Maker : TEMIC Semiconductors
Part No. : U3741BM

  Datasheet PDF : U3741BM.pdf
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Product Information

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 www.DataSheet4U.com 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 Antenna Antenna VCO PLL XTO Power amp. LNA VCO 14917 Figure 1. System block diagram Rev. A1, 15-Oct-98 1 (25) Preliminary Information U3741BM Ordering Information Extended Type Number U3741BM-M2FL U3741BM-M2FLG3 U3741BM-M3FL U3741BM-M3FLG3 Package SO20 SO20 SO20 SO20 Remarks 2: IF bandwidth of 300 kHz, tube 2: IF bandwidth of 300 kHz, taped and reeled 3: IF bandwidth of 600 kHz, tube 3: IF bandwidth of 600 kHz, taped and reeled www.DataSheet4U.com Pin Description SENS 1 20 DATA Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 FSK/ASK 2 19 18 ENABLE TEST POUT CDEM 3 AVCC 4 17 AGND 5 DGND 6 7 16 MODE 15 DVCC MIXVCC 14 XTO LFGND LF LNAGND LNA_IN 8 9 13 12 n.c. 10 14844 11 LFVCC Figure 2. Pinning SO20 17 18 19 20 Symbol Function SENS Sensitivity-control resistor FSK/ASK Selecting FSK/ASK Low: FSK, High: ASK CDEM Lower cut-off frequency data filter AVCC Analog power supply AGND Analog ground DGND Digital ground MIXVCC Power supply mixer LNAGND High-frequency ground LNA and mixer LNA_IN RF input n.c. Not connected LFVCC Power supply VCO LF Loop filter LFGND Ground VCO XTO Crystal oscillator DVCC Digital power supply MODE Selecting 433.92 MHz /315 MHz Low: 4.90625 MHz (USA) High: 6.76438 (Europe) POUT Programmable output port TEST Test pin, during operation at GND ENABLE Enables the polling mode Low: polling mode off (sleep mode) H: polling mode on (active mode) DATA Data output / configuration input 2 (25) Rev. A1, 15-Oct-98 Preliminary Information U3741BM Block Diagram VS FSK/ASK CDEM AVCC SENS IF Amp Sensitivity reduction Polling circuit and control logic FSK/ASK– Demodulator and data filter RSSI DEMOD_OUT 50 kW DATA Limiter out ENABLE TEST POUT MODE FE CLK DVCC www.DataSheet4U.com AGND DGND 4. Order MIXVCC LPF 3 MHz Standby logic LFGND LNAGND IF Amp LFVCC LPF 3 MHz VCO XTO XTO f LNA_IN LNA 64 15011 LF Figure 3. Block diagram RF Front End The RF front end of the receiver is a heterodyne configuration that converts ...

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