DESCRIPTION
The U2893B is a monolithic integrated circuit. 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...
TEMIC Semiconductors
