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EVB71111-915-FM-C 参数 Datasheet PDF下载

EVB71111-915-FM-C图片预览
型号: EVB71111-915-FM-C
PDF下载: 下载PDF文件 查看货源
内容描述: 868 / 915MHz的接收器评估板说明 [868/915MHz Receiver Evaluation Board Description]
分类和应用:
文件页数/大小: 14 页 / 614 K
品牌: MELEXIS [ Melexis Microelectronic Systems ]
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EVB71111  
868/915MHz Receiver  
Evaluation Board Description  
1.3 Block Diagram  
1
2
3
4
5
6
7
8
9
10  
11 12  
13  
21  
14  
15  
16  
MIX1  
OUTP  
23  
OUTN  
MIX3  
IN_LNA  
31  
IF  
IF  
LNA  
MIX2  
IFA  
24  
LO  
OAP  
20  
OAN  
19  
OA  
PFD  
DIV_32  
OUT_OA  
RO  
18  
BIAS  
VCO1  
CP  
32  
30  
29 LF  
26 RO  
25  
28  
27  
22  
17  
Fig. 1: TH71111 block diagram  
1.4 Mode Configurations  
ENRX  
Mode  
Description  
RX disabled  
RX enable  
0
1
RX standby  
RX active  
Note: ENRX are pulled down internally  
1.5 LNA GAIN Control  
VGAIN_LNA  
< 0.8 V  
> 1.4 V  
Mode  
Description  
HIGH GAIN  
LOW GAIN  
LNA set to high gain  
LNA set to low gain  
Note: hysteresis between gain modes to ensure stability  
1.6 Frequency Planning  
Frequency planning is straightforward for single-conversion applications because there is only one IF that  
can 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.  
39012 71111 01  
Rev. 011  
Page 4 of 14  
EVB Description  
June/07