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PDF EVB71101 Data sheet ( Hoja de datos )
| Número de pieza | EVB71101 | |
| Descripción | 315/433MHz Receiver Evaluation Board Description | |
| Fabricantes | Melexis Microelectronic Systems | |
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EVB71101
315/433MHz Receiver
Evaluation Board Description
Features
! Single-conversion superhet architecture for low external component count
! FSK for digital data and FM reception for analog signal transmission
! FSK/FM demodulation with phase-coincidence demodulator
! Low current consumption in active mode and very low standby current
! Switchable LNA gain for improved dynamic range
! RSSI allows signal strength indication and ASK detection
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Ordering Information
Part No.
EVB71101-433-FSK-C
EVB71101-433-ASK-C
EVB71101-315-FSK-C
EVB71101-315-ASK-C
Application Examples
! General digital data transmission
! Tire Pressure Monitoring Systems (TPMS)
! Remote Keyless Entry (RKE)
! Wireless access control
! Alarm and security systems
! Garage door openers
! Remote Controls
" Home and building automation
! Low-power telemetry systems
Evaluation Board
General Description
The TH71101 FSK/FM/ASK single-conversion superheterodyne receiver IC is designed for applications in
the European 433 MHz industrial-scientific-medical (ISM) band, according to the EN 300 220
telecommunications standard. It can also be used for any other system with carrier frequencies ranging from
300 MHz to 450 MHz (e.g. for applications to FCC part 15 and ARIB STD-T67).
39012 71101 01
Rev. 011
Page 1 of 14
EVB Description
June/07
1 page  
EVB71101
315/433MHz Receiver
Evaluation Board Description
By using the internal PLL synthesizer of the TH71101 with the fixed feedback divider ratio of N = 16
(DIV_16), two types of down-conversion are possible: low-side injection of LO and high-side injection of LO.
The following table summarizes some equations that are useful to calculate the crystal reference frequency
(REF) and the LO frequency, for a given RF and IF.
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Injection type
REF
LO
IF
RF image
low
(RF – IF)/16
16 • REF
RF – LO
RF – 2IF
high
(RF + IF)/16
16 • REF
LO – RF
RF + 2IF
1.6.1 Selected Frequency Plans
The following table depicts crystal, LO and image signals considering the examples of 315 MHz and
433.92 MHz RF reception at IF = 10.7 MHz.
Signal type
Injection type
REF / MHz
LO / MHz
RF image / MHz
RF = 315 MHz
low
19.01875
304.3
293.6
RF = 315 MHz
high
20.35625
325.7
336.4
RF = 433.92 MHz
low
26.45125
423.22
412.52
RF = 433.92 MHz
high
27.78875
444.62
455.32
The selection of the reference crystal frequency is based on some assumptions. As for example: the image
frequency should not be in a radio band where strong interfering signals might occur (because they could
represent parasitic receiving signals), the LO signal should be in the range of 300 MHz to 450 MHz (because
this is the optimum frequency range of the VCO1). Furthermore the IF should be as high as possible to
achieve highest RF image rejection. The columns in bold depict the selected frequency plans to receive at
315 MHz and 433.92 MHz, respectively.
1.6.2 Maximum Frequency Coverage
Parameter
Injection type
RF / MHz
REF / MHz
LO / MHz
IF/ MHz
fmin
high
289.3
18.75
300
10.7
fmax
low
460.7
28.125
450
10.7
39012 71101 01
Rev. 011
Page 5 of 14
EVB Description
June/07
5 Page 
EVB71101
315/433MHz Receiver
Evaluation Board Description
2.2.3 Component Arrangement Top Side for ASK Reception
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Board size is 42.7mm x 37.5mm
Melexis
11
C16
RF_input
XTAL
C17
R1
L1
IN_LNA
EVB711XX_4
0Ω
CB3
24 17
25 16
CB2
TH71101
L2
32
1
CB1
C7
L3
C6
CB8
89
CB5
C10
VCC
39012 71101 01
Rev. 011
Page 11 of 14
EVB Description
June/07
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet EVB71101.PDF ] | |
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