User's Guide
SCAU028 – April 2009
CDCS502 Performance Evaluation Module
This user’s guide explains how to use the CDCS502 Performance EVM. The CDCS502 is soldered on the
PCB for best performance. This document explains the settings in detail. The CDCS502 Performance
EVM is now available.
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2
3
4
5
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Contents
Block Diagram ................................................................................................................
1.1
Features ..............................................................................................................
1.2
Related Documentation ............................................................................................
1.3
Additional Assistance...............................................................................................
About the CDCS502 .........................................................................................................
Quick Start ....................................................................................................................
EVM Hardware ...............................................................................................................
4.1
Hardware Configuration ............................................................................................
Bill of Materials NO SOUCE PROVIDED .................................................................................
Schematics ...................................................................................................................
2
2
2
2
2
3
3
3
4
6
List of Figures
1
2
3
4
5
6
7
8
9
CDCS502 Simplified Block Diagram ...................................................................................... 2
CDCS502 Printed-Circuit Board ........................................................................................... 2
Functional Block Diagram of the CDCS502 .............................................................................. 3
CDCS502 and Crystal ....................................................................................................... 6
Jumpers Configuration ...................................................................................................... 7
Jumpers for Control FS Pin ................................................................................................ 8
Jumpers for Selecting the Output .......................................................................................... 9
Power Supply ............................................................................................................... 10
Output Connectors ......................................................................................................... 11
List of Tables
1
Parts List ...................................................................................................................... 4
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1
Block Diagram
1
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Block Diagram
3.3V Connector
USB
Connector
3.3V
DC/DC
Crystal
3.3V
SSC_0
VDD
3.3V
SSC_1
Output
CDCS502
3.3V
FS
Figure 1. CDCS502 Simplified Block Diagram
1.1
Features
•
•
Easy-to-use evaluation module for fast prototyping and application evaluation of the CDCS502
Option for USB power or external power supply
Figure 2. CDCS502 Printed-Circuit Board
1.2
Related Documentation
CDCS502 Crystal Oscillator / Clock Generator with optional SSC (SCAS868)
1.3
Additional Assistance
For assistance with this device, send an e-mail to clocks_apps@list.ti.com
2
About the CDCS502
The CDCS502 is a spread spectrum capable, fundamental mode crystal oscillator with selectable
frequency multiplication.
The crystal frequency is processed by a PLL, whose output frequency is either equal to the input
frequency or multiplied by a factor of 4.
The PLL is also able to spread the clock signal by ±0%, ±0.5%, ±1% or ±2% centered on the output clock
frequency with a triangular modulation.
2
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Quick Start
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By modifying the clock signal, the device can generate output frequencies between 8MHz and 108MHz
with or without SSC from a fundamental mode crystal.
In x1 Mode with an SSC amount of 0%, the device works as a standard crystal oscillator and does not
make use of the built in PLL.
The CDCS502 operates in 3.3V environment and it is characterized for operation from –40°C to 85°C. The
device is offered in an 8 Pin TSSOP package.
VDD
GND
XIN
XO
x1 or x4
SSC
LV
Cmos
OUT
Xout
SSC_SEL 0
SSC_SEL 1
FS
Control
Logic
Figure 3. Functional Block Diagram of the CDCS502
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Quick Start
The following steps allow the user to get started quickly with the EVM.
1. Connect the EVM with the PC with a USB cable or supply 3.3V using connectors J20 and J21.
2. Select the amount of Spread Spectrum and the frequency multiplication using jumpers J32, J33 and
J25.
3. The desired output is available on J5
4
EVM Hardware
4.1
Hardware Configuration
This section gives an extended description of the board hardware, providing the user with a
comprehensive overview of its configuration. Detailed information regarding onboard jumpers and
solder-bridges are included. The user may change the setup and configure the device according to their
requirements.
4.1.1
Power Supply
Power for the EVM can be supplied fully with a USB power supply or a stabilized external power supply.
The following paragraphs describe how to set the board jumpers for each power supply option.
Note:
4.1.1.1
All EVMs are delivered with USB power supply as default
USB Power Supply
Jumper J19 must be on and jumper J17 must be off. With this configuration the DC/DC converter
generates the 3.3V necessary for the CDCS502 out of the 5V from the USB connector. Data lines from
the USB are not used.
4.1.1.2
External Power Supply
For external power supply jumper J19 must be off. Only with this action an external power supply can be
used.
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4.1.2
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Spread Spectrum Control
Jumpers J32 and J33 set the Spread Spectrum percentage.
J32: SSC_SEL1
J33: SSC_SEL0
4.1.3
Frequency Multiplication Selection
Jumper J25 selects the multiplication factor.
5
Bill of Materials NO SOUCE PROVIDED
Table 1. Parts List
QTY
4
Ref Des
PCB
Footprint
Value
MANU
MANU Part No.
5
C10, C12, C14, C22,
C23, C25, C27, C28,
C30, C39
C0402
10 nF
Panasonic - ECG
ECJ-0EB1E103K
18
C12, C14,
C38, C40,
C43, C44,
C48, C49,
C0402
10 nF
Panasonic - ECG
ECJ-0EB1E103K
2
C21, C29
C0402
1 µF
Panasonic - ECG
ECJ-0EB1A105M
1
C24
1210rf_wv
_12d
10 µF
AVX Corporation
1210YD106KAT2A
1
C26
1210rf_wv
_12d
10 µF
AVX Corporation
1210YD106KAT2A
2
C31, C32
C0402
CAP NP
Panasonic - ECG
ECJ-0EB1E103K
1
D1
1210rf_wv
_12d
CCL-CRS10/SM
Lumex
CCL-CRS10/SM
1
D2
1210rf_wv
_12d
CCL-CRS10/SM
Lumex
CCL-CRS10/SM
1
J5
sma
SMA/PLUG
Johnson Comp
142-0701-851
1
J7
sma
SMA/PLUG
Johnson Comp
142-0701-852
Not Mounted
1
J9
sma
SMA/PLUG
Johnson Comp
142-0701-853
Not Mounted
1
J10
sma
SMA/PLUG
Johnson Comp
142-0701-854
Not Mounted
1
J11
sma
SMA/PLUG
Johnson Comp
142-0701-855
Not Mounted
1
J16
usb_conn
CONN USB TYP B FEM
Millmax
ED90003-ND
1
J17
jumper2
HEADER 2
AMP
Novo Shunt
1
J19
jumper2
HEADER 2
AMP
Novo Shunt
1
J20
Banana
Banana_Plug
845R
SPC Technologies
1
J21
Banana
Banana_Plug
845B
SPC Technologies
9
J22, J23, J24, J26, J27,
J28, J29, J30, J31,
HEADER_
3
HEADER 3
AMP
Novo Shunt
3
J25, J32, J33,
HEADER_
3
HEADER 3
AMP
Novo Shunt
1
Q1
sot23a
MMBT2369A
Fairchild
Semiconductor
MMBT2369A
Not Mounted
7
R4, R10, R14, R19,
R22, R27, R52,
R0402
100 Ω
Panasonic - ECG
ERJ-2GEJ101X
Not Mounted
5
R8, R57, R102, R108,
R121,
R0402
0
Panasonic - ECG
ERJ-2GE0R00X
54
R17, R25, R56, R59,
R60, R70, R86, R90,
R95, R96, R97, R98,
R99, R100, R101,
R103, R104, R105,
R106, R107, R110,
R112, R113, R115,
R117, R119, R122,
R62, R63, R66, R69,
R71, R72, R73, R74,
R75, R76, R77, R78,
R79, R80, R81, R82,
R83, R84, R85, R87,
R88, R89, R91, R92,
R123, R124, R125,
R0402
0
Panasonic - ECG
ERJ-2GE0R00X
1
R51
R0402
33 kΩ
Panasonic - ECG
ERJ-2GEJ333X
C23, C25,
C41, C42,
C46, C47,
C50
CDCS502 Performance Evaluation Module
Implementation
Not Mounted
Not Mounted
Not Mounted
Not Mounted
Not Mounted
Not Mounted
Not Mounted
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Table 1. Parts List (continued)
QTY
Ref Des
PCB
Footprint
Value
MANU
MANU Part No.
Implementation
1
R53
R0402
1 kΩ
Panasonic - ECG
ERJ-2GEJ013X
Not Mounted
1
R54
R0402
250 Ω
Panasonic - ECG
ERJ-2GEJ251X
1
R55
R0402
430 Ω
Panasonic - ECG
ERJ-2GEJ431X
Not Mounted
1
U2
SO-0081_27004_0
TPS77518
TPS77518
Texas Instruments
Not Mounted
1
U3
SO-0081_27004_0
TPS77533
TPS77533
Texas Instruments
1
U4
tssop14
CDCS502
CDCS502
Texas Instruments
1
X1
SMD-49
Crystal
KDS
1AJ27000EEC
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Schematics
6
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Schematics
The CDCS502 EVM schematic is appended to this page.
Figure 4. CDCS502 and Crystal
6
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Schematics
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Figure 5. Jumpers Configuration
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Schematics
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Figure 6. Jumpers for Control FS Pin
8
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Schematics
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Figure 7. Jumpers for Selecting the Output
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Schematics
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Figure 8. Power Supply
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Schematics
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Figure 9. Output Connectors
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