SLAA871 January   2019 AFE7422 , AFE7444

 

  1.   AFE74xx as a single-chip wideband repeater using loopback mode
    1.     Trademarks
    2. 1 Introduction
    3. 2 Repeater Mode (RX-TX Loopback With SerDes Bypassed)
      1. 2.1 Overview of the AFE74xx Repeater Mode
      2. 2.2 Configuration of the AFE74xx as a Repeater
      3. 2.3 Programming the Repeater Mode
        1. 2.3.1 Hardware Setup
        2. 2.3.2 Software Setup and GUI Configuration
    4. 3 130-MHz Digital Repeater System Overview
      1. 3.1 Key System Specifications
    5. 4 System Overview
      1. 4.1 Block Diagram
      2. 4.2 Design Considerations
      3. 4.3 Highlighted Products
        1. 4.3.1 LMK04828
      4. 4.4 System Design Theory
    6. 5 Hardware and Testing
      1. 5.1 Measured Latency and Gain
        1. 5.1.1 Hardware
        2. 5.1.2 Test Setup and Results
      2. 5.2 Measured Linearity Performance
        1. 5.2.1 Hardware and Test Setup
        2. 5.2.2 Test Results
      3. 5.3 Measured Selectivity (Out-of-Band Jammer)
        1. 5.3.1 Hardware and Test Setup
        2. 5.3.2 Test Results
    7. 6 Terminology

1 Introduction

5G networks demand RF repeaters that can support very large signal bandwidth. The AFE7422 and AFE7444 (AFE74xx) include dual- and quad-channel, 14-bit, RF-sampling analog front ends (AFEs) that integrate four digital-to-analog converters (DAC) and four analog-to-digital converters (ADC) capable of sampling up to 9 GHz and 3 GHz, respectively.

Features include:

  • No requirement of FPGA or ASIC
  • No requirement of JESD link establishment
  • No need for physical SerDes receiver and SerDes transmitter lanes
  • Single-chip operation
  • Wide-RF instantaneous bandwidth supporting 130 MHz to 1.2 GHz
  • RX to TX loopback latency = 1.2 µs