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PDF ATA5744 Data sheet ( Hoja de datos )
| Número de pieza | ATA5744 | |
| Descripción | UHF ASK Receiver | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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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
UHF ASK
Receiver
ATA5744
1. Description
www.DataSheet4U.com
The ATA5744 is a PLL receiver device for the receiving range of f0 = 300 MHz to
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
1 Li cell
Encoder
Keys ATARx9x
UHF ASK/FSK
Remote control transmitter
UHF ASK
Remote control receiver
U2741B
ATA5744
Demod.
Data
interface
PLL
XTO
VCO
Antenna Antenna
IF Amp
PLL
XTO
1...3 Micro-
controller
Power
amp.
LNA VCO
Rev. 4893A–RKE–11/05
1 page  
ATA5744
Figure 3-2 shows a typical input matching network for fRF = 315 MHz and fRF = 433.92 MHz
using a SAW. Figure 3-3 on page 6 illustrates the input matching to 50Ω without a SAW. The
input matching networks shown in Figure 3-3 on page 6 are the reference networks for the
parameters given in the electrical characteristics.
Table 3-1. Calculation of LO and IF Frequency
Conditions
Local Oscillator Frequency
fRF = 315 MHz, MODE = 0
fRF = 433.92 MHz, MODE = 1
fLO = 314 MHz
fLO = 432.92 MHz
300 MHz < fRF < 365 MHz, MODE = 0
fLO
=
------f--R----F-------
1 + ----1-----
314
365 MHz < fRF < 450 MHz, MODE = 1
fLO
=
----------f--R----F-----------
1 + --------1---------
432.92
Intermediate Frequency
fIF = 1 MHz
fIF = 1 MHz
fIF
=
-f--L---O---
314
fIF
=
------f-L---O-------
432.92
Figure 3-2. Input Matching Network with SAW Filter
ATA5744
8 LNAGND
C3 L 9 LNA_IN
22p 25n
fRF = 433.92 MHz
C16 C17
100p
L3
27n
8.2p
TOKO LL2012
F27NJ
L2
RFIN
TOKO LL2012
F33NJ
1 IN
B3555
5
OUT
C2 33n 2 IN_GND
OUT_GND 6
CASE_GND
8.2p
3, 4 7, 8
ATA5744
8 LNAGND
C3
L
9
LNA_IN
47p 25n
fRF = 315 MHz
C16 C17
100p
L3
47n
22p
TOKO LL2012
F47NJ
RFIN
L2
TOKO LL2012
F82NJ
1 IN
B3551
OUT 5
C2 82n 2 IN_GND
6
OUT_GND
10p CASE_GND
3, 4 7, 8
4893A–RKE–11/05
5
5 Page 
ATA5744
6. Digital Signal Processing
The data from the ASK demodulator (Dem_out) is digitally processed in different ways and as a
result converted into the output signal DATA. This processing depends on the selected baudrate
range (BR_Range). Figure 6-1 on page 11 illustrates how Dem_out is synchronized by the
extended basic clock cycle TXClk. Data can change its state only after TXClk has elapsed. The
edge-to-edge time period tee_sig of the DATA signal as a result is always an integral multiple of
TXClk.
The minimum time period between two edges of the data signal is limited to tee_sig ≥ TDATA_min.
This implies an efficient suppression of spikes at the DATA output. At the same time it limits the
maximum frequency of edges at DATA. This eases the interrupt handling of a connected
microcontroller.
Figure 6-1. Synchronization of the Demodulator Output
TXClk
Dem_out
Data_out (DATA)
tee_sig
Figure 6-2. Debouncing of the Demodulator Output
Dem_out
DATA
tDATA_min
tee
tDATA_min
tee
tDATA_min
tee
4893A–RKE–11/05
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ATA5744.PDF ] | |
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