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| 型号： | MICRF008YM |
| 厂商： | Micrel Inc |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC RECEIVER 300-440MHZ 8-SOIC |
| 标准包装： | 95 |
| 系列： | QwikRadio® |
| 频率： | 300MHz ~ 440MHz |
| 灵敏度： | -95dBm |
| 数据传输率 - 最大： | 4.8 kbps |
| 调制或协议： | OOK |
| 应用： | 车库门开启器 |
| 电流 - 接收： | 7mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 特点： | 自动调谐 |
| 电源电压： | 4.75 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 571 (CN2011-ZH PDF) |
| 其它名称： | 576-1961-5 MICRF008YM-ND |
[ F ]
C TH =
REFOSC =
Micrel, Inc.
C TH Capacitor
In order to calculate the right value for the C TH capacitor,
the data format needs to have a preamble that
resembles the data pattern, that is it has the same
period and duty cycle. (See “Application Hint 42” ) If the
data pattern has no preamble, a large capacitor value
should be used, such as 1 μ F to 2.2 μ F. However, if the
data pattern has a preamble, the C TH capacitor can be
calculated and should be used instead of a large
capacitor. This will guarantee a stable and reliable
performance for the receiver. If the data pattern has
variable data rates, the C TH capacitor should be
calculated for the lowest data rate and optimized in
range tests. To find the C TH capacitor value follow the
procedure below:
1. Find the data period or bit period, and the
reference oscillator frequency. The reference
oscillator frequency is the RF carrier frequency
divided by 129. The bit period is the elapsed
time from one high and one low of the data
pattern.
2. The C TH capacitor is calculated by:
5 × bit period × REFOSC
144.55 × 10 3
where:
REFOSC is the reference oscillator frequency in MHz.
Bit period is given in seconds and is the inverse of the
baud rate for Manchester encoding.
The result obtained is in farads.
It follows the C TH capacitor value for the common
frequencies mentioned above in the Table 4. Again, as
mentioned before, the data pattern needs preamble.
MICRF008
times faster. The drawback is the ripple noise from AGC
pin being thrown into the V DD line. The signal on this pin
is current-based, with an attack current of 15 μ A, and a
decay current of 1.5 μ A. It is suggested the following
values for the C AGC capacitors in the Table 5. Values can
be further optimized during receiver range tests.
Baud Rate (Hz) C AGC (μF)
1000 4.7 to 10
2400 2.2 to 4.7
4800 1 to 2.2
Table 5. Recommended Values for C AGC
Reference Oscillator Frequency
A Colpitts oscillator inside the chip generates the
reference oscillator frequency. It requires a resonator of
some kind connected to the REFOSC pin. Either a
ceramic resonator or a crystal can be used. A resonator
is chosen due to its lower cost and because the
MICRF008YM is running in sweep mode, which does not
require the precision of a crystal. Resonators found in
the market normally have a precision of 0.5%. This
precision is sufficient for the MICRF008YM. The
reference oscillator frequency can also be generated by
an external source through connector J1 and capacitor
C1. The maximum level should not exceed 0.5V RMS . The
reference oscillator frequency is calculated by the
following equation and Table 6 shows the resonator
frequency for the most common used frequencies:
fc
129
Frequency
(MHz)
315
390
1000
C TH
82nF
100nF
Baud Rate (Hz)
2400
C TH
39nF
47nF
4800
C TH
18nF
22nF
where:
?
?
REFOSC is the reference oscillator frequency in
MHz.
fc is the RF received carrier frequency of interest
in MHz.
418
433.93
120nF
120nF
47nF
47nF
22nF
22nF
Frequency (MHz)
315
REFOSC (MHz)
2.44
Table 4. Recommended C TH Capacitor Values
390
418
3.02
3.24
C AGC Capacitor
The function of the C AGC capacitor is to minimize the
ripple on the AGC control voltage by using a sufficiently
large capacitor. It is suggested a value between 1 μ F to
10 μ F depending on data dead time, noise, and recovery
time from strong to low RF signals. Large capacitor
values can be connected to V DD if fast charge time is
required (C2). When connected to V DD , it will charge 10
433.92 3.36
Table 6. Reference Oscillator Frequency
For a list of ceramic resonator manufactures, see
“Application Hint 35.”
August 2008
11
M9999-080108
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| MICRF008YM TR | 功能描述:射频接收器 300-440MHz Low-Cost Receiver, Sweep-Mode( Lead Free) RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MICRF009 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:QwikRadio Low-Power UHF Receiver |
| MICRF009BM | 功能描述:IC RECEIVER UHF LOW POWER 16SOIC RoHS:否 类别:RF/IF 和 RFID >> RF 接收器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 09/Jan/2012 标准包装:50 系列:* 频率:850MHz ~ 2.175GHz 灵敏度:- 数据传输率 - 最大:- 调制或协议:- 应用:* 电流 - 接收:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特点:- 电源电压:4.75 V ~ 5.25 V 工作温度:0°C ~ 85°C 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| MICRF009BM TR | 功能描述:IC RCVR UHF 300-440MHZ 16-SOIC RoHS:否 类别:RF/IF 和 RFID >> RF 接收器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 09/Jan/2012 标准包装:50 系列:* 频率:850MHz ~ 2.175GHz 灵敏度:- 数据传输率 - 最大:- 调制或协议:- 应用:* 电流 - 接收:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特点:- 电源电压:4.75 V ~ 5.25 V 工作温度:0°C ~ 85°C 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| MICRF009YM | 功能描述:射频接收器 300-440MHz High Sensitivity Receiver( Lead Free) RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
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