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| 型号： | MAX7042ATJ+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/17页 |
| 文件大小： | 0K |
| 描述： | IC RCVR RF LP FSK 32-TQFN-EP |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 频率： | 308MHz，315MHz，418MHz，433.92MHz |
| 灵敏度： | -110dBm |
| 数据传输率 - 最大： | 66 kbps |
| 调制或协议： | FSK |
| 应用： | 门禁控制，AMR，ISM，RKE，TPM |
| 电流 - 接收： | 7.2mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 电源电压： | 2.4 ~ 3.6 V & 4.5 ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
| 产品目录页面： | 1424 (CN2011-ZH PDF) |
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
Data Filters
The data filter is implemented as a 2nd-order lowpass
Sallen-Key filter. The pole locations are set by the com-
Table 2. Coefficients to Calculate C F1 and
C F2
bination of two on-chip resistors and two external
capacitors. Adjusting the value of the external capaci-
tors changes the corner frequency to optimize for dif-
ferent data rates. The corner frequency in kHz should
be to approximately the fastest expected data rate in
kbps for NRZ and twice the fastest expected data rate
FILTER TYPE
Butterworth
(Q = 0.707)
Bessel
(Q = 0.577)
a
1.414
1.3617
b
1.000
0.618
in kbps for Manchester coding from the transmitter.
Keeping the corner frequency near the data rate
rejects any noise at higher frequencies, resulting in an
increase in receiver sensitivity.
The configuration shown in Figure 2 creates a Butterworth
or Bessel response. The Butterworth filter offers a very
flat amplitude response in the passband and a rolloff rate
of 40dB/decade for the two-pole filter. The Bessel filter
has a linear phase response, which works well for filter-
MAX7042
FSK DEMOD
ing digital data. To calculate the value of the capacitors,
use the following equations along with the coefficients in
Table 2:
100k ?
100k ?
C F 1 =
b
a ( 100 k ? )( π )( f C )
DS+
C F2
OP+
C F1
DF
C F 2 =
a
4 ( 100 k ? )( π )( f C )
Figure 2. Sallen-Key Lowpass Data Filter
where f C is the desired 3dB corner frequency.
For example, choose a Butterworth filter response with
C F 1 =
≈ 450 pF
C F 2 = ≈ 225 pF
a 5kHz corner frequency:
1 . 000
( 1 . 414 )( 100 k ? )( 3 . 14 )( 5 kHz )
1 . 414
( 4 )( 100 k ? )( 3 . 14 )( 5 kHz )
Choosing standard capacitor values changes C F1 to
470pF and C F2 to 220pF. In the Typical Application
Circuit, C F1 and C F2 are named C4 and C3, respectively.
Data Slicer
The purpose of a data slicer is to take the analog output
of a data filter and convert it to a digital signal. This is
achieved by using a comparator and comparing the ana-
log input to a threshold voltage. The threshold voltage is
set by the voltage on the DS- pin, which is connected to
the negative input of the data-slicer comparator. The pos-
itive input of the data-slicer comparator is connected to
the output of the data filter internally.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7042ATJ+ | 功能描述:射频接收器 308/315/418/433.9MHz FSK Superhtrdyne Rec 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 |
| MAX7042ATJ+T | 功能描述:射频接收器 308/315/418/433.9MHz FSK Superhtrdyne Rec 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 |
| MAX7042ATJ-T | 制造商:Maxim Integrated Products 功能描述:308MHZ/315MHZ/418MHZ/434MHZ LOW-POWER, FSK SU - Tape and Reel |
| MAX7042EVKIT-315 | 功能描述:射频开发工具 RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| MAX7042EVKIT-315+ | 功能描述:射频开发工具 MAX7042 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
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