MCP3004-I/P 查看數據表（PDF） - Microchip Technology

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MCP3004-I/P

2.7V 4-Channel/8-Channel 10-Bit A/D Converters with SPI Serial Interface

Microchip Technology 

MCP3004/3008

RSS CHx

VA

VDD

VT = 0.6V

CPIN

7 pF

VT = 0.6V

ILEAKAGE

±1 nA

Sampling

Switch

SS RS = 1 kΩ

CSAMPLE

= DAC capacitance

= 20 pF

VSS

Legend

VA = Signal Source

RSS = Source Impedance

CHx = Input Channel Pad

CPIN = Input Pin Capacitance

VT = Threshold Voltage

ILEAKAGE = Leakage Current At The Pin

Due To Various Junctions

SS = sampling switch

RS = sampling switch resistor

CSAMPLE = sample/hold capacitance

FIGURE 4-1:

Analog Input Model.

4

VDD = VREF = 5 V

fSAMPLE = 200 ksps

3

2

1

0

100

VDD = VREF = 2.7 V

fSAMPLE = 75 ksps

1000

Input Resistance (Ohms)

10000

FIGURE 4-2:

Maximum Clock Frequency

vs. Input resistance (RS) to maintain less than a

0.1 LSB deviation in INL from nominal

conditions.

DS21295D-page 18

© 2008 Microchip Technology Inc.

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