Analog Devices Inc.
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PRODUCTION
The ADH985S is an absorptive, voltage variable attenuators (VVAs) which operate from 20 GHz to 50 GHz and is ideal in designs when an analog dc control signal must be used to control RF signal levels over a 35 dB dynamic range. It features two shunt-type attenuators which are controlled by two analog voltages, Vctl1 and Vctl2. Optimum linearity performance of the attenuators is achieved by first varying Vctl1 of the first attenuation stage from −3 V to 0 V with Vctl2 fixed at −3 V. The control voltage of the second attenuation stage, Vctl2, should then be varied from −3 V to 0 V with Vctl1 fixed at 0 V. However, if the Vctl1 and Vctl2 pins are connected together, it is possible to achieve the full analog attenuation range with only a small degradation in Input IP3 performance.
Applications
WELL LINK CHIPS GROUP CO.,LIMITED FLAT/RM 1802 BEVERLY HOUSE 93-107 LOCKHART ROAD WANCHAI HK
