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LTC1291 Folha de dados(PDF) 1 Page - Linear Technology |
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LTC1291 Folha de dados(HTML) 1 Page - Linear Technology |
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1 / 20 page  1 LTC1291 1291fa The LTC ®1291 is a data acquisition system that contains a serial I/O successive approximation A/D converter. It uses LTCMOS TM switched capacitor technology to per- form a 12-bit unipolar A/D conversion. The input multi- plexer can be configured for either single-ended or differ- ential inputs. An on-chip sample-and-hold is included on the “+” input. When the LTC1291 is idle, it can be powered down in applications where low power consumption is desired. An external reference is not required because the LTC1291 takes its reference from the power supply (VCC). All these features are packaged in an 8-pin DIP. The serial I/O is designed to communicate without external hardware to most MPU serial ports and all MPU parallel I/O ports allowing data to be transmitted over three or four wires. Given the accuracy, ease of use and small package 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. LTCMOS TM is a trademark of Linear Technology Corporation , LTC and LT are registered trademarks of Linear Technology Corporation. FEATURES DESCRIPTIO KEY SPECIFICATIO S TYPICAL APPLICATIO Single Chip 12-Bit Data Acquisition System s Built-In Sample-and-Hold s Single Supply 5V Operation s Power Shutdown s Direct 3- or 4-Wire Interface to Most MPU Serial Ports and All MPU Parallel Ports s Two-Channel Analog Multiplexer s Analog Inputs Common Mode to Supply Rails s 8-Pin DIP Package s Resolution: 12 Bits s Fast Conversion Time: 12 µs Max Over Temp. s Low Supply Current: 6.0mA (Typ) Active Mode 10 µA (Max) Shutdown Mode 5V CH0 GND DIN DOUT CLK VCC(VREF) CS LTC1291 2-CHANNEL MUX* CH1 0.1 µF 22 µF TANTALUM *FOR OVERVOLTAGE PROTECTION, LIMIT THE INPUT CURRENT TO 15mA PER PIN OR CLAMP THE INPUTS TO VCC AND GND WITH 1N4148 DIODES. CONVERSION RESULTS ARE NOT VALID WHEN THE SELECTED CHANNEL OR THE OTHER CHANNEL IS OVERVOLTAGED (VIN < GND OR VIN > VCC). SEE SECTION ON OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION. 1291 TA01 DO MC68HC11 SCK MISO MOSI CODE 0 –0.5 –0.4 –0.2 –0.1 0 0.5 0.2 1024 2048 2560 1291 TA02 –0.3 0.3 0.4 0.1 512 1536 3072 3584 4096 Channel-to-Channel INL Matching 2-Channel 12-Bit Data Acquisition System |
Nº de peça semelhante - LTC1291_1 |
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Descrição semelhante - LTC1291_1 |
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