MCP3421 datasheet(1/42 Pages) MICROCHIP

部件名	MCP3421

功能描述	18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference

PDF	42 Pages

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制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

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1 / 42 page

DS22003E-page 1

MCP3421

Features

• 18-bit

ΔΣ ADC in a SOT-23-6 package

• Differential Input Operation

• Self Calibration of Internal Offset and Gain Per

Each Conversion

• On-Board Voltage Reference:

- Accuracy: 2.048V ± 0.05%

- Drift: 15 ppm/°C

• On-Board Programmable Gain Amplifier (PGA):

- Gains of 1,2, 4 or 8

• On-Board Oscillator

• INL: 10 ppm of FSR (FSR = 4.096V/PGA)

• 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:

- 145 µA typical

(VDD= 3V, Continuous Conversion)

- 39 µA typical

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

• Supports I2C Serial Interface:

- Standard, Fast and High Speed Modes

• Single Supply Operation: 2.7V to 5.5V

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

Typical Applications

• Portable Instrumentation

• Weigh Scales and Fuel Gauges

• Temperature Sensing with RTD, Thermistor, and

Thermocouple

• Bridge Sensing for Pressure, Strain, and Force.

Package Types

Description

The MCP3421 is a single channel low-noise, high

accuracy

ΔΣ A/D converter with differential inputs and

up to 18 bits of resolution in a small SOT-23-6 package.

The on-board precision 2.048V reference voltage

enables an input range of ±2.048V differentially

(

Δ voltage = 4.096V). The device uses a two-wire I2C

compatible serial interface and operates from a single

2.7V to 5.5V power supply.

The MCP3421 device performs conversion at rates of

3.75, 15, 60, or 240 samples per second (SPS)

depending on the user controllable configuration bit

settings using the two-wire I2C serial interface. This

device has an on-board programmable gain amplifier

(PGA). The user can select the PGA gain of x1, x2, x4,

or x8 before the analog-to-digital conversion takes

place. This allows the MCP3421 device to convert a

smaller input signal with high resolution. The device

has two conversion modes: (a) Continuous mode and

(b) One-Shot mode. In One-Shot mode, the device

enters a low current standby mode automatically after

one conversion. This reduces current consumption

greatly during idle periods.

The MCP3421 device can be used for various high

accuracy analog-to-digital data conversion applications

where design simplicity, low power, and small footprint

are major considerations.

Block Diagram

1

2

3

4

5

6

VIN+

VSS

SCL

VIN-

VDD

SDA

MCP3421

SOT-23-6

VSS

VDD

VIN+

VIN-

SCL

SDA

Voltage Reference

Clock

(2.048V)

I2C Interface

Gain = 1, 2, 4, or 8

VREF

ΔΣ ADC

Converter

PGA

Oscillator

18-Bit Analog-to-Digital Converter

with I2C Interface and On-Board Reference

类似零件编号 - MCP3421

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
	MCP3421A0T-E/OT	1Mb / 30P	18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference 2006
	MCP3421A1T-E/OT	1Mb / 30P	18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference 2006
	MCP3421A2T-E/OT	1Mb / 30P	18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference 2006
	MCP3421A3T-E/OT	1Mb / 30P	18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference 2006

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