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參數(shù)資料
| 型號： | TH71102 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | FSK/FM/ASK Receiver |
| 中文描述： | FSK信號/調(diào)頻/ ASK接收機(jī) |
| 文件頁數(shù)： | 4/20頁 |
| 文件大小： | 666K |
| 代理商： | TH71102 |
TH71102
315/433MHz
FSK/FM/ASK Receiver
TH71102 Data Sheet
3901071102
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 LO1 signal (which
is now the one and only LO signal in the receiver).
The receiver’s double-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 are the image of the RF signal (that must be suppressed by the RF front-end filter), spurious
signals injected to the first IF (IF1) and their images which could be mixed down to the same second IF (IF2)
as the desired RF signal (they must be suppressed by the LC filter at IF1 and/or by low-crosstalk design).
By configuring the TH71102 for double conversion and using its internal PLL synthesizer with fixed feedback
divider ratios of N1 = 8 (DIV_8) and N2 = 2 (DIV_2), four types of down-conversion are possible: low-side
injection of LO1 and LO2 (
low-low
), LO1 low-side and LO2 high-side (
low-high
), LO1 high-side and LO2
low-side (
high-low
) or LO1 and LO2 high-side (
high-high
). The following table summarizes some equations
that are useful to calculate the crystal reference frequency (REF), the first IF (IF1) and the VCO1 or first LO
frequency (LO1), respectively, for a given RF and second IF (IF2).
Injection type
REF
LO1
high-high
(RF – IF2)/14
16
REF
LO1 – RF
2
REF
LO2 – IF1
low-low
(RF – IF2)/18
16
REF
RF – LO1
2
REF
IF1 – LO2
high-low
(RF + IF2)/14
16
REF
LO1 – RF
2
REF
IF1 – LO2
low-high
(RF + IF2)/18
16
REF
RF – LO1
2
REF
LO2 – IF1
IF1
LO2
IF2
The following table depicts generated, desired, possible images and some undesired signals considering the
examples of 315 MHz and 433.6 MHz RF reception at IF2 = 10.7 MHz.
Signal type
RF = 315
MHz
RF = 315
MHz
RF = 315
MHz
RF = 315
MHz
RF =
433.6 MHz
RF =
433.6 MHz
RF =
433.6 MHz
RF =
433.6 MHz
Injection type
high-high
low-low
high-low
low-high
high-high
low-low
high-low
low-high
REF / MHz
21.73571
16.90556
23.26429
18.09444
30.20714
23.49444
31.73571
24.68333
LO1 / MHz
347.77143
270.48889
372.22857
289.51111
483.31429
375.91111
507.77143
394.93333
IF1 / MHz
32.77143
44.51111
57.22857
25.48889
49.71429
57.68889
74.17143
38.66667
LO2 / MHz
43.47143
33.81111
46.52857
36.18889
60.41429
46.98889
63.47143
49.36667
RF image/MHz
380.54286
225.97778
429.45714
264.02222
533.02857
318.22222
581.94286
356.26667
IF1 image/MHz
54.17143
23.11111
35.82857
46.88889
71.11429
36.28889
52.77143
60.06667
The selection of the reference crystal frequency is based on some assumptions. As for example: the first IF
and the image frequencies should not be in a radio band where strong interfering signals might occur
(because they could represent parasitic receiving signals), the LO1 signal should be in the range of 300 MHz
to 430 MHz (because this is the optimum frequency range of the VCO1). Furthermore the first 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 |
|---|---|
| TH71102.2ENE-TR | 制造商:Melexis Semiconductors 功能描述:TH71102 Series 2.3 - 5.5 V 315 / 433 MHz FSK/FM/ASK Receiver - LQFP 制造商:Melexis Semiconductors 功能描述:TH71102 Series 260 kbps 8.2 mA SMT 315/433 MHz FSK/ASK Receiver - LQFP-32 |
| TH71102ENE | 制造商:MELEXIS 制造商全稱:Melexis Microelectronic Systems 功能描述:315/433MHz FSK/FM/ASK Receiver |
| TH71102ENE-BAA-000-RE | 功能描述:IC RECEIVER SGL CONV 32-LQFP RoHS:是 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 |
| TH71102ENE-BAA-000-TR | 制造商:Melexis Semiconductors 功能描述:IC RECEIVER FSK/FM/ASK 32LQFP 制造商:Melexis Semiconductors 功能描述:TH71102 Series 260 kbps 8.2 mA SMT 315/433 MHz FSK/ASK Receiver - LQFP-32 |
| TH7111 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FSK /FM/ASK Receiver |
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