SYNCHRONIZED_MAX038_FUNCTION_GENERATORS

Published:2009/7/13 21:24:00 Author:May | From:SeekIC

The MAX038's internal phase detector is intended primarily for use in phase-locked-loop (PLL) configurations. In (a), for example, the phase detector in IC2 enables that device to synchronize its operation with that of IC1. You connect the applied reference signal to IC2's TTL/CMOS-compatible phase-detector input (PDI) and connect the phase-detector output (PDO) to the input (FADJ) of the internal voltage-controlled oscillator. PDO is the output of an exclusive-OR gate-a mixer-which produces rectangular current waveforms at frequencies equal to the sum and difference of the PDI frequency and the MAX038 output frequency. These waveforms are integrated by CPD, to form a triangle-wave voltage output at PDO (b). The 10-Ω/100-pF pair at PDI limits that pin's rate of rise to 10 ns.



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