Rainbow Electronics U2745B - Manual

Rev. 4734A–RKE–11/03
Features
• Very High Transmitting Frequency Accuracy Compared to SAW Solutions
(Enables Receivers at Lower Bandwidth than with SAW Resonators)
• Lower Cost than the Usual Discrete Solutions Using SAW and Transistors
• Supply Voltage 2.2 V to 4.0 V in the Temperature Range of -40 ° C to 85 ° C
• XTO Output for Clocking the Microcontroller, Thereby Together with the ATAR090 or
ATAR890 Results in the Optimum System Cost-effectiveness
• One-chip Solution with Minimum External Circuitry
• Very Small SSO16 Package, Pitch 0.635, 150 mil
• “Single-ended Open-collector” Output (Same Antennas Can Be Used as in Discrete
Solutions, Simpler Adaptation of Magnetic Loop Antennas)
• ESD Protection According to MIL-STD.883 (4 KV HBM) Except Pins XTO1/ 2,
ANT and LF
Electrostatic sensitive device.
Observe precautions for handling.
Description
The U2745B is a PLL transmitter IC which has been especially developed for the
demands of RF low-cost data transmission systems at data rates up to 20 kBaud.
The transmitting frequency range is 310 MHz to 440 MHz. It can be used in ASK sys-
tems. The main applications of the U2745B are in the areas of outside temperature
metering, socket control, garage door opener, consumption metering, light/fan or air-
condition control, jalousies, wireless keyboard and various other consumer market
applications.
UHF ASK
Transmitter
U2745B