UAC 3552A
PRELIMINARY DATA SHEET
Universal Serial Bus DAC
1. Introduction
The audio DAC uses Micronas’ proprietary multibit
sigma-delta technique. It features very low sensitivity
to clock jitter, high linearity, and a superior S/N ratio.
The UAC 3552A provides an on-chip headphone/
speaker amplifier. Moreover, mixing additional analog
audio sources to the D/A-converted signal is sup-
ported.
The UAC 3552A is the first member of Micronas’ USB
audio controller family of ICs targeting a wide variety of
audio applications on the USB. The UAC 3552A is a
single-chip, high-precision digital-to-analog audio con-
verter. It includes a high-quality audio sample rate con-
verter and is able to support a wide range of sample
rates, as well as different audio formats.
The IC is designed for all kinds of USB audio applica-
tions, such as USB active speakers, USB headphones,
and USB interfaces to home stereo equipment, etc.
The IC contains a complete USB transceiver that
allows direct connection to the USB. An on-chip
EEPROM allows storing of manufacturer-specific data
or product identification. The EEPROM can be pro-
grammed directly via the USB.
Any existing analog speaker set can easily be
upgraded to USB by just including the UAC 3552A
according to the application circuit on page 27. No
software development is required, because all drivers
are already part of the operating system which sup-
ports USB (e. g. Windows™ 98).
Baseband audio processing is handled by an internal,
powerful DSP. Apart from basic audio features, like
tone and volume control, there is enough processing
power left to realize customer-specific applications.
HID IO
Analog Input
External Loop-through Filter
EEPROM
Volume
OUTL
and
Input
Select
and
D+
USB
Interface
DSP
DAC
Headphone
OUTR
D−
Mixing
Amplifier
ROM
ROM
+5 V GND
Fig. 1–1: Block diagram of the UAC 3552A
4
Micronas
MICRONAS [ MICRONAS ]
