GS4901B/GS4900B数据手册Semtech中文资料规格书

特性 Features

·Video Clock Synthesis·Pre-programmed for 4 video clock periods (14.32 MHz, 27 MHz, 36 MHz, and 54 MHz)
·Accuracy of free-running clock frequency limited only by crystal reference
·One differential and two single-ended video/graphics clock outputs
·Each clock may be individually delayed for skew control
·Video output clock may be directly connected to Gennum's serializers for a SMPTE-compliant HD-SDI output

·Audio Clock Synthesis (GS4901B only)·Three audio clock outputs
·Generates any audio clock up to 512*96kHz
·Pre-programmed for 7 audio clocks

·Timing Generation·Generates up to 8 timing signals at a time
·Choose from 9 pre-programmed timing signals: H and V sync and blanking, F Sync, F Digital, AFS (GS4911B only), Display Enable, 10FID, and up to 4 user-defined timing signals
·Pre-programmed to generate timing for 9 different video formats

·Genlock Capability·Clocks may be free-running or genlocked to an input reference with a variable offset step size of 100-200ps (depending on exact clock frequency)
·Variable timing offset step size of 100-200ps up to one frame
·Output may be cross-locked to a different input reference
·Freeze operation on loss of reference
·Optional crash or drift lock on application of reference
·Automatic input format detection

·General Features·Reduces design complexity and saves board space - 9mm x 9mm package plus crystal reference replaces multiple VCXOs, PLLs and timing generators
·Pb-free and RoHS Compliant
·Low power operation typically 300mW
·1.8V core and 1.8V or 3.3V I/O power supplies
·64-PIN QFN package