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RFM210LW Schematic ( PDF Datasheet ) - HOPERF

Teilenummer RFM210LW
Beschreibung high performance OOK stand-alone RF receiver
Hersteller HOPERF
Logo HOPERF Logo 




Gesamt 17 Seiten
RFM210LW Datasheet, Funktion
Features
Frequency Range: 315 /433.92 MHz
Symbol Rate: 0.1 to 3.4 kbps
Sensitivity: -108dBm at 2.4 kbps, 0.1% BER
Receiver Bandwidth: 200 kHz
Image Rejection Ratio: 25 dB
Large Signal Handling:10 dBm
Supply Voltage: 1.8 to 3.6 V
Low Power Consumption: 3.8 Ma
3.3 mA @ 315 MHz
3.8 mA @ 433.92 MHz
Low Sleep Current
RoHS Compliant
Module Size:32*11*5.0mm
RFM210LW
RFM210LW
Descriptions
The RFM210LW is an ultra low-cost, low power,
high performance OOK stand-alone RF receiver for
315/433.92MHz wireless applications. It is part of
the CMOSTEK NextGenRFTM family, which
includes a complete line of transmitters, receivers
and transceivers. The RFM210LW is a true plug-
and- run device, no register configuration and
manually- tune is required. The RFM210LW
operates from
1.8 V to3.6 V, finely work till the end of most
batteries’ power. It consumes 3.3 mA current while
achieving -109 dBm receiving sensitivity at 315
MHz and consumes 3.8 mA current while
achieving -108 dBm receiving sensitivity at433.92
MHz.
Applications
z Low-Cost Consumer Electronics Applications
z Home and Building Automation
z Infrared Receiver Replacements z
Industrial Monitoring and Controls
z Remote Automated Meter Reading
z Remote Lighting Control System
z Wireless Alarm and Security Systems
z Remote Keyless Entry (RKE)
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Rev 1.0 | Page 1 / 17






RFM210LW Datasheet, Funktion
RFM210LW
1.4 Crystal Oscillator
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Crystal Frequency[1]
Crystal Tolerance[2]
FXTAL315
FXTAL433.92
FRF = 315 MHz
FRF = 433.92 MHz
18.8744
26
±20
MHz
MHz
ppm
Load Capacitance
CLOAD
10 15 20 pF
Crystal ESR
Drive Level
Rm
60 Ω
100 uw
Aging Per Year
±2 ppm
XTAL Startup Time[3]
tXTAL
400 us
Notes:
[1]. The RFM210LW can directly work with external reference clock input to XIN pin (a coupling capacitor is required)
with peak-to-peak amplitude of 0.3 to 0.7 V.
[2]. This is the total tolerance including (1) initial tolerance, (2) crystal loading, (3) aging, and (4) temperature dependence.
The acceptable crystal tolerance depends on RF frequency and channel spacing/bandwidth.
[3]. This parameter is to a large degree crystal dependent.
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Rev 1.0 | Page 6 / 17

6 Page









RFM210LW pdf, datenblatt
RFM210LW
achieves over 25 dB image rejection ratio typically. The IF center frequency is dynamically adjusted to enable the IF filter to
locate to the right frequency band, thus the receiver sensitivity and out-of-band interference attenuation performance are kept
optimal despite the manufacturing process tolerances. The IF bandwidth is fixed at 200 kHz.
5.4.3 RSSI
The subsequent multistage I/Q Log amplifiers enhance the output signal from IF filter before it is fed for demodulation. Receive
Signal Strength Indicator (RSSI) generators are included in both Log amplifiers which produce DC voltages that are directly
proportional to the input signal level in both of I and Q path. The resulting RSSI is a sum of both these two paths. Extending from
the nominal sensitivity level, the RSSI achieves dynamic range over 66 dB.
The RFM210LW integrates a patented DC-offset cancellation engine. The receiver sensitivity performance benefits a lot from
the novel, fast and accurate DC-offset removal implementation.
5.4.4 SAR ADC
The on-chip 8-bit SAR ADC digitalizes the RSSI for OOK demodulation.
5.4.5 Crystal Oscillator
The crystal oscillator is used as the reference clock for the PLL frequency synthesizer and system clock for the digital blocks. A
crystal should be used with appropriate loading capacitors (C2 and C3 in Figure 9 of Page 9). The values of the loading
capacitors depend on the total load capacitance CL specified for the crystal. The total load capacitance seen between the XIN
and XOUT pin should equal CL for the crystal to oscillate at desired frequency.
CL =
1
1
C2
+
1
C3
+ Cparasitic
The parasitic capacitance is constituted by the input capacitance and PCB tray capacitance. The ESR of the crystal should be
within the specification in order to ensure a reliable start-up. An external signal source can easily be used in place of a
conventional XTAL and should be connected to the XIN pin. The incoming clock signal is recommended to have a peak-to-peak
swing in the range of 300 mV to 700 mV and AC-coupled to the XIN pin.
5.4.6 Frequency Synthesizer
A fractional-N frequency synthesizer is used to generate the LO frequency for the down conversion I/Q mixer. The frequency
synthesizer is fully integrated except the VCO tank inductor which enables the ultra low-power receiver system design. Using the
26 MHz reference clock provided by the crystal oscillator or the external clock source, it can generate receive frequencies of 315
and 433.92 MHz with a frequency resolution of 24.8 Hz.
The VCO always operates at 2x of LO frequency. A high Q (at VCO frequency) tank inductor should be chosen to ensure the
VCO oscillates at any conditions meanwhile burns less power and gets better phase noise performance. In addition, properly
layout the inductor matters a lot of achieving a good phase noise performance and less spurious emission. The recommended
VCO inductors for different LO frequency bands are shown as bellow.
Table 9. VCO Inductor for 315/433.92 MHz Frequency Band
LO Frequency Band (MHz)
VCO Inductor (nH)
315 433.92
33 22
Multiple subsystem calibrations are performed dynamically to ensure the frequency synthesizer operates reliably in any
working condition
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Rev 1.0 | Page 12 / 17

12 Page





SeitenGesamt 17 Seiten
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