MCP3204 View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

MCP3204

2.7V 4-Channel/8-Channel 12-Bit A/D Converters with SPI® Serial Interface

Microchip Technology 

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MCP3204/3208

RS CHx

VA

VDD

VT = 0.6V

CPIN

7pF

VT = 0.6V

ILEAKAGE

± 1 nA

Legend

VA = Signal Source

RS = Source Impedance

CHx = Input Channel Pad

CPIN = Input Capacitance

VT = Threshold Voltage

ILEAKAGE = Leakage Current at the pin

due to various junctions

SS = Sampling Switch

RSS = Sampling Switch Resistor

CSAMPLE = Sample/Hold Capacitance

FIGURE 4-1: Analog Input Model

2.5

VDD = 5V

2.0

1.5

1.0

VDD = 2.7V

0.5

0.0

100

1000

Input Resistance (Ohms)

10000

FIGURE 4-2: Maximum Clock Frequency vs. Input

resistance (RS) to maintain less than a 0.1LSB

deviation in INL from nominal conditions.

Sampling

Switch

SS RSS = 1kΩ

CSAMPLE

= DAC capacitance

= 20 pF

VSS

© 1999 Microchip Technology Inc.

Preliminary

DS21298B-page 13

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