SNWS022D January   2010  – June 2015 LMH2110

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 2.7-V and 4.5-V DC and AC Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Accurate Power Measurement
      2. 7.3.2 Types of RF Detectors
        1. 7.3.2.1 Peak Detectors
        2. 7.3.2.2 LOG Amp Detectors
        3. 7.3.2.3 RMS Detectors
      3. 7.3.3 LMH2110 RF Power Detector
        1. 7.3.3.1 RF Input
        2. 7.3.3.2 Enable
        3. 7.3.3.3 Output
        4. 7.3.3.4 Supply
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Application With Transmit Power Control
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Specifying Detector Performance
            1. 8.2.1.2.1.1 Dynamic Range
            2. 8.2.1.2.1.2 Log Conformance Error
            3. 8.2.1.2.1.3 Variation Over Temperature Error
            4. 8.2.1.2.1.4 1-dB Step Error
            5. 8.2.1.2.1.5 10-dB Step Error
            6. 8.2.1.2.1.6 Variation Due to Modulation
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Application With Resistive Divider
      3. 8.2.3 Application With Low-Pass Output Filter for Residual Ripple Reduction
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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订购信息

1 Features

  • 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

    • space

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.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (MAX)
LMH2110 DSBGA (6) 1.27 mm × 0.87 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Circuit

LMH2110 30064804.gif

Output Voltage and Log Conformance Error vs.
RF Input Power at 1900 MHz

LMH2110 30064838.gif