LTC1283 3V Single Chip 10-Bit Data Acquisition System UFEATUSREDESCRIPTIO ■ Single Supply 3.3V or ±3.3V Operation The LTC1283 is a 3V data acquisition component which ■ Software Programmable Features: contains a serial I/O successive approximation A/D con- Unipolar/Bipolar Conversions verter. It uses LTCMOSTM switched capacitor technology 4 Differential/8 Single-Ended Inputs to perform either 10-bit unipolar, or 9-bit plus sign bipolar MSB- or LSB-First Data Sequence A/D conversions. The 8-channel input multiplexer can be Variable Data Word Length configured for either single-ended or differential inputs (or ■ Built-In Sample-and-Hold combinations thereof). An on-chip sample-and-hold is ■ Direct 4-Wire Interface to Most MPU Serial Ports included for all single-ended input channels. and all MPU Parallel Ports The serial I/O is designed to be compatible with industry- ■ 15kHz Maximum Throughput Rate standard full-duplex serial interfaces. It allows either MSB- U or LSB-first data and automatically provides 2’s comple- KEY SPECIFICATIO S ment output coding in the bipolar mode. The output data ■ Minimum Guaranteed Supply Voltage: 3V word can be programmed for a length of 8-, 10-, 12-, or ■ Resolution: 10 Bits 16-bit. This allows easy interface to shift registers and a ■ Offset Error: ±0.5LSB Max variety of processors. ■ Linearity Error: ±0.5LSB Max Both the LTC1283A and LTC1283 are specified with offset ■ Gain Error (LTC1283A): ±1LSB Max and linearity errors less than ±0.5LSB. The LTC1283A has ■ Conversion Time: 44μs a gain error limit of ±1LSB. The 1283 is specified with a ■ Supply Current: 350μA Max, 150μA Typ gain error limit of ±2LSB for applications where gain is , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. adjustable or less critcial. LTCMOS is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. OUTYPICAL APPLICATI 4.7μF FOR 83CL410 CODE SEE 3V Linearity Plot APPLICATIONS INFORMATION SECTION 1.0 LTC1283 MPU (e.g., 83CL410) DIFFERENTIAL INPUT 0.5 3V BIPOLAR INPUT 0 –3V 3V ERROR (LSBs) D P1.1 OUT D P1.2 IN –0.5 SCLK P1.3 T UNIPOLAR CS P1.4 INPUTS SERIAL DATA LINK – 1.0 0 512 1024 OUTPUT CODE LTC1283 • TA02 (+) –UNIPOLAR (–) INPUT –3V LTC1283 • TA01 1283fb 1
