Microchip Technology MCP3426, MCP3427, & MCP3428 16-Bit ADCs

Microchip Technology MCP3426, MCP3427, and MCP3428 16-Bit ADCs are low noise, high accuracy, Delta-Sigma (ΔΣ) Analog-to-Digital Converters with an I²C interface and onboard reference. 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 for the differences in the number of input channels and I²C address bit selection options.

The onboard 2.048V reference voltage enables an input range of ±2.048V differentially (full-scale range =4.096/PGA). These devices can output analog-to-digital conversion results with rates of 15 (16-bit mode), 60 (14-bit mode), or 240 (12-bit mode) Samples per Second (SPS). The rate is based on the user-controllable configuration bit settings. Users can specify the settings with the two-wire I²C serial interface. During each conversion, these Analog-to-Digital Converters calibrate offset and gain errors automatically. This provides accurate conversion results from conversion to conversion over variations in temperature and power supply fluctuations.

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.

Features

16-Bit Resolution with Differential Inputs
- 2 Channel MCP3426 and MCP3427
- 4 Channel MCP3428
On-Board Voltage Reference (V_REF)
- Accuracy 2.048V ± 0.05%
- Drift 15 ppm/°C
On-Board Programmable Gain Amplifier (PGA) Gains of 1, 2, 4, 8
Programmable Data Rate Options
- 15 SPS (16-Bits)
- 60 SPS (14-Bits)
- 240 SPS (12-Bits)
10ppm of Full-Scale Range (FSR)
One-Shot or Continuous Conversion Options

Typical Current Consumption (V_DD = 3V)
- Continous Conversion 135µA
- One-Shot Conversion with 1 SPS
  - 16-Bit Mode 9.0µA
  - 14-Bit Mode 2.25µA
  - 12-Bit Mode 0.56µA
One-Shot or Continuous Conversion Options
I²C Interface
- Standard (100kHz), Fast (400kHz), and High Speed (3.4MHz) 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

Applications

Weigh Scales and Battery Fuel Gauges
Portable Instrumentation
Temperature Sensing with Resistance Temperature Detectors (RTDs), Thermistors, and Thermocouples