General Description
The input signal to the FX105A is ac coupled to the buffer amplifier input, which is internally biased at 50% of supply voltage. The signal appears at the output of the buffer amplifier as an ac voltage superimposed on the dc bias level. The signal is then coupled via RV and RW to the voltage controlled oscillator (VCO) and word sampling switches, which cyclically connect C2 and C3 into the circuit to form four sample-and-hold RC circuit integrators.

FEATUREs
· Operates in High Noise Conditions
· ³ 36dB Signal Input Range
· High Sensitivity
· Low Power
· Adjustable Bandwidth
· Adjustable Frequency
· Wide Voltage Range (2.7V to 5.5V)
· Single and Multitone System Applications