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
The power supply voltage and current requirements are listed in the manufacturers data sheet. A 3.3 V ±5% supply is required. Also,
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.
UG364: SiTCXO1-EVB Evaluation Board User's Guide
Functional Description
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