• 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 I2C address bits of the MCP3422 are programmed at the factory during production.

The MCP3422 and MCP3423 devices have two differential input channels and the MCP3424 has four-differential input channels. All electrical properties of these three devices are the same except the differences in the number of input channels and I2C address bit selection options.

The MCP3422 is available in 8-pin SOIC, DFN, and MSOP packages. The MCP3423 is available in 10-pin DFN, and MSOP packages. The MCP3424 is available in 14-pin SOIC and TSSOP packages.

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