3V Single Chip 10-Bit Data Acquisition System

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

* Minimum Guaranteed Supply Voltage: 3V

* Resolution: 10 Bits

* Offset Error: ±0.5LSB Max

* Linearity Error: ±0.5LSB Max

* Gain Error (LTC1283A): ±1LSB Max

* Conversion Time: 44μs

* Supply Current: 350µA Max, 150µA Typ

* 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