The LMC567 is a low power general purpose LMCMOS™ tone decoder which is functionally similar to the industry standard LM567. It consists of a twice frequency voltage-controlled oscillator (VCO) and quadrature dividers which establish the reference signals for phase and amplitude detectors. The phase detector and VCO form a phase-locked loop (PLL) which locks to an input signal frequency which is within the control range of the VCO. When the PLL is locked and the input signal amplitude exceeds an internally pre-set threshold, a switch to ground is activated on the output pin. External components set up the oscillator to run at twice the input frequency and determine the phase and amplitude filter time constants.
The LMC567 is a low power general purpose LMCMOS tone decoder functionally similar to the industry standard LM567. It features a twice frequency voltage-controlled oscillator (VCO) and quadrature dividers to establish reference signals for phase and amplitude detectors. A phase-locked loop (PLL) locks to an input signal frequency within the VCO's control range, activating a ground switch on the output pin when the input amplitude exceeds a preset threshold.
| Supply Voltage Range | 2V to 9V |
|---|---|
| Operating Temperature Range | -25°C to +125°C |
| Output Current Capability | 20 mA |
| Maximum Input Frequency | 500 kHz |
| Input Resistance | 40 kΩ |
| Output Saturation Voltage (I8 = 20 mA) | 0.7 Vdc |
The device operates with a supply voltage range of 2V to 9V.
It is functionally similar to the LM567 but requires the oscillator timing capacitor to be halved and filter capacitors reduced by a factor of 8 for substitution.
The output current capability is 20 mA.