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EVB71101 Datasheet(PDF) 4 Page - Melexis Microelectronic Systems

Part # EVB71101
Description  315/433MHz Receiver Evaluation Board Description
Download  14 Pages
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Manufacturer  MELEXIS [Melexis Microelectronic Systems]
Direct Link  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

EVB71101 Datasheet(HTML) 4 Page - Melexis Microelectronic Systems

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EVB71101
315/433MHz Receiver
Evaluation Board Description
39012 71101 01
Page 4 of 14
EVB Description
Rev. 011
June/07
1.3
Block Diagram
Fig. 1: TH71101 block diagram
1.4
Mode Configurations
ENRX
Mode
Description
0
RX standby
RX disabled
1
RX active
RX enable
Note: ENRX are pulled down internally
1.5
LNA GAIN Control
VGAIN_LNA
Mode
Description
< 0.8 V
HIGH GAIN
LNA set to high gain
> 1.4 V
LOW 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.
MIX1
12
IN_LNA
4
31
8
5
67
11
IF
13
17
27
28
26
IF
10
9
LO
25
BIAS
30
VCO1
PFD
RO
22
RO
LF
29
CP
32
18
19
OAP
OAN
OUT_OA
OA
20
LNA
3
2
1
MIX2
14
15
16
23
24
OUTP
OUTN
MIX3
IFA
21
DIV_16


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