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PDF T5744 Data sheet ( Hoja de datos )
| Número de pieza | T5744 | |
| 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 4.5 V to 5.5 V, 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 Biphase)
• 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
T5744
Description
The T5744 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, Biphase and most PWM protocols. Its main applications are in the areas
of telemetering, security technology and keyless-entry systems.
www.DataSheet4U.com
Figure 1. System Block Diagram
1 Li cell
Encoder
Keys M44Cx9x
UHF ASK/FSK
Remote control transmitter
U2741B
T5744
XTO
PLL
VCO
Antenna Antenna
UHF ASK
Remote control receiver
Demod.
Data
interface
IF Amp
PLL
XTO
1...3
µC
Power
amp.
LNA VCO
Rev. 4521B–RKE–01/03
1
1 page  
T5744
Figure 5 shows a typical input matching network for fRF = 315 MHz and fRF =
433.92 MHz using a SAW. Figure 6 illustrates the input matching to 50 W without a
SAW. The input matching networks shown in Figure 6 are the reference networks for the
parameters given in the electrical characteristics.
Table 1. Calculation of LO and IF Frequency
Conditions
fRF = 315 MHz, MODE = 0
fRF = 433.92 MHz, MODE = 1
Local Oscillator Frequency
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 5. Input Matching Network with SAW Filter
8 LNAGND
T5744
C3
L
9
LNA_IN
22p 25n
fRF = 433.92 MHz
C16 C17
100p
L3
27n
8.2p
TOKO LL2012
F27NJ
RFIN
L2
TOKO LL2012
F33NJ
1 IN
B3555
OUT
C2 33n 2 IN_GND
OUT_GND
CASE_GND
8.2p 3,4 7,8
5
6
8 LNAGND
T5744
C3
L
9
LNA_IN
47p 25n
fRF = 315 MHz
C16 C17
100p
L3
47n
22p
TOKO LL2012
F47NJ
L2
RFIN
TOKO LL2012
F82NJ
1 IN
B3551
5
OUT
C2 82n 2 IN_GND
OUT_GND 6
CASE_GND
10p 3,4 7,8
4521B–RKE–01/03
5
5 Page 
Figure 12. Synchronization of the Demodulator Output
TXClk
T5744
Dem_out
Data_out (DATA)
tee_sig
Figure 13. Debouncing of the Demodulator Output
Dem_out
DATA
tDATA_min
tee
tDATA_min
tee
tDATA_min
tee
Absolute Maximum Ratings
Parameters
Supply voltage
Power dissipation
Juntion temperature
Storage temperature
Ambient temperature
Maximum input level, input matched to 50 W
Thermal Resistance
Parameters
Junction ambient SO20 package
Junction ambient SSO20 package
Symbol
VS
Ptot
Tj
Tstg
Tamb
Pin_max
Symbol
RthJA
RthJA
Min.
-55
-40
Max.
6
450
150
+125
+105
10
Value
100
100
Unit
V
mW
°C
°C
°C
dBm
Unit
K/W
K/W
4521B–RKE–01/03
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet T5744.PDF ] | |
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