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参数资料
| 型号： | MICRF507YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 24/47页 |
| 文件大小： | 0K |
| 描述： | TXRX FSK LOW PWR W/AMP 32MLF |
| 特色产品： | MICRF507 Low-Power FSK Transceiver |
| 标准包装： | 1 |
| 系列： | RadioWire® |
| 频率： | 470MHz ~ 510MHz |
| 数据传输率 - 最大： | 200kbps |
| 调制或协议： | FSK |
| 应用： | AMR，ISM，SRD |
| 功率 - 输出： | 10dBm |
| 灵敏度： | -113dBm |
| 电源电压： | 2 V ~ 2.5 V |
| 电流 - 接收： | 12mA |
| 电流 - 传输： | 21.5mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘，32-MLF? |
| 包装： | 标准包装 |
| 其它名称： | 576-3694-6 MICRF507YML TRDKR MICRF507YML TRDKR-ND |
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Micrel, Inc.
Receiver
MICRF507
Field Name
By_LNA
PF_FC
SC_by
ScClk
RSSI_en
FEEC
FEE
Number
of bits
1
2
1
5
1
4
8
Location
of bits
Reg0[7]
Reg1[1:0]
Reg2[6]
Reg8[4:0]
Reg1[3]
Reg21[3:0]
Reg22[7:0]
Description
LNA bypass on/off
Pre-filter corner frequency
Bypass of switched capacitor filter on/off
Switched Cap clock divider
RSSI function on/off
FEE control bits
FEE value (read only)
Reference
Table 14
Table 15
Table 13. Register Bit Fields for Receiver
The receiver is a zero intermediate frequency (ZIF) type
employing low-power, fully integrated low-pass filters.
A low noise amplifier (LNA) drives a quadrature mixer pair.
The mixer outputs feed two identical signal channels.
Each channel’s signal path has a pre-amplifier, a third
order Sallen-Key RC low-pass pre-filter, a six-pole
available at pins IchOut and QchOut. The output
impedance of each mixer is about 8k ? .
switched-capacitor
filter (which determines actual
selectivity), and finally a limiter.
The limiter outputs then enter a demodulator which detects
the relative phase of the baseband I and Q signals. If the I
channel signal lags the Q channel, the FSK tone frequency
lies above the LO frequency (data ‘1’). If the I channel
leads the Q channel, then the FSK tone lies below the LO
frequency (data ‘0’). The output of the demodulator is
available on the DATAIXO pin; in either raw form or
latched with the recovered clock according to the setting of
Sync_en bit. An RSSI (receive signal strength indicator)
circuit indicates the received signal level.
Front End
The MICRF507’s low-noise amplifier boosts the incoming
signal prior to frequency conversion in order to prevent
mixer noise from degrading overall front-end noise
performance. The LNA is a two-stage amplifier and has a
nominal gain of approximately 23dB at 490MHz. The front
end has a gain of about 31dB to34dB. 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 12dB. The
mixers have about 10dB of gain at 490MHz. With
MARKER
1
2
3
MHz
470
490
510
RESISTANCE
32.4 ?
33.4 ?
34.4 ?
REACTANCE
7.9 ?
7.4 ?
6.4 ?
appropriate setting of the OUTS field (register 2, bits D3 to
D0), the differential outputs of the mixers can be made
Figure 15. LNA Input Impedance
October 2, 2013
24
Revision 2.2
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