The HMC856 is a wideband time delay device with a 5-bitdigital control designed for timing compensation or clock skewmanagement applications. The time delay provides nearly100 ps (maximum) of delay range with 3 ps resolution andsupports 28 Gbps data. The monotonic delay is compensatedfor stable operation over both power supply and temperaturevariation.

All differential inputs to the HMC856 are current mode logic(CML) and terminated on chip with 50 Ω to the positive supplyground, GND, and can be ac or dc-coupled. The differential CMLoutputs are source terminated to 50 Ω and can also be ac or dccoupled.Connect outputs directly to a 50 Ω ground terminatedsystem or drive devices with CML logic input. The control lines,B4 to B0, are differential CML inputs terminated with 600 Ω tothe positive rail, which supports lower power control options.The HMC856 features an output level control pin, VR, thatallows loss compensation or signal level optimization. TheHMC856 operates from a single −3.3 V supply and is availablein a 5 mm × 5 mm LCC package.

Applications

• SONET OC-192
• High speed serial logic
• Clock and data recovery
• Broadband test and measurement equipment
• Frequency synthesis
• Matched timing

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.