Sine Wave/Logic Converter Uses Selectable Input Filtering

The LTC6957 from Linear Technology is a dc to 300 MHz dual output buffer/driver/logic translator, excelling at converting sine waves into low phase noise logic level signals. The device converts any dc to 300 MHz reference frequency into dual LVPECL, LVDS or CMOS outputs with low additive jitter of 45 fsRMS (LVPECL) over the 12 kHz to 20 MHz integration bandwidth and less than 200 fsRMS total jitter. The translator also features a proprietary, selectable, input stage bandwidth-limiting feature, which substantially improves the additive phase noise for slow slewing signals by 4-7 dB. Ideal for systems that distribute system clock references for board level synchronization, the device can also be used as a clock driver for ADCs, DACs or DDS ICs. Offered in four output logic signal types, the LTC6957-1 provides two LVPECL outputs, the LTC6957-2 provides two LVDS logic outputs and the LTC6957-3 and LTC6957-4 offer two in-phase CMOS or complementary CMOS outputs, respectively. Each device, available in small RoHS-compliant 12-pin MSOP or 3x3 mm DFN packages, is offered in industrial and automotive grades. The LTC6957 is in production, priced starting at $3.60 each/1,000.

LINEAR TECHNOLOGY CORPORATION