DSX321G 40MHZ 8PF 7PPM DSX321G 42.000MHZ DSX321G 44.550MHZ DSX321G 48.000MHZ DSX321G 48.000MHZ 直插晶振 DSX321G 48MHZ DSX321G 48MHZ 8PF DSX321G 50.000MHz DSX321G 50M 12PF 20PPM DSX321G 50MHZ