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MAX3861
2.7Gbps Post Amp with Automatic Gain Control


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 624kB)
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The MAX3861 is a low-power amplifier with automatic gain control (AGC), designed for WDM transmission systems employing optical amplifiers and requiring a vertical threshold adjustment after the post amp. Operating from a single 3.3V supply, this AGC amplifier linearly amplifies/attenuates the input signal while maintaining a fixed output-voltage swing at data rates up to 2.7Gbps. The input and output are on-chip terminated to match 50Ω interfaces.

This amplifier has a small-signal bandwidth of 3.4GHz and an input-referred noise of 0.26mVRMS. Over an input signal range of 6mVP-P to 1200mVP-P (46dB), the MAX3861 delivers a constant output amplitude adjustable from 400mVP-P to 920mVP-P. Variation in output swing is controlled within 0.2dB over a 16dB input range. The MAX3861 provides a received-signalstrength indicator (RSSI) that is linear, within 2.5%, for input signal levels up to 100mVP-P and an input signal detect (SD) with programmable threshold.

An evaluation kit is available:  MAX3861EVKIT  

Key Features   Applications/Uses
  • Single 3.3V Power Supply
  • 72mA Supply Current
  • 3.4GHz Small-Signal Bandwidth
  • 0.26mVRMS Input-Referred Noise
  • 6mVP-P to 1200mVP-P Input Range (46dB)
  • Input Signal Detect with Programmable Threshold
  • RSSI (Linear Up to 100mVP-P)
  • Adjustable Output Amplitude
  • 0.2dB Output Voltage Variation (Over 16dB Input Signal Variation)

     
  • Continuous Rate Receivers
  • Long-Reach Optical Receivers
  • OC-48/STM-16 Transmission Systems
  • WDM Optical Receivers

    Key Specifications:  Limiting Amplifiers
    Part Number Target Oper. Range
    (Gbps)
    Data Rate
    (Mbps)
    Data Rate
    (Mbps)
    VSUPPLY
    (V)
    ICC
    (mA)
    I/O Type Input Sens.
    (mV)
    LOS Sens.
    (mV)
    Edge Speed
    (ps)
    EV Kit Package/Pins Smallest Available Pckg.
    (mm2)
    Price
    min max typ min max max w/pins See Notes
    MAX3861  1 to 4.5 2125 2500 3.3 72 CML 15 4.5 130 Yes
    QFN/24
    TQFN/24
    16 $12.30 @1k
    See All Limiting Amplifiers (17)

    Diagram
    MAX3861: Typical Application Circuit
    Typical Application Circuit

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    Document Ref.: 19-2342; Rev 3; 2005-02-25
    This page last modified: 2008-03-12


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