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參數(shù)資料
| 型號(hào)： | MICRF610 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 868-870 MHz ISM Band Transceiver Module |
| 中文描述： | 868-870 MHz ISM頻帶收發(fā)模塊 |
| 文件頁數(shù)： | 6/19頁 |
| 文件大?。?/td> | 303K |
| 代理商： | MICRF610 |
Micrel, Inc.
MICRF620
December 2005
14
M9999-120205
Front End
A6..A0
D7
D6
D5
D4
D3
D2
D1
D0
0000000
LNA_by
PA2
PA1
PA0
Sync_en
Mode1 Mode0
’1’
A low noise amplifier in RF receivers is used to boost the
incoming signal prior to the frequency conversion process.
This is important in order to prevent mixer noise from
dominating the overall front-end noise performance. The
LNA is a two-stage amplifier and has a nominal gain of
approximately 23dB at 434MHz. The front end has a gain
of about 33dB to 35dB. The gain varies by 1-1.5dB over a
2.0V to 2.5V variation in power supply.
The LNA can be bypassed by setting bit LNA_by to ‘1’.
This can be useful for very strong input signal levels. The
front-end gain with the LNA bypassed is about 9-10dB.
The mixers have a gain of about 10dB at 434MHz.
Sallen-Key Filters
A6..A0
D7
D6
D5
D4
D3
D2
D1
D0
0000001
‘1’
‘0’
RSSI_en
LD_en
PF_FC1
PF_FC0
Each channel includes a pre-amplifier and a prefilter,
which is a three-pole Sallen-Key lowpass filter. It protects
the following switched-capacitor filter from strong adjacent
channel signals, and it also works as an anti-aliasing filter.
The preamplifier has a gain of 22.23dB. The maximum
output voltage swing is about 1.4Vpp for a 2.25V power
supply. In addition, the IF amplifier also performs offset
cancellation. Gain varies by less than 0.5dB over a 2.0 –
2.5V variation in power supply. The third order Sallen-Key
lowpass filter is programmable to four different cut-off
frequencies according to the table below:
PF_FC1
PF_FC0
Cut-off Freq. (kHz)
0
100
0
1
150
1
0
230
1
340
Switched Capacitor Filter
A6..A0
D7
D6
D5
D4
D3
D2
D1
D0
0001000
‘1’
ScClk5
ScClk4
ScClk3
ScClk2
ScClk1
ScClk0
The
main
channel
filter
is
a
switched-capacitor
implementation of a six-pole elliptic low pass filter. The
elliptic filter minimized the total capacitance required for a
given selectivity and dynamic range. The cut-off frequency
of the switched-capacitor filter is adjustable by changing
the clock frequency.
The clock frequency is designed to be 20 times the cut-off
frequency. The clock frequency is derived from the
reference crystal oscillator. A programmable 6-bit divider
divides the frequency of the crystal oscillator. The cut-off
frequency of the filter is given by:
ScClk
40
f
XCO
CUT
=
fCUT: Filter cutoff frequency
fXCO: Crystal oscillator frequency
ScCLK: Switched capacitor filter clock, bits ScClk5-0
1
st order RC lowpass filters are connected to the output of
the SC filter to filter the clock frequency.
The lowest cutoff frequency in the pre- and the main
channel filter must be set so that the received signal is
passed with no attenuation, that is frequency deviation
plus modulation. If there are any frequency offset between
the transmitter and the receiver, this must also be taken
into consideration. A formula for the receiver bandwidth
can be summarized as follows:
2
/
Baudrate
f
DEV
OFFSET
BW
+
=
where
fBW: Needed receiver bandwidth, fcut above should
not be smaller than fBW (Hz)
foffset: Total frequency offset between receiver and
transmitter (Hz)
fDEV: Single-sided frequency deviation
Baudrate: The baud rate given is bit/sec
RSSI
A6..A0
D7
D6
D5
D4
D3
D2
D1
D0
0000001
‘1’
‘0’
RSSI_en
LD_en
PF_FC1
PF_FC0
0
0,5
1
1,5
2
2,5
-110
-100
-90
-80
-70
-60
-50
-40
Pin
(dBm)
RSSI
Figure 9. RSSI Voltage
A Typical plot of the RSSI voltage as function of input
power is shown in Figure 9. The RSSI has a dynamic
range of about 50dB from about -110dBm to -60dBm input
power.
The RSSI can be used as a signal presence indicator.
When a RF signal is received, the RSSI output increases.
This could be used to wake up circuitry that is normally in
a sleep mode configuration to conserve battery life.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MICRF610_0608 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:868-870MHz ISM Band Transceiver Module |
| MICRF610DEV1 | 制造商:Micrel Inc 功能描述:DEVELOPMENT KIT TRANSCEIVER 868MHZ |
| MICRF610TR | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:868-870 MHz ISM Band Transceiver Module |
| MICRF610Z | 功能描述:IC RF MOD 868-870MHZ 11.5X14.1MM RoHS:是 類別:RF/IF 和 RFID >> RF 收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:30 系列:- 頻率:4.9GHz ~ 5.9GHz 數(shù)據(jù)傳輸率 - 最大:54Mbps 調(diào)制或協(xié)議:* 應(yīng)用:* 功率 - 輸出:-3dBm 靈敏度:- 電源電壓:2.7 V ~ 3.6 V 電流 - 接收:* 電流 - 傳輸:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲(chǔ)容量:- 天線連接器:PCB，表面貼裝 工作溫度:-25°C ~ 85°C 封裝/外殼:68-TQFN 裸露焊盤 包裝:管件 |
| MICRF610Z TR | 功能描述:IC RF MOD 868-870MHZ 11.5X14.1MM RoHS:是 類別:RF/IF 和 RFID >> RF 收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:30 系列:- 頻率:4.9GHz ~ 5.9GHz 數(shù)據(jù)傳輸率 - 最大:54Mbps 調(diào)制或協(xié)議:* 應(yīng)用:* 功率 - 輸出:-3dBm 靈敏度:- 電源電壓:2.7 V ~ 3.6 V 電流 - 接收:* 電流 - 傳輸:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲(chǔ)容量:- 天線連接器:PCB，表面貼裝 工作溫度:-25°C ~ 85°C 封裝/外殼:68-TQFN 裸露焊盤 包裝:管件 |
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