U2894B

· Supply voltage range 2.7 V to 5.5 V
· Current consumption 50 mA
· Power-down functions
· High-speed PFD and charge pump (CP)
· Small CP saturation voltages (0.5/0.6 V)
· Programmable dividers and CP polarity
· Low-current standby mode

The U2894B 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 U2894B is designed for cellular phones such as GSM900, DCS1800, and PCS1900, applying a transmitter architecture at which the VCO operates at theTX output frequency. No duplexer is needed since the outof- band noise is very low. The U2894B exhibits low power consumption. Broadband operation gives you high flexibility for multi-band frequency mappings. The IC is available in a shrinked small-outline 28-pin packag  (SSO28).

The U2893B offers the same functionality with other divider ratios.