LTC1291 Single Chip 12-Bit Data Acquisition System UFEATURESDESCRIPTIO ■ Built-In Sample-and-Hold The LTC®1291 is a data acquisition system that contains ■ Single Supply 5V Operation a serial I/O successive approximation A/D converter. It ■ Power Shutdown uses LTCMOSTM switched capacitor technology to per- ■ Direct 3- or 4-Wire Interface to Most MPU Serial form a 12-bit unipolar A/D conversion. The input multi- Ports and All MPU Parallel Ports plexer can be configured for either single-ended or differ- ■ Two-Channel Analog Multiplexer ential inputs. An on-chip sample-and-hold is included on ■ Analog Inputs Common Mode to Supply Rails the “+” input. When the LTC1291 is idle, it can be powered ■ 8-Pin DIP Package down in applications where low power consumption is desired. An external reference is not required because the U LTC1291 takes its reference from the power supply (VCC). KEY SPECIFICATIO S All these features are packaged in an 8-pin DIP. ■ Resolution: 12 Bits The serial I/O is designed to communicate without external ■ Fast Conversion Time: 12µs Max Over Temp. hardware to most MPU serial ports and all MPU parallel ■ Low Supply Current: I/O ports allowing data to be transmitted over three or four 6.0mA (Typ) Active Mode wires. Given the accuracy, ease of use and small package 10µA (Max) Shutdown Mode size, this device is well suited for digitizing analog signals in remote applications where minimum number of inter- connects, small physical size, and low power consump- tion are important. , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOSTM is a trademark of Linear Technology Corporation UTYPICAL APPLICATIO2-Channel 12-Bit Data Acquisition System 22µF 5V Channel-to-Channel TANTALUM + INL Matching 0.5 0.4 0.3 CS VCC(VREF) DO 0.2 0.1µF 0.1 CH0 CLK SCK 0 2-CHANNEL LTC1291 MC68HC11 MUX* DELTA (LSB) –0.1 CH1 DOUT MISO –0.2 –0.3 GND DIN MOSI –0.4 1291 TA01 –0.5 0 512 1024 1536 2048 2560 3072 3584 4096 *FOR OVERVOLTAGE PROTECTION, LIMIT THE INPUT CURRENT TO 15mA CODE PER PIN OR CLAMP THE INPUTS TO VCC AND GND WITH 1N4148 DIODES. CONVERSION RESULTS ARE NOT VALID WHEN THE SELECTED CHANNEL OR 1291 TA02 THE OTHER CHANNEL IS OVERVOLTAGED (VIN < GND OR VIN > VCC). SEE SECTION ON OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION. 1291fa 1
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