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M62301SP Datasheet(PDF) 7 Page - Renesas Technology Corp |
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M62301SP Datasheet(HTML) 7 Page - Renesas Technology Corp |
7 / 12 page M62301SP/FP REJ03D0861-0300 Rev.3.00 Mar 25, 2008 Page 7 of 11 2. 4-channel 12-bit A/D converter system Separate power supplies to analog section and digital section, analog input voltage range mode wider up to VDD, external reference voltage for integration. To microcomputer 5 V power supply To microcomputer 5 V power supply To microcomputer control pin To counter To RESET Input analog voltage 8 V 2.5 V 10 k 24 k 10 k II = 50 µA 50 µA CINT 680 pF CREF RI CI 6800 pF 4700 pF 4 1 2 3 5 17 20 19 18 16 6 7 15 14 813 912 10 11 A3 A1 A2 A4 VDD Note: CREF: To stabilize reference voltage, be sure to connect capacitance of approximately 4700 pF. CINT: We suggest that this capacitance be connected to prevent malfunction due to noise. Use CI that leaks as slight current as possible. To prevent leak to the circuit board, we recommend providing guard ring (7), (9). Because separate power supplies are provided for the analog are digital sections, the M62301 has two supply voltage VCC and VDD, enabling a wide analog input voltage range VIA. The upper limit of the range is required to be no more than the difference between VCC – 2.5 V as well as VDD, therefore, the analog input voltage range in this application is 0 V to 5 V. When the counter clock frequency is 8 MHz, resolution is; 1 8 M ≈ 212 50 µA (5 + 0.13) 6800 pF × An A/D converter system with resolution of approximately 12 bits can be formed. |
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