SOT-23 ADC Draws Just 175 µA In Active Mode

With typical standby and active currents of 5 nA and 175 µA, respectively, the MCP3221 12-bit, a/d converter with I2C interface in a SOT-23 package is suitable for low power operation in remote, portable, or battery powered applications. The device is a successive approximation (SAR) converter with a two-wire serial interface that delivers sample rates up to 22.3 ksamples/s. Other features include single 2.7V to 5.5V supply operation, on-board sample and hold circuitry, and self-timed conversions. The device’s SAR architecture uses an internal sample and hold capacitor to store the analog input while the conversion is taking place. Price is $1.18 each/1,000. MICROCHIP TECHNOLOGY INC., Chandler, AZ. (480) 792-7668.