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SiT92211 Evaluation Board (EVB) HW User Manual
Table of Contents
1
Introduction ......................................................................................................................................................................... 2
2
Features .............................................................................................................................................................................. 2
3
Functional Description ......................................................................................................................................................... 3
3.1. VCC and VCCO Power Supplies ............................................................................................................................... 3
3.2. Clock Inputs ............................................................................................................................................................... 3
3.3. Clock States (Input vs Output States)........................................................................................................................ 4
3.4. Output Driver Type .................................................................................................................................................... 4
3.5. Reference Output ...................................................................................................................................................... 4
4
Power Supply Connections ................................................................................................................................................. 4
5
Setting Input Clock Select and REF Output Enable in the EVK .......................................................................................... 6
6
Input Clock Configuration .................................................................................................................................................... 7
7
Configuring for Single ended AC coupled Input Clock ........................................................................................................ 7
7.1. Driving Clock Inputs with LVCMOS Driver (AC coupled) ........................................................................................... 7
7.2. Driving Clock Inputs with LVCMOS Driver (DC coupled) ........................................................................................... 8
8
Driving Differential LVDS or LVDS Boost (AC coupled) .................................................................................................... 10
8.1. Board Configuration for driving DC Coupled LVDS ................................................................................................. 10
8.2. Board Changes Required for DC Coupled LVDS .................................................................................................... 10
9
Board Configuration Required for Driving DC/AC coupled LVPECL ................................................................................. 11
9.1. DC/AC Coupled LVPECL ........................................................................................................................................ 11
10
Output Configuration ......................................................................................................................................................... 12
11
Schematics of SiT92211 Evaluation Kit ............................................................................................................................. 15
11.1. Schematics Sheet 1............................................................................................................................................... 15
11.2. Schematic Sheet 2 ................................................................................................................................................ 16
11.3. Schematic sheet 3 ................................................................................................................................................. 17
11.4. Schematic sheet 4 ................................................................................................................................................. 18
11.5. Schematic sheet 5 ................................................................................................................................................. 19
11.6. Schematic sheet 6 ................................................................................................................................................. 20
11.7. Schematic sheet 7 ................................................................................................................................................. 21
11.8. Schematic sheet 8 ................................................................................................................................................. 22
11.9. Schematic sheet 9 ................................................................................................................................................. 23
11.10. Schematic sheet 10 ............................................................................................................................................. 24
11.11. Schematic Sheet 11 ............................................................................................................................................ 25
SiT92211EB User Manual | Rev 0.5
Page 1 of 26
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Summary of Contents for SiTime SiT92211
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Page 1: Table Of Contents
SiT92211 Evaluation Board (EVB) HW User Manual Table of Contents Introduction ..................................2 Features ....................................2 Functional Description ................................. 3 3.1. VCC and VCCO Power Supplies ..........................3 3.2. Clock Inputs ................................3 3.3. Clock States (Input vs Output States)........................4 3.4. -
Page 2: Introduction
SiT92211 Evaluation Board (EVB) HW User Manual 1 Introduction The SiT92211 Evaluation Board is designed for evaluating the SiT92211, a 2.1 GHz, 10 differential output and 1 LVCMOS low jitter fan out buffer. Figure 1. SiT92211 EVK Board 2 Features Additive jitter performance of 50 fs RMS. -
Page 3: Functional Description
3 Functional Description The SiT92211 is a 10-output differential clock fan out buffer with low additive jitter that can operate up to 2.1 GHz. It features a 3:1 input multiplexer with an optional crystal oscillator input, two banks of 5 differential outputs with multi-mode buffers (LVPECL, LVDS, HCSL, or Hi-Z), one LVCMOS output, and 3 independent output buffer supplies. -
Page 4: Clock States (Input Vs Output States)
LVCMOS output driver. The VCCOC supply can be 3.3 V+/-5 %, 2.5 V+/-5 %, 1.8 V+/-5 %. The VCC supply is dedicated for the input clock receiver, clock distribution unit and the XO inside SiT92211. This supply is independent of VCCOA, VCCOB, VCCOC. - Page 5 Connect the USB cable from PC/laptop USB port to the USB receptacle of the EVK. User can see the LED’s D4 and D5 glowing after connecting the USB. SiT92211 will power up with VCC=VCCOA=VCCOB=VCCOC = 3.3 V using on board LDO’s.
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Page 6: Setting Input Clock Select And Ref Output Enable In The Evk
SiT92211 Evaluation Board (EVB) HW User Manual 5 Setting Input Clock Select and REF Output Enable in the EVK The jumper setting for controlling the input clock select and output enable are given below. Table 11. Jumper settings to control clock select and output enable... -
Page 7: Input Clock Configuration
SiT92211 Evaluation Board (EVB) HW User Manual 6 Input Clock Configuration The input clock is ac coupled and terminated with differential 100 Ohms. Thus, the EVK is configured for differential input clock as shown in Schematic sheet 9. Figure 3 Input Clock Configuration 7 Configuring for Single ended AC coupled Input Clock Many applications require the buffer to receive single ended input clock. -
Page 8: Driving Clock Inputs With Lvcmos Driver (Dc Coupled)
Case1: Let us look at the case where a LVCMOS driver (of 50 Ohm impedance) drive a 50 Ohm load which is located at the input of SiT92211. Let the supply of LVCMOS driver be 1.8 V. Then the swing of the clock at the chip input is 0.9 Vpp. We to set the reference voltage at the reference node at 0.45 V. - Page 9 SiT92211 Evaluation Board (EVB) HW User Manual Case2: If load is purely capacitive, let the supply of LVCMOS driver be 1.8 V. Then the swing of the clock at the chip input is 1.8 Vpp. We to set the reference voltage at the reference node at 0.9 V. Choose VCC = 1.8 V, R should be in the kilo ohm range.
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Page 10: Driving Differential Lvds Or Lvds Boost (Ac Coupled)
SiT92211 Evaluation Board (EVB) HW User Manual 8 Driving Differential LVDS or LVDS Boost (AC coupled) The input sees a 100 Ohm differential resistance which gives a current path for LVDS or LVDS boost. The 100 Ohm differential signal is followed by AC coupling capacitor of 0.1uF. So no change in board configuration is required. -
Page 11: Board Configuration Required For Driving Dc/Ac Coupled Lvpecl
SiT92211 Evaluation Board (EVB) HW User Manual 9 Board Configuration Required for Driving DC/AC coupled LVPECL 9.1. DC/AC Coupled LVPECL The LVPECL standard requires a DC path for the input clock driver. The 50 Ohm termination at the receiver is biased with VCCO-2 V. -
Page 12: Output Configuration
SiT92211 Evaluation Board (EVB) HW User Manual 10 Output Configuration The bank A output is by default configured for driving LVPECL on the EVK. The bank A output are connected to the SMA output connectors via a differential transmission line and 0 Ohm resistor. Appropriate 50 Ohm DC termination should be given for using LVPECL configuration. - Page 13 SiT92211 Evaluation Board (EVB) HW User Manual Figure 11. Bank B output configuration for LVDS SiT92211EB User Manual | Rev 0.5 Page 13 of 26 www.sitime.com...
- Page 14 SiT92211 Evaluation Board (EVB) HW User Manual EVK Snapshot Figure 12 EVK Snapshot Block 1 has USB port to power up the board or to select jumper for power up using external supply as mentioned in Table Block 2 has jumper settings to configure chip VCC as mentioned in Table 6.
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Page 15: Schematics Of Sit92211 Evaluation Kit
SiT92211 Evaluation Board (EVB) HW User Manual 11 Schematics of SiT92211 Evaluation Kit 11.1. Schematics Sheet 1 Figure 13. VCC regulator SiT92211EB User Manual | Rev 0.5 Page 15 of 26 www.sitime.com... -
Page 16: Schematic Sheet 2
SiT92211 Evaluation Board (EVB) HW User Manual 11.2. Schematic Sheet 2 Figure 14. VCCOA regulator SiT92211EB User Manual | Rev 0.5 Page 16 of 26 www.sitime.com... -
Page 17: Schematic Sheet 3
SiT92211 Evaluation Board (EVB) HW User Manual 11.3. Schematic sheet 3 Figure 15. VCCOB regulator SiT92211EB User Manual | Rev 0.5 Page 17 of 26 www.sitime.com... -
Page 18: Schematic Sheet 4
SiT92211 Evaluation Board (EVB) HW User Manual 11.4. Schematic sheet 4 Figure 16. VCCOC regulator SiT92211EB User Manual | Rev 0.5 Page 18 of 26 www.sitime.com... -
Page 19: Schematic Sheet 5
SiT92211 Evaluation Board (EVB) HW User Manual 11.5. Schematic sheet 5 Figure 17. VCC_AUX regulator SiT92211EB User Manual | Rev 0.5 Page 19 of 26 www.sitime.com... -
Page 20: Schematic Sheet 6
SiT92211 Evaluation Board (EVB) HW User Manual 11.6. Schematic sheet 6 Figure 18. Main supply from USB port SiT92211EB User Manual | Rev 0.5 Page 20 of 26 www.sitime.com... -
Page 21: Schematic Sheet 7
SiT92211 Evaluation Board (EVB) HW User Manual 11.7. Schematic sheet 7 Figure 19. FTDI chip for automated control of GPIO pins SiT92211EB User Manual | Rev 0.5 Page 21 of 26 www.sitime.com... -
Page 22: Schematic Sheet 8
SiT92211 Evaluation Board (EVB) HW User Manual 11.8. Schematic sheet 8 Figure 20. FTDI signal to DUT mapping SiT92211EB User Manual | Rev 0.5 Page 22 of 26 www.sitime.com... -
Page 23: Schematic Sheet 9
SiT92211 Evaluation Board (EVB) HW User Manual 11.9. Schematic sheet 9 Figure 21. Input clock configuration SiT92211EB User Manual | Rev 0.5 Page 23 of 26 www.sitime.com... -
Page 24: Schematic Sheet 10
SiT92211 Evaluation Board (EVB) HW User Manual 11.10.Schematic sheet 10 Figure 22. Output configuration- A Bank is configured as LVPECL/HCSL. B bank is configured as LVDS SiT92211EB User Manual | Rev 0.5 Page 24 of 26 www.sitime.com... -
Page 25: Schematic Sheet 11
SiT92211 Evaluation Board (EVB) HW User Manual 11.11.Schematic Sheet 11 Figure 23. SiT92211 Schematic Connections SiT92211EB User Manual | Rev 0.5 Page 25 of 26 www.sitime.com... - Page 26 © SiTime Corporation February 2024. The information contained herein is subject to change at any time without notice. SiTime assumes no responsibility or liabili ty for any loss, damage or defect of a Product which is caused in whole or in part by (i) use of any circuitry other than circuitry embodied in a SiTime product, (ii) misuse or abuse including static discharge, neglect or accident, (iii) unauthorized modification or repairs which have been soldered or altered during assembly and are not capable of being tested by SiTime under its normal test conditions, or (iv) improper installation, storage, handling, warehousing or transportation, or (v) being subjected to unusual physical, thermal, or electrical stress.
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