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PAC1934 数据表(PDF) 13 Page - Microchip Technology |
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PAC1934 数据表(HTML) 13 Page - Microchip Technology |
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13 / 64 page  2017-2019 Microchip Technology Inc. DS20005850E-page 13 PAC1931/2/3/4 Figure 2-31 shows the equivalent circuitry for the input channels of the PAC193X devices. ESD protection diodes include two 40V breakdown diodes. Input leakage current is very low (no DC bias current). The switched capacitor sampling circuits shown as a switch with equivalent series resistance and sampling capacitor. The switches work at 1024 samples per second (SPS) maximum, independent of sampling rate (at 8 SPS, the device is sleeping in between samples). Input impedance for each input is about 32 MΩ. FIGURE 2-31: Equivalent Input Circuits for PAC193X Devices. VSS/GND VSENSE+ VSENSE- 6 k Ω 6 k Ω 29 k Ω 30 pF 30 pF 1.2 pF 40V 1 1 1 40V 1 k Ω 1 1 k Ω |
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