SNWS020C November   2007  – October 2015 LMH2100

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 Ratings
    4. 6.4 Thermal Information
    5. 6.5 2.7-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 Characteristics of the LMH2100
      2. 7.3.2 Accurate Power Measurement
        1. 7.3.2.1 LOG-Conformance Error
        2. 7.3.2.2 Temperature Drift Error
          1. 7.3.2.2.1 Temperature Compensation
          2. 7.3.2.2.2 Differential Power Errors
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown
        1. 7.4.1.1 Output Behavior in Shutdown
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Functionality and Application of RF Power Detectors
        1. 8.1.1.1 Functionality of RF Power Detectors
          1. 8.1.1.1.1 Key Characteristics of RF Power Detectors
          2. 8.1.1.1.2 Types of RF Power Detectors
            1. 8.1.1.1.2.1 Diode Detector
            2. 8.1.1.1.2.2 (Root) Mean Square Detector
            3. 8.1.1.1.2.3 Logarithmic Detectors
    2. 8.2 Typical Applications
      1. 8.2.1 Application With Transmit Power Control Loop
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Detector Interfacing
            1. 8.2.1.2.1.1 Concept of Power Measurements
            2. 8.2.1.2.1.2 RF Input
            3. 8.2.1.2.1.3 Output and Reference
              1. 8.2.1.2.1.3.1 Filtering
            4. 8.2.1.2.1.4 Interface to the ADC
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Application With Voltage Standing Wave Ratio Measurement
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Supply Lines
        1. 10.1.1.1 Positive Supply (VDD)
        2. 10.1.1.2 Ground (GND)
      2. 10.1.2 RF Input Interface
      3. 10.1.3 Microstrip Configuration
      4. 10.1.4 GCPW Configuration
      5. 10.1.5 Reference (REF)
      6. 10.1.6 Output (OUT)
    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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Supply Voltage: 2.7 V to 3.3 V
  • Output Voltage: 0.3 V to 2 V
  • 40-dB Linear in dB Power Detection Range
  • Shutdown
  • Multi-Band Operation from 50 MHz to 4 GHz
  • 0.5-dB Accurate Temperature Compensation
  • External Configurable Output Filter Bandwidth
  • 0.4-mm Pitch DSBGA Package

2 Applications

  • UMTS/CDMA/WCDMA RF Power Control
  • GSM/GPRS RF Power Control
  • PA Modules
  • IEEE 802.11b, g (WLAN)

3 Description

The LMH2100 is a 40-dB RF power detector intended for use in CDMA and WCDMA applications. The device has an RF frequency range from 50 MHz to
4 GHz. It provides an accurate temperature and supply compensated output voltage that relates linearly to the RF input power in dBm. The circuit operates with a single supply from 2.7 V to 3.3 V.

The LMH2100 has an RF power detection range from −45 dBm to −5 dBm, and is ideally suited for direct use in combination with a 30-dB directional coupler. Additional low-pass filtering of the output signal can be realized by means of an external resistor and capacitor. Typical Application: Output RC Low Pass Filter shows a detector with an additional output low pass filter. The filter frequency is set with RS and CS.

Typical Application: Feedback (R)C Low Pass Filter shows a detector with an additional feedback low pass filter. Resistor RP is optional and will lower the Trans impedance gain (RTRANS). The filter frequency is set with CP//CTRANS and RP//RTRANS.

The device is active for Enable = 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)
LMH2100 DSBGA (6) 1.274 mm × 0.874 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application: Output RC Low Pass Filter

LMH2100 30014071.gif

Typical Application: Feedback (R)C Low Pass Filter

LMH2100 30014004.gif