The LMH2110 is a 45-dB Logarithmic RMS power detector particularly suited for accurate
power measurement of modulated RF signals that exhibit large peak-to-average ratios; that is, large
variations of the signal envelope. Such signals are encountered in W-CDMA and LTE cell phones. The
RMS measurement topology inherently ensures a modulation insensitive measurement.
The device has an RF frequency range from 50 MHz to 8 GHz. It provides an accurate,
temperature and supply insensitive output voltage that relates linearly to the RF input power in
dBm. The LMH2110 device has excellent conformance to a logarithmic response, enabling easy
integration by using slope and intercept only, reducing calibration effort significantly. The
device operates with a single supply from 2.7 V to
5 V. The LMH2110 has an RF power detection range from –40 dBm to 5 dBm and is ideally suited
for use in combination with a directional coupler. Alternatively, a resistive divider can be
The device is active for EN = High; otherwise, it is in a low power-consumption shutdown
mode. To save power and prevent discharge of an external filter capacitance, the output (OUT) is
high-impedance during shutdown.
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