器件名称: U2896B-MFCG3
功能描述: Modulation PLL for GSM, DCS and PCS Systems
文件大小: 581.31KB 共13页
简 介:U2896B
Modulation PLL for GSM, DCS and PCS Systems
Description
The U2896B is a monolithic integrated circuit. It is realized using TEMIC’s advanced silicon bipolar UHF5S technology. The device integrates a mixer, an I/Q modulator, a phase-frequency detector (PFD) with two synchronous programmable dividers, and a charge pump. The U2896B is designed for cellular phones such as GSM900, DCS1800, and PCS1900, applying a transmitter architecture at which the VCO operates at the TX output frequency. No duplexer is needed since the out-of-band noise is very low. The U2896B exhibits low power consumption. Broadband operation gives high flexibility for multi-band frequency mappings. The IC is available in a shrinked small-outline 36-pin package (SSO36). Electrostatic sensitive device. Observe precautions for handling.
Features
D Supply voltage range 2.7 V to 5.5 V D Current consumption 50 mA D Power-down functions D High-speed PFD and charge pump (CP) D Small CP saturation voltages (0.5/0.6 V) D Programmable dividers and CP polarity D Low-current standby mode
Benefits
D D D D D D
Novel TX architecture saves filter costs Extended battery operating time without duplexer Less board space (few external components) VCO control without voltage doubler Small SSO36 package One device for all GSM bands
Block Diagram
VS1 GND1 I NI 6 MDLO 3 NMDLO 4 MDO NMDO 7 8 Modulator 5 1 2 Q NQ 36 LO VRef 90° Mixer 24 31 29 28 30 35 23 PU NMIXOMIXO PUMIX MIXLO 32 33 34 25
NMIXLO VS3 RF NRF GND3
22 ND NND……
