LTC1289

LTC1289 3 Volt Single Chip 12-Bit Data Acquisition System + U U FEATURES ■ Single Supply 3.3V or ±3.3V Operation ■ Software Programmable Features Unipolar/Bipolar Conversions 4 Differential/8 Single-Ended Inputs Variable Data Word Length Power Shutdown ■ Built-In Sample-and-Hold ■ Direct 4-Wire Interface to Most MPU Serial Ports and All MPU Parallel Ports ■ 25kHz Maximum Throughput Rate ■ Available in 20-Lead PDIP and 20-Lead SW Packages U APPLICATIO S ■ Minimum Guaranteed Supply Voltage: 2.7V ■ Resolution: 12 Bits ■ Fast Conversion Time: 26µs Max Over Temp ■ Low Supply Currents: 1.0mA DESCRIPTIO The LTC®1289 is a 3V data acquisition component which contains a serial I/O successive approximation A/D converter. The device specifications are guaranteed at a supply voltage of 2.7V. It uses LTCMOSTM switched capacitor technology to perform a 12-bit unipolar, or 11-bit plus sign bipolar A/D conversion. 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 LTC1289 is idle it can be powered down 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 b...