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5. External Input Clock

The Si53208-EVB supports one HCSL external reference input (CLKIN). No additional termination is necessary for this input. For more
details regarding the input clock’s requirements, see the Si532xx datasheet.

UG337: Si53208-EVB User’s Guide • External Input Clock

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com

Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 26, 2021

Содержание Si53208

Страница 1: ...n externally for either precise voltage control or for measuring PSRR performance Convenient probe pads and isolation resistors permit on board single ended or differential measurements Finally the PCB layout optimizes signal integrity and skew which rounds out the capabilities of this EVB KEY FEATURES Evaluation of Silicon Labs Si53208 External power or USB powered DC coupled differential output ...

Страница 2: ...ut Clock 8 6 LEDs 9 7 Quick Start Board Configuration Check List 10 8 Board Schematic BOM and Layout 11 9 Appendix Typical Waveplots 12 9 1 Differential Clock DIFF_0 Output Differential Waveform 12 9 2 Differential Clock DIFF_0 Crossing Voltage 100MHz Single ended waveform 13 9 3 Differential clock DIFF_0 Crossing Voltage 200MHz Single ended waveform 13 Skyworks Solutions Inc Phone 781 376 3000 Fa...

Страница 3: ...hes as shown in Section 2 Each supply can be sourced either by an on board regulator for nominal values or via an external supply to test the device over a range of voltages e g min max supply testing UG337 Si53208 EVB User s Guide Functional Description Skyworks Solutions Inc Phone 781 376 3000 Fax 781 376 3100 sales skyworksinc com www skyworksinc com 3 Rev 0 1 Skyworks Proprietary Information P...

Страница 4: ...rnal power supply or by a USB B connected to a computer Use the 5V Source Select switch SW3 to change between them See the figure below Position the slide in the up position to select the USB port J13 and in the down position to select the external supply J11 J12 Figure 2 1 2 1 Location of EVB Power and Voltage Switches and Jumpers UG337 Si53208 EVB User s Guide Power Supply Switch Settings Skywor...

Страница 5: ...iven time Multiple closed switches at the same time could lead to part damage Jumper JP4 should be installed if the on board regulator is desired Alternatively an external voltage source can be connected to this individual supply by removing JP4 and connecting the voltage of the supply to pin 2 of the jumper and voltage to GND TP13 Note that this is an excellent way to test the PSRR performance of...

Страница 6: ...OE_7b Enable Enable Disable Enable disable times can be measured by connecting an external pulse generator to the middle pin of the header and GND to the LO pin and sending this signal to trigger a scope By measuring the time differential between the rising falling edge of the trigger and last first output clock edge of the corresponding output the user can determine the disable enable time for th...

Страница 7: ...balun should be added to convert the differential output to single ended To analyze signal integrity instead of phase noise change resistors R37 R44 and R74 R81 from 0 to 953 ohms They are all 402 size Also add 2pF capacitors to C42 C49 and C65 C72 which are all 402 size After implementing this change remember that if you are observing the outputs via the SMA connectors to a 50 ohm input scope the...

Страница 8: ...etails regarding the input clock s requirements see the Si532xx datasheet UG337 Si53208 EVB User s Guide External Input Clock Skyworks Solutions Inc Phone 781 376 3000 Fax 781 376 3100 sales skyworksinc com www skyworksinc com 8 Rev 0 1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26 2021 8 ...

Страница 9: ...rce is present independent of 5V_SELECT SW3 switch setting 5V_USB Blue D3 USB port is present independent of 5V_SELECT SW3 switch setting UG337 Si53208 EVB User s Guide LEDs Skyworks Solutions Inc Phone 781 376 3000 Fax 781 376 3100 sales skyworksinc com www skyworksinc com 9 Rev 0 1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26 2021...

Страница 10: ...asurements change resistors R37 R44 and R74 R81 from 0 to 953 ohms They are all 402 size Also add 2pF capacitors to C42 C49 and C65 C72 These are also all 402 size After implementing this change remember that if you are observing the outputs via the SMA connectors to a 50 ohm input scope the scale should be set to 1 20 5 Configure the jumpers at JP5 and JP6 according to how you plan to test the pa...

Страница 11: ...08 evaluation kit UG337 Si53208 EVB User s Guide Board Schematic BOM and Layout Skyworks Solutions Inc Phone 781 376 3000 Fax 781 376 3100 sales skyworksinc com www skyworksinc com 11 Rev 0 1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26 2021 11 ...

Страница 12: ...nce FET probe was used to measure the single ended waveforms The signals were measured on the test points located next to each output SMA The outputs were set up in the stock configuration of no load capacitor and 0 ohm resistors 9 1 Differential Clock DIFF_0 Output Differential Waveform UG337 Si53208 EVB User s Guide Appendix Typical Waveplots Skyworks Solutions Inc Phone 781 376 3000 Fax 781 376...

Страница 13: ...age 200MHz Single ended waveform UG337 Si53208 EVB User s Guide Appendix Typical Waveplots Skyworks Solutions Inc Phone 781 376 3000 Fax 781 376 3100 sales skyworksinc com www skyworksinc com 13 Rev 0 1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26 2021 13 ...

Страница 14: ...RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE Skyworks products are not intended for use in medical lifesaving or life sustaining applications or other equipment in which the failure of the Skyworks products could lead to personal injury death physical or environmental damage Skyworks customers using or selling Skyworks products for use in such applications do so at the...

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