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參數(shù)資料
| 型號： | T5743 |
| 廠商： | Atmel Corp. |
| 英文描述： | UHF ASK/FSK Receiver |
| 中文描述： | 超高頻ASK / FSK接收器 |
| 文件頁數(shù)： | 5/41頁 |
| 文件大?。?/td> | 681K |
| 代理商： | T5743 |
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5
T5743
4569A–RKE–12/02
This is described by the following formulas:
The relation is designed to achieve the nominal IF frequency of f
IF
= 1 MHz for most
applications. For applications where f
RF
= 315 MHz, MODE must be set to ‘0’. In the
case of f
RF
= 433.92 MHz, MODE must be set to ‘1’. For other RF frequencies, f
IF
is
not equal to 1 MHz. f
IF
is then dependent on the logical level at Pin MODE and on f
RF
.
Table 1 summarizes the different conditions.
The RF input either from an antenna or from a generator must be transformed to the RF
input Pin LNA_IN. The input impedance of that pin is provided in the electrical parame-
ters. The parasitic board inductances and capacitances also influence the input
matching. The RF receiver T5743 exhibits its highest sensitivity at the best signal-to-
noise ratio in the LNA. Hence, noise matching is the best choice for designing the trans-
formation network.
A good practice when designing the network is to start with power matching. From that
starting point, the values of the components can be varied to some extent to achieve the
best sensitivity.
If a SAW is implemented into the input network a mirror frequency suppression of
P
Ref
= 40 dB can be achieved. There are SAWs available that exhibit a notch at
f = 2 MHz. These SAWs work best for an intermediate frequency of f
IF
= 1 MHz. The
selectivity of the receiver is also improved by using a SAW. In typical automotive appli-
cations, a SAW is used.
Figure 5 shows a typical input matching network, for f
RF
= 315 MHz and f
RF
=
433.92 MHz using a SAW. Figure 6 illustrates an according input matching to 50
without a SAW. The input matching networks shown in Figure 6 are the reference net-
works for the parameters given in the electrical characteristics.
Table 1.
Calculation of LO and IF Frequency
Conditions
f
RF
= 315 MHz, MODE = 0
f
RF
= 433.92 MHz, MODE = 1
300 MHz < f
RF
< 365 MHz,
MODE = 0
Local Oscillator Frequency
f
LO
= 314 MHz
f
LO
= 432.92 MHz
Intermediate Frequency
f
IF
= 1 MHz
f
IF
= 1 MHz
365 MHz < f
RF
< 450 MHz,
MODE = 1
MODE
0 (USA) : f
IF
f
314
---------
=
=
MODE
1 (Europe) : f
IF
f
-----------------
=
=
f
LO
f
1
---------
+
-------------------
=
f
IF
f
---------
=
f
LO
f
1
-----------------
+
---------------------------
=
f
IF
f
-----------------
=
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| T5743P3-TGS | 功能描述:IC RCVR ASK/FSK 300MHZ 20-SOIC RoHS:否 類別:RF/IF 和 RFID >> RF 接收器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 09/Jan/2012 標準包裝:50 系列:* 頻率:850MHz ~ 2.175GHz 靈敏度:- 數(shù)據(jù)傳輸率 - 最大:- 調(diào)制或協(xié)議:- 應(yīng)用:* 電流 - 接收:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 特點:- 電源電壓:4.75 V ~ 5.25 V 工作溫度:0°C ~ 85°C 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| T5743P6-TG | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:UHF ASK/FSK Receiver |
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