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参数资料
| 型号： | RFRXD0920-I/LQ |
| 厂商： | Microchip Technology |
| 文件页数： | 7/32页 |
| 文件大小： | 0K |
| 描述： | MODULE RCVR 868/915MHZ ASK/FSK |
| 产品变化通告： | RFRXD0(4,9)20I/LQ Obsolescence 07/Mar/2012 |
| 标准包装： | 250 |
| 频率： | 800MHz ~ 930MHz |
| 灵敏度： | -106dBm |
| 数据传输率 - 最大： | 80 kbps |
| 调制或协议： | ASK，FM，FSK |
| 应用： | 家庭自动化，遥感，RKE |
| 电流 - 接收： | 9.2mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-LQFP |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 托盘 |
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rfRXD0420/0920
employed in this design because it can handle a larger
dynamic range while consuming less power with simple
circuitry than AGC circuitry.
The internal resistance of the 2IF IN pin is approximately
For FSK and FM demodulation, the RSSI represents
the received signal strength of the incoming RF signal.
The RSSI pin is illustrated in Figure 2-9.
2.2 k ? . In order to terminate ceramic IF filters whose
output impedance is 330 ? , a 390 ? resistor can be
paralleled to the 2IF IN and FBC2 pins.
FBC1 (Pin 12) and FBC2 (Pin 13) are connected to
FIGURE 2-9:
BLOCK DIAGRAM OF RSSI
PIN
V DD
external feedback capacitors.
RSSI
50 ?
I (Pi)
The IF Limiting Amplifier pins are illustrated in
Figures 2-7 and 2-8.
21
V SS
36 k ?
FIGURE 2-7:
BLOCK DIAGRAM OF IF
LIMITING AMPLIFIER INPUT
V SS
PINS
2.6
Demodulator
2IF IN
11
V DD
V DD
FBC1
12
The demodulator (DEMOD) section consists of a phase
detector (MIXER2) and amplifier creating a quadrature
detector (also known as a phase coincidence detector)
to demodulate the IF signal in FSK and FM modulation
applications. The quadrature detector provides all the
FBC2
13
V SS
V DD
2.2 k ?
Vss
2.2 k ?
200 μ A
V SS
IF functions required for FSK and FM demodulation
with only a few external parts.
The in-phase signal comes directly from the output of
the IF limiting amplifier to MIXER2. The quadrature
signal is created by an external tuned circuit from the
V SS
output of the IF limiting amplifier (2IF OUT , Pin 15) AC-
coupled to the MIXER2 DEM IN (Pin 16) input. The input
impedance of the DEM IN pin is approximately 47 k ? .
FIGURE 2-8:
BLOCK DIAGRAM OF IF
LIMITING AMPLIFIER OUTPUT
PIN
The external tuned circuit can be constructed from sim-
ple inductor-capacitor (LC) components but will require
one of the elements to be tunable. A no-tune solution
V DD
V DD
can be constructed with a ceramic discriminator.
The output voltage of the DEMOD amplifier (DEMout+
2IF OUT
15
V SS
40 μ A
V SS
and DEMout-, Pins 23 and 24) depends on the peak
deviation of the FSK or FM signal and the Q of the
external tuned circuit. DEMout+ and DEMout- are high
impedance outputs with only a 20 μ A current capability.
The Demodulator pins are illustrated in Figures 2-10
and 2-11.
2.5.2
RECEIVED SIGNAL STRENGTH
INDICATOR (RSSI)
FIGURE 2-10: BLOCK DIAGRAM OF
DEMODULATOR INPUT PIN
The RSSI signal is proportional to the log of the signal
at 2IF IN . The 2IF IN input RSSI range is approximately
40 μ V to 160 mV. The slope of the RSSI output is
approximately 26 mV/dB of RF signal.
The RSSI output has an internal 36 k ? resister to Vss
fed by a current source. This resistor converts the
DEM IN
16
V DD
V DD
47 k ?
V DD
RSSI current to voltage.
For Amplitude Shift Keying (ASK) demodulation, RSSI
is compared to a reference voltage (static or dynamic).
Post detector filtering is easily implemented by
connecting a capacitor to ground from the RSSI pin
effectively creating an RC filter with the internal 36 k ?
resistor.
V SS
? 2003 Microchip Technology Inc.
Preliminary
DS70090A-page 7
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