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参数资料
| 型号： | EVB71101B-433-FSK-C |
| 厂商： | Melexis Technologies NV |
| 文件页数： | 5/14页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD TH71101 RECEIVR |
| 标准包装： | 1 |
| 类型： | 接收器，ASK/FSK |
| 频率： | 433MHz |
| 适用于相关产品： | TH71101 |
| 已供物品： | 板 |
| 其它名称： | EVB71101-433-FSK EVB71101-433-FSK-ND EVB71101-433.92F EVB71101-433.92F-ND EVB71101B-433FSKC |
EVB71101
315/433MHz Receiver
Evaluation Board Description
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 following table summarizes some equations that are useful to calculate the crystal reference frequency
(REF) and the LO frequency, for a given RF and IF.
1.6.1
Injection type
REF
LO
IF
RF image
Selected Frequency Plans
low
(RF – IF)/16
16 ? REF
RF – LO
RF – 2IF
high
(RF + IF)/16
16 ? REF
LO – RF
RF + 2IF
The following table depicts crystal, LO and image signals considering the examples of 315 MHz and
433.92 MHz RF reception at IF = 10.7 MHz.
Signal type
Injection type
REF / MHz
LO / MHz
RF image / MHz
RF = 315 MHz
low
19.01875
304.3
293.6
RF = 315 MHz
high
20.35625
325.7
336.4
RF = 433.92 MHz
low
26.45125
423.22
412.52
RF = 433.92 MHz
high
27.78875
444.62
455.32
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 450 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 433.92 MHz, respectively.
1.6.2
Maximum Frequency Coverage
Parameter
Injection type
RF / MHz
REF / MHz
LO / MHz
IF/ MHz
39012 71101 01
Rev. 012
f min
high
289.3
18.75
300
10.7
Page 5 of 14
f max
low
460.7
28.125
450
10.7
EVB Description
April/08
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| EVB71102B-315-FSK-C | EVALUATION BOARD TH71102 RECEIVR |
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| EVB71112B-915-FSK-C | EVALUATION BOARD TH71112 RECEIVR |
| EVB7122-433-FSK-C | BOARD EVAL FOR TH7122 433MHZ |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVB71102 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:EVB71102 EValuation Board for TH71102 Receiver |
| EVB71102-315-ASK-A | 制造商:MELEXIS 制造商全称:Melexis Microelectronic Systems 功能描述:315/433MHz Receiver Evaluation Board Description |
| EVB71102-315-ASK-C | 制造商:MELEXIS 制造商全称:Melexis Microelectronic Systems 功能描述:315/433MHz Receiver Evaluation Board Description |
| EVB71102-315-FM-A | 制造商:MELEXIS 制造商全称:Melexis Microelectronic Systems 功能描述:315/433MHz Receiver Evaluation Board Description |
| EVB71102-315-FM-C | 制造商:MELEXIS 制造商全称:Melexis Microelectronic Systems 功能描述:315/433MHz Receiver Evaluation Board Description |
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