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How to Drive LTC1043's Clock Externally (and Simulate in LTSPICE)? 

I would like to drive LTC1043 (Dual Precision Instrumentation Switched Capacitor Building Block)'s clock externally. In the datasheet ( ), it is stated that "The LTC1043 can also be driven with an external CMOS clock". Then, i figure out it can be driven from the pin number 16 (Cosc).

My question is how can I simulate this clock working in LTSPICE? And How can I make sure that the internal clock frequency is actually the clock I applied externally? This is important for me because i will use this clock rate to simulate a switched capacitor resistance emulation and this resistance value depends on the clock rate.