Other Parts Discussed in Thread: AFE4490,
I am evaluating the AFE4490 for a new product application. I am using the evaluation kit AFE4490EVM. Section 10.4 of the User Manual (10.4 Using an External ADC (Bypass ADC Mode) (Available Only for AFE4490 Device) describes how to use the device in Bypass mode. It states
"In this mode, the internal ADC of AFE4490 is disabled, one of the internal ADC_RESET clocks is brought out on the PD_ALM pin (PD_ALM is monitored at series jumper resistor R37). This signal is used to convert each of the four phases (with every pulse repetition period). Additionally the ADC_RDY signal (ADC_RDY is monitored at series jumper resistor R26) is used to synchronize the external ADC with the AFE".
I do see the output voltage from the AFE at the RX_OUTP and RX_OUTN pins. I also see the PD_ALM toggling with each cycle. However, I'm not seeing the timing signal at ADC_RDY.
Within the GUI I have set the En Bypass ADC option and the CLKs on ALM pin option. I am monitoring at R37 (PD_ALM) and R26 (ADC_RDY). I see a signal at R37 (PD_ALM) but NOT at R26 (ADC_RDY). I have purchased another eval board (AFE4490SpO2EVM) and see the same issue again. How can I enable an output at R26 (ADC_RDY)?