UHF ASK/FSK Receiver
Description
U3741BM
UHF ASK/FSK Receiver
Description
The U3741BM is a multi-chip PLL receiver device supplied in an SO20 package.
It has been specially developed for the demands of RF low-cost data transmission systems with low 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 the TEMIC PLL RF transmitter U2741B.
Its main
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applications are in the areas of telemetering, security technology and keyless-entry systems.
It can be used in the frequency receiving range of f0 = 300 MHz to 450 MHz for ASK or FSK data transmission.
All the statements made below refer to 433.
92-MHz and 315-MHz applications.
Features
D Minimal external circuitry requirements, no RF components on the PC board except adaptation to the receiver antenna D High sensitivity, especially at low data rates D Sensitivity reduction possible even while receiving D Fully integrated VCO D Low power consumption due to configurable self polling with a programmable timeframe check D Supply voltage 4.
5 V to 5.
5 V, operating temperature range –40°C to 105°C D Single-ended RF input for easy adaptation to l /4 antenna or printed antenna on PCB D Low-cost solution due to high integration level D ESD protection according to MIL-STD.
883 (4KV HBM) except Pin POUT (2KV HBM) D High image frequency suppression due to 1 MHz IF in conjunction with a SAW front-end filter.
Up to 40 dB is thereby achievable with newer SAWs.
D Programmable output port for sensitivity selection or for controlling external periphery D Communication to m C possible via a single, bi-directional data line D Power management (polling) is also possible by means of a separate pin via the m C D 2 different IF bandwidth versions are available (300 kHz and 600 kHz)
System Block Diagram
UHF ASK/FSK Remote control transmitter UHF ASK/FSK Remote control receiver
1 Li cell
U2741B
PLL
U3741BM
Demod.
Control 1.
.
.
3
mC
Encoder M44Cx9x Keys
XTO
IF Amp
Ante...
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