I have an updated version of this board that offers 12-bit + 12-bit ADCs HERE

The board has been updated to revision 2.3 and has a solder-trace that can be used to select the VREF voltage for the for the MCP3008 10-bit ADC.

This board has (8) 10-Bit channels accessed via SPI, and (4) 12-Bit channels accessed via I2C. It also has a self-healing poly fuse on the 5V line, filter capacitors, and a power LED. It DOES NOT have resistor dividers on any inputs and the MAX input voltage is 5V/6.14V.

Based on the MCP3008 and ADS1015 ADC controller IC:

MCP3008

• 8-Channel
• 200 ksps max. sampling rate at VDD = 5V
• 10-Bits of resolution (when powered with 5V.)
• Analog inputs programmable as single-ended or pseudo-differential pairs
• On-chip sample and hold
• SPI serial interface (modes 0,0 and 1,1)
• Low power CMOS technology
• 5 nA typical standby current, 2 µA max.
• 500 µA max. active current at 5V
• Industrial temp range: -40°C to +85°C
• Adafruit MCP3008 Tutorial

ADS1015

• 12-Bit Noise-Free Resolution
• Wide Supply Range: 2.0 V to 5.5 V
• Low Current Consumption: 150 μA (Continuous-Conversion Mode)
• Programmable Data Rate: 128 SPS to 3.3 kSPS
• Single-Cycle Settling
• Internal Low-Drift Voltage Reference
• Internal Oscillator
• I2C Interface: 2 Selectable Addresses via solder-jumper
• Four Single-Ended or Two Differential Inputs
• Programmable Comparator ADS1015
• Adafruit ADS1015 Tutorial

Board Features:

12 total ADC input Channels:

• 8 channels support 10-bit resolution, 5Vdc MAX
• 4 channels support 12-bit resolution, 6.144Vdc MAX
• All channels support single-ended mode or differential-pair mode (takes 2 channels)

Features

• 3.3V, 5V, and GND connection terminals.
• Board can back-power Raspberry Pi via 5V and GND connection terminals.
• Self-healing poly fuse to prevent overcurrent damage to Raspberry Pi.
• Filter capacitors on 5V input/output line
• Green power LED
• High-quality screw-terminals on all channels (COLOR MAY VARY)
• Hardware or Software SPI, selectable via jumpers.
• SPI can use CEO of CE1, selectable via solder jumper.
• Footprint for EEPROM and supporting passive components to allow you to turn into true rPI HAT (EEPROM and passives optional.)
• Stackable header option.

NOTE: This board ships with all headers un-soldered. Some light soldering is required to connect the headers and connectors. You can optionally elect to have the board shipped to you complete assembled for a nominal fee by selecting the option on the right.

All SMD components are pre-assembled, including the EEPROM and related passive components if you select to add them, regardless of the options selected.