The DM4122AD is an ultra-high-speed, 2-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 2:1 multiplexer operating modes are supported. The DM4122AD 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) and control signal (S1) are DC coupled with internal 50-ohm resistors to avoid the need for external impedance matching terminations. The DM4122AD 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 DM4122AD 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. The DM4122AD combinatorial multiplexer may also be used as an OR- AND gate and the high quality of the output buffer allows it to be used as a 12.5-Gb/s NRZ-to-RZ converter.

Data rate range: 20 NRZ (12.5 RZ) Gb/s

• 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%): <27 ps
• Output fall time (20% - 80%): <24 ps
• Full SCFL input level compatibility
• 50 ohm matched AC/DC coupled input and outputsclock input, and selector input
• Differential or single-ended I/O
• Up to 12.5 Gb/s NRS-to-RZ converter, AND/OR logic implementation, static switch, or multiplexer
• Power consumption: 0.715 W ie

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Application Notes