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LM12H458 データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM12H458 データシート(HTML) 1 Page - National Semiconductor (TI) |
1 / 43 page LM12454/LM12458/LM12H458 12-Bit + Sign Data Acquisition System with Self-Calibration General Description The LM12454, LM12458, and LM12H458 are highly inte- grated Data Acquisition Systems. Operating on just 5V, they combine a fully-differential self-calibrating (correcting linear- ity 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 consecu- tive conversions, using two’s complement format, can be stored in an internal 32-word (16-bit wide) FIFO data buffer. An internal 8-word RAM can store the conversion sequence for up to eight acquisitions through the LM12(H)458’s eight-input multiplexer. The LM12454 has a four-channel multiplexer, a differential multiplexer output, and a differential S/H input. The LM12454 and LM12(H)458 can also operate with 8-bit + sign resolution and in a supervisory “watchdog” mode that compares an input signal against two program- mable 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 in- ternal 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 databus. The LM12454 and LM12(H)458 in- clude a direct memory access (DMA) interface for high-speed conversion data transfer. An evaluation/interface board is available. Order num- ber LM12458EVAL. 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 dissipation 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 (LM12(H)458), 4-channel (LM12454) 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 databus dmicroprocessor 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. July 1999 © 1999 National Semiconductor Corporation DS011264 www.national.com |
同様の部品番号 - LM12H458 |
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同様の説明 - LM12H458 |
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