ASNT1122-KMC View full size
  • High speed broadband switch for selecting one of four inputs to a single output
  • Exhibits low jitter and limited temperature variation over industrial temperature range
  • Ideal for high speed proof-of-concept prototyping
  • CML compliant single ended input data interfaces
  • Fully differential CML output data interface
  • Digital control signals
  • Adjustable output signal’s duty cycle
  • Single +3.3V or -3.3V power supply
  • Low power consumption of 300mW
  • Fabricated in SiGe for high performance, yield, and reliability
  • Custom CQFP 24-pin package

Function Operating Frequency Power, mW Package
Broadband 1 of 4 Selector / Switch DC-32 Gbps 300 24-pin CQFP


Fig.1 Functional Block Diagram

The temperature stable and broadband ASNT1122-KMC SiGe IC is a high isolation selector switch that is intended for use in high-speed measurement / test equipment. The part routes one of 4 single-ended CML inputs (d0p, d1p, d2p, d3p) to its differential CML output outp/outn while effectively blocking the other data inputs with high isolation. Selection of a specific data input is controlled by two digital control signals sel1 and sel2 in accordance with Table 1 found within the part's dataseet. The duty cycle of the output signal is controlled by an external analog voltage vbias.


The part’s I/Os support CML logic interfaces with on chip 50Ω termination to vcc, and it may be used differentially, AC/DC coupled, single-ended or in any combination. In the first mode, the input signal's common mode voltage should comply with the specifications shown in the electrical characteristics table within the part's datasheet. In the second mode, the input termination provides the required common mode voltage automatically. Differential DC signaling is recommended for optimal performance, and the part operates on a single +3.3or -3.3V power supply.

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