space
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.
PART NUMBER | PACKAGE | BODY SIZE (MAX) |
---|---|---|
LMH2110 | DSBGA (6) | 1.27 mm × 0.87 mm |
Changes from C Revision (March 2013) to D Revision
Changes from B Revision (October 2013) to C Revision
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NUMBER | NAME | ||
A1 | VDD | Power Supply | Positive supply voltage. |
A2 | OUT | Output | Ground referenced detector output voltage. |
B1 | RFIN | Analog Input | RF input signal to the detector, internally terminated with 50 Ω. |
B2 | GND | Power Supply | Power Ground. May be left floating in case grounding is not feasible. |
C1 | GND | Power Supply | Power Ground. |
C2 | EN | Logic Input | The device is enabled for EN = High, and in shutdown mode for EN = Low. EN must be < 2.5 V to have low IEN. For EN > 2.5 V, IEN increases slightly, while device is still functional. Absolute maximum rating for EN = 3.6 V. |