The TC3403 is a low cost, low power analog-to-digital converter based on Microchip’s Sigma-Delta technology. It will perform 16-bit conversions (15-bit plus sign) at up to eight per second. The TC3403 is optimized for use as a microcontroller peripheral in low cost, battery operated systems. A voltage reference is included, or an external reference can be used. A VDD monitor with reset generator provides Power-On Reset and Brown-out protection while an extra threshold detector is suitable for use as an early warning power fail detector, or as a wake-up timer. The TC3403’s 2-wire MicroPort™ digital interface is used for starting conversions and for reading out the data. Driving the SCLK line low starts a conversion. After the conversion starts, each additional falling edge (up to six) detected on SCLK for t4 seconds reduces the A/D resolution by one bit and cuts conversion time in half. after a conversion is completed, clocking the SCLK line puts the MSB through LSB of the resulting data word onto the SDAT line, much like a shift register. The part automatically sleeps when not performing a data conversion. The TC3403 is available in 16-Pin PDIP and 16-Pin QSOP packages.

Please consider this device MCP3424

- 16-Bit Resolution at Eight Conversions Per Second,
  Adjustable Down to 10-Bit Resolution at 512
  Conversions Per Second
- 1.8V – 5.5V Operation
     Low Power Operating...............280µA
     Sleep...............93µA
- Four Single Ended Inputs with Built-In Multiplexer
- MicroPort™ Serial Bus Requires Only Two Interface Lines
- Uses Internal or External Reference
- VDD Monitor and Reset Generator Operational
   in Shutdown Mode
- Early Warning Power Fail Detector, Also Suitable
  as Wake-Up Timer Operational in Shutdown Mode
- Automatically Enters Sleep Mode When Not In Use