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25G Clock and Data Recovery (CDR) Lab Buddy

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Description:

The Discovery Semiconductors Inc. reference-free 1:1 Clock & Data Recovery (CDR) unit, included in the Lab Buddy, conveniently interfaces with the Bit Error Rate (BER) test equipment and provides a Receive, Reshape, & Retime (3R) solution, which is especially important for transmission experiments.

DSC-25G-CDR : 25G Clock and Data Recovery (CDR) Lab Buddy

Fig. 1: DSC-25G-CDR Lab Buddy

This state-of-the-art instrument contains several features to enhance its flexibility. The CDR has been configured for variable data rate operation ranging from 24.8Gb/s to 28.3Gb/s. The CDR can be operated at sub-rates of /2, /4, /8 & /16 over the full rate operating range listed above. Additionally, the CDR can be utilized as a Clock Multiplying Unit (CMU) where a sub-rate clock can be multiplied up to 24.8GHz to 28.3GHz.

Additional features include adjustable input equalization, output data de-emphasis & polarity inversion, adjustable clock & data output amplitude, selectable recovered clock output rate ranging from full rate to /128 in binary steps, independently adjustable vertical & horizontal input data decision thresholds. The CDR output can be configured to generate a PRBS-9 data signal & the input can be used as a PRBS-9 checker. The CDR provides Loss of Signal (LOS) & Loss of Signal Lock (LOSL) indicators. The LOS has an adjustable threshold with adjustable hysteresis.

Salient Features:
  • 24.8 Gb/s to 28.3 Gb/s data rate
  • Operated at sub-rates of /2, /4, /8 & /16 over the full rate operating range
  • Utilized as a Clock Multiplying Unit (CMU)
  • Adjustable input equalization, output data de-emphasis & polarity inversion
  • Loss of Signal (LOS) & Loss of Signal Lock (LOSL) indicators
  • Discovery's proprietary pre-loaded GUI program to operate the CDR's crucial parameters
Applications:
  • 24.8 Gb/s to 28.3 Gb/s NRZ-ASK (PAM2)
  • 100 Gb/s Ethernet
  • Infiniband EDR
  • Fibre Channel
  • CEI 25G/28G

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