LTC1967IMS8#TRPBF【PDF 1/28 页】IC CONVERTER RMS-DC PREC 8MSOP

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LTC1967

1967f

Precision Extended

Bandwidth, RMS-to-DC Converter

High Linearity:

0.02% Linearity Allows Simple System Calibration

Wide Input Bandwidth:

Bandwidth to 0.1% Additional Gain Error: 40kHz

Bandwidth Independent of Input Voltage Amplitude

No-Hassle Simplicity:

True RMS-DC Conversion with Only One External

Capacitor

Delta Sigma Conversion Technology

Low Supply Current:

330礎 Typ

Ultralow Shutdown Current:

0.1礎

Flexible Inputs:

Differential or Single Ended

Rail-to-Rail Common Mode Voltage Range

Up to 1V

PEAK

Differential Voltage

Flexible Output:

Rail-to-Rail Output

Separate Output Reference Pin Allows Level Shifting

Small Size:

Space Saving 8-Pin MSOP Package

True RMS Digital Multimeters and Panel Meters

True RMS AC + DC Measurements

DESCRIPTIO

FEATURES

APPLICATIO S

The LTC

?/DIV>

1967 is a true RMS-to-DC converter that uses an

innovative delta-sigma computational technique. The ben-

efits of the LTC1967 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.

The LTC1967 operates with single-ended or differential in-

put signals (for EMI/RFI rejection) and supports crest fac-

tors up to 4. Common mode input range is rail-to-rail. Dif-

ferential input range is 1V

PEAK

, and offers unprecedented

linearity. The LTC1967 allows hassle-free system calibra-

tion at any input voltage.

The LTC1967 has a rail-to-rail output with a separate out-

put reference pin providing flexible level shifting; it oper-

ates on a single power supply from 4.5V to 5.5V. A low power

shutdown mode reduces supply current to 0.1礎.

The LTC1967 is packaged in the space-saving MSOP pack-

age, which is ideal for portable applications.

Single Supply RMS-to-DC Converter

AVE

1礔

OUT

1967 TA01

4.5V TO 5.5V

OUTPUT

DIFFERENTIAL

INPUT

LTC1967

0.1礔

OPT. AC

COUPLING

EN GND

OUT RTN

IN1

IN2

TYPICAL APPLICATIO

(mV AC

RMS

)

1.0

0.8

0.6

0.4

0.2

100 200 300 400

1967 TA01b

500

LTC1967, ?/DIV>

60Hz SINEWAVE

CONVENTIONAL

LOG/ANTILOG

Linearity Performance

, 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

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