LINEAR LTC1968 User's Manual and Technical Data Sheet
Summary
The LTC1968 is a high-precision, wide bandwidth True RMS-to-DC converter designed for accurate measurement applications. It utilizes advanced Delta Sigma technology to ensure exceptional linearity and minimizes calibration complexity. The manual provides detailed electrical specifications, operational characteristics, and application examples for building demanding instruments such as digital multimeters and panel meters by delivering reliable, true RMS measurements across a wide range of inputs. (Approx. 400 characters)
Page 1 Text Content
LTC1968
Precision Wide Bandwidth, RMS-to-DC Converter
FEATURES DESCRIPTIO High Linearity: The LTC®1968 is a true RMS-to-DC converter that uses an 0.02% Linearity Allows Simple System Calibration innovative delta-sigma computational technique. The ben- Wide Input Bandwidth: efits of the LTC1968 proprietary architecture, when com- Bandwidth to 1% Additional Gain Error: 500k Hz pared to conventional log-antilog RMS-to-DC converters,
Bandwidth to 0.1% Additional Gain Error: 150k Hz are higher linearity and accuracy, bandwidth independent
3d B Bandwidth Independent of Input Voltage of amplitude and improved temperature behavior. Amplitude
The LTC1968 operates with single-ended or differential in-
No-Hassle Simplicity:
put signals and accurately supports crest factors up to 4.
True RMS-DC Conversion with Only One External
Common mode input range is rail-to-rail. Differential in-
Capacitor
put range is 1VPEAK, and offers unprecedented linearity. The
Delta Sigma Conversion Technology
LTC1968 allows hassle-free system calibration at any in-
Ultralow Shutdown Current:
put voltage.
Flexible Inputs: The LTC1968 has a rail-to-rail output with a separate out-
NE AR IT ER RO (V OU DC IN AC RM S)
Differential or Single Ended put reference pin providing flexible level shifting; it oper- Rail-to-Rail Common Mode Voltage Range ates on a single power supply from 4.5V to 5.5V. A low power Up to 1VPEAK Differential Voltage shutdown mode reduces supply current to 0.1µA.
Flexible Output:
The LTC1968 is packaged in the space-saving MSOP pack-
Rail-to-Rail Output
age, which is ideal for portable applications.
Separate Output Reference Pin Allows Level Shifting
, LTC and LT are registered trademarks of Linear Technology Corporation. Small Size: 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
Single Supply RMS-to-DC Converter
LTC1968, ∆Σ
4.5V TO 5.5V
V+ IN1 OUTPUT
DIFFERENTIAL CAVE
LTC1968 VOUT
INPUT 10µF
IN2 OUT RTN
CONVENTIONAL
EN GND
0.1µF LOG/ANTILOG OPT. AC
COUPLING
1968 TA01
60Hz SINEWAVE –1.0LI
VIN (m V ACRMS) 1968 TA01b
Page Summary Contents For LINEAR LTC1968 User's Manual and Technical Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 291.48 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What power supply range does the LTC1968 operate on?
It operates using a single power supply from 4.5V to 5.5V.
How low is the current consumption when the device is shut down?
The shutdown mode reduces the supply current to an ultralow level of 0.1µA.
Is this converter suitable for portable or space-constrained environments?
Yes, it features a rail-to-rail output and is packaged in a space-saving MSOP package.
Does the device allow for external voltage adjustment on the output?
It includes a separate output reference pin that provides flexible level shifting capabilities.