LTC1090 Single Chip 10-Bit Data Acquisition System UFEATURESDESCRIPTIO ■ Software Programmable Features: The LTC®1090 is a data acquisition component which Unipolar/Bipolar Conversions contains a serial I/O successive approximation A/D con- 4 Differential/8 Single Ended Inputs verter. It uses LTCMOSTM switched capacitor technology MSB or LSB First Data Sequence to perform either 10-bit unipolar, or 9-bit plus sign bipolar Variable Data Word Length A/D conversions. The 8-channel input multiplexer can be ■ Built-In Sample and Hold configured for either single ended or differential inputs (or ■ Single Supply 5V, 10V or ±5V Operation combinations thereof). An on-chip sample and hold is ■ Direct 4 Wire Interface to Most MPU Serial Ports and included for all single ended input channels. All MPU Parallel Ports The serial I/O is designed to be compatible with industry ■ 30kHz Maximum Throughput Rate standard full duplex serial interfaces. It allows either MSB or LSB first data and automatically provides 2’s UKEY SPECIFICATIO S complement output coding in the bipolar mode. The output data word can be programmed for a length of 8, 10, ■ Resolution: 10 Bits 12 or 16 bits. This allows easy interface to shift registers ■ Total Unadjusted Error (LTC1090A): ±1/2LSB Max and a variety of processors. ■ Conversion Time: 22µs ■ Supply Current: 2.5mA Max, 1.0mA Typ The LTC1090A is specified with total unadjusted error (including the effects of offset, linearity and gain errors) , LTC and LT are registered trademarks of Linear Technology Corporation. less than ±0.5LSB. LTCMOS is a trademark of Linear Technology Corp. The LTC1090 is specified with offset and linearity less than ±0.5LSB but with a gain error limit of ±2LSB for applications where gain is adjustable or less critical. UTYPICAL APPLICATIO FOR 8051 CODE SEE APPLICATIONS INFORMATION SECTION LTC1090 MPU (e.g., 8051) Linearity Plot DIFFERENTIAL INPUT 1.0 5V BIPOLAR INPUT 0.5 5V –5V D P1.1 0.0 OUT D P1.2 IN ERROR (LSBs) T SCLK P1.3 – 0.5 UNIPOLAR INPUTS CS P1.4 SERIAL DATA LINK –1.0 0 512 1024 OUTPUT CODE LTC1090 • TA02 (+) – UNIPOLAR (–) INPUT LTC1090 • TA01 –5V 1090fc 1
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