ATA5744

Manufacturer Part NumberATA5744
DescriptionAta5744 Uhf Ask Receiver
ManufacturerATMEL Corporation
ATA5744 datasheet
 
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Features
Minimal External Circuitry Requirements, no RF Components on the PC Board Except
Matching to the Receiver Antenna
High Sensitivity, Especially at Low Data Rates
SSO20 and SO20 package
Fully Integrated VCO
Supply Voltage 4.5V to 5.5V, Operating Temperature Range –40°C to
+105°C
Single-ended RF Input for Easy Adaptation to l/4 Antenna or Printed
Antenna on PCB
Low-cost Solution Due to High Integration Level
Various Types of Protocols Supported (i.e., PWM, Manchester and
Bi-phase)
Distinguishes the Signal Strength of Several Transmitters via RSSI (Received Signal
Strength Indicator)
ESD Protection According to MIL-STD. 883 (4KV HBM)
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
Power Management (Polling) is Possible by Means of a Separate Pin via the
Microcontroller
Receiving Bandwidth BIF = 600 kHz
1. Description
The ATA5744 is a PLL receiver device for the receiving range of f
450 MHz. It is developed for the demands of RF low-cost data communication sys-
tems with low data rates and fits for most types of modulation schemes including
Manchester, Bi-phase and most PWM protocols. Its main applications are in the areas
of telemetering, security technology and keyless-entry systems.
Figure 1-1.
System Block Diagram
UHF ASK/FSK
Remote control transmitter
1 Li cell
U2741B
Encoder
PLL
ATARx9x
Keys
XTO
VCO
Power
amp.
UHF ASK
Remote control receiver
ATA5744
Data
Demod.
interface
IF Amp
Antenna Antenna
PLL
XTO
LNA
VCO
UHF ASK
Receiver
ATA5744
= 300 MHz to
0
1...3
Micro-
controller
Rev. 4893A–RKE–11/05

ATA5744 Summary of contents

  • Page 1

    ... Receiving Bandwidth BIF = 600 kHz 1. Description The ATA5744 is a PLL receiver device for the receiving range of f 450 MHz developed for the demands of RF low-cost data communication sys- tems with low data rates and fits for most types of modulation schemes including Manchester, Bi-phase and most PWM protocols ...

  • Page 2

    ... XTO 15 DVCC 16 MODE 17 RSSI 18 TEST 19 ENABLE 20 DATA ATA5744 2 Function Baud rate select LSB Baud rate select MSB Lower cut-off frequency data filter Analog power supply Analog ground Digital ground Power supply mixer High-frequency ground LNA and mixer RF input Not connected Power supply VCO ...

  • Page 3

    ... Figure 2-2, the front end consists of an LNA (Low-Noise Ampli- for the mixer /64 is equal XTO /64 Figure 3-1, the crystal should be connected to GND via a capacitor CL. The value ATA5744 DATA Data interface TEST Test MODE DVCC ENABLE LFGND Standby logic LFVCC XTO ...

  • Page 4

    ... LNA_IN. The input impedance of that pin is provided in the electrical parameters. The para- sitic board inductances and capacitances also influence the input matching. The RF receiver ATA5744 exhibits its highest sensitivity at the best signal-to-noise ratio in the LNA. Hence, noise matching is the best choice for designing the transformation network. ...

  • Page 5

    ... MHz RF RF are the reference networks for the Intermediate Frequency MHz MHz --------- - IF 314 ----------------- - IF 432.92 ATA5744 8 LNAGND LNA_IN 25n 47p C16 C17 22p 100p L3 TOKO LL2012 47n F47NJ L2 TOKO LL2012 F82NJ B3551 1 OUT IN 82n ...

  • Page 6

    ... 433.92 MHz is used. For other RF input frequencies, refer to RF mine the center frequency. The receiver ATA5744 employs an IF bandwidth of B the U2741B in ASK mode. 4.2 RSSI Amplifier The subsequent RSSI amplifier enhances the output signal of the IF amplifier before it is fed into the demodulator ...

  • Page 7

    ... BR_Range is defined by the pins BR_0 and BR_1. BR_Range must be set in accordance to the used baudrate. 4893A–RKE–11/05 is –100 dBm to –55 dBm. Figure 3-3 and exhibits the best possible sensitivity. RSSI Characteristics 3.0 2.8 2.6 T amb 2.4 25°C 2.2 105°C 2.0 1.8 1.6 1.4 1.2 1.0 -130.0 -110.0 -90.0 1 ---------------------------------------------------- - 2 R CDEM 1 ATA5744 max. = 40°C min. -70.0 -50.0 -30.0 P (dBm) Ref 7 ...

  • Page 8

    ... Receiving Characteristics The RF receiver ATA5744 can be operated with and without a SAW front-end filter typical automotive application, a SAW filter is used to achieve better selectivity. The selectivity with and without a SAW front-end filter is illustrated in quency is reduced by 40 dB. The plots are printed relatively to the maximum sensitivity SAW filter is used, an insertion loss of about 4 dB must be considered ...

  • Page 9

    ... MODE. The electrical characteristic XTO ). Clk XClk Clk BR_Range1 XClk Clk BR_Range2 XClk Clk BR_Range3 XClk Clk ATA5744 ) is defined by XTO L : USA(:10) H: Europe(:14 controls the fol- Clk Clk = 315 MHz is mainly Send -dependent Clk is defined by the following XClk ). LO 9 ...

  • Page 10

    ... During start-up and receiving mode, the current consumption is I Figure 5-1. Enable Timing (1) Dem_out ENABLE DATA Sleep mode Soff Figure 5-2. Enable Timing (2) Dem_out ENABLE DATA Sleep mode Soff ATA5744 10 Start-up mode Receiving mode Son T Start-up Start-up mode Receiving mode Son T Start-up Figure 5-1 and Fig ...

  • Page 11

    ... Dem_out Data_out (DATA) Figure 6-2. Debouncing of the Demodulator Output Dem_out DATA t DATA_min 4893A–RKE–11/05 Figure 6-1 on page 11 illustrates how Dem_out is synchronized by the . Data can change its state only after T XClk t ee_sig t DATA_min ATA5744 has elapsed. The XClk T . DATA_min t DATA_min ...

  • Page 12

    ... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Supply voltage Power dissipation Junction temperature Storage temperature Ambient temperature Maximum input level, input matched Thermal Resistance Parameters Junction ambient SO20 package Junction ambient SSO20 package ATA5744 12 Symbol Min tot –55 ...

  • Page 13

    ... Symbol IS off IS on IIP3 6, required IS LORF NF Zi LNA_IN ATA5744 = 315 MHz, unless otherwise specified. 0 (MODE:0) Variable Oscillator Typ. Max. Min. Typ. 2.0383 1/(f /10) 1/(f xto 1/(f /14) 1/(f xto 16 Clk 8 Clk 4 Clk 2 ...

  • Page 14

    ... BR_Range0 (1 kBd) BR_Range1 (2 kBd) BR_Range2 (4kBd) BR_Range3 (8 kBd) Sensitivity variation for the f = 433.92 MHz/315 MHz in full operating range MHz IF compared ASK ° amb S ATA5744 14 Symbol 6, referred to IP 1db P -3 in_max 6, BER 10 f VCO L (fm) K VCO B Loop C LF_tot f XTO R S ...

  • Page 15

    ... Symbol P Ref + P Ref_ASK Ref SNR R RSSI V RSSI G RSSI 1 = ----------------------------------------------------- CDEM CDEM Pup ATA5744 Min. Typ. Max. +5.5 –1.5 +7.5 –1 1.0 3.0 20 mV/ 6.8 1.75 2.2 2.65 3.5 4.4 5.3 7.0 8.8 10.6 14.0 17.6 21.2 0. ...

  • Page 16

    ... XTO MIXVCC LNAGND LFGND 9 LNA_IN LFVCC C12 150 pF C15 10 nF 10% 10% np0 C16 100 pF 5% np0 315 MHz, without SAW Filter ATA5744 1 BR_0 DATA 2 C14 BR_1 ENABLE 3 CDEM TEST RSSI 4 MODE AVCC AGND 6 DVCC 10% DGND 7 XTO ...

  • Page 17

    ... C16 C17 10% 10% np0 100 np0 np0 5% B3551 OUT 2 6 IN_GND OUT_GND 3 7 CASE_GND CASE_GND 4 8 ATA5744 20 DATA 19 ENABLE 18 17 RSSI 16 6.76438 15 MHz C11 np0 150 pF np0 10% 820 C10 4 ...

  • Page 18

    ... Ordering Information Extended Type Number ATA5744N-TKSY ATA5744N-TKQY ATA5744N-TGSY ATA5744N-TGQY 12. Package Information Package SO20 Dimensions in mm 0.4 1. ATA5744 18 Package Remarks SSO20 Tube, Pb-free SSO20 Taped and reeled, Pb-free SO20 Tube, Pb-free SO20 Taped and reeled, Pb-free 12.95 12.70 2.35 0.25 0.10 11.43 11 technical drawings according to DIN specifications 10 9.15 8.65 7.5 7.3 0.25 10.50 10.20 4893A–RKE–11/05 ...

  • Page 19

    ... Package SSO20 Dimensions in mm 0.25 0. 4893A–RKE–11/05 6.75 6.50 1.30 0.15 0.05 5.85 11 technical drawings according to DIN specifications 10 ATA5744 5.7 5.3 4.5 4.3 0.15 6.6 6.3 19 ...

  • Page 20

    ... Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. © Atmel Corporation 2005. All rights reserved. Atmel marks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. Atmel Operations Memory ...