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| 型号： | RFRXD0920-I/LQ |
| 厂商： | Microchip Technology |
| 文件页数： | 12/32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
3.1.7
LNA TUNED CIRCUIT
3.1.8
MIXER1 BIAS
The LNA OUT (Pin 3) has an open-collector output. It is
pulled up to V DD via a tuned circuit. It is also connected
to 1IF IN (Pin 4) via a series decoupling capacitor. The
1IF IN input impedance is approximately 33 ? || 1.5 pF.
Important: To ensure LNA stability the V SS pin (Pin 1)
The 1IF+ (Pin 6) and 1IF- (Pin 7) are bias connections
to the MIXER1 balanced collectors. Both pins are
open-collector outputs and are individually pulled up to
V DD by a load resistor. Figure 3-7 shows a MIXER1
bias example circuit.
must be connected to a low impedance ground.
As shown in Figure 3-6, components C1 and L1 make
up the tuned circuit and provide collector current via
pull-up. Together with decoupling capacitor C2, they
FIGURE 3-7:
MIXER1 BIAS EXAMPLE
CIRCUIT
provided impedance matching between the LNA and
MIXER1. To a lesser extent, C1, L1, and C2 provide
band-pass filtering at the receive frequency (f rf ).
Component values depend on the selected receive
frequency. The challenge is to design the circuit with
the fewest components setting Q as high as possible
as limited by component tolerances. For a majority of
applications it is best to design a wide bandwidth tuned
V DD
R1
470 ?
6
V DD
R2
470 ?
7
circuit to account for manufacturing and component
tolerances. The best approach is to design the tuned
circuit using a filter simulation program. Table 3-3 lists
3.1.9
INTERMEDIATE FREQUENCY (IF)
FILTER
example component values for popular receive
frequencies.
The IF filter defines the overall adjacent signal selectiv-
ity of the receiver. For a majority of applications, low-
cost 10.7 MHz ceramic IF filters are used. These are
FIGURE 3-6:
LNA OUTPUT TO MIXER1
EXAMPLE CIRCUIT.
V DD
C Bypass
available in a variety of bandwidths and packages.
IF filter bandwidth selection is a function of:
? modulation (ASK, FSK or FM)
? signal bandwidth
? frequency and temperature tolerances of the
transmitter and receiver components
The typical input and output impedance of ceramic
filters is 330 ? . 1IF OUT (Pin 9) has an approximately
330 ? single-ended output impedance and provides a
C1
L1
C2
direct match to the ceramic IF filter. The internal resis-
tance of the 2IF IN (Pin 11) is approximately 2.2 k ? . In
order to terminate ceramic IF filters a 390 ? resistor
can be paralleled to the 2IF IN and FBC2 (Pin 13).
3
4
Figure 3-8 shows an example circuit schematic using a
10.7 MHz ceramic IF filter.
3.1.10 IF LIMITING AMPLIFIER EXTERNAL
FEEDBACK CAPACITORS
TABLE 3-3: LNA TUNED CIRCUIT EXAMPLE
COMPONENT VALUES
FBC1 (Pin 12) and FBC2 (Pin 13) are connected to
external feedback capacitors. Figure 3-8 shows
f rf
315 MHz
433.92 MHz
868.3 MHz
915 MHz
C1
7.0 pF
3.0 pF
2.0 pF
2.0 pF
L1
22 nH
15 nH
7.6 nH
6.8 nH
C2
6.0 pF
6.0 pF
3.0 pF
3.0 pF
component values and connections for these
capacitors.
These values are for design guidance only.
DS70090A-page 12
Preliminary
? 2003 Microchip Technology Inc.
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