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

4.3 Highlighted Products

The AFE74xx family has an integrated (DSA) on the receiver channels, and also supports DSA equivalent functionality on the transmitter channels. Each receiver channel has one analog RF peak power detector and various digital power detectors to assist in automatic gain control (AGC) for receiver channels, and two RF overload detectors for device reliability protection. The AFE74xx family has eight JESD204B-compatible SerDes transceivers running up to 15 Gbps. The devices have up to two DUCs per TX channel, and two digital downconverters (DDC) per RX channel, with multiple interpolation and decimation rates. These devices also have digital quadrature modulators and demodulators with independent, frequency flexible NCOs. The devices support up to 600-MHz RF signal bandwidth in single-band mode, and up to 300-MHz RF signal bandwidth per band in dual-band mode. A low-jitter phase-locked loop (PLL) voltage-controlled oscllator (VCO) simplifies the sampling clock generation by allowing use of a lower-frequency reference clock. The primary components discussed in this application report are the AFE7422 and AFE7444 (4T4R capable). As a 4T4R system, this repeater has the ability to operate on two separate bands using a 2T2R configuration for each repeating link.