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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM12458CIVX датащи(PDF) 1 Page - National Semiconductor (TI) |
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LM12458CIVX датащи(HTML) 1 Page - National Semiconductor (TI) |
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1 / 36 page  LM12454/LM12458/LM12H458 12-Bit + Sign Data Acquisition System with Self-Calibration General Description The LM12458, and LM12H458 are highly integrated Data Acquisition Systems. Operating on just 5V, they combine a fully-differential self-calibrating (correcting linearity and zero errors) 13-bit (12-bit + sign) analog-to-digital converter (ADC) and sample-and-hold (S/H) with extensive analog functions and digital functionality. Up to 32 consecutive con- versions, using two’s complement format, can be stored in an internal 32-word (16-bit wide) FIFO data buffer. An inter- nal 8-word RAM can store the conversion sequence for up to eight acquisitions through the LM12(H)458’s eight-input mul- tiplexer. The obsolete LM12454 has a four-channel multi- plexer, a differential multiplexer output, and a differential S/H input. The LM12(H)458 can also operate with 8-bit + sign resolution and in a supervisory “watchdog” mode that com- pares an input signal against two programmable limits. Programmable acquisition times and conversion rates are possible through the use of internal clock-driven timers. The reference voltage input can be externally generated for ab- solute or ratiometric operation or can be derived using the internal 2.5V bandgap reference. All registers, RAM, and FIFO are directly addressable through the high speed microprocessor interface to either an 8-bit or 16-bit data bus. The LM12(H)458 includes a direct memory access (DMA) interface for high-speed conversion data transfer. Additional applications information can be found in applica- tions notes AN-906, AN-947 and AN-949. Key Specifications (f CLK = 5 MHz; 8 MHz, H) j Resolution 12-bit + sign or 8-bit + sign j 13-bit conversion time 8.8 µs, 5.5 µs (H) (max) j 9-bit conversion time 4.2 µs, 2.6 µs (H) (max) j 13-bit Through-put rate 88k samples/s (min), 140k samples/s (H) (min) j Comparison time (“watchdog” mode) 2.2 µs (max), 1.4 µs (H) (max) j ILE ±1 LSB (max) j V IN range GND to V A + j Power Consumption 30 mW, 34 mW (H) (max) j Stand-by mode 50 µW (typ) j Single supply 3V to 5.5V Features n Three operating modes: 12-bit + sign, 8-bit + sign, and “watchdog” n Single-ended or differential inputs n Built-in Sample-and-Hold and 2.5V bandgap reference n Instruction RAM and event sequencer n 8-channel multiplexer n 32-word conversion FIFO n Programmable acquisition times and conversion rates n Self-calibration and diagnostic mode n 8- or 16-bit wide data bus microprocessor or DSP interface Applications n Data Logging n Instrumentation n Process Control n Energy Management n Inertial Guidance TRI-STATE® is a registered trademark of National Semiconductor Corporation. AT® is a registered trademark of International Business Machines Corporation. February 2006 © 2006 National Semiconductor Corporation DS011264 www.national.com |
Аналогичный номер детали - LM12458CIVX |
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Аналогичное описание - LM12458CIVX |
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