LC72121M View Datasheet(PDF) - ON Semiconductor

Part Name

Description

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LC72121M

PLL Frequency Synthesizers for Electronic Tuning

ON Semiconductor 

LC72121, 72121M, 72121V

Clock Time Base Usage Notes

When using the clock time base output function, the output pin (BO1) pull-up resistor must have a value of over 100 kΩ.

The use of a Schmitt input in the microcontroller that accepts this signal is recommended to reduce chattering. This is to

prevent degradation of the VCO C/N characteristics when combining with a loop filter that uses the internal transistor

provided to form a low-pass filter. Although the ground for the clock time base output pin (VSSd) and the ground for the

transistor (VSSa) are isolated internally on the chip, applications must take care to avoid ground loops and minimize

current fluctuations in the time base pin to prevent degradation of the low-pass filter characteristics.

Pin States after a Power on Reset

No. 5815-19/23

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