MCP3221 Low-Power 12-Bit A/D Converter with I2C Interface
Microchip’s MCP3221 is a successive approximation
A/D converter (ADC) with a 12-bit resolution. Available
in the SOT-23 package, this device provides one single-ended input with very low-power consumption.
Based on an advanced CMOS technology, the
MCP3221 provides a low maximum conversion current
and standby current of 250 µA and 1 µA, respectively.
Low-current consumption, combined with the small
SOT-23 package, make this device ideal for batterypowered and remote data acquisition applications.
Communication to the MCP3221 is performed using a
2-wire, I2C compatible interface. Standard (100 kHz)
and Fast (400 kHz) I2C modes are available with the
device. An on-chip conversion clock enables
independent timing for the I2C and conversion clocks.
The device is also addressable, allowing up to eight
devices on a single 2-wire bus.
The MCP3221 runs on a single-supply voltage that
operates over a broad range of 2.7V to 5.5V. This
device also provides excellent linearity of ±1 LSB
differential nonlinearity (DNL) and ±2 LSB integral
nonlinearity (INL), maximum.