MK3711

Stresses above the ratings listed below can cause permanent damage to the MK3711. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range.

The MK3711 series of devices include the original, MK3711A, and the new MK3711B and MK3711D. That and MK3711B are drop-in replacements for it and MK3711A devices. Compared to these earlier devices the MK3711D and MK3711B offer a wider operating frequency range and improved power supply noise rejection.

The MK3711 series combines the functions of a VCXO (Voltage Controlled Crystal Oscillator) and PLL (Phase Locked Loop) frequency doubler onto a single chip. Used in conjunction with an external pullable quartz crystal, this monolithic integrated circuit replaces more costly hybrid (canned) VCXO devices. The MK3711 is designed primarily for data and clock recovery applications within end products such as ADSL modems, set-top box receivers, and telecom systems.

The MK3711D exhibits a moderate VCXO gain of 120ppm/V typical, when used with a high quality external pullable quartz crystal. The MK3711B offers a higher VCXO gain of 150ppm/V, similar to the earlier MK3711A. The higher intrinsic VCXO gain of the MK3711C may help compensate for the reduced pullability of a low quality crystal used in some applications. However, higher VCXO gain may also increase clock output phase noise.

The frequency of the on-chip VCXO MK3711 is adjusted by an external control voltage input into pin VIN. Since VIN is a high impedance input, it can be driven directly from an PWM RC integrator circuit. Frequency output increases with VIN voltage input. The usable range of VIN is 0 to 3V.