MCP3421A0T-E/CH

MCP3421A0T-E/CH is a single channel low-noise, high accuracy ΔΣ A/D converter with differential inputs and up to 18 bits of resolution. The onboard precision 2.048V reference voltage enables an input range of ±2.048V differentially (Δ voltage = 4.096V). 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 analogue-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 application includes portable instrumentation, weigh scales and fuel gauges, temperature sensing with RTD, thermistor, and thermocouple, and bridge sensing for pressure, strain, and force.

• 18bit ΔΣ ADC, differential input operation
• Self calibration of internal offset and gain per each conversion, on-board oscillator
• Output noise is 1.5µVRMS typ at (TA = +25°C, DR = 3.75 SPS, PGA = 1, VIN = 0)
• Integral nonlinearity is 10ppm of FSR at (DR = 3.75 SPS)
• Gain error is 0.05% typical at (PGA = 1, DR = 3.75SPS)
• Offset error is 15µV typ at (tested at PGA = 1, VDD = 5.0V and DR = 3.75 SPS)
• Power supply rejection at DC is 100dB typ at (TA = +25°C, VDD = 2.7V to 5.5V, PGA = 1)
• Supply current during conversion is 155µA typ at (VDD = 5.0V)
• Input leakage current is 1µA maximum at (VIH = 5.5V, TA = -40°C to +85°C)
• Operating temperature range from -40°C to +125°C, 6-lead SOT-23 package