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MAX7036 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX7036 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 13 page For example, to choose a Butterworth filter response with a corner frequency of 6kHz: Choosing standard capacitor values changes C5 to 390pF and C6 to 180pF, as shown in the Typical Application Circuit. 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. 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. 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 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 C kkHz pF C 5 1 000 1 414 100 3 14 6 375 6 = ()( )( )( ) = = . .. Ω 1 1 414 4 100 3 14 6 186 . . ()( )( )( ) = kkHz pF Ω 300MHz to 450MHz ASK Receiver with Internal IF Filter 10 ______________________________________________________________________________________ FILTER TYPE a b Butterworth (Q = 0.707) 1.414 1.000 Bessel (Q = 0.577) 1.3617 0.618 Table 1. Coefficients to Calculate C5 and C6 16 DSP C6 C5 RDF2 100k Ω RDF1 100k Ω RSSI 14 OPP 15 DFFB MAX7036 Figure 2. Sallen-Key Lowpass Data Filter 20 C4 R1 17 DSN 16 DSP MAX7036 DATAOUT DATA SLICER DATA FILTER Figure 3. Generating Data-Slicer Threshold |
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Similar Description - MAX7036_10 |
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