UAC 3553B
Feb/2003
PRODUCT INFORMATION
MU
L
T
IME
D
I
A
UAC 3553B
USB Audio DAC
The UAC 3553B is the DAC version of
Micronas' UAC 3554B/ UAC 3556B USB
codec family.
Apart from the standard audio processing
such as volume, bass, and treble, the
UAC 3553B offers a programmable 5-band
parametric equalizer for correcting the fre-
quency response of the applied speaker.
The DAC functionality of the UAC 3553B is
extended by additional interfaces, like I
2
S I/
O, allowing all kinds of digital audio pro-
cessing systems to be connected to the
USB.
General-purpose inputs and outputs con-
nect the UAC 3553B to peripheral hardware
such as buttons, keyboards, LEDs etc. Via
I
2
C, more complex peripherals like LCD dis-
plays can be controlled; and the
UAC 3553B itself can be remote-controlled
via I
2
C in non-USB environments.
All in all, the IC is designed as the ideal con-
necting matrix between USB, audio
devices, home stereo, and all kinds of
human interface devices. Many functions
are adjustable to the customer's needs.
Moreover, complete plug-in download func-
tionality of the on-chip microcontroller turns
the UAC 3553B into a customer-specific IC.
Micronas provides the standard DAC firm-
ware.
Typical applications are USB speakers and
home stereo equipment.
Features
Single-chip USB 2.0 full-speed compliant
stereo audio D/A converter
Supports 16-bit mono/stereo and 24-bit
stereo for playback
Vendor identification and device configu-
ration stored in external EEPROM
Device can be operated in bus-powered
or self-powered mode
Remote wake-up
8 general-purpose I/O pins with
HID support
Sample rates from 6.4 to 48 kHz for
USB playback
Audio baseband control: bass, treble,
loudness, volume, balance, and mute
Dynamic bass management
(Micronas Dynamic Bass= MDB)
Digital speaker equalizer
(5-band parametric equalizer)
THD better than
-
85 dB and SNR of
typical 96 dB for D/A converters
Integrated high-power stereo headphone
amplifier
I
2
C interface (master/slave)
Customized firmware extensions possi-
ble via plug-ins
On-chip analog filters for out-of-band
noise suppression
44-pin PMQFP package
PRODUCT INFORMATION
UAC 3553B
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 or
development sample availability and delivery are exclusively subject to our respective order confirmation form. By
this publication, Micronas GmbH does not assume responsibility for patent infringements or other rights of third
parties which may result from its use.
No part of this publication may be reproduced, photo-
copied, stored on a retrieval system, or transmitted
without the express written consent of Micronas GmbH.
Edition Feb. 19, 2003; Order No. 6251-595-1PI
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 DAC makes
the UAC 3553B the ideal solution for all
kinds of USB DAC applications. Integrated
headphone amplifiers allow direct head-
phone connection.
Fig. 1: Typical applications for the UAC 3553B
Fig. 2: Block diagram of the UAC 3553B
D+
D
-
OUTL
OUTR
DAC
USB
Controlling
Audio
HID +GPIO
ROM
ROM
I
2
C
ROM
RAM
Volume
+
Headphone
Amplifier
UAC 3553B
Active Stereo Speakers
Headphones
Stereo Equipment
USB
Subwoofer
U
S
B
A
ud
io
Processing
I
2
S
U
S
B
C
on
tro
l
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