Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsDev KitsPCB design board

User's Guide

SNAU020–September 2013

ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS

Sigma-Delta Analog-to-Digital Converter

This Evaluation Board is used to evaluate one of the A/D Converter ADC12EU050. The ADC is a 12 bit

converter that provides data at a rate of 45 MHz.

The evaluation board is designed to be used with the WaveVision5™ Data Capture Board which is

connected to a personal computer through a USB port and running WaveVision5™ software, operating

under Microsoft Windows. The software can perform an FFT on the captured data upon command and, in

addition to a frequency domain plot, shows dynamic performance in the form of SNR, SINAD, THD SFDR

and ENOB.

Contents

1 Board Assembly ............................................................................................................. 2

2 Quick Start ................................................................................................................... 2

3 Functional Description ...................................................................................................... 3

3.1 Analog Input ........................................................................................................ 3

3.2 ADC Reference ..................................................................................................... 3

3.3 ADC Input Clock ................................................................................................... 3

3.4 Power Supply Connections ....................................................................................... 4

3.5 Reset ................................................................................................................ 4

3.6 Sleep ................................................................................................................. 4

3.7 Input Common Mode .............................................................................................. 5

3.8 Default Jumper and Switch Settings ............................................................................ 5

4 Software and SPI Registers ............................................................................................... 5

4.1 SPI Registers ....................................................................................................... 5

5 Hardware Schematics ...................................................................................................... 6

6 Evaluation Board Layout ................................................................................................... 9

7 Evaluation Board Bill of Materials ....................................................................................... 13

List of Figures

1 Major Component Locations............................................................................................... 2

2 Input clock circuit............................................................................................................ 3

3 Power Supply Connections ................................................................................................ 4

4 Schematic - 1 of 3 .......................................................................................................... 6

5 Schematic - 2 of 3 .......................................................................................................... 7

6 Schematic - 3 of 3 .......................................................................................................... 8

7 Layer 1: Top ................................................................................................................. 9

8 Layer 2 : Internal Ground Plane ......................................................................................... 10

9 Layer 3 : Internal Power Plane .......................................................................................... 11

10 Layer 4: Bottom............................................................................................................ 12

List of Tables

1 Board Jumpers and Switches ............................................................................................. 5

2 Bill of Materials............................................................................................................. 13

SNAU020–September 2013 ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analog-

to-Digital Converter

Submit Documentation Feedback

Summary of content (14 pages)

PAGE 1
User's Guide SNAU020 – September 2013 ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analog-to-Digital Converter This Evaluation Board is used to evaluate one of the A/D Converter ADC12EU050. The ADC is a 12 bit converter that provides data at a rate of 45 MHz. The evaluation board is designed to be used with the WaveVision5™ Data Capture Board which is connected to a personal computer through a USB port and running WaveVision5™ software, operating under Microsoft Windows.
PAGE 2
Board Assembly 1 www.ti.com Board Assembly The ADC12EU050 Evaluation Board comes pre-assembled. Refer to the Bill of Materials in Section 7 for a description of components, to Figure 1 for major component placement and to Section 5 for the Evaluation Board schematic. Input Clock circuitry Inputs ADC12EU050 WV5 Connector Hardware Reset Sleep Power Connectors Figure 1. Major Component Locations 2 Quick Start Refer to Figure 1 for locations of jumpers, test points and major components.
PAGE 3
Functional Description www.ti.com 3 Functional Description The ADC12EU050 Evaluation Board schematic is shown in Section 5. A list of default switch and jumper settings can be found in Section 3.8. 3.1 Analog Input The analog input is supplied through standard SMA connectors. The evaluation board is designed for single ended inputs, which are converted to differential by the transformers.
PAGE 4
Functional Description 3.4 www.ti.com Power Supply Connections +1.8V Digital Ground +1.2V Digital Ground +1.2V Analog Ground Power to the board is supplied through the power connectors P14, P16 and P18. The required voltages are shown in Figure 3 and described underneath. Figure 3. Power Supply Connections P14: Analog power and ground • ADC12EU050 analog supply, VA. • Connect VA to 1.
PAGE 5
Software and SPI Registers www.ti.com 3.7 Input Common Mode Jumper P21 can be used to force a common mode on the ADC inputs. In its default configuration, the evaluation board has capacitively coupled ADC inputs, and using the Input Common Mode jumper will not have any effect. 3.8 Default Jumper and Switch Settings On delivery, the board’s jumpers and switches should be set as defined in Table 1. Any directions are defined when the board is positioned as in Figure 1. Table 1.
PAGE 6
Hardware Schematics 5 www.ti.com Hardware Schematics ADC12EU050 Figure 4.
PAGE 7
Hardware Schematics www.ti.com Figure 5.
PAGE 8
Hardware Schematics www.ti.com Figure 6.
PAGE 9
Evaluation Board Layout www.ti.com 6 Evaluation Board Layout Figure 7.
PAGE 10
Evaluation Board Layout www.ti.com Figure 8.
PAGE 11
Evaluation Board Layout www.ti.com Figure 9.
PAGE 12
Evaluation Board Layout www.ti.com Figure 10.
PAGE 13
Evaluation Board Bill of Materials www.ti.com 7 Evaluation Board Bill of Materials Table 2. Bill of Materials QTY. Designator Footprint Value Description 1 *1 QFN10X10-68 ADC12EU050 ADC 48 C1–C31, C33–C40, C42–C44, C46–C49, C51, C53, C55 CC1608-0603 100nF Capacitor (Semiconductor SIM Model) 1 C28 CC3216-1206 10uF Capacitor (Semiconductor SIM Model) 6 C32, C41, C45, C50, C52, C54 CC3225-1210 47uF Capacitor (Semiconductor SIM Model) 1 IC1 CSX750FJC Citizen CSX750FJC50.
PAGE 14
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.