Catalog
3 Volt Single Chip 12-Bit Data Acquisition System
Key Features
• Single Supply 3.3V or ±3.3V Operation
• Software Programmable FeaturesUnipolar/Bipolar Conversions4 Differential/8 Single-Ended InputsVariable Data Word LengthPower Shutdown
• 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
Description
AI
The LTC1289 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 LTCMOS™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 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.ApplicationsMinimum Guaranteed Supply Voltage: 2.7VResolution: 12 BitsFast Conversion Time: 26µs Max Over TempLow Supply Currents: 1.0mA