HMC985 v01.0114 GaAs MMIC VOLTAGE - VARIABLE ATTENUATOR, 20 - 50 GHz 0 Typical Applications Features t he h MC985 is ideal for: Wide Bandwidth: 20 - 50 gh z excellent l inearity: +32 dB input ip3 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 s ensors General Description Military, eCM & r adar the hMC985 is an absorptive Voltage Variable attenuator (VVa) which operates from 20 - 50 g h 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 -3V to 0V with Vctrl2 fixed at -3V. t he control voltage of the second attenuation stage, Vctrl2, should then be varied from -3V to 0V with Vctrl1 fixed at 0V. however, 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 Condition Min. t yp. Max. u nits 20 - 27 3 3.5 dB insertion l oss 27 - 35 3 4 dB 35 - 50 3.5 4.5 dB 20 - 27 25 30 dB attenuation r ange 27 - 35 30 35 dB 35 - 50 35 40 dB input r eturn l oss 13 dB o utput r eturn l oss 13 dB input t hird o rder intercept 33 dBm 1 (two-tone input power = 10 dBm each t one) 1 VCtr 2 = -3, VCtr 1 = -2.0 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., For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824 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: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Phone: 781-329-4700 Order online at www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 0 - 1 Trademarks and registered trademarks are the property of their respective owners. Application Support: Phone: 1-800-ANALOG-D Application Support: Phone: 978-250-3343 or apps hittite.com attenuators - analog - ChipHMC985 v01.0114 GaAs MMIC VOLTAGE - VARIABLE ATTENUATOR, 20 - 50 GHz Attenuation vs. Frequency over Vcntl = Attenuation vs. Frequency over Vcntl1 = 0 Variable, Vcntrl2 = -3V 0V, Vctrl2 = Variable 0 0 -10 -5 -20 -10 -30 -40 -15 -2.4V -2.4V -2.0V -2.0V -50 -1.6V -1.6V -1.2V -20 -1.2V -0.8V -0.8V -0.4V -60 -0.4V 0.0V 0.0V -25 -70 20 25 30 35 40 45 50 20 25 30 35 40 45 50 FREQUENCY (GHz) FREQUENCY (GHz) Attenuation vs. Vcnrl1 Attenuation vs. Vcntrl2 Over Temperature 30 GHz, Vctrl2 = -3V Over Temperature 30 GHz, Vctrl1 = 0V 0 0 -5 -3 +25C +25C -10 +85C +85C -55C -55C -15 -6 -20 -25 -9 -30 -35 -12 -40 -15 -45 -2.4 -2 -1.6 -1.2 -0.8 -0.4 0 -2.4 -2 -1.6 -1.2 -0.8 -0.4 0 Vctrl1 (V) Vctrl1 (V) Attenuation vs. Pin 30 GHz Attenuation vs. Pin 30 GHz Vctrl1 = Variable, Vctrl2 = -3V Vctrl2 = Variable, Vctrl1 = 0V 0 0 -2.4 V -0.8 V -2.0 V -0.4V -4 -1.6V 0.0 V -10 -1.2V -8 -20 -12 -30 -16 -2.4 V -0.8 V -2.0 V -0.4V -40 -20 -1.6V 0.0 V -1.2V -24 -50 0 3 6 9 12 15 18 21 24 0 3 6 9 12 15 18 21 24 INPUT POWER (dBm) INPUT POWER (dBm) Information furnished by Analog Devices is believed to be accurate and reliable. However, no For price, delivery, and to place orders: Analog Devices, Inc., For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824 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: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Phone: 781-329-4700 Order online at www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 0 - 2 Trademarks and registered trademarks are the property of their respective owners. Application Support: Phone: 1-800-ANALOG-D Application Support: Phone: 978-250-3343 or apps hittite.com ATTENUATION (dB) ATTENUATION (dB) ATTENUATION (dB) ATTENUATION (dB) ATTENUATION (dB) ATTENUATION (dB) attenuators - analog - Chip