MICROCHIP MCP3426A2-E/SN

The MCP3426, MCP3427 and MCP3428 devices (MCP3426/7/8) are the low noise and high accuracy 16 Bit Delta-Sigma Analog-to-Digital (ΔΣ A/D) Converter family members of the MCP342X series. These devices can convert analog inputs to digital codes with up to 16 bits of resolution. The MCP3426 and MCP3427 devices have two differential input channels and the MCP3428 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. These devices can output analog-to-digital conversion results at rates of 15 (16-bit mode), 60 (14-bit mode), or 240 (12-bit mode) 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 device has an on-board 2.048V reference voltage, which enables an input range of ±2.048V differentially (full scale range = 4.096/PGA). The user can select the gain of the on-board programmable gain amplifier (PGA) using the configuration register bits (gain of x1, x2, x4, or x8). This allows the MCP3426/7/8 devices to convert a very weak input signal with high resolution. The MCP3426/7/8 devices have two conversion modes: (a) One-Shot Conversion mode and (b) Continuous Conversion mode. In the One-Shot conversion mode, the device performs a single conversion and enters a low current standby (shutdown) 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 configured 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 MCP3427 and MCP3428 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 MCP3426 are programmed at the factory during production. The MCP3426 is available in 8-pin SOIC, DFN, and MSOP packages. The MCP3427 is available in 10-pin DFN, and MSOP packages. The MCP3428 is available in 14-pin SOIC and TSSOP packages.

• 16-bit ΔΣ ADC with Differential Inputs: 2 channels: MCP3426 and MCP3427; 4 channels: MCP3428
• 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: 15 SPS (16 bits); 60 SPS (14 bits); 240 SPS (12 bits)
• One-Shot or Continuous Conversion Options
• Low Current Consumption (VDD = 3V): Continuous Conversion: 135 μA typical; One-Shot Conversion with 1 SPS: 9 μA typical for 16 bit mode; 2.25 μA typical for 14 bit mode; 0.56 μA typical for 12 bit mode
• On-Board Oscillator
• I²C Interface: Standard, Fast and High Speed Modes; User configurable two external address selection pins for MCP3427 and MCP3428
• Single Supply Operation: 2.7V to 5.5V
• Extended Temperature Range: -40°C to +125°C

• Portable Instrumentation and Consumer Goods
• Temperature Sensing with RTD, Thermistor, and Thermocouple
• Bridge Sensing for Pressure, Strain, and Force
• Weigh Scales and Battery Fuel Gauges
• Factory Automation Equipment