The DM4120A is an ultra-high-speed, 4-to-1 multiplexer that provides high performance and is easy to use for implementing static or dynamic two-to-one multiplexing. Its wide operating frequency range makes it useful in many situations for the interfacing of low-speed devices to high-speed devices. Both static full-rate switch and dynamic 4:1 multiplexer operating modes are supported. The DM4120A is fabricated using 1-µm HBT GaAs technology and it has been designed using an ECL topology to ensure high-speed operation. Both data inputs (A, B,C,D) and control signal (S1,S2) are DC coupled with internal 50-ohm resistors to avoid the need for external impedance matching terminations. The DM4120A uses SCFL input levels (VIH: 0.0 V, VIL: -0.9 V), and is designed to allow either single-ended or differential data input. AC coupling through an external capacitor is also possible. The output of the DM4120A is DC coupled with 900-mVpp single- ended amplitude. An on-chip, high-performance output buffer provides an excellent eye diagram up to 12.5 Gb/s RZ output..

• Output data rate range: DC to 12.5 Gb/s
• 900 mVpp typical single-ended output
• Single-ended input sensitivity: >300 mV
• 1.2 ps jitter RMS
• Output rise time (20% - 80%): <28 ps
• Output fall time (20% - 80%): <28 ps
• Maximum clock frequency as clock divider: 14 GHz
• Full SCFL input level compatibility
• 50 ohm matched AC/DC coupled input and outputs differential or single-ended
• I/O Up to 12.5 Gb/s Output NRZ static switch, or 4:1 multiplexer
• Power consumption: 0.9 W

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Application Notes