Document Outline
- FEATURES
- General
- Sound processing
- Document references
- APPLICATIONS
- GENERAL DESCRIPTION
- QUICK REFERENCE DATA
- ORDERING INFORMATION
- BLOCK DIAGRAM
- PINNING
- FUNCTIONAL DESCRIPTION
- The Universal Serial Bus (USB)
- The analog front-end
- The USB processor
- The microcontroller
- The Asynchronous Digital-to-Analog Converter (ADAC)
- USB Digital-to-Analog Converter (DAC) descriptors
- Controlling the USB Digital-to-Analog Converter (DAC)
- Clipping prevention
- De-emphasis
- Start-up and configuration of the UDA1321
- The general purpose pins (GP0 to GP5)
- Filter characteristics
- DSP extension port
- LIMITING VALUES
- THERMAL CHARACTERISTICS
- RECOMMENDED OPERATING CONDITIONS
- DC CHARACTERISTICS
- AC CHARACTERISTICS
- APPLICATION INFORMATION
- USB-DAC UDA1321/N101 (FIRMWARE SW 2.1.1.7)
- APPLICATION DIAGRAM
- PACKAGE OUTLINES
- SOT319-2
- SOT136-1
- SOT232-1
- SOLDERING
- DEFINITIONS
- LIFE SUPPORT APPLICATIONS
- PURCHASE OF PHILIPS I 2 C COMPONENTS
DATA SHEET
Preliminary specification
Supersedes data of 1998 May 12
File under Integrated Circuits, IC01
1998 Oct 06
INTEGRATED CIRCUITS
UDA1321
Universal Serial Bus (USB)
Digital-to-Analog Converter (DAC)
1998 Oct 06
2
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB)
Digital-to-Analog Converter (DAC)
UDA1321
FEATURES
General
Universal Serial Bus (USB) stereo Digital-to-Analog
Converter (DAC) system with adaptive (5 to 55 kHz)
20-bits digital-to-analog conversion and filtering
USB-compliant audio and Human Interface Device
(HID)
Supports 12 Mbits/s full-speed serial data transmission
Supports multiple audio data formats (8, 16 and 24 bits)
Supports headphone and line output
Fully automatic `Plug-and-Play' operation
High linearity
Wide dynamic range
Superior signal-to-noise ratio (typical 95 dB)
Low total harmonic distortion (typical 90 dB)
3.3 V power supply
Efficient power management
Low power consumption
On-chip master clock oscillator, only an external crystal
is required
Partly programmable USB descriptors and configuration
via I
2
C-bus.
Sound processing
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 Common Class Specification"
"USB Device Class Definition for Audio Devices"
"Device Class Definition for Human Interface Devices
(HID)"
"USB HID Usage Table".
APPLICATIONS
USB monitors
USB speakers
USB headsets
USB telephone/answering machines
USB links in consumer audio devices.
GENERAL DESCRIPTION
The UDA1321 is a stereo CMOS digital-to-analog
bitstream converter designed for USB-compliant audio
playback devices and multimedia audio
applications.The UDA1321 is an adaptive asynchronous
sink USB audio device with a continuous sampling
frequency (f
s
) range from 5 to 55 kHz. It contains a USB
interface, an embedded microcontroller and an
Asynchronous Digital-to-Analog Converter (ADAC).
The USB interface is the interface between the USB, 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 to a digital
data stream. The USB processor buffers the input and
output 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
only).
1998 Oct 06
3
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB)
Digital-to-Analog Converter (DAC)
UDA1321
The control information becomes accessible at the
microcontroller. The audio information becomes available
at the digital I/O output or is fed directly to the ADAC.
The microcontroller handles the high-level USB protocols,
translates the incoming control requests and manages the
user interface via General Purpose (GP) pins and an
I
2
C-bus.
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 FIFO registers, a unique audio
feature processing DSP, the SFG, digital up-sampling
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.
An external DSP can be used for adding extra sound
processing features via the digital I/O-bus.
The UDA1321 supports the 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 UDA1321 guarantees a high audio
sound quality.
QUICK REFERENCE DATA
Notes
1. V
DD
is the supply voltage on pins V
DDA
, V
DDE
, V
DDI
and V
DDX
. V
SS
is the ground on pins V
SSA
, V
SSE
, V
SSI
and V
SSX
.
All V
DD
and V
SS
pins must be connected to the same supply or ground respectively.
2. The audio information from the USB interface is fed directly to the ADAC.
3. The power-save mode (power management) is not supported in the UDA1321/N101;
see Chapter "USB-DAC UDA1321/N101 (Firmware sw 2.1.1.7)".
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supplies
V
DD
supply voltage
note 1
3.0
3.3
3.6
V
I
DD(tot)
total supply current
-
50
-
mA
I
DD(ps)
supply current in power-save
mode
note 3
-
18
-
mA
Dynamic performance DAC
total harmonic
distortion-plus-noise to signal
ratio
f
s
= 44.1 kHz; R
L
= 5 k
at input signal of 1 kHz (0 dB)
-
-
90
(2)
-
80
dB
-
0.0032 0.01
%
at input signal of 1 kHz (
-
60 dB)
-
-
30
(2)
-
20
dB
-
3.2
10
%
S/N
bz
signal-to-noise ratio at bipolar
zero
A-weighted at code 0000H
90
95
-
dBA
V
o(FS)(rms)
full-scale output voltage
(RMS value)
V
DD
= 3.3 V
-
0.66
-
V
General characteristics
f
i(sample)
audio sample input frequency
5
-
55
kHz
T
amb
operating ambient temperature
0
25
70
C
THD
N
+
S
-----------------------
1998 Oct 06
4
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB)
Digital-to-Analog Converter (DAC)
UDA1321
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
UDA1321H/N101
QFP64
plastic quad flat package; 64 leads (lead length 1.95 mm);
body 14
20
2.8 mm
SOT319-2
UDA1321T/N101
SO28
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
UDA1321PS/N101
SDIP32
plastic shrink dual in-line package; 32 leads (400 mil)
SOT232-1
1998 Oct 06
5
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB)
Digital-to-Analog Converter (DAC)
UDA1321
BLOCK DIAGRAM
Fig.1 Block diagram.
handbook, full pagewidth
MGM839
ANALOG FRONT-END
D
+
USB-PROCESSOR
FIFO REGISTERS
OSC
TEST
CONTROL
BLOCK
MICRO-
CONTROLLER
LEFT
DAC
RIGHT
DAC
TIMING
fs
fs
64fs
128fs
SAMPLE
FREQUENCY
GENERATOR
UP-SAMPLE FILTERS
VARIABLE HOLD REGISTER
UDA1321H
UDA1321T
UDA1321PS
3rd-ORDER
NOISE SHAPER
REFERENCE
VOLTAGE
AUDIO FEATURE
PROCESSING DSP
DIGITAL I/O
GP4/BCKO
GP2/DO
GP0/BCKI
GP3/WSO
GP1/DI
VSSX
TC
RTCB
SHTCB
XTAL2
XTAL1
VDDX
VOUTL
GP5/WSI
SCL
SDA
EA
PSEN
ALE
P2.0
P2.1
P2.2
P2.3
P2.4
P2.5
P2.6
P2.7
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
VDDE
VSSE
VSSI
VDDI
VDDO
VSSO
VDDA
VSSA
VOUTR
Vref
D
-
PDF 
ZIP