Описание
The MCP3422 device is the low noise and high accuracy 18-Bit delta-sigma analog-to-digital (?S 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.
- 18-bit ?S 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
