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| 型号： | MAX7042ATJ+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/17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
Numerous configurations can be used to generate the
data-slicer threshold. For example, the circuit in Figure 3
shows a simple method using only one resistor and one
capacitor. This configuration averages the analog out-
put of the filter and sets the threshold to approximately
50% of that amplitude. With this configuration, the
threshold automatically adjusts as the analog signal
varies, minimizing the possibility for errors in the digital
MAX7042
DATA
SLICER
data. The values of R and C affect how fast the thresh-
old tracks the analog amplitude. Be sure to keep the
DATA
DS-
R
DS+
corner frequency of the RC circuit much lower than the
lowest expected data rate.
With this configuration, a long string of zeros or ones
can cause the threshold to drift. This configuration
works best if a coding scheme, such as Manchester
coding, which has an equal number of zeros and ones,
is used.
Figure 4 shows a configuration that uses the positive and
negative peak detectors to generate the threshold. This
configuration sets the threshold to the midpoint between
a high output and a low output of the data filter.
C
Figure 3. Generating Data-Slicer Threshold
MAX7042
Peak Detectors
The maximum peak detector (PDMAX) and minimum
DATA
SLICER
PEAK
DET
PEAK
DET
peak detector (PDMIN) outputs, in conjunction with a
resistor and capacitor connected to GND, create DC
output voltages proportional to the high- and low-peak
values of the data signal. The resistor provides a path
for the capacitor to discharge, allowing the peak detec-
DATA
PDMAX
R
R
PDMIN
tor to dynamically follow peak changes of the data-filter
output voltage.
The positive and negative peak detectors can be used
C
C
together to form a data-slicer threshold voltage at a
midvalue between the most positive and most negative
voltage levels of the data stream (see the Data Slicers
section and Figure 4). Set the RC time constant of the
peak-detector combining network to at least 5 times the
data period.
The MAX7042 peak detectors track the baseband filter
output voltage until all internal circuits are stable follow-
ing an enable pin low-to-high transition. This feature
allows for an extremely fast startup because the peak
detectors never “catch” a false level created by a startup
transient. The peak detectors exhibit a fast-attack/slow-
decay response.
Power-Supply Connections
The MAX7042 can be powered from a 2.4V to 3.6V
supply or a 4.5V to 5.5V supply. The device has an on-
chip linear regulator that reduces the 5V supply to 3V
needed to operate the chip.
Figure 4. Generating Data-Slicer Threshold Using the Peak
Detectors
To operate the MAX7042 from a 3V supply, connect
DVDD, AVDD, and HVIN to the 3V supply. When using
a 5V supply, connect the supply to HVIN only, and con-
nect AVDD to DVDD. In both cases, bypass DVDD and
HVIN with a 0.01μF capacitor and AVDD with a 0.1μF
capacitor. Place all bypass capacitors as close to the
respective supply pin as possible.
Control Interface Considerations
When operating the MAX7042 with a +4.5V to +5.5V
supply voltage, the LNASEL, FSEL1, FSEL2, and EN
pins can be driven by a microcontroller with either 3V
or 5V interface logic levels. When operating the
MAX7042 with a +2.4V to +3.6V supply, the microcon-
troller must produce logic levels tha conform to the V IH
and V IL specifications in the DC Electrical
Characteristics Table.
14
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相关代理商/技术参数 |
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|---|---|
| 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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