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XR567

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xr567 Circuit
For some applications it is important to have a tone decoder with narrow bandwidth and fast response time. This can be accomplished by the dual time constant tone decoder circuit shown.The circuit has two low-pass loop filter capacitors, C2 and C'2. With no input signal present, the output at pin 8 is high, transistor Q1 is off, and C'2 is switched out of the circuit.Thus, the loop low-pass filter is comprised of C2, which can be kept as small as possible for minimum response time. When an in-band signal is detected, the output at pin 8 will go low, Q1 will turn on, and capacitor C'2 will be switched in parallel with capacitor C2. The low-pass fil-ter capacitance will then be C2 + C'2. The val-ue of C'2 can be quite large in order to achieve narrow bandwidth. During the time that no input signal is being received, the bandwidth is de-termined by capacitor C2.

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