VS2000 PRELIMINARY
VS2000
VS2000 - Headtracking Multichannel
USB Audio Headphone IC / USB DAC
Hardware Features
•
Low-power operation
•
Single input voltage: Internal voltage regu-
lation for analog, digital, and I/O power
•
Operates with a single 12 MHz clock
•
Internal PLL clock multiplier
•
USB Full Speed hardware
•
I/O for user interface
•
High-quality on-chip stereo DAC with no
phase error between channels
•
Stereo earphone driver capable of driving a
30
Ω
load
•
Lead-free RoHS-compliant package (Green)
Description
VS2000 is a single-chip multichannel headtrack-
ing USB Audio IC with audio output to head-
phones. VS2000 contains a high-performance low-
power DSP core VS DSP
4
, Full Speed USB port,
general purpose I/O pins, SPI, UART, as well as
a high-quality variable-sample-rate stereo DAC,
and an earphone amplifier, and a common voltage
buffer.
When connected to USB, VS2000 firmware con-
trols an ultrasound transmitter and reads ultrasound
receivers to track the movement of the listener’s
head. VS2000 then performs real-time spatial pro-
cessing to the 5.1 audio channels to position each
sound source correctly depending on the head move-
ment.
An application without headtracking and just with
5.1 audio is also possible.
SPI EEPROM can be used to load code to cus-
tomize the system.
Firmware Features
•
5.1-channel USB Audio Device
•
Human Interface Device (HID) Buttons
–
Volume Decrement
–
Volume Increment
–
Pause
–
Play
–
Rewind
–
Fast Forward
•
Volume controls also work without HID-
aware host
•
Four room effect levels selected with Effect
Level Button
•
Tracking On / Tracking Off / Bypass modes
selected with Power Button
•
Bass and treble controls through USB Au-
dio Feature Unit
•
Advanced controls through separate software
•
SPI EEPROM boot for special applications
•
UART for debugging and special applica-
tions
Version 0.3,
2007-09-05
1
VLSI
Solution
y
VS2000 PRELIMINARY
VS2000
CONTENTS
Contents
1 Disclaimer
4
2
Definitions
4
3
Characteristics & Specifications
3.1
3.2
3.3
3.4
3.5
3.6
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Characteristics of Audio Outputs . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Characteristics of Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
4
4
5
5
5
6
4
Packages and Pin Descriptions
4.1
4.2
Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LQFP-48 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
7
8
5
VS2000 Functional Blocks
5.1
5.2
5.3
Regulator Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
10
11
12
6
Firmware Operation
6.1
6.2
6.3
SPI Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UART Boot/Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Firmware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3.1
USB Audio Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
14
14
15
15
Version 0.3,
2007-09-05
2
VLSI
Solution
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VS2000 PRELIMINARY
6.3.2
VS2000
LIST OF FIGURES
USB Human Interface Device . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
7 Example Application
7.1
Usage Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
19
8 Document Version Changes
8.1
8.2
8.3
Version 0.3, 2007-09-05 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Version 0.2, 2007-08-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Version 0.1, 2007-06-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
20
20
20
9 Contact Information
21
List of Figures
1
2
3
4
5
Pin Configuration, LQFP-48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VS2000 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VS2000 Example Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VS2000 Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VS2000 Example Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
10
17
17
18
Version 0.3,
2007-09-05
3
VLSI
Solution
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VS2000 PRELIMINARY
VS2000
1. DISCLAIMER
1
Disclaimer
This is a
preliminary
datasheet. All properties and figures are subject to change.
2
Definitions
B
Byte, 8 bits.
b
Bit.
Ki
“Kibi” =
2
10
= 1024 (IEC 60027-2).
Mi
“Mebi” =
2
20
= 1048576 (IEC 60027-2).
VS DSP
VLSI Solution’s DSP core.
W
Word. In VS DSP, instruction words are 32-bit and data words are 16-bit wide.
3
3.1
Characteristics & Specifications
Absolute Maximum Ratings
Symbol
VHIGH
Min
-0.3
-0.3
-40
-65
Max
4.0
±50
IOVDD+0.3
1
+85
+150
Unit
V
mA
V
◦
C
◦
C
Parameter
Regulator input voltage
Injected Current on Any Pin
Voltage at Any Digital Input
Operating Temperature
Storage Temperature
1
Must not exceed 3.6 V
3.2
Recommended Operating Conditions
Symbol
AGND DGND
VHIGH
XTALI
CLKI
Min
-40
AVDD+0.3
12
40
Typ
0.0
5.0
12
2
48
50
Max
+85
5.25
48
60
Unit
◦
C
V
V
MHz
MHz
%
Parameter
Ambient Operating Temperature
Analog and Digital Ground
1
Regulator input voltage
3
Input Clock Frequency
Internal Clock Frequency
Master Clock Duty Cycle
1
2
Must be connected together as close the device as possible for latch-up immunity.
To be able to use USB, XTALI must be 12 MHz.
3
4.0 V is required for compliant USB level.
Version 0.3,
2007-09-05
4
VLSI
Solution
y
VS2000 PRELIMINARY
3. CHARACTERISTICS & SPECIFICATIONS
VS2000
3.3
Analog Characteristics of Audio Outputs
Unless otherwise noted:
AVDD
=2.8V,
CVDD
=2.5V,
IOVDD=3.3V, TA=-40..+85
◦
C, XTALI=12 MHz,
Internal Clock Multiplier
4.0×.
DAC tested with full-scale output sinewave, measurement bandwidth 20..20000 Hz,
analog output load: LEFT to CBUF 30Ω, RIGHT to CBUF 30Ω.
Parameter
DAC Resolution
Total Harmonic Distortion
Dynamic Range (DAC unmuted, A-weighted)
S/N Ratio (full scale signal, no load)
Interchannel Isolation (Cross Talk)
Interchannel Isolation (Cross Talk), with GBUF
Interchannel Gain Mismatch
Frequency Response
Full Scale Output Voltage (Peak-to-peak)
Deviation from Linear Phase
Analog Output Load Resistance
Analog Output Load Capacitance
CBUF disconnect current (short-circuit protection)
1
Symbol
THD
IDR
SNR
Min
Typ
18
94
90
75
40
Max
0.1
50
-0.5
-0.05
1.3
AOLR
1.5
30
1
0.5
0.05
1.7
5
100
2
Unit
bits
%
dB
dB
dB
dB
dB
dB
Vpp
◦
200
Ω
pF
mA
AOLR may be lower than
Typical,
but distortion performance may be compromised. Also, there is a maximum
current that the internal regulators can provide.
2
CBUF must have external 10
Ω
+ 47 nF load, LEFT and RIGHT must have external 20
Ω
+ 10 nF load for stability.
3.4
Analog Characteristics of Regulators
Symbol
Min
Typ
Max
50
50
100
Unit
mA
mA
mA
V
mV
mV
mV
%
Parameter
Continuous current, IOVDD
Continuous current, CVDD
Continuous current, AVDD
Dropout voltages, 30 mA
Line regulation, VHIGH
min
. . .
VHIGH
max
Load regulation, 1 mA
. . .
30 mA
Absolute gain setting accuracy
1
Gain step setting accuracy
1
0.3
10
-150
-10
100
+150
+10
Absolute level depends on RCAP voltage
3.5
Power Consumption
Min
Typ
75
Max
Unit
mA
Parameter
Full operation in example application,
V
bus
= 5 V
Version 0.3,
2007-09-05
5
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