This document describes the features and characteristics of the U2894B monolithic integrated circuit (IC). The IC is designed for cellular phones such as GSM900, DCS1800, and PCS1900. It integrates a mixer, an I/Q modulator, a phase-frequency detector (PFD) with two synchronous programmable dividers, and a charge pump. The IC uses a transmitter architecture in which the VCO operates at the TX output frequency. No duplexer is needed since the out-of-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 package (SSO28). The U2893B offers the same functionality with other divider ratios. This IC is an electrostatic sensitive device. Observe precautions for handling.
The U2894B is a monolithic integrated circuit realized using TEMIC's advanced silicon bipolar UHF5S technology. It integrates a mixer, an I/Q modulator, a phase-frequency detector (PFD) with two synchronous programmable dividers, and a charge pump. The device is designed for cellular phones such as GSM900, DCS1800, and PCS1900, applying a transmitter architecture where the VCO operates at the TX output frequency, eliminating the need for a duplexer.
| Supply voltage range | 2.7 V to 5.5 V |
|---|---|
| Current consumption | 50 mA |
| Package type | SSO28 |
| Ambient temperature (operating) | -20 to +85 °C |
| N:1 divider frequency | 100 to 600 MHz |
| R:1 divider frequency | 100 to 600 MHz |
| Charge-pump output voltage range | 0.5 V to 4.9 V |
The device is designed for cellular phones such as GSM900, DCS1800, and PCS1900.
No, a duplexer is not needed since the out-of-band noise is very low.
The settling time for the output power within 10% of steady state values is 5 to 10 ps.