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MCP3008T Datasheet(PDF) 18 Page - Microchip Technology |
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MCP3008T Datasheet(HTML) 18 Page - Microchip Technology |
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18 / 40 page  MCP3004/3008 DS21295D-page 18 © 2008 Microchip Technology Inc. FIGURE 4-1: Analog Input Model. FIGURE 4-2: Maximum Clock Frequency vs. Input resistance (RS) to maintain less than a 0.1 LSB deviation in INL from nominal conditions. CPIN VA RSS CHx 7pF VT = 0.6V VT = 0.6V ILEAKAGE Sampling Switch SS RS = 1 kΩ CSAMPLE = DAC capacitance VSS VDD = 20 pF ±1 nA Legend VA = Signal Source ILEAKAGE = Leakage Current At The Pin Due To Various Junctions RSS = Source Impedance SS = sampling switch CHx = Input Channel Pad RS = sampling switch resistor CPIN = Input Pin Capacitance CSAMPLE = sample/hold capacitance VT = Threshold Voltage 0 1 2 3 4 100 1000 10000 Input Resistance (Ohms) VDD = VREF = 5 V fSAMPLE = 200 ksps VDD = VREF = 2.7 V fSAMPLE = 75 ksps |
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