The HMC985A is an absorptive voltage variable attenuator (VVA) which operates from 20 - 50 GHz and is ideal in designs where 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, 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. The 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.
Applications
Features and Benefits
| RF & Microwave |
| Document | note |
| HMC985A-Die: GaAs MMIC VOLTAGE - VARIABLE ATTENUATOR, 20 - 50 GHz Data Sheet | PDF 1.89 M |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| HMC985A Pre-Release | CHIPS OR DIE | OTH 25 | -40 to 85C | 57.53 | 46.6 | Y |
