HMC713MS8E Enable Pin

Question

Hi all, I have a question regarding the HMC713MS8E logarithmic detector. I want to use it as a power detector from 800MHz to 2000MHz. 
 The datasheet shows a power up timming diagram with the relationship between Vcc and the voltage on the Enable pin to ensure a proper power up. 
 What does this mean? What are the effects of connect the Enable pin to VCC through an resistor? 
 I don't intent to use the power down function of the detector, I want to keep it always enable. 
 
 Thank you and hope you are doing well in this hard times 
 Santiago

ADIApproved · Accepted Answer

Hello Santiago, 
 The HMC713MS8E does indeed require the power-up sequencing as shown to ensure proper startup under all possible operating conditions. The sequencing can be achieved many ways: Perhaps if there is a microcontroller in your system, the MCU can generate the EN signal. Or a dedicated comparator IC with hysteresis can provide a simple solution. 
 Another choice is to use HMC713LC3E, which does not have this power sequencing requirement. 
 Hope that helps. #STAYWELL 
 -Bruce

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HMC713MS8E Enable Pin

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