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RC22312A/RC32312A Evaluation Board Manual

R31UH0022EU0100 Rev.1.00

Mar 28, 2023

Page 10

2. Depopulate C2, C3, R398, and R424 to ensure that excess trace is not used.

3. Populate R4 with 50Ω for input termination (ensure signal is >~1.3V amplitude).

4. Place input clock signal at J2 and ensure that the signal is within specification for the XIN pin.

Figure 8. XIN Pin Overdrive Schematic

1.2.3. On-board Crystal Mount

The crystal mounting position can only be used if there is no other signal present on the XIN path (see Figure 9).

In order to setup the evaluation board for crystal input:

1. Depopulate C1, R398, R423, and R424 to ensure there is no excess trace in the XIN pin.

2. Populate C2 and C3 to externally tune the input crystal frequency.

Note: The EVB stray capacitance has been measured to be ~8.24pF.

3. Mount crystal to U3. Remove R400 or R402 if the crystal only has 3 pads.

Figure 9. Crystal Mount Schematic

Figure 1. RC32312A Block Diagram1
Table of Contents2
Functional Description4
Operational Characteristics4
Hardware Setup and Configuration4
Figure 2. Evaluation Board5
Power and USB-C Connections to Computer Host8
Figure 3. USB Power Jumpers8
Overdrive the XIN with an External Signal9
Figure 4. External 5V Board Input9
Figure 5. External 5V Schematic9
Figure 6. J90 Board Input9
Figure 7. VDD Jumper Bypass Schematic9
On-Board Crystal Mount10
Figure 8. XIN Pin Overdrive Schematic10
Figure 9. Crystal Mount Schematic10
On-Board XO Mount11
Figure 10. EVB XO Pads11
Figure 11. XO Path Connection Schematic11
Figure 12. XO Schematic12
Figure 13. XO OE Pin Header Schematic12
Clock Inputs13
Figure 14. Input Clock Termination Schematic13
Figure 15. Input Clock Pull-Up/Down Schematic13
Clock Outputs14
Figure 16. Output Type Options14
Figure 17. LVDS Input Clock Termination14
Figure 18. HCSL Input Clock Termination14
Serial Connection15
On-Board EEPROM15
Figure 19. Communication Setup for I 2 C Mode15
Figure 20. EEPROM in Socket15
Figure 21. EEPROM Pin Description15
Figure 22. EEPROM Schematic16
Figure 23. EEPROM Connection Resistors16
Figure 24. FTDI to I C Communication Jumpers16
GPIO DIP Switch Selectors17
Software Setup and Configuration17
Prepare the Software17
Figure 25. GPIO Schematic and EVB DIP Switches17
Launch the GUI18
Figure 26. Create New Project in Ricbox18
Figure 27. Selecting RC32312A Device GUI in Ricbox18
Figure 28. Ricbox Wizard Navigation19
Figure 29. Ricbox GUI Menu Buttons19
Configure the Evaluation Board20
Figure 30. Connect to the Device in Ricbox20
Figure 31. Connected Button20
Figure 32. Program Button20
Board Design21
Figure 33. RC22312A/RC32312A Evaluation Board (Top)21
Figure 34. RC22312A/RC32312A Evaluation Board (Bottom)22
Bill of Materials (BOM)23
Typical Performance Graphs26
Figure 35. Phase Noise 312.5Mhz Output Synthesizer Mode26
Figure 36. Phase Noise 312.5Mhz Output Jitter Attenuation Mode26
Ordering Information27
Revision History27

Brand	Renesas
Model	RC22312A
Category	Motherboard
Language	English

Renesas RC22312A User Manual

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Renesas RC22312A Specifications

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