MCP3551/3 DataSheet

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  Low-Power Single Channel 22-Bit Delta Sigma ADCs


The Microchip Technology Inc. MCP355X devices are 2.7V to 5.5V low-power, 22-bit delta-sigma A/D converters. The devices offer output noise as low as 2.5 µVrms with a total unadjusted error of less than 10 ppm. The family exhibits less than 6 ppm integral non-linearity (INL) error, 3 µV offset error, and 2 ppm full scale error. The MCP355X devices provide high accuracy and low noise performance for applications where sensor measurements such as pressure, temperature, and humidity are performed. With the internal oscillator and high oversampling rate, minimal external components are required for high accuracy applications. The fully differential analog inputs make it compatible with a wide variety of sensor and measurement applications. The MCP355X devices operate from -40°C to +125°C and are available in the space-saving 8-pin MSOP and SOIC packages.

Parameter Name  Value
Typical Supply Current (µA)  120
Typical INL (ppm)  2
Max Sample Rate (samples/sec)  14
Input Type  1 Differential  
Interface  SPI
Resolution (bits)  22
Supply Voltage Range (V)  2.7 to 5.5

     Features
22-bit ADC with automatic internal offset and gain calibration
Low output noise 2.5 µVrms
3 µV offset error
2 ppm typical full-scale error
6 ppm maximum INL error
Total unadjusted error less than 10 ppm
Sample rate 13.75 sps
No digital filter settling time, single command conversions through 3-wire SPI™ interface
Low conversion current
    100 µA typical (VDD = 2.7V)
    120 µA typical (VDD = 5.0V)
8-pin MSOP and SOIC packages
Differential inputs with VSS to VDD common mode range
2.7V to 5.5V single supply operation
Extended temperature range: -40°C to +125°C


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