LTC1290

LTC1290 Single Chip 12-Bit Data Acquisition System U U 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 U KEY SPECIFICATIO S ■ Resolution: 12 Bits ■ Fast Conversion Time: 13µs Max Over Temp ■ Low Supply Current: 6.0mA DESCRIPTIO The LTC®1290 is a data acquisition component which contains a serial I/O successive approximation A/D converter. It uses LTCMOSTM 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 MSBor 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 a...