OM5156M中文资料Low-voltage dual frequency synthesizer for radio telephones数据手册恩XP规格书

描述 Description

GENERAL DESCRIPTION
The OM5156M BICMOS device integrates prescalers, programmable dividers, and phase comparators to implement two phase-locked loops. The device is designed to operate from 3 NiCd cells, in pocket phones, with low current and a wide supply voltage range from 2.7 to 5.5 V.
The principal synthesizer operates at RF input frequencies up to 2 GHz the auxiliary synthesizer operates at 300 MHz. The auxiliary loop is intended for the first IF or to transmit offset loop-frequency settings. Each synthesizer has a fully programmable reference divider. All divider ratios are supplied via a 3-wire serial programming bus.FEATURES
• Low current from 3 V supply
• Fully programmable RF divider
• 3-line serial interface bus
• Second synthesizer to control first IF or offset loop frequency
• Independent fully programmable reference dividers for each loop, driven from external crystal oscillator
• Dual phase detector outputs to allow fast frequency switching
• Dual power-down modes.APPLICATIONS
• 2 GHz mobile telephones
• Portable battery-powered radio equipment.

特性 Features

• Low current from 3 V supply
• Fully programmable RF divider
• 3-line serial interface bus
• Second synthesizer to control first IF or offset loop frequency
• Independent fully programmable reference dividers for each loop, driven from external crystal oscillator
• Dual phase detector outputs to allow fast frequency switching
• Dual power-down modes.