Silicon Laboratories SiTCXO1-EVB User Manual
UG364: SiTCXO1-EVB Evaluation Board
User's Guide
The Silicon Labs SiTCXO1-EVB (kit) is used to help evaluate Silicon Labs Jitter Attenuator and
SyncE applications. This board is often used with the Si5348 network synchronizer
clock as the reference input. This board can come with an option of one of two Rakon
TCXOs. U1, option 1 is Rakon's E6518LF 5 mm x 7 mm part (pictured below) and U2,
option2 is Rakon's smaller RPT5032A 3.2 mm x 5 mm part.
Network Synchronization products for Stratum 3/3E, IEEE 1588 and G.8262
EVB FEATURES:
• Dual Footprint capable of two TCXO sizes.
• Power supply filtering
•
Simple single ended output
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UG364: SiTCXO1-EVB Evaluation Board User's Guide
1. Quick Start
1. Connect power 3.3V to J1, and note that start-up current could be on the order of 7-8 mA.
2. Connect SiOCXO1-EB output, J2, to the Si5348 REF clock input using the short SMA cable provided with the EVB kit.
Quick Start
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2. Top Layer View of Board
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Top Layer View of Board
Figure 2.1. Top Layer View of Board
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UG364: SiTCXO1-EVB Evaluation Board User's Guide
Functional Description
3. Functional Description
The SiTCXO1-EB is used in conjunction with Silicon Labs precision timing devices to facilitate characterization. The SiTCXO1-EB was
designed to maximize output termination configurations as well as optional control voltage terminations. Resistors and capacitors are
0603, which makes it simple to remove and add various values. The SiTCXO1-EB bill of materials and PCB layouts are in Section
7. Bill of Materials and Section 6. Schematic.
The SiTCXO1-EB is intended to be a general use board for a 6-pin TCXO with 5.0 mm x 3.2 mm nominal package size, such as the
Rakon P/N RPT5032A. It can also be used with the 6-pin TCXO with 5.0 mm x 7 mm nominal package size, such as the Rakon P/N
E6518LF 12.8 MHz pictured below. See 6. Schematic for example measurements carried out using this TCXO.
Figure 3.1. SiTCXO1-EB Shown Populated with a TCXO
3.1 Power Supply
power
The
note the TCXO initial current can be on the order of 7mA. Power supply filtering has been added to the evaluation board to minimize
spurious response.
3.2 Output Termination
In most applications simple R C termination is used, as seen with R3 and C4 in Figure 6.1 SiTCXO1-EB Schematic on page 7. This
is a resistor to optimize impedance matching and a capacitor to block dc. Modifications can be made as required.
supply voltage and current requirements are listed in the manufacturers data sheet. A 3.3 V ±5% supply is required. Also,
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