■ DESCRIPTION

The Fujitsu MB15F72UL is a serial input Phase Locked Loop (PLL) frequency synthesizer with a 1300 MHz and a 350 MHz prescalers. A 64/65 or a 128/129 for the 1300 MHz prescaler, and a 8/9 or a 16/17 for the 350 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 2.5 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 data format is the same as the previous one MB15F02SL, MB12F72SP. Fast locking is achieved for adopting the new circuit. The new package (BCC20) decreases a mount area of MB15F72UL more than 30 comparing with the former BCC16 (for dual PLL).

MB15F72UL is ideally suited for wireless mobile communications, such as CDMA.

■ FEATURES

• High frequency operation : RF synthesizer : 1300 MHz Max.

: IF synthesizer : 350 MHz Max.

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

• Ultra low power supply current : ICC = 2.5 mA Typ.

(VCC = Vp = 2.7 V, SWIF = SWRF = 0, Ta = +25 °C, in IF, RF 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 : 1300 MHz prescaler (64/65 or 128/129 ) /350 MHz prescaler (8/9 or 16/17)

• 23 bit shift resister

• Serial input 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

• On−chip phase control for phase comparator

• On−chip phase comparator for fast lock and low noise

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

• Operating temperature : Ta = −40 °C to +85 °C

• Serial data format compatible with MB15F02SL

• Small package BCC20 (3.4 mm × 3.6 mm × 0.6 mm)