ML 4000 SERIES CERAMIC GaAs CONSTANT GAMMA TUNING VARACTOR DIODES The ML 46450 and ML 46470 Series of tuning varactors are hyperabrupt junction gallium arsenide devices featuring a constant gamma. These series offer especially high "Q factors" (up to 4000) that permit excellent tuning performance from VHF to 40GHz. With these devices, linear tuning of frequency with bias voltage can be achieved for VCOs with wide tuning bands using transistors, Gunns or IMPATTs as well as with tunable filters and amplifiers. These diodes are an excellent choice for modulator applications where better linearity or nearly constant modulation sensitivity is desired. SPECIFICATIONS @ +25c ML 46450 SERIES Total Capacitance Quality Type Number Case Capacitance Ratio (2/20) Factor Style CL, Min./Max. Min. 10%) (pF) ML46450 30 0.5 2.0/2.7 4000 ML46451 30 0.7 2.9/4.1 4000 ML46452 30 1.0 3.6/5.2 3000 ML46453 30 1.2 3.6/5.2 3000 ML46454 30 1.5 3.8/5.5 3000 ML46455 30 1.8 4.1/6.1 3000 ML46456 30 2.0 4.1/6.1 3000 ML46457 30 2.2 4.1/6.1 3000 ML46458 30 2.7 4.5/6.7 2000 ML46459 30 3.3 4.5/6.7 2000 ML46460 30 3.7 4.171 2000 MIL46461 30 47 4.8/7.2 1500 ML46462 30 5.6 4.9/7.4 1500 ML46463 30 6.8 4.9/7.4 1500 ML46464 30 8.2 5.0/7.6 1500 ML46465 30 10.0 5.0/7.6 1500 ML 46470 SERIES Total Type Number Case Capacitance Capacitance Quality Style CL, Ratio (2/20) Factor (10%) (pF) Min./Max. Min. ML46470 30 0.5 2.2/3.2 4000 ML46471 30 0.7 3.6/5.3 4000 ML46472 30 1.0 4.8/7.) 3000 ML46473 30 1.2 4.8/7.1 3000 ML46474 30 15 5.0/7.4 3000 ML46475 30 18 6.6/8.7 3000 ML46476 30 2.0 6.6/8.7 3000 ML46477 30 2.2 6.6/8.7 3000 ML46478 30 2.7 6.4/10.0 2000 ML46479 30 3.3 6.4/10.0 2000 ML46480 30 3.7 6.8/11.0 2000 ML46481 30 47 6.9/11.1 1500 ML46482 30 5.6 7.2015 1500 ML46483 30 6.8 7.2/1.5 1500 ML46484 30 8.2 7.2/1.5 1500 ML46485 30 10.0 7.5/12.0 1500 NOTES L. All GaAs tuning varactors are available as standard in the ODS 30 package. Alternative package styles including chip form are available on request. When ordering, specify the desired case style by adding the case designation as a suffix to the type number. 2. Case parasitics (C, and L,) are given in the case styles section. The C, values listed typically have tolerances of 0.02 pF. 3 The nominal tolerances at 4 Volts is 10%. Closer tolerances are available upon request. By adding the suffix A to the part number a tolerance of 5% can be obtained. 4. Gamma is within the limits of 0.90 <y< 1.10 and 1.13 <y< 1.40 for the ML 46450 and ML 46470 series respectively over the voltage range of 2-20 Volts. Total capacitance of the packaged diodes will deviate from constant gamma characteristics due to differences in case capacitance (C,). M/A-COM Ltd, Humphrys Road, Dunstable, Bedfordshire, LU5 4SX United Kingdom. Europe: (44) 1344 869595 . North America: 800 366 2266 a Asia Pacific: (81) 3 3226 1671 424 continued/... ML 4000 SERIES 5. Capacitance is measured at | MHz using a shielded test holder. Diode Q is measured by the modified DeLoach technique at -4 Volts and extrapolated to 5OMHz. Parasitic inductance (L,) has been determined at X Band using the modified Del. oach method measurement. Breakdown voltage (V,) is 22V minimum measured at 10 microamps. a The total capacitance and capacitance ratios shown are for devices houses in case style 30. Other cases styles will result in different values. TYPICAL PERFORMANCE 10 10 9 8 8 2? CHIP 2 co 6 o Ne a ML 46478 o o 4 a z q 464 < 5 ML 3 q Ww a oO < 06 z E 2 2 04 5 < F 02 3 0.1 1 1 2 3 4 5678910 20 30 1 2 3 4 5 678 1012 20 REVERSE BIAS VOLTAGE (VOLTS) REVERSE BIAS VOLTAGE (VOLTS} YOTAL CAPACITANCE vs REVERSE BIAS VOLTAGE CAPACITANCE RATIO vs REVERSE BIAS VOLTAGE (CASE STYLE 30) (CASE STYLE 30) 2.0 1.75] ]-| -~-~ ]- ~--] ]-+--]---|- -| | -- 1.50 apes] P| - |---| ]_-4 = =10% ML 46470 3 4.25 DITTO TTT Lobb L Litt iig LtilTA < 10% ML 46450 | 1 0 de L Ln z= een bended L 2 ZL i z ra 2 . 1 0.5|- | --} _]~----| _ |-|- oO 2 4 6 8 10. 12 214 6 18 20 VOLTAGE (VOLTS) GAMMA vs VOLTAGE 10 8 9 ACIT E = 0.18 pF 8 6 co > q ,? CHIP & fg a YN . EK 5 o a ML 464 2 9 4 x a ML 4 6 7 x 3 Z r z < 2 04 - 2 < a 5 < e a u 0.1 1 1 2 345 67810 20 30 1 2 3 4 5 678 1012 20 REVERSE BIAS VOLTAGE (VOLTS) REVERSE BIAS VOLTAGE (VOLTS) OTAL CAPACITANCE s REVERSE BIAS VOLTAGE CAPACITANCE RATIO vs REVERSE BIAS VOLTAGE (CASE STYLE 30) (CASE STYLE 30) M/A-COM Ltd, Humphrys Road, Dunstable, Bedfordshire, LUS 4SX United Kingdom. Europe: (44) 1344 869595 a North America: 800 366 2266 2 Asia Pacific: (81) 3 3226 1671 425