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
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……