Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB) Audio
Playback Recording Peripheral (APRP)
UDA1335H
FEATURES
General
•
USB stereo audio record and playback system with
20 bits analog-to-digital conversion (with 5 to 55 kHz
sample frequency range) and adaptive 20 bits
digital-to-analog conversion (with 5 to 55 kHz sample
frequency range) with integrated filtering
•
USB-compliant audio/HID device
•
Supports 12 Mbits/s ‘full speed’ serial data transmission
•
Fully automatic ‘Plug-and-Play’ operation
•
Supports multiple audio data formats (8, 16 and 24 bits)
•
5.0 and 3.3 V power supply
•
Low power consumption
•
Efficient power management
•
On-chip master clock oscillators, only an external crystal
is required
•
High linearity
•
Wide dynamic range
•
Superior signal-to-noise ratio
•
Low total harmonic distortion
•
Supports headphone and line output
•
Partly programmable USB descriptors and configuration
via the I
2
C-bus.
Sound processing (for digital-to analog conversion)
•
Separate digital volume control for left and right channel
•
Soft mute
•
Digital bass and treble tone control
•
External Digital Sound Processor (DSP) option possible
via standard I
2
S-bus or Japanese digital I/O format
•
Selectable clipping prevention
•
Selectable Dynamic Bass Boost (DBB)
•
On-chip digital de-emphasis.
Document references
•
“USB Specification”
•
“USB Device Class Definition for Audio Devices”
•
“Device Class Definition for Human Interface Devices
(HID)”
•
“USB HID Usage Table”
•
“USB Common Class Specification”.
GENERAL DESCRIPTION
The UDA1335H is a stereo CMOS codec incorporating
bitstream converters designed for implementation in
USB-compliant audio peripherals and multimedia audio
applications. The UDA1335H is an adaptive asynchronous
sink USB audio device with a continuous sampling
frequency range from 5 to 55 kHz. It contains a USB
interface, an embedded microcontroller, an
Analog-to-Digital Interface (ADIF) and an Asynchronous
Digital-to-Analog Converter (ADAC).
The USB interface is the interface between the USB, the
ADIF, the ADAC and the microcontroller. The USB
interface consists of an analog front-end and a USB
processor. The analog front-end transforms the differential
USB data into a digital data stream. The USB processor
buffers the incoming and outgoing data from the analog
front-end and handles all low-level USB protocols.
The USB processor selects the relevant data from the
universal serial bus, performs an extensive error detection
and separates control information (input and output) and
audio information (input and output). The control
information is made accessible to the microcontroller.
The audio information received from the PC becomes
available at the digital I/O output or is fed directly to the
ADAC. The audio information to be transmitted to the PC
is delivered by the ADIF or by the digital I
2
S-bus interface.
The microcontroller handles the high-level USB protocols,
translates the incoming control requests and manages the
user interface via general purpose pins and an I
2
C-bus.
1998 Aug 28
2
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB) Audio
Playback Recording Peripheral (APRP)
The firmware for the microcontroller must be located in an
external (E)PROM.
The ADAC enables the wide and continuous range of input
sampling frequencies. By means of a Sample Frequency
Generator (SFG), the ADAC is able to reconstruct the
average sample frequency from the incoming audio
samples. The ADAC also performs the sound processing.
The ADAC consists of a FIFO, a unique audio feature
processing DSP, the SFG, digital upsampling filters, a
variable hold register, a Noise Shaper (NS) and a Filter
Stream DAC (FSDAC) with integrated filter and line output
drivers. The audio information is applied to the ADAC via
the USB processor or via the digital I/O input.
The ADIF consists of an Programmable Gain Amplifier
(PGA), an Analog-to-Digital Converter (ADC) and a
Decimator Filter (DF). An Analog Phase Lock Loop (APLL)
or oscillator is used for clocking the ADIF. The clock
frequency for the ADIF can be controlled via the
microcontroller. Several clock frequencies are possible for
sampling the analog input signal at different sampling
rates.
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
NAME
UDA1335H
QFP64
DESCRIPTION
plastic quad flat package; 64 leads (lead length 1.95 mm);
body 14
×
20
×
2.8 mm
UDA1335H
Via the digital I/O-bus, an external DSP can be used for
adding extra sound processing features for the audio
received from the PC.
The UDA1335H supports the digital I/O and the I
2
S-bus
interface, with standard I
2
S-bus data input format and the
LSB justified serial data input format with word lengths of
16, 18 and 20 bits.
The wide dynamic range of the bitstream conversion
technique used in the UDA1335H guarantees a high audio
sound quality.
APPLICATIONS
•
USB monitors
•
USB speakers
•
USB headsets
•
USB telephone/answering machines
•
USB links in consumer audio devices.
VERSION
SOT319-2
1998 Aug 28
3
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB) Audio
Playback Recording Peripheral (APRP)
QUICK REFERENCE DATA
SYMBOL
Supplies
V
DDE
V
DDI
I
DD(tot)
I
DD(tot)(ps)
supply voltage periphery
supply voltage core
total supply current
total supply current in power-saving note 1
mode
4.75
3.0
−
−
5.0
3.3
60
360
PARAMETER
CONDITIONS
MIN.
TYP.
UDA1335H
MAX.
UNIT
5.25
3.6
tbf
−
V
V
mA
µA
Dynamic performance DAC
(THD + N)/S
total harmonic distortion plus
noise-to-signal ratio
f
s
= 44.1 kHz; R
L
= 5 kΩ
f
i
= 1 kHz (0 dB)
f
i
= 1 kHz (−60 dB)
S/N
V
o(FS)(rms)
signal-to-noise ratio at bipolar zero
full-scale output voltage
(RMS value)
−
−
−
−
A-weighted at code 0000H 90
V
DD
= 3.3 V
−
−90
0.0032
−30
3.2
95
0.66
−80
0.01
−20
10
−
−
dB
%
dB
%
dBA
V
Dynamic performance PGA and ADC
(THD + N)/S
total harmonic distortion plus
noise-to-signal ratio
f
s
= 44.1 kHz;
PGA gain = 0 dB
f
i
= 1 kHz; (0 dB);
V
i
= 1.0 V (RMS)
f
i
= 1 kHz (−60 dB)
S/N
signal-to-noise ratio
V
i
= 0.0 V
−
−
−
−
90
General characteristics
f
i(s)
T
amb
Note
1. Exclusive the I
DDE
current which depends on the components connected to the I/O pins.
audio input sample frequency
operating ambient temperature
5
0
−
25
55
70
kHz
°C
−85
0.0056
−30
3.2
95
−80
0.01
−20
10.0
−
dB
%
dB
%
dBA
1998 Aug 28
4
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