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 FEATURES 1 23 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 DESCRIPTION APPLICATIONS 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) analogto-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 8word RAM can store the conversion sequence for up
to eight acquisitions through the LM12(H)458's eightinput multiplexer. The obsolete LM12454 has a fourchannel multiplexer, a differential multiplexer output, …
