HMC985A v03.0320 GaAs MMIC VOLTAGE - VARIABLE ATTENUATOR, 20 - 50 GHz 0 Typical Applications Features t he h MC985a is ideal for: Wide Bandwidth: 20 - 50 gh z excellent l inearity: +30 dB input ip 3 point-to-point r adio Wide attenuation r ange: 35 dB Vsat r adio Die s ize: 2.78 x 1.37 x 0.1 mm t est instrumentation Microwave sensors General Description Military, eCM & r adar t he hMC985a is an absorptive Voltage Variable attenuator (VVa) which operates from 20 - 50 gh z and is ideal in designs where an analog DC control signal Functional Diagram must be used to control r F signal levels over a 35 dB dynamic range. it features two shunt-type attenuators which are controlled by two analog voltages, Vctrl1 and Vctrl2. optimum linearity performance of the attenuator is achieved by first varying Vctrl1 of the first attenuation stage from -5V to 0V with Vctrl2 fixed at -5V. t he control voltage of the second attenuation stage, Vctrl2, should then be varied from -5V to 0V with Vctrl1 fixed at 0V. Furthermore, if the Vctrl1 and Vctrl2 pins are connected together it is possible to achieve the full analog attenuation range with only a small degradation in input ip3 performance. applications include agC circuits and temperature compensation of multiple gain stages in microwave point to point and Vsat radios. Electrical Specifications, T = +25 C, See Test Conditions A parameter Frequency Min. typ. Max. u nits 20 - 27 2.4 3.1 dB insertion l oss 27 - 35 2.3 3.4 dB 35 - 50 3.2 4.0 dB 20 - 27 34 40 dB attenuation r ange 27 - 35 38 41 dB 35 - 50 40 45 dB input r eturn l oss 13 dB o utput r eturn l oss 13 dB input t hird o rder intercept 30 dBm 1 (two-tone input power = 10 dBm each t one) 1 Vctrl2 = -5, Vctrl1 = -3.2 worst case Information furnished by Analog Devices is believed to be accurate and reliable. However, no For price, delivery, and to place orders: Analog Devices, Inc., responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 rights of third parties that may result from its use. Specifications subject to change without notice. No Phone: 781-329-4700 Order online at www.analog.com 0 - 1 license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Application Support: Phone: 1-800-ANALOG-D attenuators - analog - ChipHMC985A v03.0320 GaAs MMIC VOLTAGE - VARIABLE ATTENUATOR, 20 - 50 GHz Attenuation vs. Frequency over Vctrl = Attenuation vs. Frequency over Vctrl1 = 0 Variable, Vctrl2 = -5V 0V, Vctrl2 = Variable 0 0 -10 -5 -20 -10 -30 -15 -40 -20 -50 -25 -60 -30 -70 20 25 30 35 40 45 50 20 25 30 35 40 45 50 FREQUENCY (GHz) FREQUENCY (GHz) -4.0 V -2.4 V 0.0 V -4.0 V -2.4 V 0.0 V -3.4 V -1.6 V -3.4 V -1.6 V -3.0 V -1.0 V -3.0 V -1.0 V Attenuation vs. Vctrl1 Attenuation vs. Vctrl2 Over Temperature 30 GHz, Vctrl2 = -5V Over Temperature 30 GHz, Vctrl1 = 0V 0 0 -3 -5 -6 -10 -9 -15 -12 -20 -15 -25 -18 -30 -21 -35 -24 -40 -27 -45 -30 -50 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 Vctrl1 (V) Vctrl2 (V) +25 C +85 C -55 C +25 C +85 C -55 C Attenuation vs. Pin 24 GHz Attenuation vs. Pin 24 GHz Vctrl1 = Variable, Vctrl2 = -5V Vctrl2 = Variable, Vctrl1 = 0V 0 0 -4 -10 -8 -20 -12 -30 -16 -40 -20 -50 -24 0 3 6 9 12 15 18 21 24 0 3 6 9 12 15 18 21 24 INPUT POWER (dBm) INPUT POWER (dBm) -4.0 V -2.4 V 0.0 V -4.0 V -2.4 V 0.0 V -3.2 V -2.0 V -3.2 V -2.0 V -2.8 V -1.2 V -2.8 V -1.2 V For price, delivery, and to place orders: Analog Devices, Inc., One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 Phone: 781-329-4700 Order online at www.analog.com 0 - 2 Application Support: Phone: 1-800-ANALOG-D ATTENUATION (dB) ATTENUATION (dB) ATTENUATION (dB) ATTENUATION (dB) ATTENUATION (dB) ATTENUATION (dB) attenuators - analog - Chip