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U2893B

器件名称: U2893B
功能描述: Modulation PLL for GSM, DCS and PCS Systems
文件大小: 294.48KB    共14页
生产厂商: TEMIC
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简  介:U2893B Modulation PLL for GSM, DCS and PCS Systems Description The U2893B 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 U2893B is designed for cellular phones such as GSM, DCS1800, and PCS1900, applying a transmitter-architecture where the VCO is operated at the TX output frequency. U2893B exhibits low power consumption, and the powerdown function extends battery life. The IC is available in a shrinked small-outline 28–pin package (SSO28). Features D Supply voltage down to 2.7 V D Current consumption 40 mA D Power-down function D Low-current standby mode D High-speed PFD and charge pump D Integrated dividers Benefits D D D D D High-level RF integration TX architecture saves filter costs Low external part count Small SSO28 package One device for various applications Block Diagram MDLO I NI Q NQ PUMIX PU MIXO MIXLO MDO NMDO + 90 grd Voltage reference Mixer RF NRF I/Q modulator N:1 divider R:1 divider Mode control GND CPC GNDP MUX PFD VSP CPO VS1 VS2 VS3 ND NND RD NRD MC 12494 Figure 1. Block diagram TELEFUNKEN Semiconductors Rev. A1, 29-Jan-97 1 (14) Preliminary Information U2893B Pin Description I NI MDLO GND MDO NMDO 1 2 3 4 5 6 28 27 26 25 24 Q NQ VS3 MIXO GND 23 NRF 22 RF 21 VS2 VS1 7 VSP 8 CPO 9 20 MIXLO 19 18 17 16 15 12495 GNDP 10 CPC 11 PU GN……
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U2893B Modulation PLL for GSM, DCS and PCS Systems TEMIC
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