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TH71112
868/915MHz
FSK/ASK Receiver
1.3
Block Diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
21
14
15
16
IN_LNA
31
LNA
MIX1
IF1
MIX2
IF2
IFA
MIX3
OUTP
23
OUTN
24
LO1
LO2
OAP
OA
20
OAN
19
DIV16
DIV2
PFD
OUT_OA
VCO1
CP
RO
BIAS
18
32
30
29 LF
26 RO
25
27
28
22
17
Fig. 1: TH71112 block diagram
1.4
Mode Configurations
ENRX
0
1
Mode
RX standby
RX active
Description
RX disabled
RX enable
Note: ENRX are pulled down internally
1.5
LNA GAIN Control
V GAIN_LNA
< 0.8 V
> 1.4 V
Mode
HIGH GAIN
LOW GAIN
Description
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 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).
39010 71112
Rev. 016
Page 4 of 20
Data Sheet
Jun/12
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