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LTC1290 - Single Chip 12-Bit Data Acquisition System

The LTC®1290 is a data acquisition component which contains 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 8-channel 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 LTC1290 is idle it can be powered down with a serial word in applications where low power consumption is desired.

The serial I/O is designed to be compatible with industry standard full duplex serial interfaces. It allows either MSB- or LSB-first data and automatically provides 2's complement output coding in the bipolar mode. The output data word can be programmed for a length of 8, 12 or 16 bits. This allows easy interface to shift registers and a variety of processors.

Features Software Programmable Features-Unipolar/Bipolar Conversion-Four Differential/Eight Single Ended Inputs-MSB or LSB First Data Sequence-Variable Data Word Length-Power Shutdown Built-In Sample-and-Hold Single Supply 5V or ±5V Operation Direct Four Wire Interface to Most MPU Serial Ports and All MPU Parallel Ports 50kHz Maximum Throughput Rate Available in 20-Lead PDIP and SO Wide Packages Typical Application

Applications Resolution: 12 Bits Fast Conversion Time: 13µs Max Over Temp Low Supply Current: 6.0mA Packaging