1 Features

1• Wide Supply Range from 2.7 V to 5 V

• Logarithmic Root Mean Square Response

• 45-dB Linear-in-dB Power Detection Range

• Multi-Band Operation from 50 MHz to 8 GHz

• LOG Conformance Better than ±0.5 dB

• Highly Temperature Insensitive, ±0.25 dB

• Modulation Independent Response, 0.08 dB

• Minimal Slope and Intercept Variation

• Shutdown Functionality

• Tiny 6-Bump DSBGA Package

2 Applications

• Multi-Mode, Multi-Band RF Power Control

– GSM/EDGE

– CDMA/CDMA2000

– W-CDMA

– OFDMA

– LTE

• Infrastructure RF Power Control

3 Description

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 used.

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.