Overview
The LTC1966HMS8#TRPBF is a high-precision, low-power RMS-to-DC converter (RMS-to-DC converter) from Analog Devices (ADI, formerly Linear Technology) . It employs an advanced Delta-Sigma architecture and is designed for true RMS measurement, precision instruments, industrial testing equipment, power analysis systems, and portable measurement devices . This device can directly convert AC or complex waveform signals into a DC voltage output proportional to the true RMS value, thus simplifying the design of traditional analog RMS calculation circuits.
The LTC1966HMS8#TRPBF features high precision, low power consumption, and wide input compatibility. It supports single-ended or differential input modes and employs a rail-to-rail output structure, making it compatible with various ADCs and data acquisition systems. The device requires only a few external components to achieve high-performance RMS measurement, making it particularly suitable for industrial and portable electronic devices with high requirements for measurement accuracy, stability, and power consumption.
Core parameters
| Parameter | Value |
| Product Type | RMS-to-DC converter |
| Transformation architecture | ΔΣ (Delta-Sigma) technology |
| Input method | Single-ended/differential input |
| Operating voltage | 2.7V ~ 5.5V (single power supply) |
| Dual power supply support | Maximum ±5.5V |
| Supply current | Typical 155μA |
| Turn-off current | Approximately 0.1 μA |
| Gain error | Approximately 0.1% in the 50Hz to 1kHz range. |
| linear error | Typical 0.02% |
| bandwidth | Approximately 800kHz (-3dB) |
| Output type | Rail-to-rail voltage output |
| Encapsulation type | MSOP-8 |
| Operating temperature range | -40°C to +125°C (Class H) |
| Packaging | Tape & Reel |
| Environmental standards | RoHS compliant |
The above parameters are based on Analog Devices’ official LTC1966 product datasheet.
Features
High-precision True RMS conversion
The LTC1966HMS8#TRPBF employs ΔΣ RMS conversion technology, which can accurately calculate the true effective value of AC signals, non-sinusoidal signals, and complex waveforms, offering higher measurement accuracy compared to traditional average value conversion schemes.
Ultra-low power design
The device has a typical supply current of only about 155μA and supports an ultra-low power shutdown mode, making it ideal for battery-powered instruments, portable test equipment, and long-term operation monitoring systems.
High linearity and stable performance
The LTC1966 offers excellent linearity, reduces system calibration requirements, and improves measurement consistency, making it suitable for precision voltage, current, and power measurement applications.
Flexible input configuration
It supports differential input and single-ended input modes, and can be adapted to different sensor outputs, current detection signals and AC measurement interfaces, improving the flexibility of system design.
Small MSOP package
It adopts an 8-pin MSOP package, which effectively reduces PCB footprint while maintaining high-performance RMS conversion capability, making it suitable for space-constrained electronic devices.
Typical application scenarios
Digital Multimeter (DMM)
Used for AC voltage and current True RMS measurements, improving instrument testing accuracy.
Industrial testing equipment
Industrial power supply testing, equipment status monitoring, and signal analysis instruments.
Power quality analysis system
Used for voltage and current waveform analysis and power parameter detection.
Data acquisition system
Connect the ADC and MCU to achieve high-precision digital acquisition of analog signals.
Portable measuring instruments
Battery-powered testing equipment, handheld testing instruments, and field maintenance tools.
Comparative Advantage Analysis
| Performance indicators | LTC1966HMS8#TRPBF | Traditional RMS conversion solutions |
| RMS measurement accuracy | high | generally |
| Power consumption | Extremely low | higher |
| Waveform adaptability | excellent | Limited |
| peripheral circuit complexity | Low | higher |
| Input method | Single-ended/Differential | Usually fixed |
| Package size | Small | Larger |
The LTC1966HMS8#TRPBF has significant advantages in measurement accuracy, power consumption control, and system integration , making it ideal for modern precision measurement system design.
Manufacturer Profile: Analog Devices
Analog Devices (ADI) is a leading global manufacturer of high-performance analog and mixed-signal semiconductors, with deep expertise in data conversion, signal chaining, power management, and industrial measurement. ADI’s precision analog products are widely used in industrial automation, medical devices, communication systems, automotive electronics, and test and measurement markets.
The LTC1966 series RMS-to-DC converters inherit Linear Technology’s technological advantages in the field of precision analog, providing a stable solution for high-reliability measurement applications.
Why choose LTC1966HMS8#TRPBF?
● High-precision True RMS conversion capability
● ΔΣ architecture enhances measurement stability
● Ultra-low power consumption, operating current of only about 155μA
● Supports single-ended and differential input configurations
● Rail-to-rail output for easy connection to ADC systems
● MSOP-8 small package, suitable for high-density designs
● ADI original quality, suitable for long-term industrial applications
Frequently Asked Questions (FAQ)
Q1: What is the difference between LTC1966HMS8#TRPBF and a regular AC voltage detection chip?
Conventional AC testing methods typically use average value calculation followed by proportional conversion, which is only suitable for signals close to a sine wave. The LTC1966HMS8#TRPBF, however, employs True RMS conversion technology, enabling accurate measurement of complex AC waveforms containing harmonics and distortion, thus improving the accuracy of test results.
Q2: Can LTC1966HMS8#TRPBF be used in a current sensing system?
Yes. This device can be used with current sensors, current transformers, or shunt detection circuits to convert AC current signals into corresponding RMS voltage outputs, which are then digitally processed by an ADC or MCU. It is suitable for power monitoring, power analysis, and industrial testing systems.
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