MAX1270 multirange, 12-bit A/D converter is an excellent addition to your Stamp PLC.

Features:

• 12-Bit Resolution, 1/2LSB Linearity
• +5V Single-Supply Operation
• SPI/QSPI and MICROWIRE-Compatible 3-Wire Interface
• Eight Analog Input Channels
• 110ksps Sampling Rate
• Two Power-Down Modes
• Internal or External Clock
• 24-Pin Narrow DIP or 28-Pin SSOP Packages

Key Specifications:

• Power requirements: -0.3V to +6 VDC
• Communication: SPI/QSPI and MICROWIRE
• Dimensions: 1.14 X0.3 X 0.2 in (32.1 X 7.6 X 5.08 mm)
• Operating temp range: +32 to +158 °F (0°C to +70 °C)

Downloads & Resources:
MAX1270 12-bit A/D Datasheet (.pdf)