ST 6100 - HARDWARE GUIDE
changes the reference point for the analog voltage.
If analog accuracy is required, as per Figure 11, the power supply cables should be designed to limit voltage drop. As
well, the application should be aware that current is a function of input voltage and the operating mode (receive,
transmit, sleep).
Figure 11: Analog Accuracy by Limiting Voltage Drop on Return Current
Alternatively for accurate analog measurements, the analog reference can be connected on a separate conductor to
GND as per Figure 12. In this case, it is important that the power supply’s return is fully isolated from the analog
reference voltage to ensure return current does not flow to analog reference.
Figure 12: Analog Accuracy with Independent Analog Reference
T406, VERSION 01
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