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DS20006554A 데이터시트(PDF) 79 Page - Microchip Technology |
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DS20006554A 데이터시트(HTML) 79 Page - Microchip Technology |
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79 / 94 page ![]() ZL30260-ZL30263 Data Sheet 79 © 2021 Microchip Technology Inc. DS20006554A Figure 15 - Example External Components for Differential Input Signals Figure 16 - Electrical Characteristics: Differential Clock Outputs Table 10 - Electrical Characteristics: LVDS Clock Outputs VDDOx=VDDH=3.3V±5% or VDDOx=VDDH=2.5V±5% for LVDS operation. Characteristics Symbol Min. Typ. Max. Units Notes Output frequency fOCD 1045 MHz Output common-mode voltage VCM 1.13 1.2 1.37 V Note 1. See Figure 16 Output differential voltage VOD 310 420 530 mV Note 1. See Figure 16 Output differential swing, peak-to-peak VOD,PP 620 840 1060 mVPP Note 1. See Figure 16 Output rise/fall time tR, tF 150 ps 20%-80% Output duty cycle 45 50 55 % Note 1: OCxCR2.OCSF=0001 (LVDS). Output must have 100 DC path between OUTxP and OUTxN to meet these V OD specs. See Figure 17 parts a) and b) for examples where this DC path is a 100 termination resistor at the receiver. Signal Driver 50 50 100 Receiver + - Driver- specified termination network LVDS Example termination networks: R1 R1 R2 R2 LVPECL VDD_driver=3.3V: R1=127 , R2=82 VDD_driver=2.5V: R1=250 , R2=62.5 CML 50 50 VDD_driver VDD_driver VDD_driver 50 50 HCSL DC bias Signal Driver 50 50 Receiver + - Driver- specified DC network Place the 100 termination resistor as close as possible to the device pins. VDD_driver DC bias 100 Consult the signal driver’s data sheet for any required DC network for this arrangement where the termination resistor is on the receiver side of the AC coupling caps. LVPECL drivers often need resistors (typically <200 ) to ground in the DC network. VOCxP VOCxN VOD 1/fOCD VOH VOL VCM VOCxP - VOCxN 0 VOD,PP Microchip Microchip |
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