Analog Devices Inc. LTC5597 RMS Power Detector (0.1GHz to 70GHz)
Analog Devices Inc. LTC5597 RMS Power Detector (0.1GHz to 70GHz) is designed to measure an RF signal over a wide 100MHz to 70GHz frequency range. The LTC5597 measures RF power independent of input waveforms with different crest factors, such as CW, WCDMA, and OFDM (LTE and Wi-Fi®) signals. Up to 35dB dynamic range is achieved with a very stable output within the full case temperature range. This device is suitable for a wide range of RF and microwave applications, such as point-to-point microwave links, instrumentation, and power control applications.
The DC output voltage of the LTC5597 RMS Power Detector (0.1-70GHz) is an accurate representation of the average signal power applied to the RF input. The response is linear-in-dB with 28.5mV/dB logarithmic slope over a 35dB dynamic range with typically better than ±1dB accuracy. This device is particularly suited for measurement of waveforms with crest factor (CF) as high as 12dB and waveforms that exhibit a significant variation of the crest factor during measurement.
To achieve higher accuracy and lower output ripple, the averaging bandwidth can be externally adjusted by a capacitor connected between the FLTR and OUT pins. The enable interface switches the device between active measurement mode and a low power shutdown mode.
The Linear Technology / Analog Devices LTC5597 RMS Power Detector is available in a compact 8-pin Dual Flat No-Lead (DFN) package, ideal for space-constrained applications.
Features
- Ultra-wide matched 100MHz to 70GHz input frequency range
- 35dB linear dynamic range (<±1dB error)
- 28.5mV/dB logarithmic slope
- ±2dB flat response from 100MHz to 60GHz
- Accurate RMS power measurement of high crest factors up to 12dB independent of input waveforms
- Low power shutdown mode
- Low 33mA supply current at 3V (typical)
- Operating temperature range
- -40°C to +105°C (LTC5597I)
- -40°C to +125°C (LTC5597H)
- Guaranteed Log-Slope and Log-Intercept
- ESD ratings
- 2500V HBM
- 1500V CDM
- 2mm x 2mm plastic DFN8 package with exposed pad
Applications
- Point-to-point microwave links
- 5G, LTE, Wi-Fi, wireless networks
- SATCOM
- Instrumentation and measurement equipment
- Military radios
- RMS power measurement
- Receive and transmit gain control
- RF PA transmit power control
Development Tools
Analog Devices Inc. DC2932A Demonstration Circuit for LTC5597
Reference design for the LTC5597 100MHz to 70GHz RF RMS Power Detector.
Typical Application Circuit
Pin Designations & Package Outline
Output Voltage vs Frequency
Output Voltage vs RF Input Power
