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LTC1966IMS8#PBF

RMS-to-DC converter, ∆Σ, 0.1% accuracy, 155µA, MSOP-8

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Pieza del fabricante：

LTC1966IMS8#PBF

Paquete：

MSOP-8 (3.0×3.0×0.85 mm, 0.65mm pitch)

Marca：
Categorías de productos：
Compromiso de calidad
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Descripción

Productos

The LTC1966IMS8#PBF from Analog Devices (formerly Linear Technology) is a precision micropower true RMS-to-DC converter utilizing a patented delta-sigma (∆Σ) computational technique. With 0.1% gain accuracy, 0.02% linearity, and 155 µA supply current, it is far simpler to use, more accurate, and lower power than conventional log-antilog RMS-to-DC converters. Only one external capacitor is required for operation.

Especificaciones

Gain Accuracy 0.1% (50 Hz to 1 kHz)
Total Error 0.25% (50 Hz to 1 kHz)
Linearity 0.02%
Bandwidth 800 kHz (-3 dB), 6 kHz (±1%)
Supply Current 155 µA typical, 170 µA max
Shutdown Current 0.1 µA
Tensión de alimentación 2.7V to 5.5V single / ±5.5V dual
Input Range Up to 1VPEAK differential, rail-to-rail CM
Crest Factor Support Up to 4
Temperatura de funcionamiento -40°C to +85°C (I grade)
Paquete MSOP-8 (3×3 mm)

Características

  • ∆Σ computational technique: no diodes, heaters, or logarithms
  • Only one external averaging capacitor required
  • 0.1% gain accuracy with 0.02% linearity
  • Differential or single-ended input with rail-to-rail common mode
  • Constant bandwidth independent of input voltage
  • Rail-to-rail output with separate output reference pin
  • Ultra-low 0.1 µA shutdown current
  • Insensitive to PCB soldering stress and temperature drift

Aplicaciones

  • True RMS digital multimeters and panel meters
  • True RMS AC + DC measurements
  • Vibration and rumble monitoring systems
  • Audio level measurement and compression
  • Power line voltage and current monitoring

The LTC1966IMS8#PBF from Analog Devices is a precision micropower RMS-to-DC converter using patented ∆Σ technology. Achieving 0.1% gain accuracy and 0.02% linearity with only one external capacitor, it eliminates the complexity and drift of traditional log-antilog converters. The 155 µA supply current, differential input, and constant 800 kHz bandwidth make it ideal for true RMS multimeters, power monitoring, and vibration measurement in portable and industrial instruments.

The LTC1966 uses a patented delta-sigma (∆Σ) computational technique to perform true RMS-to-DC conversion. Unlike traditional log-antilog converters that compute Vrms = anti-log(avg(log²(Vin))), the LTC1966 uses a ∆Σ modulator to square the input signal, then averages the squared output through an external capacitor, and finally takes the square root via a ∆Σ demodulator circuit. This approach provides exceptional linearity (0.02%) and accuracy (0.1%) without the temperature sensitivity and matching requirements of log-antilog circuits. The external averaging capacitor (typically 1 µF) sets the low-frequency cutoff, while the bandwidth remains constant at 800 kHz regardless of input amplitude. The separate VOUTRTN pin allows the DC output to be referenced to any voltage within the supply rails.

Pin Nombre Tipo Función
1 VDD Potencia Positive supply (2.7-5.5V)
2 VIN2 Entrada Differential input negative terminal
3 VIN1 Entrada Differential input positive terminal
4 VSS Potencia Negative supply / ground (0V for single supply)
5 ENABLE Entrada Shutdown control (LOW = shutdown, HIGH = active)
6 CAVE E/S Averaging capacitor connection (1µF typical)
7 VOUTRTN Entrada Output reference pin (output DC level shift)
8 VOUT Salida RMS-converted DC output voltage
  • True RMS digital multimeters and handheld panel meters
  • True RMS AC+DC power line voltage and current monitoring
  • Vibration and rumble monitoring for industrial equipment
  • Audio level measurement, compression, and VU metering
  • Battery-powered portable instrumentation
Fabricante Número de pieza Paquete Notas
ADI LTC1967CMS8#PBF MSOP-8 Higher bandwidth (4MHz), 0.1% accuracy
ADI LTC1968CMS8#PBF MSOP-8 Even higher bandwidth (8MHz), faster response
ADI AD736JRZ DIP-8/SOIC-8 Traditional RMS-DC, lower cost, lower accuracy
Microchip MCP3901 SSOP-24 Energy metering IC with RMS computation
ADI LTC1966CMS8#PBF MSOP-8 Commercial temp (0-70°C), lower cost
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