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LTC1292DIN8 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1292DIN8 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC1292/LTC1297 12927fb FEATURES DESCRIPTIO KEY SPECIFICATIO S TYPICAL APPLICATIO Single Chip 12-Bit Data Acquisition Systems s Resolution: 12 Bits s Fast Conversion Time: 12 µs Max Over Temp s Low Supply Current: 6.0mA s Shutdown Supply Current: 5 µA (LTC1297) s Single Supply 5V Operation s Power Shutdown After Each Conversion (LTC1297) s Built-In Sample-and-Hold s 60kHz Maximum Throughput Rate (LTC1292) s Direct 3-Wire Interface to Most MPU Serial Ports and All MPU Parallel Ports s Analog Inputs Common Mode to Supply Rails The LTC ®1292/LTC1297 are data acquisition systems that contain a 12-bit, switched-capacitor successive approxi- mation A/D, a differential input, sample-and-hold on the (+) input, and serial I/O. When the LTC1297 is idle between conversions it automatically powers down reducing the supply current to 5 µA, typically. The LTC1292 is capable of digitizing signals at a 60kHz rate and with the device’s excellent AC characteristics, it can be used for DSP appli- cations. All these features are packaged in an 8-pin DIP and are made possible using LTCMOSTM switched-capaci- tor technology. 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 wires. Because of their accuracy, ease of use and small package size these devices are well suited for digitizing analog signals in remote applications where minimum number of interconnects and power consumption are important. 12-Bit Differential Input Data Acquisition System + – DIFFERENTIAL INPUTS COMMON MODE RANGE 0V TO 5V* 1N4148 VREF DOUT CLK VCC LTC1297 +IN GND CS –IN LT1027 4.7 µF TANTALUM 8V TO 40V 1 µF 22 µF TANTALUM DO MC68HC11 SCK MISO *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 ANY INPUT IS OVERVOLTAGED (VIN < GND OR VIN > VCC). SEE SECTION ON OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION. LTC1292/7 TA01 5V + + fSAMPLE (Hz) 10 100 1000 10000 1 100 10k LTC1297• TA02 1 10 1k 100k Power Supply Current vs Sampling Frequency , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is trademark of Linear Technology Corporation |
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