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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.

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.