General Description

The PMB 2347 is a RF/IF double PLL frequency synthesizer implemented in Infineon’ high speed BiCMOS technology B6HFC. The device contains two PLLs with integrated prescalers especially designed for use in battery powered radio equipment and mobile telephones. Primary applications are single- and dual-band digital cellular systems e.g. GSM, PCN (DCS 1800) and PCS systems.

Features

■ Operation range 2.7 to 5.0 V

■ Low operating current consumption

■ Programmable power down modes

■ High input sensitivity and high input

frequencies: PLL1 (RF): 2.8 GHz

PLL2 (IF): 500 MHz

■ Programmable dual modulus

prescaler divide ratio:

PLL1: 1:64/65 or 1:32/33

PLL2: 16/17 or 1:8/9

Dividing ratios:

A counters: PLL1: 0 to 63

PLL2: 0 to 15

N counters: PLL1: 3 to 16,383

PLL2: 3 to 16,383

R counters 3 to 16,383 for PLL1 and PLL2

■ Fast phase detectors and charge pump outputs without dead zone

■ High phase noise performance

■ Switchable polarity and programmable phase detector currents

■ External reference current setting for PD outputs

■ Fast serial 3-wire bus interface with

low threshold voltage Schmitt-Trigger inputs for interfacing with low

voltage baseband circuits

■ Two data registers in PLL2 for fast

IF band switching

■ A programmable multi-functional

output port for lock detect (quasidigital lock detect) and test mode