User's Guide
SCAU044 – July 2010
Low-Additive Jitter, Four-LVDS-Outputs Clock Buffer With
Divider EVM
This user's guide describes how to use the CDCLVD1213 evaluation module (EVM) and provides users
with guidelines to build their own systems. The EVM schematics and bill of materials are included.
Figure 1. CDCLVD1213 Evaluation Board
1
Features
•
•
•
•
•
•
•
1.1
Easy-to-use evaluation board to fan out low-phase noise clocks
Easy device setup
Fast configuration
Control pin configurable through jumpers
Board powered at 2.5 V
Differential input clocks
Device and EVM support four LVDS outputs
General Description
The CDCLVD1213 is a high-performance, low-additive jitter clock buffer with divider. The device has one
differential input with internal 140-Ω differential input termination.
SCAU044 – July 2010
Low-Additive Jitter, Four-LVDS-Outputs Clock Buffer With Divider EVM
Copyright © 2010, Texas Instruments Incorporated
1
Getting Started
www.ti.com
The evaluation module (EVM) is designed to demonstrate the electrical performance of the CDCLVD1213.
This fully assembled and factory-tested evaluation board allows complete validation of device
functionalities. For optimum performance, the board is equipped with SMA connectors and well-controlled
50-Ω impedance microstrip transmission lines.
1.2
Signal Path and Control Circuitry
The CDCLVD1213 supports differential input up to 800 MHz. Each device provides up to three LVDS
outputs operating at the input frequency and one output with divide by /1, /2, or /4 frequency.
For more information, see the CDCLVD1213 product data sheet (SCAS897) for details.
2
Getting Started
The EVM has self-explanatory labeling and offers almost the same naming convention as used in the data
sheet. All words appearing in bold italic print in this document are the actual labeling on the EVM.
3
Power Supply Connection
Connect the power supply source to the banana plug labeled VDD2.5V (P3), and connect the ground of
the power supply source to the GND (P2). Place the jumpers between 2 and 3 for JP6 and JP7. Ensure
that LED D2 and D3 are on.
Decoupling capacitors and ferrite beads isolate the EVM power from the device’s power pins. Supply
voltage of a 2.375-V to 2.625-V range can be used in this EVM.
The EVM has an option of providing 3.3 V (P1) and an LDO to convert 3.3 V to 2.5 V. The LDO (U3) is
unpopulated on the EVM.
4
Input Clock Connection
The inputs can be applied through the SMAs, J2 and J3. These inputs are ac coupled to the device inputs
and the common-mode voltage for these inputs after the ac-coupling capacitors are provided externally by
R7 (0 Ω) and R2 and R4.
The device input has an internal 140-Ω resistor. So, for 50-Ω characteristics impedance lines, an external
350 Ω is populated at R9.
5
Output Clock
The CDCLVD1213 generates up to four LVDS outputs. Four outputs are available on the EVM through the
following SMAs: J5 and J6 for QP0; J7 and J8 for QP1; J9 and J10 for QP2; and J11 and J12 for QD.
The LVDS outputs are ac coupled to the respective SMAs. Each output pair has an option of 100-Ω
termination on the board (R23 - R26 – unpopulated).
Table 1. Divider Selection Table for QD Output
6
DIV (JP1)
Divider Ratio
0 (GND)
/1
OPEN
/2
1 (VDD2.5VMISC)
/4
Onboard Oscillator/VCO
This EVM has an option of oscillator or VCO whose output is directly connected to the inputs of the
CDCLVD12313 through R1 and R3. The oscillator (U2) and the associated components are unpopulated
on the EVM.
7
The EVM Board Schematic
Figure 2 through Figure 4 show the printed-circuit board (PCB) schematics.
2
Low-Additive Jitter, Four-LVDS-Outputs Clock Buffer With Divider EVM
Copyright © 2010, Texas Instruments Incorporated
SCAU044 – July 2010
The EVM Board Schematic
www.ti.com
Figure 2. CDCLVD1213EVM – Schematic 1
SCAU044 – July 2010
Low-Additive Jitter, Four-LVDS-Outputs Clock Buffer With Divider EVM
Copyright © 2010, Texas Instruments Incorporated
3
The EVM Board Schematic
www.ti.com
Figure 3. CDCLVD1213EVM – Schematic 2
4
Low-Additive Jitter, Four-LVDS-Outputs Clock Buffer With Divider EVM
Copyright © 2010, Texas Instruments Incorporated
SCAU044 – July 2010
The EVM Board Schematic
www.ti.com
Figure 4. CDCLVD1213EVM – Schematic 3
SCAU044 – July 2010
Low-Additive Jitter, Four-LVDS-Outputs Clock Buffer With Divider EVM
Copyright © 2010, Texas Instruments Incorporated
5
Bill of Materials
8
www.ti.com
Bill of Materials
Qty
Value
Ref Des
Footprint
Part Category
Manufacturer
Manufacturer Part #
12
0.1µF
C2, C3,
C18–C26
0402
Capacitors
Venkel
C0402X7R160-104KNE
1
100pF
C15
0402
Capacitors
Venkel
C0402COG500101JNE
1
18pF
C11
0402
Capacitors
Murata Electronics North America
GRM1555C1H180JZ01
D
1
10µF
C1
0603
Capacitors
Panasonic
ECJ-1VB0J106M
1
1.0µF
C14
0805
Capacitors
Murata Electronics North America
GRM21BR71H105KA1
2L
8
10µF
C4, C13
0805
Capacitors
Murata Electronics North America
GRM21BR71A106KE5
1L
3
1×2
JP6, JP7
0.1"
Connectors
Samtec
HTSW-150-07-G-S
4
1×3
JP1
0.1"
Connectors
Samtec
HTSW-150-07-G-S
3
Banana Plug Metal
P2, P3
4mm
Connectors
Emerson Network Power
Connectivity Solutions
108-0740-001
3
142-0701-231
RF SMA
Connectors
Emerson Network Power
Connectivity Solutions
142-0701-231
10
142-0721-881
J2, J3, J5–J12
RF SMA Edge mount
Connectors
Emerson Network Power
Connectivity Solutions
142-0721-881
2
MBRS240LT3G
D4
SMB
Semiconductor
Products
On Semiconductor
MBRS240LT3G
2
1000
L1
0603
Filters
Murata Electronics North America
BLM18HD102SN1D
1
TPS79601DRBR
U3
8-SON
Integrated Circuits
Texas Instruments
TPS79601DRBR
2
LED - Green
D2, D3
0603
Optoelectronics
Panasonic - Ssg
LNJ312G8LRA
3
0.0 (Zero Ohm)
R8
0402
Resistors
Panasonic - Ecg
ERJ-2GE0R00X
1
1.00K
R11
0402
Resistors
Venkel
CR0402-16W-1001FT
3
10.0K
R19, R20, R21
0402
Resistors
Rohm
MCR01MZPF1002
1
100
R10
0402
Resistors
Venkel
CR0402-16W-1000FT
1
30.1K
R13
0402
Resistors
Venkel
CR0402-16W-3012FT
1
30.9K
R12
0402
Resistors
Panasonic – Ecg
ERJ-2RKF3092X
1
453
R18
0402
Resistors
Panasonic – Ecg
ERJ-2RKF4530X
1
0.0 (Zero Ohm)
R22
0603
Resistors
Panasonic – Ecg
ERJ-3GEY0R00V
2
10.0K
R2, R4
0603
Resistors
Venkel
CR0603-10W-1002FT
2
301
R14, R15
0603
Resistors
Yageo America
RC0603FR-07301RL
1
CDCLVD1213
U1
16-QFN
Integrated Circuits
Texas Instruments
CDCLVD1213
1
571FCB000109D
G
U2
8-SMT
Oscillator
Silicon Labs
571FCB000109DG
10
DNI
R16, R17, R5,
R6, R9, R23–26,
R7
0402
Resistors
2
DNI
C5, C6
0402
Capacitors
1
4-PIN_PROBEDNI
J13–J17
4_17mil_100
Probe
6
Low-Additive Jitter, Four-LVDS-Outputs Clock Buffer With Divider EVM
Copyright © 2010, Texas Instruments Incorporated
SCAU044 – July 2010
Evaluation Board/Kit Important Notice
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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of -0.2 V to Vcc +0.2 V and the output voltage range of -0.2 V to
Vcc +0.2 V .
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load
specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 120° C. The EVM is designed to
operate properly with certain components above 85° C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.
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