurations

◆ Remote wake-up

◆ 12 general-purpose I/O pins

◆ I2S input/output interface

◆ independent adaptive sample rates of 6.4 to 48 kHz for USB record and play-back (enhanced full-duplex)

◆ Audio baseband control: bass, treble, loudness, volume, balance, and mute

◆ Dynamic bass management(Micronas Dynamic Bass=MDB)

◆ Digital speaker equalizer (5-band parametric equalizer)

◆ Adjustable digital subwoofer filter

◆ THD better than −85 dB and SNR of typ. 96 dB for D/A converters

◆ THD better than −85 dB and SNR of typ. 92 dB for A/D converters

◆ Integrated stereo headphone amplifier

◆ Subwoofer output with internal split filter

◆ I2C interface (master/slave)

◆ Bootable firmware for µC (UAC 3556B)

◆ Customized firmware extensions possi-ble via plug-ins

◆ On-chip analog filters for out-of-band noise suppression

◆ Packages: PQFN64, PMQFP64, and PMQFP44

PRODUCT INFORMATION

UAC 355xB Feb/2003

All information and data contained in this product information are without any commitment, are not to be consid-ered as an offer for conclusion of a contract, nor shall they be construed as to create any liability. Product ordevelopment sample availability and delivery are exclusively subject to our respective order confirmation form. Bythis publication, Micronas GmbH does not assume responsibility for patent infringements or other rights of thirdparties which may result from its use.

No part of this publication may be reproduced, photo-copied, stored on a retrieval system, or transmittedwithout the express written consent of Micronas GmbH.

Edition Feb. 19, 2003; Order No. 6251-544-2PI

Micronas GmbH ⋅ Hans-Bunte-Strasse 19 ⋅ D-79108 Freiburg (Germany) ⋅ P.O. Box 840 ⋅ D-79008 Freiburg (Germany)Tel. +49-761-517-0 ⋅ Fax +49-761-517-2174 ⋅ E-mail: docservice@micronas.com ⋅ www.micronas.com

Applications

The high-performance audio ADC withdirect microphone and line input makes theUAC 355xB the ideal solution for all kinds ofUSB codec applications. This includes thereplacement of analog sound cards in PCs.Integrated headphone amplifiers allowdirect headphone connection. Therefore,the IC can be employed as a single-chipheadset solution without an extra powersupply (bus-powered).

Versions

Members of the UAC 355xB Family

Version Description

UAC 3556B Universal Serial Bus (USB) codec with standard ROM firmware and boot-loader for 8-kByte firm-ware download

UAC 3554B mask-programmed version

Fig. 1: Typical applications for the UAC 355xB

Fig. 2: Block diagram of the UAC 355xB

D+

D−

OUTL

OUTRDAC

USBInterface DSP

Volumeand HeadphoneAmplifier

HID IO

ROMROM

I2C

ADCProgrammable

Subwoofer

Line-in L

Mic In

Line-in RGain

I2S

Volumeand HeadphoneAmplifier

ROM

RAM

UAC 355xB

Active Stereo Speakers

Headset

Stereo Equipment

USB

Subwoofer

Multichannel Audio(e.g. Dolby Digital)

I2S