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LM12454 データシート(PDF) 1 Page - Texas Instruments |
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LM12454 データシート(HTML) 1 Page - Texas Instruments |
1 / 43 page LM12454, LM12458, LM12H458 www.ti.com SNAS079A – MAY 2004 – REVISED FEBRUARY 2006 LM12454/LM12458/LM12H458 12-Bit + Sign Data Acquisition System with Self-Calibration Check for Samples: LM12454, LM12458, LM12H458 1 FEATURES DESCRIPTION 23 • Three operating modes: 12-bit + sign, 8-bit + The LM12458, and LM12H458 are highly integrated sign, and “watchdog” Data Acquisition Systems. Operating on just 5V, they • Single-ended or differential inputs combine a fully-differential self-calibrating (correcting • Built-in Sample-and-Hold and 2.5V bandgap linearity and zero errors) 13-bit (12-bit + sign) analog- reference to-digital converter (ADC) and sample-and-hold (S/H) with extensive analog functions and digital • Instruction RAM and event sequencer functionality. Up to 32 consecutive conversions, using • 8-channel multiplexer two's complement format, can be stored in an internal • 32-word conversion FIFO 32-word (16-bit wide) FIFO data buffer. An internal 8- word RAM can store the conversion sequence for up • Programmable acquisition times and to eight acquisitions through the LM12(H)458's eight- conversion rates input multiplexer. The obsolete LM12454 has a four- • Self-calibration and diagnostic mode channel multiplexer, a differential multiplexer output, • 8- or 16-bit wide data bus microprocessor or and a differential S/H input. The LM12(H)458 can DSP interface also operate with 8-bit + sign resolution and in a supervisory “watchdog” mode that compares an input signal against two programmable limits. APPLICATIONS Programmable acquisition times and conversion rates • Data Logging are possible through the use of internal clock-driven • Instrumentation timers. The reference voltage input can be externally • Process Control generated for absolute or ratiometric operation or can be derived using the internal 2.5V bandgap • Energy Management reference. • Inertial Guidance All registers, RAM, and FIFO are directly addressable KEY SPECIFICATIONS through the high speed microprocessor interface to either an 8-bit or 16-bit data bus. The LM12(H)458 • Resolution: 12-bit + sign or 8-bit + sign includes a direct memory access (DMA) interface for • 13-bit conversion time: 8.8 μs, 5.5 μs (H) (max) high-speed conversion data transfer. • 9-bit conversion time: 4.2 μs, 2.6 μs (H) (max) Additional applications information can be found in • 13-bit Through-put rate: applications notes AN-906, AN-947 and AN-949. – 88k samples/s (min) – 140k samples/s (H) (min) • Comparison time: 2.2 μs (max) – ("watchdog” mode): 1.4 μs (H) (max) • ILE: ±1 LSB (max) • VIN range: GND to VA + • Power dissipation: 30 mW, 34 mW (H) (max) • Stand-by mode: 50 μW (typ) • Single supply: 3V to 5.5V 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 TRI-STATE is a registered trademark of Texas Instruments. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2004–2006, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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同様の説明 - LM12454 |
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