Datasheet > LM12454

LM12454

更新时间： 2024-11-22 22:51:59

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
43页	993K
描述
12-Bit Sign Data Acquisition System with Self-Calibration

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LM12454 数据手册

July 1999

LM12454/LM12458/LM12H458

12-Bit + Sign Data Acquisition System with

Self-Calibration

General Description

Key Specifications

(f_CLK5 MHz; 8 MHz, H)

The LM12454, LM12458, and LM12H458 are highly inte-

grated Data Acquisition Systems. Operating on just 5V, they

combine a fully-differential self-calibrating (correcting linear-

ity 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 consecu-

tive 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 LM12454 has a four-channel

multiplexer, a differential multiplexer output, and a differential

S/H input. The LM12454 and LM12(H)458 can also operate

with 8-bit + sign resolution and in a supervisory “watchdog”

mode that compares an input signal against two program-

mable limits.

Resolution

12-bit + sign or 8-bit + sign

8.8 µs, 5.5 µs (H) (max)

4.2 µs, 2.6 µs (H) (max)

13-bit conversion time

9-bit conversion time

13-bit Through-put rate

88k samples/s (min),

140k samples/s (H) (min)

Comparison time

2.2 µs (max),

1.4 µs (H) (max)

(“watchdog” mode)

1 LSB (max)

ILE

V_INrange

GND to V_A

Power dissipation

Stand-by mode

Single supply

30 mW, 34 mW (H) (max)

50 µW (typ)

3V to 5.5V

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 in-

ternal 2.5V bandgap reference.

Features

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

“watchdog”

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 (LM12(H)458), 4-channel (LM12454)

multiplexer

All registers, RAM, and FIFO are directly addressable

through the high speed microprocessor interface to either an

8-bit or 16-bit databus. The LM12454 and LM12(H)458 in-

clude

a direct memory access (DMA) interface for

high-speed conversion data transfer.

n 32-word conversion FIFO

An evaluation/interface board is available. Order num-

ber LM12458EVAL.

n Programmable acquisition times and conversion rates

n Self-calibration and diagnostic mode

n 8- or 16-bit wide databus dmicroprocessor or DSP

interface

Additional applications information can be found in applica-

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

Applications

n Data Logging

n Instrumentation

n Process Control

n Energy Management

n Inertial Guidance

TRI-STATE^®is a registered trademark of National Semiconductor Corporation.

AT^®is a registered trademark of International Business Machines Corporation.

DS011264

www.national.com

12 3 4 5 6 7...43

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与LM12454相关器件

型号	品牌	获取价格	描述	数据表
LM12454_06	NSC	获取价格	12-Bit + Sign Data Acquisition System with Self-Calibration
LM12454CIV	NSC	获取价格	12-Bit Sign Data Acquisition System with Self-Calibration
LM12457AB	LIGHTKEY	获取价格	LM7057A/B Series - 0.70 inch 5x7 Dot Matrix LED Display
LM12457AD	LIGHTKEY	获取价格	LM7057A/B Series - 0.70 inch 5x7 Dot Matrix LED Display
LM12457AG	LIGHTKEY	获取价格	LM7057A/B Series - 0.70 inch 5x7 Dot Matrix LED Display
LM12457AO	LIGHTKEY	获取价格	LM7057A/B Series - 0.70 inch 5x7 Dot Matrix LED Display
LM12457APG	LIGHTKEY	获取价格	LM7057A/B Series - 0.70 inch 5x7 Dot Matrix LED Display
LM12457AR	LIGHTKEY	获取价格	LM7057A/B Series - 0.70 inch 5x7 Dot Matrix LED Display
LM12457AUA	LIGHTKEY	获取价格	LM7057A/B Series - 0.70 inch 5x7 Dot Matrix LED Display
LM12457AUB	LIGHTKEY	获取价格	LM7057A/B Series - 0.70 inch 5x7 Dot Matrix LED Display

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