LT5538IDD#TRPBF

LT5538IDD#TRPBF is a 40MHz to 3800MHz monolithic logarithmic RF power detector, capable of measuring RF signals over a wide dynamic range, from -75dBm to 10dBm. The RF signal in an equivalent decibel-scaled value is precisely converted into DC voltage on a linear scale. The wide linear dynamic range is achieved by measuring the RF signal using cascaded RF limiters and RF detectors. Their outputs are summed to generate an accurate linear DC voltage proportional to the input RF signal in dBm. The LT5538 delivers superior temperature stable output (within ±1dB over full temperature range) from 40MHz to 3.8GHz. The output is buffered with a low-impedance driver. Applications include received signal strength indication (RSSI), RF power measurement and control, RF/IF power detection, receiver RF/IF gain control, envelope detection, ASK receiver.

• Exceptional accuracy over temperature, single-ended RF input
• Supply voltage range from 3V to 5.25V
• Linear dynamic range is 75dB typical at (±1dB linearity error)
• Sensitivity is -72dBm typical at (TA = 25°C)
• Input resistance 394 ohm typical at (TA = 25°C)
• 2nd order harmonic distortion is -62dBc typical at (pin = -10dBm; at RF input)
• Logarithmic intercept is 87.5dBm typical at (TA = 25°C)
• Supply current is 29mA typical at (TA = 25°C)
• Shutdown current is 1μA typical at (ENBL = low, TA = 25°C)
• Operating temperature range from -40°C to 85°C, 8-lead plastic DFN package

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