Texas Instruments ONET1131EC User Manual

User's Guide

SLLU256–October 2016

ONET1131EC Evaluation Module

This document describes the main features and functionality of the evaluation module (EVM) board for the devices.

The ONET1131EC is a 11.7-Gbps transceiver with an integrated limiting amplifier and a modulator driver. The EVM can be used to evaluate the performance of the parts in conjunction with an electroabsorptive

modulated laser (EML) transmit optical subassembly (TOSA) and a receive optical subassembly (ROSA) in standard XMD-compliant packages.

The EVM is controlled with a graphical user interface (GUI). Throughout this document, the images shown may represent the ONET1130Ex. Those images are

representative of the boards and parts on the ONET1131EC.

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Contents

1 Hardware and Equipment................................................................................................... 2

2 EVM Block Diagram ......................................................................................................... 2

3 EVM Connections............................................................................................................ 3

4 Measurement Setup......................................................................................................... 6

4.1 Open Loop Operation Without Fault Detection or Digital Monitoring ........................................ 8

4.2 Closed Loop Operation with Fault Detection and Digital Monitoring ....................................... 10

5 LED Indicators .............................................................................................................. 13

6 Typical Performance Results ............................................................................................. 13

7 Schematics and Bill of Materials ......................................................................................... 15

7.1 Schematics......................................................................................................... 15

7.2 Bill of Materials .................................................................................................... 18

1 ONET1131EC EVM Block Diagram....................................................................................... 2

2 ONET1131EC EVM Connections ......................................................................................... 3

3 TOSA and EML Connections for TEC Controller ....................................................................... 4

4 Main EVM Connections..................................................................................................... 5

5 Typical Setup................................................................................................................. 6

6 Low Level Register Interface Page........................................................................................ 7

7 Core Configuration Page ................................................................................................... 8

8 Transmitter Configuration Page ........................................................................................... 9

9 Core Configuration Page.................................................................................................. 10

10 Transmitter Configuration Page .......................................................................................... 11

11 Read Only Status Page ................................................................................................... 12

12 Unfiltered Transmitter Eye Diagram ..................................................................................... 13

13 Filtered Transmitter Eye Diagram........................................................................................ 14

14 Schematic (1 of 3).......................................................................................................... 15

15 Schematic (2 of 3).......................................................................................................... 16

16 Schematic (3 of 3).......................................................................................................... 17

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List of Figures

ONET1131EC Evaluation Module

ONET1131EC

ROSA

EML TOSA

Thermistor

Out

TEC IN

-2.5-V Charge Pump

I2C Control

EML

Bias IN

Current

Mirror

3.3 V IN

RXOUT

TXIN

Digital

Interface

2.5 V IN

Optical

RX IN

Optical

RX OUT

Hardware and Equipment

1 LED Indicators .............................................................................................................. 13

2 ONET1131EC EVM Bill of Materials..................................................................................... 18

1 Hardware and Equipment

The following hardware and equipment are required to evaluate the EVM:

1. A ONET1131EC EVM

2. An XMD-compliant EML TOSA

3. A USB Dongle

4. A USB cable with standard-A to mini-B connector

5. A PC with USB A port

6. RF cables with SMA connectors

7. An external thermoelectric controller

8. Single-mode fiber patch cords

9. Electrical cables with banana jack connections

2 EVM Block Diagram

Figure 1 represents the block diagram of the ONET1131EC EVM. The board is designed to be powered

from a 2.5-V supply using cables with banana jacks.

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List of Tables

ONET1131EC Evaluation Module

Figure 1. ONET1131EC EVM Block Diagram

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3.3-V

Power

Source for

ROSA

USB Dongle

Connector

Transmitter Inputs

Receiver Outputs

2.5-V Power Source

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3 EVM Connections

Figure 2 shows the location of the major inputs and outputs on the EVM board.

EVM Connections

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Figure 2. ONET1131EC EVM Connections

ONET1131EC Evaluation Module

TEC+

TOSA

Vea GND

Thermistor +

TECí

Thermistor í

Vea

EVM Connections

The customer must supply a ROSA and TOSA. In addition, connections for the EML bias voltage and TEC controller are also required. Figure 3 shows the locations for the ROSA and TOSA, EML bias voltage, TOSA thermistor, and the TEC+ and TEC– connections to the TEC controller.

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Figure 3. TOSA and EML Connections for TEC Controller

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Figure 4 shows the main connections except those for the EML bias and TEC controller.

EVM Connections

ROSA and Receiver connections are not available on the ONET131EC-EVM.

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Figure 4. Main EVM Connections

ONET1131EC Evaluation Module

Measurement Setup

4 Measurement Setup

Follow this procedure to quickly set up to take measurements:

1. Install the ONET1130EC GUI onto the computer and follow the installation instructions.

2. Solder the TOSA onto the EVM.

3. Connect a differential data input signal source to the SMA connectors TXINP/TXINN through 50-Ω matched impedance cables. Set the data rate between 9.8 Gbps and 11.7 Gbps. Set the amplitude between 100 mVp-p differential and 1000 mVp-p differential.

4. Connect the USB dongle to the EVM and attach the interface cable from the USB port of the computer to the mini-B USB port of the dongle.

5. Apply a 2.5-V supply to the +2.5-V banana jack and the supply ground to the GND banana jack.

6. Apply a negative bias voltage in the range of –0.4 V to –1.5 V for the EML to JMP28. The required voltage is TOSA dependent.

7. Connect the TOSA thermistor at JMP24 to the TEC controller.

8. Connect the TEC+ and TEC– at JMP27 to the TEC controller.

9. Connect the TOSA to the optical input of a DCA through a single-mode fiber patch cord. A typical setup is shown in Figure 5.

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ONET1131EC Evaluation Module

Figure 5. Typical Setup

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10. Run the GUI by clicking the ONET1130EC GUI shortcut icon on the desktop. The Low Level Register

Measurement Setup

Interface page appears (Figure 6).

NOTE: The ONET1130EC EVM GUI software works with the ONET1131EC EVM.

Figure 6. Low Level Register Interface Page

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ONET1131EC Evaluation Module

Measurement Setup

4.1 Open Loop Operation Without Fault Detection or Digital Monitoring

The following steps are provided for open loop operation without fault detection or digital monitoring:

1. TI recommends initially operating the TOSA in open loop mode with fault detection disabled.

2. Go to the Core Configuration page as shown in Figure 7.

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Figure 7. Core Configuration Page

3. Set the TX Bias Current Control to Open Loop.

4. Enable the Laser Bias Current.

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5. Go to the Transmitter Configuration page as shown in Figure 8.

Measurement Setup

Figure 8. Transmitter Configuration Page

6. Set TX Output Mode to Single Ended Mode (OUTP) using the pull-down box.

7. Set the desired TX Laser Bias Current with the slider.

8. Set the desired Transmitter Modulation Current with the slider.

9. Adjust the TX Cross Point with the slider.

10. If the transmitter modulation current is less than approximately 0xC0, then TI recommends using the slow edge speed mode as selected with the TX edge speed selection bit. However, the need for using this mode is TOSA dependent.

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ONET1131EC Evaluation Module

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Texas Instruments ONET1131EC User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual