LTC1966 - Precision Micropower ΔΣ RMS-to-DC Converter
Features
- Simple to Use, Requires One Capacitor
- True RMS DC Conversion Using ∆Σ Technology
- High Accuracy:
0.1% Gain Accuracy from 50Hz to 1kHz
0.25% Total Error from 50Hz to 1kHz - High Linearity:
0.02% Linearity Allows Simple System Calibration - Low Supply Current:
155μA Typ, 170μA Max - Ultralow Shutdown Current:
0.1μA - Constant Bandwidth:
Independent of Input Voltage
800kHz –3dB, 6kHz ±1% - Flexible Supplies:
2.7V to 5.5V Single Supply
Up to ±5.5V Dual Supply - 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 - Wide Temperature Range:
–55°C to 125°C - Small Size:
Space Saving 8-Pin MSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®1966 is a true RMS-to-DC converter that utilizes an innovative patented ∆Σ computational technique. The internal delta sigma circuitry of the LTC1966 makes it simpler to use, more accurate, lower power and dramatically more flexible than conventional log antilog RMS-to-DC converters.
The LTC1966 accepts single-ended or differential input signals (for EMI/RFI rejection) and supports crest factors up to 4. Common mode input range is rail-to-rail. Differential input range is 1VPEAK, and offers unprecedented linearity. Unlike previously available RMS-to-DC converters, the superior linearity of the LTC1966 allows hassle free system calibration at any input voltage.
The LTC1966 also has a rail-to-rail output with a separate output reference pin providing flexible level shifting. The LTC1966 operates on a single power supply from 2.7V to 5.5V or dual supplies up to ±5.5V. A low power shutdown mode reduces supply current to 0.5μA.
The LTC1966 is insensitive to PC board soldering and stresses, as well as operating temperature. The LTC1966 is packaged in the space saving MSOP package which is ideal for portable applications.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC1966CMS8#PBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LTC1966CMS8#TRPBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LTC1966HMS8#PBF | MS-8 | MS8 | H | 05-08-1660 | Yes |
| LTC1966HMS8#TRPBF | MS-8 | MS8 | H | 05-08-1660 | Yes |
| LTC1966IMS8#PBF | MS-8 | MS8 | I | 05-08-1660 | Yes |
| LTC1966IMS8#TRPBF | MS-8 | MS8 | I | 05-08-1660 | Yes |
| LTC1966MPMS8#PBF | MS-8 | MS8 | MP | 05-08-1660 | Yes |
| LTC1966MPMS8#TRPBF | MS-8 | MS8 | MP | 05-08-1660 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- 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 | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1966CMS8#PBF | MS-8 | C | $3.90 | $2.95 | Yes | |
| LTC1966CMS8#TRPBF | MS-8 | C | $3.01 | Yes | ||
| LTC1966HMS8#PBF | MS-8 | H | $9.68 | $6.95 | Yes | |
| LTC1966HMS8#TRPBF | MS-8 | H | $9.74 | $7.01 | Yes | |
| LTC1966IMS8#PBF | MS-8 | I | $6.60 | $4.95 | Yes | |
| LTC1966IMS8#TRPBF | MS-8 | I | $5.01 | Yes | ||
| LTC1966MPMS8#PBF | MS-8 | MP | $12.48 | $8.95 | Yes | |
| LTC1966MPMS8#TRPBF | MS-8 | MP | $12.54 | $9.01 | Yes | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about 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-A | LTC1966CMS8 | RMS to DC Converter | $50.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1966HMS8#PBF | MS-8 | H | $9.68 | $6.95 | Yes | |
| LTC1966HMS8#TRPBF | MS-8 | H | $9.74 | $7.01 | Yes | |
| LTC1966IMS8#PBF | MS-8 | I | $6.60 | $4.95 | Yes | |
| LTC1966IMS8#TRPBF | MS-8 | I | $5.01 | Yes | ||
| LTC1966MPMS8#PBF | MS-8 | MP | $12.48 | $8.95 | Yes | |
| LTC1966MPMS8#TRPBF | MS-8 | MP | $12.54 | $9.01 | Yes | |
| Buy Now • Request Samples | ||||||
Applications
- True RMS Digital Multimeters and Panel Meters
- True RMS AC + DC Measurements
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Design Tools
LTspice
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LTC1966
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-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.
