CF5072BA Datasheet | Nippon Precision Circuits

CF5072BA 155MHz VCXO Module IC .. OVERVIEW The CF5072BA is 155MHz VCXO IC. It incorporates a 155.52MHz fundamental frequency oscillator circuit and a differential LVPECL output circuit on a single chip. The oscillator circuit Features characteristics optimized for VCXO operation, and includes a varicap connection pin. The CF5072BA can be configured with few external ponents, making them ideal as miniature VCXO modules. Features 3.0 to 3.6V operating supply voltage range 70MHz to 200MHz oscillator frequency range Differential LVPECL output 50 ± 5% output duty (measured at the output crossing point) Output enable function High impedance output when OE = LOW (oscillator continues running) - 40 to 85°C operating temperature range Chip form (CF5072BA) BLOCK DIAGRAM VDD2 VDD1 RP LS X'tal XIN XC 100p F Differential Converter C2 RS VC C1 Pre-buffer ECL OUTN CVC XR RVC Oscillator block equivalent circuit VSS1 OE VSS2 ESD sensitive device: The XR pin is not equipped with a protection circuit. Accordingly, its electrostatic withstand voltage is significantly lower than that of the other pins. ESD breakdown prevention handling precautions are strongly remended. ORDERING INFORMATION Device CF5072BA- 1 Package Chip form SEIKO NPC CORPORATION - 1 FUNCTIONAL DESCRIPTION Oscillator Equivalent Circuit .. The oscillator can be represented by the equivalent circuit shown below. The crystal unit is connected to XIN, and the other terminal is connected to the LS and RP network. A varicap is added with cathode connected to XR, and anode connected to XC. The control voltage is applied to the VC pin, with high-resistance element connected between VC and XR built-in. RP LS X'tal XIN XC 100p F To differential converter C2 RS VC...