UMA1017M

The UMA1017M BICMOS device integrates prescalers, a programmable divider, and phase comparator t mplement a phase-locked loop.

Separate power and ground pins are provided to the analog and digital circuits. The ground leads should be externally short-circuited to prevent large currents flowing across the die and thus causing damage. Digital supplies VDD1 and VDD2 must also be at the same potential. VCC must be equal to or greater than VDD (i.e. VDD = 3 V and VCC = 5 V for wider tuning range).

The phase detector uses two charge pumps, one provides normal loop feedback, while the other is only active during fast mode to speed-up switching. All charge pump currents (gain) are fixed by an external resistance at pin ISET (pin 14). Only passive loop filters are used; the charge-pumps function within a wide voltage compliance range to improve the overall system performance.