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参数资料
| 型号： | MAX7036EVKIT-433+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX7036 |
| 标准包装： | 1 |
| 系列： | * |
300MHz to 450MHz ASK Receiver
with Internal IF Filter
= 375 pF
C 5 =
C 6 =
= 186 pF
For example, to choose a Butterworth filter response
with a corner frequency of 6kHz:
1 . 000
( 1 . 414 )( 100 k Ω )( 3 . 14 )( 6 kHz )
1 . 414
( 4 )( 100 k Ω )( 3 . 14 )( 6 kHz )
Choosing standard capacitor values changes C5 to
390pF and C6 to 180pF, as shown in the Typical
Application Circuit.
Table 1. Coefficients to Calculate C5
and C6
The suggested data-slicer configuration uses a resistor
(R1) connected between DSN and DSP with a capaci-
tor (C4) from DSN to GND (Figure 3). This configuration
averages the analog output 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 data. The values of R1 and C4
affect how fast the threshold tracks to the analog ampli-
tude. Be sure to keep the corner frequency of the RC
circuit much lower than the lowest expected data rate.
MAX7036
FILTER TYPE
Butterworth (Q = 0.707)
Bessel (Q = 0.577)
a
1.414
1.3617
b
1.000
0.618
DATA
DATA
FILTER
SLICER
20
17
16
DATAOUT
DSN
R1
DSP
MAX7036
R DF2
100k Ω
RSSI
R DF1
100k Ω
C4
Figure 3. Generating Data-Slicer Threshold
16
DSP
14
OPP
C6
15
DFFB
C5
Note that a long string of zeros or ones can cause the
threshold to drift. This configuration works best if a
coding scheme (e.g., Manchester coding, which has an
equal number of zeros and ones) is used.
Peak Detector
The peak-detector output (PDOUT), in conjunction with
Figure 2. Sallen-Key Lowpass Data Filter
Data Slicer
The data slicer takes the analog output of the data filter
and converts it to a digital signal. This is achieved by
using a comparator and comparing the analog input to
a threshold voltage. One input is supplied by the data-
filter output. Both comparator inputs are accessible off
chip to allow for different methods of generating the
slicing threshold, which is applied to the second com-
parator input.
an external RC filter, creates a DC output voltage equal
to the peak value of the data signal. The resistor pro-
vides a path for the capacitor to discharge, allowing the
peak detector to dynamically follow peak changes of
the data-filter output voltage. The peak detector can be
used for at least two functions. First, it can serve as an
RSSI for ASK modulation. Second, it can be used for
faster data-slicer response by adding it to the threshold
pin (DSN) on the data-slicer comparator (Figure 4). The
two capacitors in this circuit should be equal, and the
peak detector resistor should be approximately 10
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7036EVKIT-433+ | 功能描述:射频开发工具 MAX7036 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 |
| MAX7036GTP/V+ | 功能描述:射频接收器 300MHz to 450MHz ASK Receiver with Internal IF Filter 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 |
| MAX7036GTP/V+T | 功能描述:射频接收器 300 MHz/450MHz ASK Receiver W/Internal IF Filter 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 |
| MAX7036GTP/V+TW | 制造商:Maxim Integrated Products 功能描述:300MHZ TO 450MHZ ASK RECEIVER WITH INTERNAL IF FILTER - Tape and Reel |
| MAX7036GTP/V+W | 制造商:Maxim Integrated Products 功能描述:300MHZ TO 450MHZ ASK RECEIVER WITH INTERNAL IF FILTER - Rail/Tube |
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