ADG5436F - GLITCHES DURING SWITCHING

Question

Hi Forum, 
 
 We were using ADG5436 in our design and since it was not available, we replaced with ADG5436F. 
 
 Following are the voltage levels of ADG5436F: 
 
 VDD = 12V 
 VSS = -12V 
 EN = 3.3 V 
 IN1 = 0V or 5V 
 IN2 = 0V or 5V 
 S1A = 0V or 5V 
 S1B = 0V or 5V 
 S2A = 0V or 5V 
 S2B = 0V or 5V 
 D1 = 0V or 5V 
 D2 = 0V or 5V 
 Rest all pins are No Connect

We observe a glitch in the output pins D1/D2 of ADG5436F during switching. The voltage of glitch is around 2V and pulse width around 600 ns. 
 
 During the switching in ADG5436, there was a glitch, but the voltage level is around 0.5V and pulse width is around 100ns. 
 
 Could anyone please help us in understand the reason behind the glitch, and advise us on what has to be done for this ?

Davidforde · Accepted Answer

Hello, 
 This glitch that you see is likely caused by the Charge injection of the switches. The datasheet shows a difference in Charge injection (Qinj) specifications for the ADG5436 (200 pC) and the ADG5436F ( 724 pC). This is roughly a difference of 4 X, and would account for your glitch being 4x bigger when using the ADG5436F.

The Test Circuit for charge injection shows that the Glitch or Delta Vout is related to the Qinj and the load capacitance. Increasing the load capacitance could be a solution to the higher glitch. 
 
 Regards, 
 David)

Electronic Design Services - PartnerZone

Products In This Thread

ADG5436F - GLITCHES DURING SWITCHING

Top Replies