Microchip MCP3002-I/SN, 10 bit Serial ADC, Differential Input, 8-Pin SOIC

A perfect solution from having to use an Arduino with your Raspberry.

Raspberry User's

An analog-to-digital converter (ADC) is an important component of many projects as it allows you to read an analog voltage signal and convert it to a value usable by your Python code. This is most commonly used to read sensors that return a range of values, anything from a volume knob (0-10) to a temperature sensor (0-100 degrees). READ MORE

Specifications
Resolution 10 bit
Number of ADCs 1
Digital Interface Type Serial (SPI)
Mounting Type Surface Mount
Sampling Rate 200ksps
Architecture SAR
Typical Single Supply Voltage 5 V
Package Type SOIC
Pin Count 8
Input Signal Type Pseudo Differential, Single Ended

Data Sheet