Features Three operating modes: 12-bit + sign, 8-bit + sign, and "watchdog" Single-ended or differential inputs Built-in Sample-and-Hold 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 CMOS compatible I/O Description The LM12L458 is a highly integrated 3.3V Data Acquisition System. It combines 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 LM12L458's eight-input multiplexer. The LM12L458 can also operate with 8-bit + sign resolution and in a supervisory "watchdog" mode that compares an input signal against two programmable limits. Programmable acquisition times and conversion rates are possible through the use of internal clock-driven timers. 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 LM12L458 includes a direct memory access (DMA) interface for high-speed conversion data transfer. Additional applications information can be found in applications notes AN-906, AN-947 and AN-949. Key Specification (fCLK = 6 MHz) Resolution 12-bit + sign or 8-bit + sign Single supply +3V to +5.5V 13-bit conversion time 7.3 µs 9-bit conversion time 3.5 µs 13-bit Through-put rate 106k samples/s (min) Comparison time ("watchdog" mode) 1.8 µs (max) ILE ±1 LSB (max) Power Consumption 15 mW (max) Stand-by mode 5 µW (typ) Applications Data Logging Process Control Energy Management Medical Instrumentation

Also Recommended LM12458▲ 5V Version LM12H458▲ Higher Speed Version (5V)

	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM12L458 12-Bit Plus Sign Data Acquisition System with Self-Calibration	891 Kbytes	16-Feb-06	日本語

Application Notes

Title		Size	Date	Other Language
	AN-906: Application Note 906	561 Kbytes	5-Aug-95	日本語

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM12L458CIV/NOPB LM12L458CIV RoHS Status	PLCC	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 7 DIGI-KEY Worldwide 0 MOUSER Worldwide 20	$16.20 each at 1K+ pcs	rail of 25

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM12L458CIVF	NONE	NATIONAL SEMICONDUCTOR	05 Sep 2006

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM12L458.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM12L458 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM12L458CIV/NOPB LM12L458CIV	2214.83 2220	PLCC	44	3 2A	245 220	Detail	Download	N/A	NSUZXYYTTE# LM12L458CIV

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM12L458.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM12L458 is located at RoHS Status.

CAD Symbols and Models Download LM12L458 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM12L458CIV	CS150	1	16290	62	0	1157500	4	328443785

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM12L458.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM12L458 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM12L458CIVF	NONE	NATIONAL SEMICONDUCTOR	05 Sep 2006