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 ■ ■ ■ ■ 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 RP X'tal VDD1 XIN OUTN XC LS Differential Converter 100pF CVC Pre-buffer ECL OUT XR C2 RVC RS C1 VC Oscillator block equivalent circuit OE VSS2 VSS1 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 Package CF5072BA−1 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 X'tal XIN To differential converter 100pF XC LS CVC XR C2 RVC RS C1 VC 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 CF5072BA C1 C2 11.2 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 = 2.2kΩ or LS = 180nH, RP = 1.8kΩ 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 OUT OUTN HIGH or open CLK output CLK output LOW High impedance High impedance VDD1 OE = HIGH: ON OE = LOW: OFF From pre-buffer OUTN OE = HIGH: OFF OE = LOW: ON OUT SEIKO NPC CORPORATION —3 CF5072BA PAD LAYOUT (Unit: µm) (1820,1000) VDD2 9 10 NC XR VC VSS1 11 12 13 1 8 DB5072BA Y XIN XC (0,0) 2 7 VDD1 6 OUTN 5 OUT 4 VSS2 3 OE TEST X Chip size: 1.82 × 1.00mm Chip thickness: 300 ± 30µm Pad size: 110 × 100µm (TEST pin only = 90 × 90µm) Chip base: VSS potential PAD DESCRIPTION AND DIMENSIONS Pad dimensions [µm] Pad No. Name I/O Pad size [µm] Function X Y X Y 1 VSS1 – Oscillator ground 125 135 110 100 2 TEST I IC test pin (leave open circuit for normal operation) 1283 160 90 90 3 OE I Output enable, with pull-up resistor built-in 1695 135 110 100 4 VSS2 – Ground 1695 268 110 100 5 OUT O Differential PECL non-inverting output (true) 1695 460 110 100 6 OUTN O Differential PECL inverting output (complementary) 1695 673 110 100 7 VDD1 – ECL buffer supply 1695 865 110 100 8 VDD2 – Supply 643 865 100 110 9 XIN I Crystal unit connection 125 828 110 100 10 XC I Varicap anode connection 125 708 110 100 11 NC – No connection 125 495 110 100 12 XR1 I Varicap cathode connection and inductor connection 125 375 110 100 13 VC I Control voltage pin 125 255 110 100 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 Symbol Conditions Rating Unit Supply voltage range VDD VSS − 0.5 to VSS + 7.0 V Input voltage range VIN VSS − 0.5 to VDD + 0.5 V TSTG −65 to 150 °C Storage temperature range RECOMMENDED OPERATING CONDITIONS Rating Parameter Symbol Conditions Unit Min Typ Max Supply voltage VDD 3.0 – 3.6 V Operating temperature TOPR −40 – 85 °C – 50 – Ω 70 – 200 MHz Output load RL Output frequency Terminated to VDD − 2V fOUT ELECTRICAL CHARACTERISTICS DC Characteristics Recommended operating conditions apply unless otherwise noted Rating Parameter Symbol Current consumption IDD OUT/OUTN HIGH-level output voltage VOH Conditions OUT/OUTN LOW-level output voltage Typ Max – 50 88 mA Ta = 0 to 85°C 2.275 2.350 2.420 V Ta = −40°C 2.215 2.295 2.420 V Ta = 0 to 85°C 1.490 1.600 1.680 V Ta = −40°C 1.470 1.605 1.745 V Measurement circuit 1, output terminated to VDD − 2V, OE = OPEN Measurement circuit 2, VDD = 3.3V, OE = OPEN VOL Unit Min OE HIGH-level input voltage VIH Measurement circuit 3 0.7VCC – – V OE LOW-level input voltage VIL Measurement circuit 3 – – 0.3VCC V OE LOW-level input current IIL Measurement circuit 4, VIL = 0V – – −20 µA Input impedance ZIN Measurement circuit 5, measured between supply and VC 10 – – MΩ VC resistance RVC Measurement circuit 6, measured between VC and XR 100 150 200 kΩ Pull-down resistance RS Measurement circuit 7, measured between VSS and XC 10 20 40 kΩ SEIKO NPC CORPORATION —5 CF5072BA AC Characteristics Recommended operating conditions apply unless otherwise noted Rating Parameter Symbol Conditions Unit Min Typ Max Output duty cycle 1 Duty1 Measurement circuit 1, measured at output crossing point, Ta = 25°C, VDD = 3.3V 45 50 55 % Output duty cycle 2 Duty2 Measurement circuit 1, measured at 50% output swing, Ta = 25°C, VDD = 3.3V 45 50 55 % Output swing VOpp Measurement circuit 1, peak-to-peak of output waveform 0.4 – – V Output rise time tr Measurement circuit 1, output swing 20% to 80% – 0.5 1 ns Output fall time tf Measurement circuit 1, output swing 80% to 20% – 0.5 1 ns Output enable delay time tOE Measurement circuit 3, Ta = 25°C – – 200 ns Output disable delay time tOD Measurement circuit 3, Ta = 25°C – – 200 ns VDD tf tr OUTN 80% 20% OUT VDD – 2V tW tPER DUTY1 = (tW/tPER) VSS 100 Figure 1. PECL output waveform tOD tOE OE VDD VDD/2 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 Measurement Circuit 4 Parameters: IDD, Duty1, Duty2, VOpp, tr, tf Parameter: IIL A IDD VDD1 VDD1 RP VDD2 XIN OE 50Ω LS VDD2 OUTN XC IIL XR A VSS1 VSS2 OUT 50Ω VC VSS1 VDD−2V VSS2 Measurement Circuit 5 Parameter: ZIN Measurement Circuit 2 Parameters: VOH, VOL VDD1 VDD2 I1 VDD1 1kΩ A VDD2 VC 50Ω XIN OUTN ZIN = VDD/I1 VSS1 VSS2 TEST OUT VSS1 50Ω VSS2 VDD−2V V V Measurement Circuit 6 VOH,VOL Parameter: RVC When XIN = HIGH: OUT is tied LOW (VOL) OUTN is tied HIGH (VOH) When XOUT = LOW: OUT is tied HIGH (VOH) OUTN is tied LOW (VOL) VDD1 I2 A Measurement Circuit 3 VDD2 VC Parameters: VIH, VIL, tOE, tOD XR V2 V VSS1 VSS2 RVC = V2/I2 VDD1 RP VDD2 XIN 50Ω LS XC XR OUTN Measurement Circuit 7 Parameter: RS OUT 50Ω OE V VSS1 VSS2 VDD−2V VDD1 VIH,VIL VDD2 I3 VIH: output state changes VSS → VDD VIL: output state changes VDD → VSS OE: disable function A XC V3 V VSS1 VSS2 RS = V3/I3 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: [email protected] NC0212CE 2006.04 SEIKO NPC CORPORATION —8