Broadband Digital Attenuators
The HMC306MS10 offers a least significant bit (LSB) step of 0.5 dB while maintaining a bit error of ± 0.25 dB. Both the HMC273MS10G and the HMC307QS16G offer traditional 1 dB LSB steps with a maximum range of 31 dB. Occupying 14.8 mm2 in a 10 lead MSOP package, the HMC273MS0G is said to be the smallest 5 bit, 31 dB digital attenuator available today. The 2 bit attenuators, HMC290 and HMC291, are available in plastic 6 lead SOT26 package.
All of the attenuators require a single control voltage for each attenuator bit, minimizing logic interface and package lead count. A single positive bias supplied through an external 5 KW resistor is utilized by all products except the negative bias HMC307QS16G. Control and bias currents for each are 100 to 250 mA typical.