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■ DESCRIPTION

The Fujitsu MB15F78SP is a serial input Phase Locked Loop (PLL) frequency synthesizer with a 2550 MHz prescaler and a 1200 MHz prescaler. A 32/33 or a 64/65 for the 2550 MHz prescaler, and a 16/17 or a 32/33 for the 1200 MHz prescaler can be selected for the prescaler that enables pulse swallow operation.

The BiCMOS process is used , as a result a supply current is typically 5.5 mA at 2.7 V. The supply voltage range is from 2.4 V to 3.6 V. A refined charge pump supplies well-balanced output current with 1.5 mA and 6 mA selectable by serial data.

The new package (BCC20) decreases an area of MB15F78SP more than 30 comparing with the former BCC16 (for dual PLL).

MB15F78SP is ideally suited for wireless mobile communications, such as GSM.

■ FEATURES

? High frequency operatio : RX synthesizer : 2550 MHz max : TX synthesizer : 1200 MHz max

? Low power supply voltage : VCC = 2.4 to 3.6 V

? Ultra Low power supply current : ICC = 5.5 mA typ. (VCC = Vp = 2.7 V, Ta = +25°C, SWTX = SWRX = 0, in TX/RX locking state)

? Direct power saving function : Power supply current in power saving mode Typ. 0.1 μA (VCC = Vp = 2.7 V, Ta = +25°C), Max. 10 μA (VCC = Vp = 2.7 V)

? Software selectable charge pump current: 1.5 mA/6.0 mA typ.

? Dual modulus prescaler : 2550 MHz prescaler (32/33 or 64/65 )/1200 MHz prescaler (16/17 or 32/33)

? 23-bit shift register

? Serial input binary 14-bit programmable reference divider : R = 3 to 16,383

? Serial input programmable divider consisting of:

- Binary 7-bit swallow counter : 0 to 127

- Binary 11-bit programmable counter: 3 to 2,047

? Built-in high-speed tuning, low-noise phase comparator, current-switching type constant current circuit

? On–chip phase control for phase comparator

? Built-in digital locking detector circuit to detect PLL locking and unlocking

? Operating temperature : Ta = –40 to +85°C

? Sireal data format compatible with MB15F08SL