ASNT1123-KMM View full size
  • High speed broadband 4:1 Multiplexer (MUX)
  • Exhibits low jitter and limited temperature variation over industrial temperature range
  • Ideal for high speed proof-of-concept prototyping
  • Differential CML I/O data and clock buffers
  • Half-rate clock input (DDR mode)
  • Quarter-rate clock output
  • Single +3.3V or -3.3V power supply
  • Power consumption: 1.15W
  • Fabricated in SiGe for high performance, yield, and reliability
  • Custom CQFP 44-pin package

Function Operating Frequency Power, mW Package
Broadband Digital DDR 4:1 Multiplexer DC-64 Gbps 1150 44-pin CQFP


Fig. 1 Functional Block Diagram

The ASNT1123-KMM SiGe IC is a low power and high-speed digital 4 to 1 serializer-multiplexer (MUX) that functions seamlessly over data rates (fbit) ranging from DC to its maximum frequency. It's main function is to multiplex 4 parallel differential CML data signals d0p/d0n, d1p/d1n, d2p/d2n, d3p/d3n running at a bit rate of fbit/4 into a high speed serial bit stream qp/qn running at a bit rate of fbit. Differential or single-ended half-rate clock cep/cen (DDR mode) must be provided by an external source for the part to function properly.


The serialized data words qp/qn and the clock divided-by-4 signal c4op/c4on are transmitted through CML output interfaces. The clock and data outputs are well phase-matched to each other resulting in very little relative skew over the operating temperature range of the device. All I/O stages are back terminated with on-chip 50Ω resistors and may be used in either DC or AC coupling modes. In the first mode, the input signal's common mode voltage should comply with 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 uses a single +3.3V or -3.3V power supply.

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