Texas Instruments ADC161S626 Manuale utente

ADC161S626EVM User's Guide

User's Guide

Literature Number: SNOU130A

July 2014–Revised February 2015

Contents

1 Introduction......................................................................................................................... 5

2 Board Connectors and Components ...................................................................................... 6

2.1 Power Supply Input – VA, VIO ......................................................................................... 7

2.2 Reference Voltage – VREF............................................................................................. 7

2.3 The Driving Circuit about LM8350 ..................................................................................... 8

2.4 The Interface between LM8350 and ADC161S626.................................................................. 8

2.5 The ADC161S626 Circuit ............................................................................................... 9

3 Software Installation........................................................................................................... 10

3.1 Graphical User Interface (GUI) ....................................................................................... 10

3.2 Launchpad Firmware Update ......................................................................................... 11

3.3 Update USB Driver ..................................................................................................... 13

4 Board Setup and Operation ................................................................................................. 15

4.1 Board Setup ............................................................................................................. 15

4.2 Launching the Software................................................................................................ 16

5 Board Layout..................................................................................................................... 19

6 Schematic ......................................................................................................................... 24

7 Bill of Materials .................................................................................................................. 25

Revision History.......................................................................................................................... 26

2Table of Contents SNOU130A–July 2014–Revised February 2015

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List of Figures

1 ADC161S626 Evaluation Board ........................................................................................... 6

2 5 V and 3.3 V Power Supply ............................................................................................... 7

3 Reference Voltage VREF................................................................................................... 7

4 The Driving Circuit about LM8350......................................................................................... 8

5 The Interface between LM8350 and ADC161S626 ..................................................................... 8

6 The ADC161S626 Circuit................................................................................................... 9

7 ADC1x1S62x Installation Directory ...................................................................................... 10

8 ADC1x1S62x Installation Finish.......................................................................................... 11

9 USB Firmware Upgrade Window......................................................................................... 12

10 Driver Not Installed......................................................................................................... 13

11 Driver Authentication Warning............................................................................................ 14

12 Example COM Port Number.............................................................................................. 14

13 ADC161S626EVM Hardware Connection .............................................................................. 15

14 The Main Menu of ADC1x1S62x Software ............................................................................. 16

15 Selectable Fields in GUI................................................................................................... 17

16 Testing in the GUI.......................................................................................................... 18

17 Top Assembly Layer....................................................................................................... 19

18 Top Layer Routing ......................................................................................................... 20

19 Power Layer Routing ...................................................................................................... 21

20 Ground Layer Routing ..................................................................................................... 22

21 Bottom Layer Routing...................................................................................................... 23

22 ADC161S626EVM DUT Schematic...................................................................................... 24

SNOU130A–July 2014–Revised February 2015 List of Figures

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List of Tables

1 Device and Package Configurations ...................................................................................... 5

2 ADC161S626EVM Bill of Materials ...................................................................................... 25

4List of Tables SNOU130A–July 2014–Revised February 2015

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1 Introduction

The Texas Instruments ADC161S626EVM evaluation module (EVM) helps designers evaluate the

operation and performance of the ADC161S626. The ADC161S626 is a 16-bit, 50kSPS to 250kSPS

sampling Analog-to-Digital (A/D) converter. The converter uses a successive-approximation register (SAR)

architecture, based upon capacitive redistribution and containing an inherent sample-and-hold function.

The differential nature of the analog inputs is maintained from the internal sample-and-hold circuits

throughout the A/D converter to provide excellent common-mode signal rejection.

The EVM contains an LMP8350 and an ADC161S626. The LMP8350 is an ultra-low distortion, fully-

differential amplifier designed for driving high-performance precision analog-to-digital converters (ADC).

The user can use the LMP8350 to drive the ADC, or test the performance of ADC161S626 directly. The

evaluation board communicates with the MSP430’s Launch-Pad through the SPI interface.

Table 1. Device and Package Configurations

COMPONENTS IC PACKAGE

U1 ADC161S626CIMM VSSOP-10

U2 LMP8350MA SOIC-8

SNOU130A–July 2014–Revised February 2015 List of Tables

Board Connectors and Components

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2 Board Connectors and Components

This section describes the functions, jumpers, and connectors on the ADC161S626EVM. The top view of

this board is shown in Figure 1. The detailed introductions for each part are shown as follows.

Figure 1. ADC161S626 Evaluation Board

6List of Tables SNOU130A–July 2014–Revised February 2015

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Board Connectors and Components

2.1 Power Supply Input – VA, VIO

The EVM is powered by a launch pad through the 5 V pin and the 3.3 V pin. The single analog (VA)

supply is connected with 5 V pin while the digital input/output (VIO) supply is connected with 3.3 V pin.

Figure 2. 5 V and 3.3 V Power Supply

2.2 Reference Voltage – VREF

The reference pin VREF should be supplied by external voltage through the test point VREF-EXT while

pin 1 and pin 2 in the JVREF header should be shorted. Otherwise, the VREF pin should be connected

with the U3 (LM4120AIM5-4.1), a 4.096 V precision micro-power low dropout voltage reference when pin

2 and pin 3 in the JVREF header are shorted.

Figure 3. Reference Voltage VREF

SNOU130A–July 2014–Revised February 2015 List of Tables

Board Connectors and Components

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2.3 The Driving Circuit about LM8350

The input signal can be connected with the J1 header. R3 and R4 are used for the single-ended input

signal. R5, R6, R7, and R8 are used as the input resister and feedback resister, which determine the gain

of the circuit. These are all 1k ohm, so the gain is one. R1 and R2 consist of the voltage divider, to

determine the power mode of the LM8350 by connecting the EN pin. C17 is the bypass capacitor from

VOCM to ground. C8, C9, and C10 are the bypass capacitors of power supply.

Figure 4. The Driving Circuit about LM8350

2.4 The Interface between LM8350 and ADC161S626

The standard 100 mils header J2 is the interface between LM8350 and ADC161S626. Pin 1 and pin 5 are

the differential output of LM8350. The OUT+ and OUT- are test points to probe the LM8350 differential

output. Pin 2 and pin 4 are the differential input of ADC161S626. The user can select LM8350 to drive

ADC, just shorting pins 1-2 and pins 4-5. Otherwise the user could test the performance of the

ADC161S626 directly when pin 2 and pin 4 are connected with an input differential signal. Pin 3 is GND.

Figure 5. The Interface between LM8350 and ADC161S626

8List of Tables SNOU130A–July 2014–Revised February 2015

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Board Connectors and Components

2.5 The ADC161S626 Circuit

The R9, R10, and C11 are the anti-aliasing filter for the differential input of the ADC161S626. C15 and

C16 are the bypass capacitors of reference voltage VREF. C13 and C14 are the bypass capacitors of the

analog supply and digital input/output supply, respectively. The ADC161S626 communicates with the

launch pad through the 3 wire SPI interface (SCLK, DOUT and CS).

Figure 6. The ADC161S626 Circuit

SNOU130A–July 2014–Revised February 2015 List of Tables

Software Installation

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3 Software Installation

3.1 Graphical User Interface (GUI)

Install the ADC1x1S62x software before connecting the ADC161S626EVM board to the PC. Download the

ADC1x1S62x software from TI’s website at http://www.ti.com/product/adc161s626. Follow these steps to

install the ADC161S626EVM software:

1. Click http://www.ti.com/product/adc161s626, scroll down to the Software section, and download the

latest evaluation software.

2. Unzip the downloaded file into a known directory, and run the setup.exe file located in [Unzip

location]\ADC161S626EVM\EVM_GUI\ADC1x1S62x Installer\Volume. Follow the pop-screen

instructions by clicking the Next button to install the software.

Figure 7. ADC1x1S62x Installation Directory

10 List of Tables SNOU130A–July 2014–Revised February 2015

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