LTC1283

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3V Single Chip 10-Bit Data Acquisition System

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Overview

Single Supply 3.3V or ±3.3V Operation
Software Programmable Features:
- Unipolar/Bipolar Conversions
- 4 Differential/8 Single-Ended Inputs
- MSB- or LSB-First Data Sequence
- Variable Data Word Length
Built-In Sample-and-Hold
Direct 4-Wire Interface to Most MPU Serial Ports and all MPU Parallel Ports
15kHz Maximum Throughput Rate

The LTC1283 is a 3V data acquisition component which contains a serial I/O successive approximation A/D converter. It uses LTCMOS^™switched capacitor technology to perform either 10-bit unipolar, or 9-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.

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-, 10-, 12-, or 16-bit. This allows easy interface to shift registers and a variety of processors.

Both the LTC1283A and LTC1283 are specified with offset and linearity errors less than ±0.5LSB. The LTC1283A has a gain error limit of ±1LSB. The 1283 is specified with a gain error limit of ±2LSB for applications where gain is adjustable or less critcial.

Applications