MCP3421| Datasheet

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MCP3421
18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference
Features
18-bit 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 uA typical (VDD= 3V, Continuous Conversion) - 39 uA 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

Description
The MCP3421 is a single channel low-noise, high accuracy 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 ( 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
VSS VDD

Typical Applications
Portable Instrumentation Weigh Scales and Fuel Gauges Temperature Sensing with RTD, Thermistor, and Thermocouple Bridge Sensing for Pressure, Strain, and Force. Voltage Reference (2.048V) Gain = 1, 2, 4, or 8 VIN+ PGA Top View VIN ADC Converter Clock Oscillator VREF

Package Types
SOT-23-6

VIN+ VSS SCL

1 2 3

6 5 4

VINVDD SDA

I2C Interface

SCL

SDA

2007 Microchip Technology Inc.

DS22003D-page 1

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MCP3421 DATASHEET