LM12H458CIVNOPB National Semiconductor, LM12H458CIVNOPB Datasheet

LM12H458CIVNOPB

Manufacturer Part Number

LM12H458CIVNOPB

Description

PLCC44

Manufacturer

National Semiconductor

Datasheet

1.LM12H458CIVNOPB.pdf (36 pages)

Specifications of LM12H458CIVNOPB

Date_code

08+

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LM12454/LM12458/LM12H458

12-Bit + Sign Data Acquisition System with

Self-Calibration

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 con-

versions, using two’s complement format, can be stored in

an internal 32-word (16-bit wide) FIFO data buffer. An inter-

nal 8-word RAM can store the conversion sequence for up to

eight acquisitions through the LM12(H)458’s eight-input mul-

tiplexer. The obsolete LM12454 has a four-channel multi-

plexer, 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 com-

pares an input signal against two programmable 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

internal 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 data bus. The LM12(H)458 includes a direct

memory access (DMA) interface for high-speed conversion

data transfer.

Additional applications information can be found in applica-

tions notes AN-906, AN-947 and AN-949.

TRI-STATE

is a registered trademark of International Business Machines Corporation.

is a registered trademark of National Semiconductor Corporation.

DS011264

Key Specifications

Features

n Three operating modes: 12-bit + sign, 8-bit + sign, and

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 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 data bus microprocessor or DSP

Applications

n Data Logging

n Instrumentation

n Process Control

n Energy Management

n Inertial Guidance

CLK

“watchdog”

interface

Resolution

13-bit conversion time

9-bit conversion time

13-bit Through-put rate

Comparison time

ILE

Power Consumption

Stand-by mode

Single supply

= 5 MHz; 8 MHz, H)

(“watchdog” mode)

range

12-bit + sign or 8-bit + sign

30 mW, 34 mW (H) (max)

140k samples/s (H) (min)

8.8 µs, 5.5 µs (H) (max)

4.2 µs, 2.6 µs (H) (max)

88k samples/s (min),

1.4 µs (H) (max)

February 2006

2.2 µs (max),

www.national.com

1 LSB (max)

GND to V

50 µW (typ)

3V to 5.5V

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