RF315M
315MHz RF Receiver module
About this module
Introduction
The RF315M Module is designed to receive amplitude-shift-keyed (ASK) and on-off-keyed (OOK) data in the 315MHz frequency range. The receiver has an RF input signal range of -106dBm to 0dBm.
This module has few external components and has a power-down pin to put it in a low-current sleep mode, uses a very-low intermediate frequency 200 kHz
The device also contains an on-chip automatic gain control (AGC) that reduces the LNA gain by 30dB when the input signal power is large and operates from either a 3~5V power supply and draws 5.5mA (typ) of current.
This module is specified over AEC-Q100 Level 2 (-40ºC to +105 ºC)
Features:
ASK/OOK Modulation
- < 250μs Enable Turn-On Time
- PLL, VCO, Mixer, IF, Baseband
- Low IF (200kHz Nominal)
- 5mA DC Current
- 1μA Standby Current
- 3V/5V Operation
- (-)106dBm receiver sensitivity
Hardware Overview
Dimension
IO Description
| No | Name | Description |
| 1 | RF_IN | RF Signal Input |
| 2 | GND | Ground |
| 3 | GND | Ground |
| 4 | GND | Ground |
| 5 | VCC | Power Supply, 3.0V ~ 5.0V |
| 6 | EN# | Module Enable Signal(Active LOW Enable) |
| 7 | GND | Ground |
| 8 | GND | Ground |
| 9 | GND | Ground |
| 10 | DATA-OUT | Data Output Signal |
Electrical Characteristics
Absolute Maximum Ratings
VCC to GND —————– -0.3V to +6.0V ENABLE to GND ——— -0.3V to VCC+0.3V
RFIN to GND ——– -0.3V to +1.2V
DATA OUT to GND ——– -0.3V to VCC+0.3V
DC Characteristics
| PARAMETER | SYMBOL | CONDITIONS | MIN TYP MAX | UNITS |
| Supply Voltage | VCC | 3.0 – 5 | V | |
| Supply Current | IIN | TA < +105°C EN =0 | 6.8 | mA |
| Deep-sleep mode, EN =VCC | 4 | μA | ||
| DIGITAL INPUT(ENABLE) | ||||
| Input High Voltage | VIH | VCC -0.4 | V | |
| Input Low Voltage | VIL | 0.4 | V | |
| Input Current | IENABLE | 0 ≤ VENABLE ≤ VCC | 20 | μA |
| DIGITAL OUTPUT(DATAOUT) | ||||
| Output Low Voltage | VOL | ISINK = 100μA | 0.4 | V |
| Output High Voltage | VOH | ISOURCE = 100μA | VCC -0.4 | V |
AC Characteristics
| PARAMETER | SYMBOL | CONDITIONS | MIN TYP MAX | UNITS | |
| Receiver Input Frequency Range | fRF | 300 450 | MHz | ||
| Maximum Receiver Input Level | PRFIN | 0 | dBm | ||
| Sensitivity | fRF = 315MHz | -106 | dBm | ||
| Power-On Time | tON | Time for valid RSSI output | Enable power on (VDD > 3.0V) | 250 | μs |
| VDD power on | 1 | ms | |||
| AGC Hysteresis | 5 | dB | |||
| AGC Low Gain-to-HighGain Switching Time |
13 | ms | |||
| LNA/MIXER | |||||
| LNA Input Impedance | ZINLNA | Normalized to 50Ω | fRF = 315MHz | 50 +j3.8 | Ω |
| LO Signal Feedthrough to Antenna | 75 | dBm | |||
| Voltage Gain Reduction | Low-gain mode, AGC enabled | 29 | dB | ||
| LNA/Mixer Voltage Gain | High-gain LNA mode | 55 | dB | ||
| Low-gain LNA mode | 26 | ||||
| 3dB Cutoff Frequency | BWIF | Set by capacitors on IFC1 and IFC2 | 280 | kHz | |
| RSSI Linearity | ±0.5 | dB | |||
| RSSI Dynamic Range | Includes AGC | 80 | dB | ||
| RSSI Level | PRFIN < -120dBm | 1.34 | V | ||
| PRFIN > 0dBm, AGC enabled | 2.35 | ||||
| Intermediate Frequency | fIF | 200 | kHz | ||
| Maximum Data-Filter Bandwidth | BWDF | 50 | kHz | ||
| Maximum Data-Slicer Bandwidth | BWDS | 100 | kHz | ||
| Maximum Peak Detector Bandwidth |
50 | kHz | |||
| Maximum Data Rate | Manchester coded | 33 | kbps | ||
| Nonreturn to zero (NRZ) | 66 | ||||
| Crystal Frequency | fXTAL | 9.8375 | MHz | ||
| Crystal Load Capacitance | CLOAD | 10 | pF | ||
(note1) When EN=Low, 315MHz impedance is 50+j 3.8 , Return loss ≥ 12dB, and VSWR≤2
