1
LTC1968
1968f
Precision Wide Bandwidth,
RMS-to-DC Converter
?/DIV>
High Linearity:
0.02% Linearity Allows Simple System Calibration
?/DIV>
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
?/DIV>
No-Hassle Simplicity:
True RMS-DC Conversion with Only One External
Capacitor
Delta Sigma Conversion Technology
?/DIV>
Ultralow Shutdown Current:
0.1礎
?/DIV>
Flexible Inputs:
Differential or Single Ended
Rail-to-Rail Common Mode Voltage Range
Up to 1V
PEAK
Differential Voltage
?/DIV>
Flexible Output:
Rail-to-Rail Output
Separate Output Reference Pin Allows Level Shifting
?/DIV>
Small Size:
Space Saving 8-Pin MSOP Package
?/DIV>
True RMS Digital Multimeters and Panel Meters
?/DIV>
True RMS AC + DC Measurements
DESCRIPTIO
FEATURES
APPLICATIO S
The LTC
?/DIV>
1968 is a true RMS-to-DC converter that uses an
innovative delta-sigma computational technique. The ben-
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.
The LTC1968 operates with single-ended or differential in-
put signals and accurately supports crest factors up to 4.
Common mode input range is rail-to-rail. Differential in-
put range is 1V
PEAK
, and offers unprecedented linearity. The
LTC1968 allows hassle-free system calibration at any in-
put voltage.
The LTC1968 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 LTC1968 is packaged in the space-saving MSOP pack-
age, which is ideal for portable applications.
Single Supply RMS-to-DC Converter
C
AVE
10礔
V
OUT
+
1968 TA01
4.5V TO 5.5V
OUTPUT
DIFFERENTIAL
INPUT
LTC1968
V
+
0.1礔
OPT. AC
COUPLING
EN GND
OUT RTN
IN1
IN2
TYPICAL APPLICATIO
V
IN
(mV AC
RMS
)
0
1.0
0.8
0.6
0.4
0.2
0
0.2
100 200 300 400
1968 TA01b
500
LTC1968, ?/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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