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LTC1289 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1289 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC1289 3 Volt Single Chip 12-Bit Data Acquisition System S FEATURE DESCRIPTIO s Single Supply 3.3V or ±3.3V Operation s Software Programmable Features Unipolar/Bipolar Conversions 4 Differential/8 Single-Ended Inputs Variable Data Word Length Power Shutdown s Built-In Sample and Hold s Direct 4-Wire Interface to Most MPU Serial Ports and all MPU Parallel Ports s 25kHz Maximum Throughput Rate APPLICATI TYPICAL Single Cell 3V 12-Bit Data Acquisition System KEY SPECIFICATIO S s Minimum Guaranteed Supply Voltage ............... 2.7V s Resolution ...................................................... 12 Bits s Fast Conversion Time .............. 26 µs Max Over Temp s Low Supply Currents ...................................... 1.0mA The LTC1289 is a 3V data acquisition component which contains a serial I/O successive approximation A/D con- verter. The device specifications are guaranteed at a supply voltage of 2.7V. It uses LTCMOS TM switched ca- pacitor technology to perform a 12-bit unipolar, or 11-bit plus sign bipolar A/D conversion. The 8 channel input multiplexer can be configured for either single-ended or differential inputs (or combinations thereof). An on-chip sample and hold is included for all single-ended input channels. When the LTC1289 is idle it can be powered down in applications where low power consumption is desired. The serial I/O is designed to be compatible with industry standard full duplex serial interfaces. It allows either MSB- or LSB- first data and automatically provides 2’s comple- ment output coding in the bipolar mode. The output data word can be programmed for a length of 8, 12 or 16 bits. This allows easy interface to shift registers and a variety of processors. LTCMOS TM is a trademark of Linear Technology Corporation LTC1289 TA01 LTC1289 1N4148 10 µF – + 10 Ω 1/4 LTC1079 +3V –3V TO AND FROM MPU + 22 µF TANTALUM 1N4148 10k + LT1004-1.2 0.1 µF 22 µF 1N5817 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM DGND VCC ACLK SCLK DIN DOUT CS REF+ REF– V– AGND BOOST CAP+ GND CAP– V+ OSC LV VOUT LTC1044 10 µF + 22 µF –3V 3V LITHIUM FOR OVERVOLTAGE PROTECTION ON ONLY ONE CHANNEL LIMIT THE INPUT CURRENT TO 15mA. FOR MORE THAN ONE CHANNEL LIMIT THE INPUT CURRENT TO 7mA PER CHANNEL AND 28mA FOR ALL CHANNELS. CONVERSION RESULTS ARE NOT VALID WHEN THE SELECTED OR ANY OTHER CHANNEL IS OVERVOLTAGED (VIN < V – or VIN > VCC). |
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