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| 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 components, making them ideal as miniature VCXO modules. FEATURES I I I I 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) I I I Output enable function High impedance output when OE = LOW (oscillator continues running) -40 to 85C operating temperature range Chip form (CF5072BA) BLOCK DIAGRAM VDD2 VDD1 RP LS X'tal XIN XC 100pF Differential Converter C2 RS VC C1 Pre-buffer ECL OUTN CVC XR RVC OUT 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 recommended. ORDERING INFORMATION Device CF5072BA-1 Package Chip form SEIKO NPC CORPORATION --1 CF5072BA 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 100pF To differential converter C2 RS VC C1 CVC XR RVC VC input VSS1 Note. RP is a damping resistor to prevent parasitic oscillation due the combined effects of the external inductor (expander coil) and varicap capacitance/internal capacitance. It is recommended that RP be connected in parallel with LS. Oscillator internal capacitors (design value) Internal capacitance [pF] (design value) Version C1 CF5072BA 11.2 C2 14.4 Selecting external constants The LS and RP values should be selected such that both (a) the resonance point in the loop formed by LS and C0, CL, CVC is higher than the crystal oscillator frequency, and (b) the resonance point does not satisfy the oscillation condition. (C0 is the crystal shunt capacitance, CL is the oscillator equivalent circuit capacitance, and CVC is the varicap capacitance.) In the oscillator circuit, if the crystal capacitance C0 is 2.85pF, the varicap (CVC) is a HVC350B (Renesas), and the oscillator frequency is 155.52MHz, then values in the order LS = 220nH, RP = 2.2k or LS = 180nH, RP = 1.8k will satisfy the conditions above. The optimal values for LS and RP will vary with crystal characteristics, oscillator frequency, and varicap diode, thus the values selected should be thoroughly evaluated. SEIKO NPC CORPORATION --2 CF5072BA Output Circuit The output is enabled/disabled using the OE pin. Outputs are high impedance when disabled. The OE pin logic is shown in the following table. OE HIGH or open LOW OUT CLK output High impedance OUTN CLK output High impedance OE = HIGH: ON OE = LOW: OFF From pre-buffer VDD1 OUTN OE = HIGH: OFF OE = LOW: ON OUT SEIKO NPC CORPORATION --3 CF5072BA PAD LAYOUT (Unit: m) VDD2 XIN XC Y NC XR VC VSS1 (0,0) X 9 10 11 12 13 1 8 7 6 DB5072BA 5 4 2 TEST 3 (1820,1000) VDD1 OUTN OUT VSS2 OE Chip size: 1.82 x 1.00mm Chip thickness: 300 30m Pad size: 110 x 100m (TEST pin only = 90 x 90m) Chip base: VSS potential PAD DESCRIPTION AND DIMENSIONS Pad dimensions [m] Pad No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Name VSS1 TEST OE VSS2 OUT OUTN VDD1 VDD2 XIN XC NC XR1 VC I/O - I I - O O - - I I - I I Oscillator ground IC test pin (leave open circuit for normal operation) Output enable, with pull-up resistor built-in Ground Differential PECL non-inverting output (true) Differential PECL inverting output (complementary) ECL buffer supply Supply Crystal unit connection Varicap anode connection No connection Varicap cathode connection and inductor connection Control voltage pin Function X 125 1283 1695 1695 1695 1695 1695 643 125 125 125 125 125 Y 135 160 135 268 460 673 865 865 828 708 495 375 255 X 110 90 110 110 110 110 110 100 110 110 110 110 110 Y 100 90 100 100 100 100 100 110 100 100 100 100 100 Pad size [m] 1. The XR pin electrostatic withstand voltage is weaker than the other pins. The electrostatic withstand voltage of pins, excluding XR, is the same as that for existing NPC devices. SEIKO NPC CORPORATION --4 CF5072BA ABSOLUTE MAXIMUM RATINGS Parameter Supply voltage range Input voltage range Storage temperature range Symbol VDD VIN TSTG Conditions Rating VSS - 0.5 to VSS + 7.0 VSS - 0.5 to VDD + 0.5 -65 to 150 Unit V V C RECOMMENDED OPERATING CONDITIONS Rating Parameter Supply voltage Operating temperature Output load Output frequency Symbol VDD TOPR RL fOUT Terminated to VDD - 2V Conditions Min 3.0 -40 - 70 Typ - - 50 - Max 3.6 85 - 200 V C MHz Unit ELECTRICAL CHARACTERISTICS DC Characteristics Recommended operating conditions apply unless otherwise noted Rating Parameter Symbol Conditions Min Current consumption IDD VOH Measurement circuit 2, VDD = 3.3V, OE = OPEN OUT/OUTN LOW-level output voltage OE HIGH-level input voltage OE LOW-level input voltage OE LOW-level input current Input impedance VC resistance Pull-down resistance VOL VIH VIL IIL ZIN RVC RS Measurement circuit 3 Measurement circuit 3 Measurement circuit 4, VIL = 0V Measurement circuit 5, measured between supply and VC Measurement circuit 6, measured between VC and XR Measurement circuit 7, measured between VSS and XC Measurement circuit 1, output terminated to VDD - 2V, OE = OPEN Ta = 0 to 85C Ta = -40C Ta = 0 to 85C Ta = -40C - 2.275 2.215 1.490 1.470 0.7VCC - - 10 100 10 Typ 50 2.350 2.295 1.600 1.605 - - - - 150 20 Max 88 2.420 2.420 1.680 1.745 - 0.3VCC -20 - 200 40 mA V V V V V V A M k k Unit OUT/OUTN HIGH-level output voltage SEIKO NPC CORPORATION --5 CF5072BA AC Characteristics Recommended operating conditions apply unless otherwise noted Rating Parameter Symbol Conditions Min Output duty cycle 1 Output duty cycle 2 Output swing Output rise time Output fall time Output enable delay time Output disable delay time Duty1 Duty2 VOpp tr tf tOE tOD Measurement circuit 1, measured at output crossing point, Ta = 25C, VDD = 3.3V Measurement circuit 1, measured at 50% output swing, Ta = 25C, VDD = 3.3V Measurement circuit 1, peak-to-peak of output waveform Measurement circuit 1, output swing 20% to 80% Measurement circuit 1, output swing 80% to 20% Measurement circuit 3, Ta = 25C Measurement circuit 3, Ta = 25C 45 45 0.4 - - - - Typ 50 50 - 0.5 0.5 - - Max 55 55 - 1 1 200 200 % % V ns ns ns ns Unit VDD tr OUTN OUT tf 80% 20% tW tPER VDD - 2V VSS DUTY1 = (tW/tPER) 100 Figure 1. PECL output waveform tOD OE VDD/2 tOE VDD GND VDD OUT OUTN LOW-level (High impedance) GND Figure 2. OE timing waveform (Differential LVPECL) SEIKO NPC CORPORATION --6 CF5072BA MEASUREMENT CIRCUITS Measurement Circuit 1 Parameters: IDD, Duty1, Duty2, VOpp, tr, tf Measurement Circuit 4 Parameter: IIL A IDD VDD1 RP VDD1 XIN 50 LS XC XR VC VSS1 VSS2 VDD-2V OUTN IIL OUT 50 VDD2 OE VDD2 A VSS1 VSS2 Measurement Circuit 5 Measurement Circuit 2 Parameters: VOH, VOL VDD1 I1 1k VDD1 XIN OUTN TEST OUT VSS1 VSS2 50 VDD2 50 ZIN = VDD/I1 VSS1 VSS2 VDD2 Parameter: ZIN A VC VV VDD-2V VOH,VOL Measurement Circuit 6 Parameter: RVC OUT is tied LOW (VOL) OUTN is tied HIGH (VOH) When XOUT = LOW: OUT is tied HIGH (VOH) OUTN is tied LOW (VOL) When XIN = HIGH: I2 VDD1 VC VDD2 Measurement Circuit 3 Parameters: VIH, VIL, tOE, tOD A XR V2 V VSS1 RVC = V2/I2 VSS2 RP VDD1 XIN VDD2 50 LS XC XR OE OUTN Measurement Circuit 7 50 OUT Parameter: RS VDD-2V VDD1 I3 VDD2 V VIH,VIL VSS1 VSS2 VIH: output state changes VSS VDD VIL: output state changes VDD VSS OE: disable function A V3 V XC VSS1 RS = V3/I3 VSS2 SEIKO NPC CORPORATION --7 CF5072BA Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter "Products") are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from SEIKO NPC CORPORATION (hereinafter "NPC"). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. SEIKO NPC CORPORATION 15-6, Nihombashi-kabutocho, Chuo-ku, Tokyo 103-0026, Japan Telephone: +81-3-6667-6601 Facsimile: +81-3-6667-6611 http://www.npc.co.jp/ Email: sales@npc.co.jp NC0212CE 2006.04 SEIKO NPC CORPORATION --8 |
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