SNAU293 May   2024 LMX1860-SEP

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Setup
      1. 2.1.1  Evaluation Setup Requirement
      2. 2.1.2  Connection Diagram
      3. 2.1.3  How to Enable Full SPI Control
      4. 2.1.4  Power Requirements
      5. 2.1.5  Pin Mode Strapping
      6. 2.1.6  Reference Clock
      7. 2.1.7  Output Connections
      8. 2.1.8  Header Information
      9. 2.1.9  Default Configuration
      10. 2.1.10 How to Generate SYSREF
      11. 2.1.11 Multiplier Mode Example
      12. 2.1.12 Divider Mode Example
      13. 2.1.13 Hybrid Mode: SPI and Pin Mode
  8. 3Software
    1. 3.1 Software Installation
    2. 3.2 Software Description
    3. 3.3 USB2ANY Interface
  9. 4Implementation Results
    1. 4.1 Buffer, Divider, and Multiplier Modes
    2. 4.2 SYSREF Generation
    3. 4.3 SYSREF Delay Generators
  10. 5Hardware Design Files
    1. 5.1 Schematic
    2. 5.2 PCB Layout
    3. 5.3 PCB Layer Stack-Up
    4. 5.4 Bill of Materials
  11. 6Additional Information
    1. 6.1 Troubleshooting Guide
      1. 6.1.1 General Guidance
      2. 6.1.2 If Output Is Not Seen on CLKOUT
      3. 6.1.3 If Device Features Are Not Active
      4. 6.1.4 If Multiplier Frequency Is Not Accurate
      5. 6.1.5 If Divider Frequency Is Not Accurate
      6. 6.1.6 If SYSREF Is Not Observed
    2. 6.2 Trademarks

2.1.5 Pin Mode Strapping

Mode of Operation Jumper Position Multiplier/Divider Short Position Multiplier/Divider Value Short Position
Multiplier mode Short MUXSEL[1:0] to VCC (J35-J36)

Short DIVSEL[0] & DIVSEL[2] to GND & short DIVSEL[1] to VCC

x2 Multiplier value
Short DIVSEL[2] to GND x3 Multiplier value

Short DIVSEL[1:0] to GND & DIVSEL[2] to VCC

x4 Multiplier Value
Divider mode

Short MUXSEL[0] to GND

Short DIVSEL[2:1] to GND

Div by 2

Short DIVSEL[0] & DIVSEL[2] to GND

Div by 3

Short DIVSEL[2] to GND

Div by 4

Short DIVSEL[1:0] to GND

Div by 5

Short DIVSEL[1] to GND

Div by 6

Short DIVSEL[0] to GND

Div by 7

DIVSEL [2:0] float

Div by 8
Buffer mode

Short MUXSEL[1] to GND

N/A
Note:
  1. In multiplier mode, A LOW to HIGH transition on CAL header must be done. This is accomplished using a short on CAL header pin (J38) to VCC.
  2. Only divider values of 2/3/4 are available in pin mode. Divider values of 5 , 6 , 7 & 8 are valid divider values only when in SPI mode.