MLX71120KLQ Melexis Inc, MLX71120KLQ Datasheet - Page 10
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MLX71120KLQ
Manufacturer Part Number
MLX71120KLQ
Description
RCVR FSK/FM/ASK 32-QFN
Manufacturer
Melexis Inc
Datasheet
1.MLX71120KLQ.pdf
(30 pages)
Specifications of MLX71120KLQ
Frequency
300MHz ~ 930MHz
Sensitivity
-108dBm
Data Rate - Maximum
100 kbps
Modulation Or Protocol
ASK, FM, FSK
Applications
General Remote Control, Garage Opener, RKE
Current - Receiving
8.1mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Features
RSSI Equipped
Voltage - Supply
2.1 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Package / Case
32-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Memory Size
-
Other names
MLX71120A
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MLX71120KLQ-AAA-000-RE
Manufacturer:
MELEXIS
Quantity:
3 000
Part Number:
MLX71120KLQ-AAA-000-RE
Manufacturer:
MELEXIS/迈来芯
Quantity:
20 000
Company:
Part Number:
MLX71120KLQ-AAA-000-TU
Manufacturer:
MOT
Quantity:
314
1.13 Data Filter
The data filter is formed by the operational amplifier OA1, two internal 100kΩ resistors and two external ca-
pacitors. It is implemented as a 2
higher frequencies and therefore leads to an increased sensitivity.
The filter’s pole locations can be set by the external capacitors CF1 and CF2. The cut-off frequency f
be adjusted according to the transmission data rate R. It should be set to approximately 1.5 times the fast-
est expected data rate. For a Butterworth filter characteristic, the data filter capacitors can be calculated as
follows.
1.14 Data Slicer
The purpose of the data slicer is to convert the filtered data signal into a digital output. It can therefore be
considered as an analog-to-digital converter. This is done by using the operational amplifier OA2 as a com-
parator that compares the data filter output with a threshold voltage. The threshold voltage can be derived in
two different ways from the data signal.
39010 71120
Rev. 006
R
RZ
[kbit/s]
0.6
1.2
1.6
2.4
3.3
4.8
6.0
SLCSEL
0
1
CF1
=
100k
CF1
DF1
R
NRZ
2
⋅
1.2
2.4
3.2
4.8
6.6
9.6
12
[kbit/s]
π
100k
nd
⋅
1
100k
order Sallen-Key filter. The low pass filter characteristic rejects noise at
DF2
OA1
CF2
⋅
f
data filter
c
Page 10 of 30
fc [kHz]
DF0
0.9
1.8
2.4
3.6
7.2
5
9
Averaging detection mode
Peak detection mode
Fig. 5:
Description
CF2 =
CF1 [pF]
Data filter
2200
1200
1000
680
470
330
220
CF1
FSK/FM/ASK Receiver
2
MLX71120
300 to 930MHz
CF2 [pF]
1000
680
470
330
220
150
100
Data Sheet
c
Jun/08
has to