LTC1293 Datasheet

• Software Programmable Features:
  • Unipolar/Bipolar Conversion
  • Differential/Single Ended Inputs
  • MSB-First or MSB/LSB Data
• Built-In Sample and Hold
• Single Supply 5V or ±5V Operation
• Direct 4-Wire Interface to Most MPU Serial Ports and All MPU Parallel Ports
• 46.5kHz Maximum Throughput Rate

• Resolution: 12 Bits
• Fast Conversion Time: 12µs Max Over Temp
• Low Supply Current: 6.0mA

The LTC1293 is a family of data acquisition systems which contain a serial I/O successive approximation A/D converter. It uses LTCMOS^™ switched capacitor technology to perform either 12-bit unipolar, or 11-bit plus sign bipolar A/D conversions. The input multiplexer can be configured for either single ended or differential inputs (or combinations thereof). An on-chip sample and hold is included for all single ended input channels. When the LTC1293 is idle it can be powered down in applications where low power consumption is desired. The LTC1296 includes a System Shutdown Output pin which can be used to power down external circuitry, such as signal conditioning circuitry prior to the input mux.

The serial I/O is designed to communicate without external hardware to most MPU serial ports and all MPU parallel I/O ports allowing up to eight channels of data to be transmitted over as few as three wires.