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LM12458 Datasheet PDF - National ->Texas Instruments

Part NameDescriptionManufacturer
LM12458 12-Bit + Sign Data Acquisition System with Self-Calibration National-Semiconductor
National ->Texas Instruments National-Semiconductor
LM12458 Datasheet PDF : LM12458 pdf   
LM12H458CIVX image

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 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 obsolete LM12454 has a four-channel multiplexer, 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 compares an input signal against two programmable limits.

Features
■ Three operating modes: 12-bit + sign, 8-bit + sign, and “watchdog”
■ Single-ended or differential inputs
■ Built-in Sample-and-Hold and 2.5V bandgap reference
■ Instruction RAM and event sequencer
■ 8-channel multiplexer
■ 32-word conversion FIFO
■ Programmable acquisition times and conversion rates
■ Self-calibration and diagnostic mode
■ 8- or 16-bit wide data bus microprocessor or DSP interface

Applications
■ Data Logging
■ Instrumentation
■ Process Control
■ Energy Management
■ Inertial Guidance

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