I am trying to use the ADG419 in a FSK configuration at the out of 2 oscillators, but I am experiencing severe crosstalk to the output making it unusable to drive a transmitter. Data rates are typically 9.6 KB/s or higher. The RF frequencies are in the 2 MHz area. I've tried varying supply voltages and resistive loading on the input and output without any success. Standard TTL logic levels are used. All I am doing is switching between 2 separate oscillators to generate FSK in a very small package. Am I using the wrong device and need a different one. Any suggestions?
MIT Lincoln Lab