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PDF UAC3552A Data sheet ( Hoja de datos )
| Número de pieza | UAC3552A | |
| Descripción | Universal Serial Bus | |
| Fabricantes | Micronas | |
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( DataSheet : www.DataSheet4U.com )
MICRONAS
PRELIMINARY DATA SHEET
UAC 3552A
Universal Serial Bus
DAC
Edition Nov. 9, 1999
6251-487-1PD
www.DataSheet4U.com
MICRONAS
1 page  
PRELIMINARY DATA SHEET
1.1. Features
– single-chip, USB specification 1.0/1.1 compliant,
stereo audio D/A converter
– 12-Mbit/s USB transceiver
– adaptive isochronous endpoint for USB Audio
– USB-programmable vendor IDs (1024-bit EEPROM
on chip)
– four general purpose input pins and four output pins
(human interface pins)
– customizable I/O functionality by download-software
– supports 16-bit mono/stereo and 24-bit stereo audio
data
– adaptive sample rate converter for 5 to 50 kHz input
sampling rate
– audio baseband control: bass, treble, volume, and
balance, additional analog volume, mute
– bass boost
– automatic gain control (AGC)
– “PerfectSpeaker” digital speaker equalizer
– THD better than 0.01 %, SNR of 96 dB
– integrated low-power stereo headphone amplifier
– on-chip op amps for external analog filter
– analog stereo input (AUX) with source selection and
mixing
– single 5-V power supply
USB
UAC
Fig. 1–2: System application diagram
Micronas
UAC 3552A
Active Stereo Speakers
Headphones
Stereo Equipment
5
5 Page 
PRELIMINARY DATA SHEET
UAC 3552A
2.2.1.4. HID Report Descriptor
The HID report descriptor defines the functionality of
the GPIO Pins. The basic information here are the
usage IDs for the key inputs. These IDs are stored in
the EEPROM and can therefore be modified if the
default configuration does not fit the application. The
UAC 3552A, however, only supports the default func-
tions: volume up/down, mute on/off and BassBoost on/
off. This means, that all nonstandard usage IDs will be
transmitted to the host on request and can be used
with vendor specific software, but only the default IDs
will work together with the operating system.
2.2.2. Audio Processing Software
All audio processing is realized by DSP-software,
apart from volume control which is located in the ana-
log back-end. The audio building blocks split into USB-
independent features, like sample rate conversion and
oversampling filters and blocks which belong to the so
called USB feature unit, defined in the USB Device
Class Definition for Audio Devices. The feature unit
provides basic manipulation of the incoming logical
channels. The UAC 3552A supports two logical chan-
nels (i.e. left & right). Multichannel or surround sys-
tems, however, can also be realized using more than
one UAC 3552A, because phase or delay distortion is
eliminated by locking the audio processing to the USB
frame rate. An overview of the architecture is given in
Fig. 2–3.
2.2.2.1. Sample Rate Converter
The purpose of the sample rate converter is first to
transform the block transferred audio data into a con-
tinuous data stream and second to convert all incom-
ing sample rates to a fixed 50-kHz sample rate. This
technique eliminates input data jitter. Furthermore, all
audio algorithms and the DAC run on a single sample
rate and no parameter switching is required on change
of audio sampling rate. Furthermore, all audio clocks,
such as sampling clock, noise-shaping clock, and
DAC-clock can be derived from a single free-running
12-MHz oscillator. This mechanism allows continuous
input sampling rates from 5 kHz up to 50 kHz.
2.2.2.2. Automatic Gain Control
The Automatic Gain Control (AGC) is one of the build-
ing blocks of the feature unit (USB Device Class Defini-
tion for Audio Devices 1.0, page 39).
Different sound sources fairly often do not have the
same volume level. The Automatic Gain Control solves
this problem by equalizing the volume levels within a
defined range. Below a theshold level the signals are
not affected. The level-adjustment is performed with
time constants in order to avoid short-time adjustments
due to signal peaks.
Sample Rate
Converter
AGC
Feature Unit
Bass/Treble
Bass Boost
Equalizer
Volume/
Balance
Over-
Sampling
Fig. 2–3: Audio processing
Micronas
11
11 Page | ||
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| PDF Descargar | [ Datasheet UAC3552A.PDF ] | |
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