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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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FS9701B датащи(PDF) 22 Page - Fortune Semiconductor Corp. |
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FS9701B датащи(HTML) 22 Page - Fortune Semiconductor Corp. |
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22 / 46 page  FS970X Rev. 4.4 22/46 Operation Amplifier and Comparator The block composed by operation amplifier and comparator include AC buffer block, full-wave rectifiers block, and comparator block. ACDIV ACBUF ACEN 90 k 10 k ACDIV BPACBF CMPH ACBO AGND 38 37 Graph 6. AC buffer block. As shown in Graph 6, buffer block is controlled by ACBUF and ACDIV. It becomes a gain network when connecting with an external resistor. Whether ACBUF works or not can be directly controlled by ACEN. When ACEN=0, it turns off the buffer and the output becomes high impedance. Signal enters through CMPH, and flows out from ACBO or the 37th pin ACB. ACDIV can at the same time controls the gain. If ACDIV=0, the gain of the buffer is 1. If ACDIV=1, the gain of the buffer is determined by the external network resistor. In Typical Application Circuit, the gain becomes 10. When the gain is 1, the 100 kHz side wave flowing through the buffer will be reduced to lower than 0.5%. The bandwidth of AC is limited by the frequency response of full-wave rectifier. If the signal bandwidth is higher than100 kHz, let BPACBF=1, it will change the output source to the 38th pin (ACA) instead of AC buffer. EXTD EXTD 15 k RCTOP RCTEN 15 k 12.3k RCTP RCTN RCTO ACLO ACHO 38 40 41 43 42 Graph 7. Full-wave rectifier switch block ` |
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