ASNT5104-KMC View full size
  • Narrowband (20GHz-32GHz ) tunable clock phase shifter
  • Delay adjustment range of 120ps
  • Employs an on-chip common mode offset compensation feedback circuitry
  • Exhibits low jitter and limited temperature variation over industrial temperature range
  • 1GHzof bandwidth for the phase adjustment tuning port
  • Fully differential CML input interface
  • Fully differential CML output interface with 600mV single-ended swing
  • Single +3.3V or -3.3V power supply
  • Power consumption: 1.4W
  • Fabricated in SiGe for high performance, yield, and reliability
  • Custom CQFP 24-pin package

Function Operating Frequency Power, mW Package
Clock Phase Shifter with DC Offset Compensation and 120ps Delay Variation 20-32 GHz 1400 24-pin CQFP


Fig. 1 Functional Block Diagram

ASNT5104-KMC is a clock variable delay line fabricated in a SiGe technology. The IC shown in Fig. 1 provides an adjustable delay of its differential output signal outp/outn in relation to its input signal inp/inn. The delay is controlled through a wide-band differential tuning port icntp/icntn. The chip incorporates a common-mode offset cancellation circuit that can be disabled through a control port fboff.


The part’s I/Os support the CML logic interface with on chip 50Ω termination to vcc and may be used differentially, AC/DC coupled, single-ended, or in any combination. In the DC-coupling mode, the input signal’s common mode voltage should comply with the specifications shown in the electrical characteristics section within the part's datasheet. In the AC-coupling mode, the input termination provides the required common mode voltage automatically. Due to an extremely low jitter, the part is suitable for use in high-speed measurement/test equipment, and the differential DC signaling mode is recommended for optimal performance.

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