Datasheet > LTC1968

LTC1968

更新时间： 2023-12-20 18:44:06

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
28页	296K
描述
精准型、宽带宽、 RMS 至 DC 转换器

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LTC1968 数据手册

LTC1968

Precision Wide Bandwidth,

RMS-to-DC Converter

FEATURES

DESCRIPTIO

The LTC^®1968 is a true RMS-to-DC converter that uses an

innovativedelta-sigmacomputationaltechnique.Theben-

efits of the LTC1968 proprietary architecture, when com-

pared to conventional log-antilog RMS-to-DC converters,

are higher linearity and accuracy, bandwidth independent

of amplitude and improved temperature behavior.

■

High Linearity:

0.02% Linearity Allows Simple System Calibration

■

Wide Input Bandwidth:

Bandwidth to 1% Additional Gain Error: 500kHz

Bandwidth to 0.1% Additional Gain Error: 150kHz

3dB Bandwidth Independent of Input Voltage

Amplitude

TheLTC1968operateswithsingle-endedordifferentialin-

put signals and accurately supports crest factors up to 4.

Common mode input range is rail-to-rail. Differential in-

putrangeis1V_PEAK,andoffersunprecedentedlinearity.The

LTC1968 allows hassle-free system calibration at any in-

put voltage.

■

No-Hassle Simplicity:

True RMS-DC Conversion with Only One External

Capacitor

Delta Sigma Conversion Technology

Ultralow Shutdown Current:

0.1µA

Flexible Inputs:

Differential or Single Ended

Rail-to-Rail Common Mode Voltage Range

Up to 1V_PEAKDifferential Voltage

Flexible Output:

Rail-to-Rail Output

Separate Output Reference Pin Allows Level Shifting

Small Size:

■

The LTC1968 has a rail-to-rail output with a separate out-

put reference pin providing flexible level shifting; it oper-

atesonasinglepowersupplyfrom4.5Vto5.5V.Alowpower

shutdown mode reduces supply current to 0.1µA.

■

TheLTC1968ispackagedinthespace-savingMSOPpack-

age, which is ideal for portable applications.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Protected under U.S. Patent Numbers 6,359,576, 6,362,677 and 6,516,291

Space Saving 8-Pin MSOP Package

APPLICATIO S

■

True RMS Digital Multimeters and Panel Meters

True RMS AC + DC Measurements

■

TYPICAL APPLICATIO

Linearity Performance

0.2

Single Supply RMS-to-DC Converter

LTC1968, ∆Σ

4.5V TO 5.5V

–0.2

–0.4

IN1

IN2

OUTPUT

LTC1968

AVE

10µF

DIFFERENTIAL

INPUT

–

OUT

OUT RTN

GND

–0.6

–0.8

–1.0

CONVENTIONAL

LOG/ANTILOG

0.1µF

OPT. AC

COUPLING

1968 TA01

60Hz SINEWAVE

100 200

300

400

500

1968 TA01b

(mV AC

)

RMS

1968f

12 3 4 5 6 7...28

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