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TH71112ENE Datasheet(PDF) 4 Page - Melexis Microelectronic Systems

Part # TH71112ENE
Description  868/915MHz FSK/FM/ASK Receiver
Download  22 Pages
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Manufacturer  MELEXIS [Melexis Microelectronic Systems]
Direct Link  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

TH71112ENE Datasheet(HTML) 4 Page - Melexis Microelectronic Systems

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TH71112
868/915MHz
FSK/FM/ASK Receiver
39010 71112
Page 4 of 22
Data Sheet
Rev. 013
June/07
1.3
Block Diagram
Fig. 1: TH71112 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 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).
MIX2
MIX1
12
IN_LNA
LNA
4
3
31
2
8
5
67
11
IF2
13
17
27
28
26
IF1
10
9
LO2
LO1
25
1
BIAS
30
VCO1
DIV16
DIV2
PFD
RO
22
RO
LF
29
CP
32
18
19
OAP
OAN
OUT_OA
OA
20
14
15
16
23
24
OUTP
OUTN
MIX3
IFA
21


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