Rainbow Electronics U3742BM - Manual

Rev. 4735A–RKE–11/03
Features
• 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 λ /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
Description
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 Manches-
ter or Bi-phase code. The receiver is well suited to operate with Atmel's PLL RF
transmitter IC U2741B. Its main applications in the area of wireless control are teleme-
tering, security technology, tire-pressure monitoring and keyless-entry systems. It can
be used in the frequency receiving range of f
0
= 300 MHz to 450 MHz for ASK or FSK
data transmission. All the statements made in this data sheet refer both to
433.92 MHz and 315 MHz applications.
UHF ASK/FSK
Receiver
U3742BM