LTC1966MPMS8 Analog Devices Integrated Circuit (Small Outline Packages) In Stock
Analog Devices LTC1966MPMS8 is a delta-sigma RMS-to-DC converter with 1.05 V maximum input, 170 µA supply current, and 800 kHz bandwidth in an 8-pin MSOP package. It delivers accurate true-RMS measurement of AC signals without precision resistors or trims. Ideal for power meters, multimeters, AC sensor interfaces, and telecommunications equipment requiring high-accuracy RMS conversion of broadband signals.
- Manufacturer
- Analog Devices
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- LTC1966MPMS8 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LTC1966MPMS8?
- Delta-sigma modulation architecture delivering accurate true-RMS conversion up to 800 kHz without external precision resistors
- Ultra-low 170 µA supply current enabling battery-powered and handheld meter applications
- 1.05 V maximum differential input range for direct interface with AC signal sources and current-sense amplifiers
- Compact 8-pin MSOP package minimizing board footprint in space-constrained power monitoring and metering designs
- Military temperature grade (MP suffix) ensuring operation from -55°C to 125°C in harsh industrial and defense environments
What is LTC1966MPMS8 used for?
The LTC1966MPMS8 is designed for true-RMS power measurement in precision digital multimeters, energy meters, and industrial current and voltage monitoring systems that must accurately measure waveforms with high crest factors up to 800 kHz. Its low 170 µA supply current makes it a natural fit for battery-powered handheld test instruments and IoT-connected power meters where long battery life is critical. The device is also used in telecommunications line-monitoring equipment and audio-level meters where accurate dBm measurements across complex waveforms require delta-sigma RMS conversion rather than average-rectified sensing.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the LTC1966MPMS8 datasheet?
LTC1966MPMS8 Datasheet DownloadOfficial datasheet from Analog Devices
What are equivalent replacements for LTC1966MPMS8?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Up to what signal frequency can the LTC1966MPMS8 accurately compute true RMS, and what crest factors are supported?
The LTC1966MPMS8 maintains accurate true-RMS conversion for input signals up to 800 kHz, with an error below 0.1% for crest factors up to 4 when the output averaging capacitor is appropriately sized. At lower frequencies such as 50 Hz to 60 Hz mains, the same device achieves sub-0.1% conversion accuracy with a 1 µF external averaging capacitor, making it suitable for both power-line energy meters and high-frequency AC signal analyzers within a single 8-pin MSOP design.
How does LTC1966MPMS8 achieve accurate RMS measurement without requiring precision resistors or factory calibration?
The LTC1966MPMS8 uses a delta-sigma modulation architecture that implicitly computes the square, mean, and square-root operations in the digital domain, eliminating the temperature-sensitive log-antilog analog multiplier circuits that require laser-trimmed resistors in older RMS converters. This approach keeps gain error below 0.3% over the full operating range without any user calibration, which simplifies production testing in multimeter and energy meter manufacturing lines and eliminates the need for individual unit trim procedures.
What supply current does the LTC1966MPMS8 draw, and how does this affect battery life in a handheld multimeter?
The LTC1966MPMS8 draws only 170 µA from its supply, which is roughly 10 times lower than competing log-antilog RMS-DC converters that typically consume 1 mA to 2 mA. In a handheld multimeter powered by a 9 V alkaline battery with 565 mAh capacity, a 170 µA RMS converter draws the equivalent of less than 0.1% of the total instrument current budget, allowing the battery to last months under typical usage without the RMS block contributing measurable drain on overall battery life.
For a military or defense instrument design, what temperature range does the LTC1966MPMS8 support and how does the MP grade differ from commercial versions?
The LTC1966MPMS8 carries the MP temperature grade, which guarantees full specified operation from -55°C to 125°C, covering the full military temperature range. The commercial C-grade LTC1966 is specified only from 0°C to 70°C, making it unsuitable for avionics test equipment or field instruments that must function in Arctic ground temperatures or in hot engine-bay enclosures. The MP-grade device uses screened silicon with tighter wafer parametric limits to ensure the 0.3% conversion accuracy specification holds across the full -55°C to 125°C junction temperature range.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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