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MCP3008T Datasheet(PDF) 18 Page - Microchip Technology

Part No. MCP3008T
Description  2.7V 4-Channel/8-Channel 10-Bit A/D Converters with SPI Serial Interface
Download  40 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP3008T Datasheet(HTML) 18 Page - Microchip Technology

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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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