As a nice bonus, it even includes a programmable gain amplifier, up to x16, to help boost up smaller single/differential signals to the full range. We like this ADC because it can run from 2V to 5V power/logic, can measure a large range of signals and it is super easy to use. It is a great general purpose 12-bit converter.

Resolution: 12 Bits
Programmable Sample Rate: 128 to 3300 Samples/Second
Power Supply/Logic Levels: 2.0V to 5.5V
Low Current Consumption: Continuous Mode: Only 150µA Single-Shot Mode: Auto Shut-Down
Internal Low-Drift Voltage Reference
Internal Oscillator
Internal PGA: up to x16
I2C Interface: 4-Pin-Selectable Addresses
Four Single-Ended or 2 Differential Inputs
Programmable Comparator