Data Sheet

ADL8140

USING RBIAS AS A FAST ENABLE AND DISABLE FUNCTION

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Rev. 0 | 16 of 18

The RBIAS pin can be used as a fast enable and disable control

input. In Figure 51, a single-pole, double throw (SPDT) switch is

used to switch the voltage on the RBIAS resistor between 0 V and 2

V. When the voltage on the RBIAS pin is equal to 0 V, IDQ reduces

to less than 1 mA with POUT at 0 dBm. The response time of the

ADL8140's output envelope is shown in Figure 52. The ringing on

the response trace is caused by interconnecting wires between the

ADG719 and ADL8140 circuit boards used in the measurement.

Note that because ADG719 has a minimum supply voltage of 1.8 V,

the supply voltage for ADG719 and ADL8140 is set to 2 V.

Figure 51. Fast Enable and Disable Using a 0 V to 2.0 V Pulse on the RBIAS

Resistor

Figure 52. On and Off Response of the ADL8140 RF Output Envelope When

the IN Pin of the ADG719 Is Pulsed, POUT = 5 dBm at 12 GHz