■ DESCRIPTION

The Fujitsu MB15U10 is a dual serial input phase-locked loop (PLL) frequency synthesizer and is ideally suitable for mobile communications such as cellular phones.

The MB15U10 has two PLL frequency synthesizer circuits on a single chip: one for transmission and the other for reception (PLL1 and PLL2).

It can operate from a +2.6V to 5.5V supply. Fujitsu’s advanced technology achieves an Icc of 7 mA (typical) as well as 10 µA (max.) at power saving mode.

■ FEATURES

• Two PLLs’ for transmission/reception

• Low current consumption : ICC = 7 mA typ. at 3 V

• Power saving function : IPS = 10 µA max.

• Divide ratio setting with serial data input :

Binary 12-bit reference counter:6 to 4,095

Binary 17-bit main counter: 1,024 to 131,071

*Main counters can be programmed individually each other.

• On-chip constant current source charge pumps

• Adjustable charge pump output current with an external resistor

• Lock detection function

• Phase matching circuit helps fast intermittent operation

• Plastic 20-pin SSOP (shrink small outline) package