Datasheet > LM12458

LM12458

更新时间： 2024-11-27 11:12:23

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德州仪器 - TI		/
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47页	1867K
描述
具有自校准功能的 88kSPS、12 位 + 符号数据采集系统

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LM12458 数据手册

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

DESCRIPTION

•

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

sign, and “watchdog”

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.

•

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

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 absolute or ratiometric operation or can

be derived using the internal 2.5V bandgap

reference.

•

Data Logging

Instrumentation

Process Control

Energy Management

Inertial Guidance

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.

KEY SPECIFICATIONS

•

Resolution: 12-bit + sign or 8-bit + sign

13-bit conversion time: 8.8 μs, 5.5 μs (H) (max)

9-bit conversion time: 4.2 μs, 2.6 μs (H) (max)

13-bit Through-put rate:

Additional applications information can be found in

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

–

88k samples/s (min)

140k samples/s (H) (min)

•

Comparison time: 2.2 μs (max)

("watchdog” mode): 1.4 μs (H) (max)

–

•

ILE: ±1 LSB (max)

V_INrange: GND to VA ⁺

Power dissipation: 30 mW, 34 mW (H) (max)

Stand-by mode: 50 μW (typ)

Single supply: 3V to 5.5V

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

TRI-STATE is a registered trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...47

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与LM12458相关器件

型号	品牌	获取价格	描述	数据表
LM12458CIV	NSC	获取价格	12-Bit Sign Data Acquisition System with Self-Calibration
LM12458CIV/NOPB	NSC	获取价格	IC SPECIALTY ANALOG CIRCUIT, PQCC44, PLASTIC, LCC-44, Analog IC:Other
LM12458CIV/NOPB	TI	获取价格	具有自校准功能的 88kSPS、12 位 + 符号数据采集系统 \| FN \| 44 \| -
LM12458CIVF	NSC	获取价格	12-Bit Sign Data Acquisition System with Self-Calibration
LM12458CIVX	NSC	获取价格	12-Bit + Sign Data Acquisition System with Self-Calibration
LM12458CIVX/NOPB	TI	获取价格	具有自校准功能的 88kSPS、12 位 + 符号数据采集系统 \| FN \| 44 \| -
LM12458CMEL/883	ETC	获取价格	Single-Ended Data Acquisition System
LM12458MEL/883	ETC	获取价格	Single-Ended Data Acquisition System
LM12458MW/883	ETC	获取价格	Single-Ended Data Acquisition System
LM1246	NSC	获取价格	150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character

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