Texas Instruments AFE20408EVM Manual de usuario

EVM User's Guide: AFE20408EVM

AFE20408 Evaluation Module

Description

The AFE20408EVM is an easy-to-use platform to

evaluate the functionality and performance of the

AFE20408 device. The AFE20408EVM has optional

circuits and jumpers to configure the device for

different applications.

The AFE20408 is a highly integrated power-amplifier

monitor and control device capable of temperature,

current, and voltage supervision. The AFE20408 bias

controller features eight digital-to-analog converters

(DAC) with programmable output ranges. The eight

gate bias outputs are switched on and off through

dedicated control pins.

Get Started

1. Order the EVM.

2. Configure EVM jumpers.

3. Install AFE20408EVM GUI from ti.com.

4. Download the latest libraries.

5. Connect USB and external power supplies.

6. Launch AFE20408EVM GUI.

Features

• Configurable circuit to evaluate the AFE20408

• Onboard VDD (5-V) and VIO (3.3-V) support via

USB

• Onboard VSSA and VSSB (−10.5-V or −7-V)

support

• FT4222 easily writes to the AFE using

AFE20408EVM GUI

• External SPI and I2C connections available

Applications

•Macro remote radio unit (RRU)

•Active antenna system mMIMO (AAS)

•Outdoor backhaul unit

•Radar

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AFE20408 Evaluation Module 1

1 Evaluation Module Overview

1.1 Introduction

The AFE20408 supervisor also features a highly-accurate multi-channel analog-to-digital converter (ADC). The

device integrates two high-voltage inputs, two high-side current-sense amplifiers, and an on-chip temperature

sensor.

The function integration and wide operating temperature range make the AFE20408 an excellent choice for an

all-in-one, bias control circuit for the power amplifiers found in RF communication systems.

This user's guide describes the characteristics, operation, and recommended use cases of the AFE20408EVM.

This document provides examples and instructions on how to use the AFE20408EVM board and included

software. Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous

with the AFE20408EVM. This document also includes schematics, the reference printed circuit board (PCB)

layouts, and a complete bill of materials (BOM).

1.2 Kit Contents

Table 1-1 details the contents of the EVM kit. Contact the TI Product Information Center at (972) 644-5580 if any

component is missing. Download the latest versions of the related software on the TI website, www.ti.com.

Table 1-1. AFE20408EVM Kit Contents

Item Quantity

AFE20408EVM board 1

USB micro-B plug to USB-A plug cable 1

1.3 Specification

The EVM is intended to provide basic functional evaluation of the device. The layout is not intended to be a

model for the target circuit, nor laid out for electromagnetic compatibility (EMC) testing. The EVM consists of a

printed-circuit board (PCB), which has the AFE20408 installed.

1.4 Device Information

The documents in Table 1-2 provide information regarding Texas Instruments integrated circuits used in the

assembly of the AFE20408EVM. This user's guide is available from the TI web site under literature number

SLAU917. Any letter appended to the literature number corresponds to the document revision that is current at

the time of the writing of this document. Newer revisions are available from the TI web site at www.ti.com, or call

the Texas Instruments Literature Response Center at (800) 477-8924 or the Product Information Center at (972)

644-5580. When ordering, identify the document by both title and literature number.

Table 1-2. Related Device Documentation

Document Literature Number

AFE20408 product data sheet SLASF96

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2 Hardware

2.1 Hardware Setup

This section describes the overall system setup for the EVM. A personal computer (PC) runs software that

communicates with the FTDI controller onboard using I2C or SPI protocols. External power supplies are required

for certain EVM inputs, such as the VCCA and VCCB supplies.

2.1.1 Hardware Theory of Operation

The AFE20408EVM is connected to the computer through the on-board FTDI digital controller using the

USB cable that is supplied with the EVM. The evaluation board features connectors and test points for all

communication lines, DAC outputs, supplies, and the ADC inputs. Figure 2-1 shows a block diagram of the

AFE20408EVM.

AFE20408 Power Supplies

USB Micro

LDOs

FTDI Controller

Digital

Headers

Supply

Selection

AFE20408 AFE20408

Outputs

AFE20408 ADC

Inputs

Figure 2-1. Theory of Operation Block Diagram

The USB provides the 5-V supply to the EVM. A voltage regulator generates 3.3 V from the USB 5-V supply.

These 5-V and 3.3-V supplies are used to power the FTDI controller. By default, the AFE20408 VDD supply

is powered by the USB 5-V and the VIO supply is powered by the LDO 3.3-V supply through the jumper J13

settings. Alternatively, VDD and VIO can be supplied externally through banana jacks J5 and J8, respectively.

Remove the jumper connector on J13 before connecting external supplies to VDD and VIO. The VSSA and

VSSB supplies can be powered by the on-board voltage regulator with jumper J29. The voltage regulator is

be supplied externally through banana jacks J11 and J12, respectively. Remove the jumper connector on J29

before connecting external supplies to VSSA and VSSB. The remaining device power supplies VCCA and VCCB

must be powered externally through banana jacks J3 and J4, respectively.

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AFE20408 Evaluation Module 3

2.1.2 Jumper Definitions

Table 2-1 shows the jumper definitions of the AFE20408EVM.

Table 2-1. Jumper Definitions

Designator Name Positions

J2 VCCA-GND-VSSA

SHORT 1-2 - VCCA is grounded.

SHORT 2-3 - VSSA is grounded (default).

OPEN - This jumper is closed.

J6 VCCB = VCCA SHORT 1-2 - VCCA and VCCB are connected (default).

OPEN - VCCA and VCCB are not connected.

J9 VCCB-GND-VSSB

SHORT 1-2 - VCCB is grounded.

SHORT 2-3 - VSSB is grounded (default).

OPEN - This jumper is closed.

J13 USB-VDD-VIO

SHORT 1-2 - VIO is connected to on-board 3.3-V (default).

SHORT 3-4 - VDD is connected to on-board 5-V (default).

OPEN - VDD and VIO are powered by external supplies.

No other jumper orientation allowed.

J17 CS - SCL

SHORT 1-2 - Uses the FTDI CS pin for SPI mode (default).

SHORT 2-3 - Uses the FTDI SCL pin for I2C Mode.

OPEN - Open if external communication is used.

J18 SCLK - SDA

SHORT 1-2 - Uses the FTDI SCLK pin for SPI mode (default).

SHORT 2-3 - Uses the FTDI SDA pin for I2C Mode.

OPEN - Open if external communication is used.

J19 I2C ADDR SELECTION

SHORT 1-2 and 11-12 - SPI configuration (default).

SHORT all else - I2C configuration, see Table 2-6 for jumper configurations.

OPEN - Open if external communication is used.

J23 DRVEN DIS

SHORT 1-2 - Connects DRVEN0 to FTDI controller.

SHORT 3-4 - Connects DRVEN1 to FTDI controller.

OPEN - DRVENx is pulled up high (default).

J24 S0+ = HV0 SHORT 1-2 - Connects ADCHV0 and SENSE0+ together.

OPEN - ADCHV0 and SENSE0+ are separate (default).

J28 VNEG Select

SHORT 1-2 - VNEG regulator output is –10.5-V.

SHORT 3-4 - VNEG regulator output is –7-V.

OPEN - VNEG regulator is not used (default).

J29 VSS Select

SHORT 1-2 - VSSA is connected to the VNEG regulator output.

SHORT 3-4 - VSSB is connected to the VNEG regulator output.

OPEN - VSSA and VSSB are powered externally (default).

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2.1.3 Connector Definitions

Table 2-2 shows the power connector definitions of the AFE20408EVM.

Table 2-2. Power Connector Definitions

Designator Definition

J1 USB connector

J3 AFE20408 VCCA supply (3-V to 11-V)

J4 AFE20408 VSSA supply (−11-V to −3-V)

J5 AFE20408 VDD supply (3-V to 5.5-V)

J7 VNEG supply (−10-V to −33-V)

J8 AFE20408 VIO supply (1.65-V to 3.6-V)

J10 AFE20408 Ground

J11 AFE20408 VCCB supply (3-V to 11-V)

J12 AFE20408 VSSB supply (−11-V to −3-V)

When powering the EVM, follow these guidelines:

• Choose between onboard power or external power for VIO and VDD using the J13 jumper. Do not short this

jumper and use external power at the same time.

• The VNEG supply can be used in place of the VSSA and VSSB supplies. Do not short the J29 jumper and

use external supplies for VSSA and VSSB at the same time.

• The VSSA voltage must always be less than (more negative) or equal to the VSSB voltage.

• To operate the group A DACs in the positive range, apply a positive voltage to VCCA and ground VSSA. To

operate the group A DACs in the negative range, apply a negative voltage to VSSA and ground VCCA.

• To operate the group B DACs in the positive range, apply a positive voltage to VCCB and ground VSSB. To

operate the group B DACs in the negative range, apply a negative voltage to VSSB and ground VCCB.

• To operate in the mixed voltage range, the group B DACs must be positive and the group A DACs must be

negative. Apply a positive voltage to VCCB and ground VSSB for the group B DACs, and apply a negative

voltage to VSSA and ground VCCA for the group A DACs.

Table 2-3 shows other connector definitions for the AFE20408EVM. All of these terminal blocks are unpopulated

by default.

Table 2-3. Terminal Block Connector Definitions

Designator Definition

J14 Connector for DACA3, OUTA2, DACA2, and

VSSA

J15 Connector for DACA1, OUTA1, DACA0, and

VSSA

J20 Connector for DACB3, OUTB2, DACB2, and

VSSB

J21 Connector for DACB1, OUTB1, DACB0, and

VSSB

J25 Connector for current sense pins SENSE1+

and SENSE1-

J26 Connector for current sense pins SENSE0-,

SENSE0+, and ADCHV0

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AFE20408 Evaluation Module 5

2.1.4 Test Points

The AFE20408EVM has a variety of test points available for measuring and debugging purposes. Table 2-4

explains the purpose of each test point.

Table 2-4. AFE20408EVM Test Points

Test Point Net Description

TP1 SENSE0+ High side of SENSE0 resistor

TP2 SENSE0- Low side of SENSE0 resistor

TP3 SENSE1+ High side of SENSE1 resistor

TP4 SENSE1- Low side of SENSE1 resistor

TP5 VLDO Output of VNEG regulator

TP6 ADCHV0 ADCHV0 test point

TP7 PAON AFE20408 PAON test point

TP8 VCCA AFE20408 VCCA supply

TP9 VCCB AFE20408 VCCB supply

TP10 VSSA AFE20408 VSSA supply

TP11 VSSB AFE20408 VSSB supply

TP12 SENSE0+ SENSE0+ test point

TP13 SENSE0- SENSE0- test point

TP14, TP15, TP16,

TP17 GND Ground connections

TP18 VIO AFE20408 VIO supply

TP19 VDD AFE20408 VDD supply

TP20 SENSE1+ SENSE1+ test point

TP21 SENSE1- SENSE1- test point

TP22 FTDI_IO2 FTDI GPIO2 testpoint. Can be connected to DRVEN0 by

shorting positions 1-2 on J23 with a jumper

TP23 FTDI_IO3 FTDI GPIO3 testpoint. Can be connected to DRVEN1 by

shorting positions 3-4 on J23 with a jumper

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2.2 Hardware Overview

This section details how to configure the EVM for and voltage outputs using I2C and SPI. The following

subsections provide detailed information on the EVM hardware and jumper positions for the two communication

modes (see also Section 2.1.2).

2.2.1 Electrostatic Discharge Caution

CAUTION

Many of the components on the AFE20408EVM are susceptible to damage by electrostatic

discharge (ESD). Customers are advised to observe proper ESD handling precautions when

unpacking and handling the EVM, including the use of a grounded wrist strap at an approved ESD

workstation.

2.2.2 Connecting the FTDI Digital Controller

To connect the FTDI digital controller on the EVM board to the PC, align and firmly connect the USB connector

to the J3 connector. Verify the connection is snug; a loose connection can cause intermittent operation. A 100

mil header (J22) is available for external communication. Table 2-5 lists the J22 pin definitions. To use external

communcation, disconnect jumpers J17 and J18 to remove the connection to the FTDI controller. Resistors R7

and R9 can be populated for pullups for I2C. These resistors do not need to be populated for the FTDI driver.

Table 2-5. Digital Header J22 Pin Definitions

Designator Definition

2 AFE20408 SCL/CS

4 AFE20408 SDA/SCLK

6 AFE20408 A0/SDI

8 AFE20408 A1/SDO

10 AFE20408 DRVEN0

12 AFE20408 DRVEN1

14 AFE20408 RESET

16 AFE20408 PAON

1,3,5,7,9,11,13,15 Ground

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2.2.3 SPI Configuration

The following figure shows the AFE20408EVM configured for SPI communication.

Figure 2-2. AFE20408EVM Configuration for SPI

2.2.4 I2C Configuration

The following figure shows the AFE20408EVM configured for I2C communication.

Figure 2-3. AFE20408EVM Configuration I2C

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The jumper connections on J19 determine the device address of the AFE20408. The following table shows the

required configuration of the A1 and A0 jumpers for specific device addresses.

Table 2-6. I2C Device Address Map

Device Pins I2C Device Address

A1 A0 [A6:A0]

GND GND 101 0000

GND VIO 101 0001

GND SDA 101 0010

GND SCL 101 0011

VIO GND 101 0100

VIO VIO 101 0101

VIO SDA 101 0110

VIO SCL 101 0111

SDA GND 101 1000

SDA VIO 101 1001

SDA SDA 101 1010

SDA SCL 101 1011

SCL GND 101 1100

SCL VIO 101 1101

SCL SDA 101 1110

SCL SCL 101 1111

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AFE20408 Evaluation Module 9

3 Software

3.1 Software Setup

This section provides the procedure for EVM software installation.

3.1.1 Software Installation

Note

Do not connect the EVM to the PC when the software is installing.

Download the latest version of the EVM graphical user interface (GUI) installer from the Order and start

development subsection of the AFE20408EVM tool folder on TI.com. Run the GUI installer to install the

AFE20408EVM GUI software on your PC. The software installation automatically copies the required LabVIEW™

software files and drivers to the PC.

When the AFE20408EVM GUI is launched, an installation dialog window opens and prompts the user to select

an installation directory. If left unchanged, Figure 3-1 shows that the software location defaults to C:\Program

Files (x86)\Texas Instruments\AFE20408EVM.

Figure 3-1. Software Installation Path

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