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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M41T00AUD датащи(PDF) 28 Page - STMicroelectronics |
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M41T00AUD датащи(HTML) 28 Page - STMicroelectronics |
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28 / 42 page  Audio section operation M41T00AUD 28/42 Doc ID 13480 Rev 5 7 Audio section operation The audio section is comprised of five main parts. The input includes a summing amplifier. A minimum 10 k Ω feedback resistor is required. With that and 20 kΩ input resistors, the input signals will be summed at unity gain. An audio switch follows the amplifier. A tone, selectable between 256 and 512 Hz, can be inserted into the audio stream in lieu of the input amplifier's output. A low pass filter is next with a cut off of 8 kHz. To get a band pass with a 100 Hz low end, the user should place an appropriate coupling capacitor at the input pin. Figure 16. Audio section diagram BPF 100 Hz - 8 kHz 256 Hz 512 Hz 256/512 SELECT TONE ON/OFF From internal RTC timing chain register bits Sum multiple audio signals through external resistors, but single input Switch 256/512 signal in place of audio signal GAIN, 3 dB steps, –33 dB to +12 dB (4-bit register) 300 mW VDD VDD 2 VDD 2 VBIAS AOUT+ AOUT– AIN Low end of band pass filter is actually implemented by blocking capacitor at input pin. Only the high end (low-pass section) is implemented at this point in the audio section. FBK R1x R2 should be a minimum Set R1’s to 2x R2 for unity gain 1 µF ai13328 SIN |
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