MCP3422 datasheet(1/58 Pages) MICROCHIP

部件名	MCP3422

功能描述	18-Bit, Multi-Channel ?誇 Analog-to-Digital Converter with I2C??Interface and On-Board Reference

PDF	58 Pages

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制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

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DS22088C-page 1

MCP3422/3/4

Features

• 18-bit

ΔΣ ADC with Differential Inputs:

- 2 channels: MCP3422 and MCP3423

- 4 channels: MCP3424

• Differential Input Full Scale Range: -VREF to

+VREF

• Self Calibration of Internal Offset and Gain per

Each Conversion

• On-Board Voltage Reference (VREF):

- Accuracy: 2.048V ± 0.05%

- Drift: 15 ppm/°C

• On-Board Programmable Gain Amplifier (PGA):

- Gains of 1, 2, 4 or 8

• INL: 10 ppm of Full Scale Range

• Programmable Data Rate Options:

- 3.75 SPS (18 bits)

- 15 SPS (16 bits)

- 60 SPS (14 bits)

- 240 SPS (12 bits)

• One-Shot or Continuous Conversion Options

• Low Current Consumption:

- 135 µA typical

(VDD= 3V, Continuous Conversion)

- 36 µA typical

(VDD= 3V, One-Shot Conversion with 1 SPS)

• On-Board Oscillator

•I2C™ Interface:

- Standard, Fast and High Speed Modes

- User configurable two external address pins

for MCP3423 and MCP3424

• Single Supply Operation: 2.7V to 5.5V

• Extended Temperature Range: -40°C to +125°C

Typical Applications

• Portable Instrumentation and Consumer Goods

• Temperature Sensing with RTD, Thermistor, and

Thermocouple

• Bridge Sensing for Pressure, Strain, and Force

• Weigh Scales

• Battery Fuel Gauges

• Factory Automation Equipment

Description

The MCP3422, MCP3423 and MCP3424 devices

(MCP3422/3/4) are the low noise and high accuracy

18-Bit delta-sigma analog-to-digital (

ΔΣ A/D) converter

family members of the MCP342X series from Microchip

Technology Inc. These devices can convert analog

inputs to digital codes with up to 18 bits of resolution.

The on-board 2.048V reference voltage enables an

input range of ± 2.048V differentially (full scale

range = 4.096V/PGA).

These devices can output analog-to-digital conversion

results at rates of 3.75, 15, 60, or 240 samples per

second

depending

on

the

user

controllable

configuration bit settings using the two-wire I2C serial

interface.

During

each

conversion,

the

device

calibrates offset and gain errors automatically. This

provides accurate conversion results from conversion

to conversion over variations in temperature and power

supply fluctuation.

The user can select the PGA gain of x1, x2, x4, or x8

before the analog-to-digital conversion takes place.

This allows the MCP3422/3/4 devices to convert a very

weak input signal with high resolution.

The MCP3422/3/4 devices have two conversion

modes: (a) One-Shot Conversion mode and (b)

Continuous Conversion mode. In One-Shot conversion

mode, the device performs a single conversion and

enters a low current standby mode automatically until it

receives another conversion command. This reduces

current consumption greatly during idle periods. In

Continuous conversion mode, the conversion takes

place continuously at the set conversion speed. The

device updates its output buffer with the most recent

conversion data.

The devices operate from a single 2.7V to 5.5V power

supply and have a two-wire I2C compatible serial

interface for a standard (100 kHz), fast (400 kHz), or

high-speed (3.4 MHz) mode.

The I2C address bits for the MCP3423 and MCP3424

are selected by using two external I2C address

selection pins (Adr0 and Adr1). The user can configure

the device to one of eight available addresses by

connecting these two address selection pins to VDD,

VSS or float. The I

2C address bits of the MCP3422 are

programmed at the factory during production.

18-Bit, Multi-Channel

ΔΣ Analog-to-Digital Converter with

I2C™ Interface and On-Board Reference

类似零件编号 - MCP3422

制造商	部件名	数据表	功能描述
Microchip Technology	MCP3421	1Mb / 30P	18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference 2006
	MCP3421	761Kb / 42P	18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference 2009
	MCP3421A0T-E/CH	761Kb / 42P	18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference 2009
	MCP3421A0T-E/OT	1Mb / 30P	18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference 2006
	MCP3421A1T-E/CH	761Kb / 42P	18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference 2009

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类似说明 - MCP3422

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