User`s guide

Si5365/66-EVB

Si5367/68-EVB

Rev. 0.4 3

4. Si5365/66-EVB and Si5367/68-EVB Quick Start

1. Install the Precision Clock EVB Driver. (This must be installed before the EVB is connected to the PC via the

USB cable.) For details, see Section "7.EVB Software Installation" on page 11.

2. Install the Precision Clock EVB Software. (Assumes that Microsoft .NET Framework 1.1 is already installed.)

3. Connect the two power supplies to the EVB. One is 3.3 V and the other is either 1.8 or 2.5 V. The DUT is

4. Turn on the power supplies.

5. Connect a USB cable from the EVB to the PC where the software was installed.

6. Install USB driver.

7. Launch software by clicking on Start

→Programs→Silicon Laboratories→Precision Clock EVB Software

and selecting one of the programs.

5. Functional Description

The Si5365/66-EVB, Si5367/68-EVB, and software allow for a complete and simple evaluation of the functions,

features, and performance of the Si5365, Si5366, Si5367 and Si5368 Any-Rate Precision Clocks.

5.1. Narrowband versus Wideband Operation

This document describes two evaluation boards: one for the Si5365 and Si5366 and the other for the Si5367 and

Si5368. The former evaluation board is for pin controlled clock parts and the latter is for clock parts that are to be

controlled by an MCU over a serial port. Each of the two boards supports two parts: one that is wideband (the

Si5365 and the Si5367) and the one that is narrowband (the Si5366 and the Si5368). The narrowband parts are

both capable of operating in the wideband mode, so evaluation of the wideband parts can be done by using a

narrowband part in wideband mode. As such, these evaluation boards are only populated with narrowband parts.

To evaluate Si5365 device operation using the Si5365/66-EVB, the RATE[1:0] pins must be set to LL using the

jumper provided. To evaluate Si5367 device operation using the Si536768-EVB, the Precision Clock EVB Software

should be configured for wideband mode. For details, see the Precision Clock EVB Software documentation that

can be found on the enclosed distribution CD.

When operating in wideband mode (Si5365 and Si5367), the reference oscillator should be disabled because it

could add to the phase noise of the output. Removing R28 will disable the reference oscillator. Installing R50 and

C39 will guarantee that the oscillator will not amplify stray signals.

5.2. Block Diagram

Figure 2 is a block diagram of the evaluation board and it is helpful to refer to this diagram. The MCU

communicates to the host PC over a USB connection. The MCU controls and monitors the Si536x through the

CPLD. The CPLD, among other tasks, translates the signals at the MCU voltage level of 3.3 V to the Si536x's

voltage level, which is nominally 2.5 or 1.8 V. The user has access to all of the Si536x's pins using the various

jumper settings as well as through the host PC via the MCU and CPLD.