Hyperabrupt Junction Tuning Varactor SMV1270-079 Features ■ High Capacitance Ratio ■ Ultra Small Size SC-79 Package ■ Designed for High Volume, Low Cost Battery Applications ■ Available in Tape and Reel Packaging Description The SMV1270-079 is a silicon hyperabrupt junction varactor diode specifically designed for battery operation.The specified high capacitance ratio and low RS of this varactor make it appropriate for low noise VCOs used at frequencies in wireless systems to beyond 2.5 GHz. Applications include low noise and wideband UHF and VHF VCO for GSM, PCS, CDMA and analog phones. Absolute Maximum Ratings Characteristic Value Forward Current (IF) 20 mA Power Dissipation (PD) 250 mW Storage Temperature (TST) -55°C to +150°C Operating Temperature (TOP) -55°C to +125°C Electrical Specifications at 25°C Parameter Condition Min. Typ. Reverse Current (IR) VR = 20 V Capacitance (CT) CT @ 0.5 V, VR = 0.5 V, F = 1 MHz 22.1 23.6 Capacitance (CT) CT @ 2.5 V, VR = 2.5 V, F = 1 MHz 7.7 8.6 Capacitance Ratio (CTR) CT (0.5 V)/CT (2.5 V) 2.3 2.7 Series Resistance (RS) VR = 1 V, F = 470 MHz Breakdown Voltage (VBR) IR = 10 µA Max. Unit 20.0 nA 25.1 pF 9.8 pF 0.7 20.0 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 6/99A Ω V 1 Hyperabrupt Junction Tuning Varactor SMV1270-079 Typical Performance Data Capacitance vs. Voltage Capacitance (pF) 25 VR (V) CT (pF) 0.5 23.64 1.0 17.81 1.5 13.69 2.0 10.74 2.5 8.60 3.0 7.03 3.5 5.87 4.0 5.00 4.5 4.35 5.0 3.85 20 15 10 5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Varactor Voltage (V) Capacitance vs. Voltage SPICE Model PORT P_anode port = 1 Percent of Variation (%) 5 4 VVAR = 1 V IND LS L = LS 3 VVAR = 2.5 V 2 1 VVAR = 4 V 0 RES RS R = RS -1 -2 -3 -4 -40 -20 0 20 40 60 80 CAP CP C = CP DIODE Varactor_Diode AREA = 1 MODEL = Diode_Model MODE = nonlinear Temperature (˚C) Relative Capacitance Change vs. Temperature SC-79 CATHODE 0.006 (0.15 mm) MIN. INDICATOR 0.010 (0.25 mm) MIN. 0.014 (0.35 mm) MAX. 1 2 PORT P_Cathode port = 2 Part Number CJO (pF) VJ (V) M CP (pF) RS Ω) (Ω LS (nH) SMV1270-079 30 12 8 2 0.7 1.7 0.028 (0.70 mm) MIN. 0.035 (0.90 mm) MAX. 0.060 (1.50 mm) MIN. 0.067 (1.70 mm) MAX. 0.043 (1.10 mm) MIN. 0.051 (1.30 mm) MAX. 0.020 (0.50 mm) MIN. 0.028 (0.70 mm) MAX. 10˚ MAX. 0.003 (0.07 mm) MIN. 0.008 (0.20 mm) MAX. 10˚ MAX. 2 DIODEM Diode_Model IS = 1.00e-14 RS = 0 N=1 TT = 0 CJO = CJO M=M EG = 1.11 XTI = 3 KF =0 AF =1 FC = 0.5 BV = 0 IBV = 1e-3 ISR = 0 NR = 2 IKF = 0 NBV = 1 IBVL = 0 NBVL = 1 TBV1 = 0 TNOM = 27 FFE = 1 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com Specifications subject to change without notice. 6/99A