參數(shù)資料
型號(hào)： TH71101
廠商： Electronic Theatre Controls, Inc.
英文描述： FSK/FM/ASK Receiver
中文描述： FSK信號(hào)/調(diào)頻/ ASK接收機(jī)
文件頁(yè)數(shù)： 4/20頁(yè)
文件大?。?/td> 656K
代理商： TH71101
TH71101
315/433MHz
FSK/FM/ASK Receiver
TH71101 Data Sheet
3901071101
Page 4 of 20
Nov. 2001
Rev. 005
Frequenc y Planning
Frequency planning is straightforward for single-conversion applications because there is only one IF that
might be chosen, and then the only possible choice is low-side or high-side injection of the LO signal (which
is now the one and only LO signal in the receiver).
The receiver’s single-conversion architecture requires careful frequency planning. Besides the desired RF
input signal, there are a number of spurious signals that may cause an undesired response at the output.
Among them is the image of the RF signal that must be suppressed by the RF front-end filter.
By using the internal PLL synthesizer of the TH71101 with the fixed feedback divider ratio of N = 16 (DIV_16),
two types of down-conversion are possible: low-side injection of LO and high-side injection of LO. The fol-
lowing table summarizes some equations that are useful to calculate the crystal reference frequency (REF),
the IF and the LO frequency respectively, for a given RF.
Injection type
low
high
REF
LO
(RF – IF)/16
16
REF
RF – LO
RF – 2IF
(RF + IF)/16
16
REF
LO – RF
RF + 2IF
IF
RF image
The following table depicts crystal, LO and image signals considering the examples of 315 MHz and
433.6 MHz RF reception at IF = 10.7 MHz.
Signal type
RF = 315 MHz
RF = 315 MHz
RF = 433.6 MHz
RF = 433.6 MHz
Injection type
low
high
low
high
REF / MHz
19.01875
20.35625
325.7
336.4
26.43125
422.9
412.2
27.76875
LO / MHz
304.3
444.3
RF image / MHz
293.6
455.0
The selection of the reference crystal frequency is based on some assumptions. As for example: the image
frequency should not be in a radio band where strong interfering signals might occur (because they could
represent parasitic receiving signals), the LO signal should be in the range of 300 MHz to 430 MHz (because
this is the optimum frequency range of the VCO1). Furthermore the IF should be as high as possible to
achieve highest RF image rejection. The columns in bold depict the selected frequency plans to receive at
315 MHz and 433.6 MHz, respectively.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TH71101.3ENE-TR 制造商:Melexis Semiconductors 功能描述:TH71101 Series 260 kbps 8.2 mA SMT 315/433 MHz FSK/ASK Receiver - LQFP-32
TH71101ENE 制造商:MELEXIS 制造商全稱:Melexis Microelectronic Systems 功能描述:315/433MHz FSK/FM/ASK Receiver
TH71101ENE-CAA-000-RE 制造商:Melexis Semiconductors 功能描述:IC RECEIVER FSK/FM/ASK 32LQFP 制造商:Melexis Semiconductors 功能描述:TH71101 Series 260 kbps 8.2 mA SMT 315/433 MHz FSK/ASK Receiver - LQFP-32
TH71101ENE-CAA-000-TR 功能描述:IC RECEIVER 315/433MHZ 32-LQFP 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(biāo)準(zhǔn)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(chǔ)容量:- 天線連接器:PCB，表面貼裝 特點(diǎn):- 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
TH71102 制造商:MELEXIS 制造商全稱:Melexis Microelectronic Systems 功能描述:315/433MHz FSK/FM/ASK Receiver
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