ATA3741P2-TGQY Atmel, ATA3741P2-TGQY Datasheet
ATA3741P2-TGQY
Specifications of ATA3741P2-TGQY
Available stocks
Related parts for ATA3741P2-TGQY
ATA3741P2-TGQY Summary of contents
Page 1
... 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 Atmel's PLL RF transmitter U2741B. Its main applications are in the areas of telemetering, security technology, and keyless-entry systems ...
Page 2
Figure 1-1. System Block Diagram Remote control transmitter 1 Li cell Encoder ATARx9x Keys Figure 1-2. Block Diagram FSK/ASK CDEM AVCC SENS AGND DGND MIXVCC LNAGND LNA_IN ATA3741 2 UHF ASK/FSK U2741B PLL Antenna Antenna XTO VCO Power amp. FSK/ASK ...
Page 3
Pin Configuration Figure 2-1. Table 2-1. Pin Description Pin Symbol Function 1 SENS Sensitivity-control resistor 2 FSK/ASK Selecting FSK/ASK. Low: FSK, High: ASK 3 CDEM Lower cut-off frequency data filter 4 AVCC Analog power supply 5 AGND Analog ground ...
Page 4
RF Front End The RF front end of the receiver is a heterodyne configuration that converts the input signal into a 1-MHz IF signal. As seen in the block diagram, the front end consists of an LNA (low noise ...
Page 5
RF input frequency f LO mula determine f frequency tuned by the crystal frequency f f that depends on the logic level at pin mode. This is ...
Page 6
Figure 3-2. Input Matching Network With SAW Filter C3 L 25n 22p f = 433.92 MHz RF L2 TOKO LL2012 RF F33NJ 33n 2 IN_GND C2 8.2 pF Figure 3-3. Input Matching Network Without SAW Filter f ...
Page 7
... The ATA3741 is available with 2 different IF bandwidths. ATA3741-M2, the version with B = 300 kHz, is well suited for ASK systems where Atmel’s PLL transmitter U2741B is used. IF The receiver ATA3741-M3 employs an IF bandwidth of B together with the U2741B in FSK and ASK mode. If used in ASK applications, it allows higher tolerances for the receiver and PLL transmitter crystals ...
Page 8
FSK/ASK Demodulator and Data Filter The signal coming from the RSSI amplifier is converted into the raw data signal by the ASK/FSK demodulator. The operating mode of the demodulator is set via pin ASK/FSK. Logic “L” sets the demodulator ...
Page 9
When designing the system in terms of receiving bandwidth, the LO deviation must be consid- ered as it also determines the IF center frequency. The total LO deviation is calculated to be the sum of the deviation of the crystal ...
Page 10
Figure 5-1. Pin MODE can now be set in accordance with the desired clock cycle T lowing application-relevant parameters: • Timing of the polling circuit including bit check • Timing of analog and digital signal processing • Timing of register ...
Page 11
Polling Mode As shown in three different modes. In sleep mode, the signal processing circuitry is disabled for the time period T nal processing circuits are enabled and settled. In the following bit-check mode, the incoming data stream is ...
Page 12
Figure 5-2. Polling Mode Flow Chart Sleep Mode: All circuits for signal processing are disabled. Only XTO and polling logic is enabled. Output level on pin IC_ACTIVE => low SON T = Sleep Sleep Start-up Mode: ...
Page 13
Bit-check Mode In bit-check mode, the incoming data stream is examined to distinguish between a valid signal from a corresponding transmitter and signals due to noise. This is done by subsequent time frame checks where the distances between 2 ...
Page 14
Figure Lim_min = 14 and Lim_max = 24. When the IC is enabled, the signal processing circuits are enabled during T that period. When the bit check becomes active, the bit-check counter is clocked with the cycle T . XClk ...
Page 15
Duration of the Bit Check If no transmitter signal is present during the bit check, the output of the ASK/FSK demodulator delivers random signals. The bit check is a statistical process and T Therefore, an average value for T ...
Page 16
Figure 5-9. Debouncing of the Demodulator Output Dem_out DATA Lim_min Figure 5-10. Steady L State Limited DATA Output Pattern after Transmission Enable IC Bit check Dem_out DATA Sleep mode After the end of a data transmission, the receiver remains active ...
Page 17
Figure 5-11. Timing Diagram of the OFF Command Via Pin DATA Out1 (microcontroller) X DATA (U3741BM) Serial bi-directional X data line Receiver on Figure 5-12. Timing Diagram of the OFF Command Via Pin ENABLE ENABLE DATA (U3741BM) X Serial bi-directional ...
Page 18
Table 5-3 The default configuration is labeled for each word. BR_Range sets the appropriate baud rate range. At the same time, it defines XLim. XLim is used to define the bit check limits T POUT can be used to control ...
Page 19
Table 5-5. Effect of the Configuration Bit VPOUT VPOUT POUT 0 1 Table 5-6. Effect of the Configuration Word Sleep Sleep Sleep4 Sleep3 Sleep2 ...
Page 20
Table 5-8. Effect of the Configuration Word Lim_min Lim_min Lim_min < not applicable ...
Page 21
To indicate that condition, the receiver displays a reset marker (RM) at pin DATA after a reset. The RM is represented by the fixed frequency f an “L” pulse t1 at pin DATA. The RM implies the following characteristics: • ...
Page 22
Figure 5-15. One-wire Connection to a Microcontroller To start programming, the serial data line DATA is pulled to “L” by the microcontroller for the time period t1. When DATA has been released, the receiver becomes the master device. When the ...
Page 23
Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated ...
Page 24
Electrical Characteristics (Continued) All parameters refer to GND –40°C to +105°C, V amb ( 25°C) S amb Parameter Test Condition Symbol Receiving Mode Intermediate MODE=0 (USA frequency MODE=1 (Europe) BR_Range0 Baud ...
Page 25
Electrical Characteristics (Continued) All parameters refer to GND –40°C to +105°C, V amb ( 25°C) S amb Parameter Test Condition Symbol Time frame of a bit t6 (Figure 5-14) Programming pulse t7 (Figure ...
Page 26
Electrical Characteristics (Continued) All parameters refer to GND –40°C to +105°C, V amb ( 25°C) S amb Parameters Local Oscillator Operating frequency range VCO Phase noise VCO/LO Spurious of the VCO VCO gain ...
Page 27
Electrical Characteristics (Continued) All parameters refer to GND –40°C to +105°C, V amb ( 25°C) S amb Parameters Input sensitivity ASK 600-kHz IF filter BR_Range0 Input sensitivity ASK 600-kHz IF filter BR_Range1 Input ...
Page 28
Electrical Characteristics (Continued) All parameters refer to GND –40°C to +105°C, V amb ( 25°C) S amb Parameters Lower cut-off frequency of the data filter Recommended CDEM for best performance Recommended CDEM for ...
Page 29
Electrical Characteristics (Continued) All parameters refer to GND –40°C to +105°C, V amb ( 25°C) S amb Parameters Reduced sensitivity variation for different values of R Sense Threshold voltage for reset Digital Ports ...
Page 30
... Ordering Information Extended Type Number ATA3741P2-TGSY ATA3741P2-TGQY ATA3741P3-TGSY ATA3741P3-TGQY 11. Package Information Package SO20 Dimensions in mm 0.4 1. 12. Revision History Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. 4899B-RKE-10/06 ATA3741 ...
Page 31
... Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL’S TERMS AND CONDI- TIONS OF SALE LOCATED ON ATMEL’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ...