- 您现在的位置：买卖IC网 > PDF目录18710 > MAX7042EVKIT-315+ (Maxim Integrated)EVAL KIT MAX7042 PDF资料下载
参数资料
| 型号： | MAX7042EVKIT-315+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/17页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX7042 |
| 标准包装： | 1 |
| 系列： | * |
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
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX7032EVKIT-433 | EVAL KIT MAX7032 |
| MAX7036EVKIT-315+ | EVAL KIT MAX7036 |
| MAX7034EVKIT-315+ | EVAL KIT MAX7034 |
| MAX1472EVKIT-315 | EVAL KIT MAX1472 |
| 0622022020 | TOOL INSERTION 50POS 4ROWS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX7042EVKIT-433 | 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-433+ | 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 |
| MAX7043EUI+ | 功能描述:射频收发器 300MHz To 450MHz ASK FSK Superhtrdyne Rec RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| MAX7043EUI+T | 功能描述:射频收发器 300MHz To 450MHz ASK FSK Superhtrdyne Rec RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
发布紧急采购，3分钟左右您将得到回复。