Data Sheet

ADL8143

USING RBIAS AS A FAST ENABLE AND DISABLE FUNCTION

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Rev. 0 | 15 of 17

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

input. By incorporating a single-pole, double throw (SPDT) switch to

the RBIAS pin, an enable and/or disable circuit can be implemented

as shown in Figure 50. The ADG719 complementary metal-oxide

semiconductor (CMOS) switch is used to connect the RBIAS resis-

tor between GND and 1.8 V. When the RBIAS resistor is connected

to ground and the RF input level is −20 dBm, the overall current

consumption reduces to less than 1 mA. Figure 51 shows a plot of

the turn on and/or turn off response time of the RF output envelope

when the IN pin of the ADG719 is pulsed. Note that because the

ADG719 has a minimum supply voltage of 1.8 V, the supply voltage

for ADG719 and ADL8143 has been set to 1.8 V instead of 1.5 V to

satisfy that requirement.

Figure 50. Fast Enable and Disable Using a 0 V to 1.8 V Pulse on the RBIAS Resistor

Figure 51. On and/or Off Response of the RFOUT Envelope When the IN Pin of the ADG719 Is Pulsed