is a monolithic, GaAs binary-weighted five- bit single positive control voltage digital Attenuator
The device operates from 0.4 to 3.0 GHz. DC power consumption is very low, typically 1.5 mA, with a supply voltage of 5 V. The SKY12339-350LF
has an LSB of 1 dB and total attenuation of 31 dB. The two RF ports are bilateral; each can be used as the RF input or the RF output. An external supply voltage of 4.5 to 5.5 V is required. The SKY12339-350LF
is comprised of five cascaded fixed Attenuators
each of which has a shunt bypass switch. Beginning at the 1 dB LSB, each succeeding fixed Attenuator
produces twice the attenuation of the preceding stage. The state of each bypass switch is controlled by the logic level voltage applied to the associated control voltage input. A logic high voltage closes the associated switch, which bypasses that fixed Attenuator
stage; a logic low opens the switch to force the input signal to that stage through the associated Attenuator
A functional block diagram is shown in Figure 1. The pin configuration and package are shown in Figure 2. Signal pin assignments and functional pin descriptions are provided in Table 1.