LTC1968 - Precision Wide Bandwidth, RMS-to-DC Converter
Features
- 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 - 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 1VPEAK Differential Voltage - Flexible Output:
Rail-to-Rail Output
Separate Output Reference Pin Allows Level Shifting - Small Size:
Space Saving 8-Pin MSOP Package
Typical Application
Description
The LTC1968 is a true RMS-to-DC converter that uses an innovative delta-sigma computational technique. The benefits of the LTC1968 proprietary architecture, when compared 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 input signals and accurately supports crest factors up to 4. Common mode input range is rail-to-rail. Differential input range is 1VPEAK, and offers unprecedented linearity. The LTC1968 allows hassle-free system calibration at any input voltage.
The LTC1968 has a rail-to-rail output with a separate output reference pin providing flexible level shifting; it operates on a single power supply from 4.5V to 5.5V. A low power shutdown mode reduces supply current to 0.1µA.
The LTC1968 is packaged in the space-saving MSOP package, which is ideal for portable applications.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
MSOP-8
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC1968CMS8 | MSOP | 8 | C | $5.21 | $3.95 | View |
| LTC1968CMS8#PBF | MSOP | 8 | C | $5.21 | $3.95 | View |
| LTC1968CMS8#TR | MSOP | 8 | C | $4.01 | View | |
| LTC1968CMS8#TRPBF | MSOP | 8 | C | $4.01 | View | |
| LTC1968IMS8 | MSOP | 8 | I | $8.80 | $6.60 | View |
| LTC1968IMS8#PBF | MSOP | 8 | I | $8.80 | $6.60 | View |
| LTC1968IMS8#TR | MSOP | 8 | I | $6.66 | View | |
| LTC1968IMS8#TRPBF | MSOP | 8 | I | $6.66 | View | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology demo boards are offered free of charge to qualified customers. Contact your local sales office or distributor to request a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC427B-C | LTC1968CMS8 | RMS to DC Converter | $50.00 | |
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Applications
- True RMS Digital Multimeters and Panel Meters
- True RMS AC + DC Measurements
Simulate
LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.