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| 型号： | MICRF507YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 31/47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.
Frequency Deviation under VCO Modulation
Three factors determine the deviation at which the data
stream is modulated: modulator clock frequency, capacitor
charge/discharge current, and modulator attenuator
setting. After each is presented in turn, the complete
formula for deviation is given.
The modulator clock frequency is determined by the
crystal oscillator frequency and the settings of the
Refclk_K and Mod_clkS fields:
MICRF507
To avoid saturation in the modulator, it is important not to
exceed maximum Mod_I. Maximum Mod_I for a given
f MOD_CLK is given by:
Mod_I MAX = INT(f MOD_CLK ? 28 × 10 -6 ) - 1
where INT() returns the integer part of the argument.
f MOD_CLK =
f XCO
Refclk_K × 2 (7 - Mod_clkS)
Set the modulator clock frequency to either 8x or 16x the
frequency deviation rate.
Figure 21. Two Different Modulator Current Settings
A third factor determining deviation is the modulator
attenuator , controlled by the Mod_A field. The attenuator is
used when the bit rate is small and/or the BT is small,
which gives a relatively slow modulator clock and therefore
long rise- and fall times, leading in turn to large frequency
deviations unless the signal is attenuated. Additionally, the
attenuator will improve the resolution in the modulator.
Figure 20. Two Different Modulator Clock Settings
Having f MOD_CLK set at 8 times the bit rate corresponds to a
baseband data signal filtered in a Gaussian filter with a
bandwidth-period product (BT) of 1. When BT is increased,
the waveform will be less filtered. Figure 20 shows two
waveforms with BT=1 (the minimum, with f MOD_CLK at 8
times the bitrate) and BT=2 (with f MOD_CLK at 16 times the
bit rate). Changing BT changes the charge-and discharge
times and therefore the frequency deviation, as seen in
Figure 20.
The capacitor charge/discharge current , set with the Mod_I
field, affects deviation, as shown in Figure 21, where
Mod_Ia>Mod_Ib. Higher current will give a higher
frequency deviation and vice versa. The effect of
modulator clock and Mod_I is as follows:
Figure 22. Two Different Modulator Attenuator Settings
The effect of the attenuator is given by:
f DEV
∝
Mod_I
f MOD_CLK
f DEV ∝
1
1 + Mod_A
October 2, 2013
31
Revision 2.2
相关PDF资料 |
PDF描述 |
|---|---|
| MICRF600DEV1 | KIT DEV RADIOWIRE 902-928MHZ |
| MK01-C | SENSOR REED SPST-NO SMD |
| MK01-H | SENSOR REED SPDT-CHANGE SMD |
| MK02/0-1A66-500W | SENSOR REED SPST-NO |
| MK02/6-0 | SENSOR REED PCB 24MM T/H |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MICRF600 | 功能描述:TXRX ISM 902-928MHZ 11.5X14.1MM RoHS:否 类别:RF/IF 和 RFID >> RF 收发器 系列:RadioWire® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:30 系列:- 频率:4.9GHz ~ 5.9GHz 数据传输率 - 最大:54Mbps 调制或协议:* 应用:* 功率 - 输出:-3dBm 灵敏度:- 电源电压:2.7 V ~ 3.6 V 电流 - 接收:* 电流 - 传输:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 工作温度:-25°C ~ 85°C 封装/外壳:68-TQFN 裸露焊盘 包装:管件 |
| MICRF600 TR | 制造商:Micrel 功能描述:Micrel MICRF600 TR RF Transceivers |
| MICRF600_06 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:902-928MHz ISM Band Transceiver Module |
| MICRF600DEV1 | 功能描述:KIT DEV RADIOWIRE 902-928MHZ RoHS:是 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:RadioWire® 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
| MICRF600TR | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:902-928MHz ISM Band Transceiver Module |
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