U3742BM

• IC Distinguishes the Signal Strength of Several Transmitters via RSSI (Received Signal Strength Indicator) Output
• Minimal External Circuitry Requirements, No RF Components on the PC Board Except Matching to the Receiver Antenna
• High Sensitivity, Especially at Low Data Rates
• Sensitivity Reduction Possible Even While Receiving
• Fully Integrated VCO
• Low Power Consumption Due to Configurable Self-polling with a Programmable Time Frame Check
• Supply Voltage 4.5 V to 5.5 V
• Operating Temperature Range -40 C to 105 C
• Single-ended RF Input for Easy Adaptation to /4 Antenna or Printed Antenna on PCB
• Low-cost Solution Due to High Integration Level
• ESD Protection According to MIL-STD. 883 (4 KV HBM)
• High Image Frequency Suppression Due to 1 MHz IF in Conjunction with a SAW Front-end Filter (Up to 40 dB Achievable with Newer SAWs)
• Communication to Microcontroller Possible via a Single, Bi-directional Data Line
• Power Management (Polling) is also Possible by Means of a Separate Pin via the Microcontroller

The U3742BM is a multi-chip PLL receiver device supplied in an SO20 package. It has been especially developed for the demands of RF low-cost data transmission systems with data rates from 1 kBaud to 10 kBaud (1 kBaud to 3.2 kBaud for FSK) in Manchester or Bi-phase code. The receiver is well suited to operate with Atmel's PLL RF transmitter IC U2741B. U3742BM's main applications in the area of wireless control are telemetering, security technology, tire-pressure monitoring and keyless-entry systems. U3742BM canbe used in the frequency receiving range of f₀ = 300 MHz to 450 MHz for ASK or FSKdata transmission. All the statements made in this data sheet refer both to433.92 MHz and 315 MHz applications.