I'm using the LTC5598 IC for modulation. I am confused as to how to properly feed my BaseBand analog signal into the chip.
According to its datasheet:
The circuit is optimized for a common mode voltage of 0.5V which should be externally applied. The baseband pins should not be left floating because the internal PNP’s base current will pull the common mode voltage higher than the 0.6V limit. This condition may damage the part. In shut-down mode, it is recommended to have a termination to ground or to a 0.5V source with a value lower than 1kΩ. The PNP’s base current is about –68μA in normal operation.
If I understand this correctly, if I want to feed it an instantaneous signal of 0.4V do I set:
BBPI = 0.9V BBMI = 0.5V
This should satisfy the requirement of having a common mode voltage (Vcmbb) of 0.5V?