Texas Instruments SC70 DAC EVM Manual de usuario

User's Guide

SLAU299–November 2009

SC70 DAC EVM

This document describes the setup and operation of the SC70 DAC Evaluation Module (EVM). It also

discusses the DAC eXerciser Program, a software tool used with the SC70 DAC EVM. Included are the

EVM schematic, bill of materials, and board layout.

Contents

1 EVM Overview ............................................................................................................... 1

1.1 Features ............................................................................................................. 2

1.2 Introduction ......................................................................................................... 2

2 Analog Interface ............................................................................................................. 2

3 Digital Interface .............................................................................................................. 3

4 Power Supplies .............................................................................................................. 3

4.1 DAC Power ......................................................................................................... 3

4.2 Stand-Alone Operation ............................................................................................ 4

5 EVM Operation .............................................................................................................. 4

5.1 Analog Output ...................................................................................................... 4

5.2 Digital Control ...................................................................................................... 4

5.3 SYNC ................................................................................................................ 4

5.4 Default Jumper Locations ......................................................................................... 4

6 Using the SC70 DAC EVM With DXP .................................................................................... 4

6.1 Hardware ............................................................................................................ 5

6.2 MMB0 Power Supplies ............................................................................................ 6

6.3 Software – Running DXP ......................................................................................... 6

6.4 DAC Output Update Options ..................................................................................... 8

7 Bill of Materials and EVM Schematic ..................................................................................... 9

7.1 Bill of Materials ..................................................................................................... 9

7.2 EVM Schematic .................................................................................................... 9

8 Related Documentation from Texas Instruments ..................................................................... 10

List of Figures

1 MMB0 With SC70 DACEVM Installed (NEEDS REPLACING) ....................................................... 6

2 Loading a SC70 DAC EVM Configuration............................................................................... 7

3 SC70 DAC EVM – Frequency/Amplitude and Update Rate Adjustments........................................... 8

4 DAC Output Update Options .............................................................................................. 8

List of Tables

1 Analog Interface............................................................................................................. 2

2 Digital Control ............................................................................................................... 3

3 J3 Power Input .............................................................................................................. 3

4 EVM Default Jumper Settings............................................................................................. 4

5 Output Update Features ................................................................................................... 9

1 EVM Overview

SLAU299–November 2009 SC70 DAC EVM

This datasheet has been downloaded fromhttp://www.digchip.com at this page

Analog Interface

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1.1 Features

• Full-featured evaluation board for a variety of single-channel, 6-pin SC70 DAC, 6- to 14-bit, serial

input, digital-to-analog converters

• Onboard reference and buffer circuits

• High-speed serial interface

• Modular design for use with a variety of DSP and SC70 DAC controller interface boards

1.2 Introduction

The SC70 DAC Evaluation Module is an evaluation board containing all the necessary components to

evaluate the 6-pin, SC70 series of high-performance, digital-to-analog converters from Texas Instruments.

The EVM is designed so that a single printed-circuit board (PCB) supports the entire family of high-speed,

12- and 16-bit serial DACs.

The modular EVM form factor allows for direct evaluation of the DAC's performance and operating

characteristics. This EVM is compatible with the 5-6K Interface Board (SLAU104) from Texas Instruments

as well as the HPA-MCU Interface Board (SLAU106). As part of a SC70 DACEVM-PDK kit, this EVM is

supported on the DXP Platform using the modular motherboard MMB0.

2 Analog Interface

For maximum flexibility, the SC70 DAC evaluation module (EVM) is designed for easy interfacing to

multiple analog sources. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a

convenient 10-pin, dual-row, header/socket combination at J2 (Table 1). This header/socket provides

access to the analog input pins of the ADC. Consult Samtec at www.samtec.com, or call

1-800-SAMTEC-9 for a variety of mating connector options.

Features:

• Full-featured evaluation board for a variety of single-channel, 6-pin SC70 DAC, 6- to 14-bit, serial

input, digital-to-analog converters

• Onboard reference and buffer circuits

• High-speed serial interface

• Modular design for use with a variety of DSP and SC70 DAC controller interface boards

Table 1. Analog Interface

Pin Number Signal Description

J2.2 DAC OUT_A12 Single DAC out option via JP3

J2.4 Unused

J2.6 Unused

J2.8 DAC OUT_A2 Single DAC out option via JP3

J2.10 Unused

J2.12 Unused

J2.14 Unused

J2.16 Unused

J2.18 REF(-) Unused

J2.20 REF(+) External reference source input (2.5 V nominal, 2.525 V maximum)

J2.15 Unused

J2.1–J2.19 (odd) AGND Analog ground connections (except J2.15)

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Digital Interface

3 Digital Interface

The SC70 DAC EVM is designed for easy interfacing to multiple control platforms. Samtec part numbers

SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket

combination at J1. This header/socket provides access to the digital control and serial data pins of the

SC70 DAC EVM. Consult Samtec at www.samtec.com or 1-800-SAMTEC-9 for a variety of mating

connector options.

Table 2. Digital Control

Pin Number Signal Description

J1.1 CS Active-low input to SYNC enables data transfer – jumper configurable (see schematic) via JP1

J1.3 SCLK Serial clock

J1.5 SCLK(R) Serial clock return (for DSP host systems)

J1.7 FS Frame synchronization for DSP host systems – default SYNC input through JP1 (see schematic)

J1.9 FS(R) Frame synchronization return (for DSP host systems)

J1.11 DX Serial data input

J1.13 DR Serial data return (for DSP host systems)

J1.4

J1.10 GND System (EVM) ground

J1.18

4 Power Supplies

The SC70 DAC EVM board requires a single, +5-VDC power supply for proper operation. This 5-V supply

powers the voltage reference (U2) and the external reference buffer (U3). When used in combination with

one of the DAP interface boards, J3 provides connection to the common power bus described in

document SLAA185.Table 3 shows the pinout of J3.

Table 3. J3 Power Input

Signal Pin Number Signal

Unused 1 2 Unused

+5VA 3 4 Unused

GND 5 6 GND

Unused 7 8 Unused

Unused 9 10 Unused

When power is supplied to J3, JP2 allows for one of two different DC voltages to be applied to the DAC

installed on the EVM. Review the schematic and PCB silkscreen for details.

4.1 DAC Power

JP2 allows the user to select the power supply used by the DAC installed in position U1 on the EVM. The

series of DACs supported on this EVM use a single input as both power and reference voltages. When

JP2 is in the default factory position (shunt on pins 1-2), power to the DAC comes from a precision

4.096-V reference. When the shunt on JP2 is moved to pins 2-3, the user may apply an external

power/reference source to the DAC via J2 pin 20.

SLAU299–November 2009 SC70 DAC EVM

EVM Operation

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4.2 Stand-Alone Operation

When used as a stand-alone EVM, the analog power can be applied directly to J3 pin 3 referenced to pin

5. Optimal performance of the EVM requires a clean, well-regulated power source.

CAUTION

The DACs that are compatible with this EVM have a variety of power supply

requirements. Check the appropriate data sheets, and verify all power supplies

are within the safe operating limits of the converter before applying power to

the EVM.

5 EVM Operation

5.1 Analog Output

The analog output from the EVM is applied directly to J2 (top or bottom side) via jumper JP3. The default

condition of the jumper has a shunt placed between pins 1-2, which applies the analog output to J2 pin 2.

Moving the shunt on JP3 to cover pins 2-3 applies the analog output to J2 pin 10.

5.2 Digital Control

The digital control signals can be applied directly to J1 (top or bottom side). The SC70 DAC EVM can also

be connected directly to a DSP or microcontroller capable of supplying the necessary serial control inputs.

Visit the product folder for the EVM or the installed device for a current list of compatible interface and/or

accessory boards.

5.3 SYNC

Jumper JP1 is provided to allow the source selection of the signal applied to the SYNC input of the DAC

installed on the EVM. The factory default condition for the EVM is to place a shunt jumper between pins

1-2 of JP1. This allows the Frame Sync (FS) signal from DSP host systems to be used as the SYNC input

to the DAC. This signal originates from J1.7. When the shunt on JP1 is moved to pins 2-3, a GPIO input

applied via J1.1 can be used to control the SYNC input to the DAC. This feature allows the possibility of

sharing the SPI bus with up to two SC70 DAC EVMs by stacking the boards together.

5.4 Default Jumper Locations

Table 4 provides a list of jumpers found on the EVM and their factory default conditions.

Table 4. EVM Default Jumper Settings

Jumper Shunt Position Jumper Description

JP1 Pins 1-2 Controls SYNC (default is J1.7)

JP2 Pins 1-2 Controls DAC power/reference (default is U2, 4.096 V)

JP3 Pins 1-2 Controls analog output voltage (default is J2.2)

6 Using the SC70 DAC EVM With DXP

The SC70 DAC EVM is compatible with the DAC eXerciser Program (DXP) from Texas Instruments. DXP

is a tool that can generate the necessary control signals required to output various signals and waveforms

from the device installed on the SC70 DAC EVM. The SC70 DAC EVM-PDK kit combines one of the

DAC8411, DAC8311, DAC7311, DAC6311, or the DAC5311 EVM boards with the DSP-based modular

motherboard MMB0. The kit includes the DXP software for evaluation using any available USB port on a

Windows™ XP-based computer.

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Using the SC70 DAC EVM With DXP

DXP is a program for controlling the digital input signals such as the clock, SYNC, and SDI. Wave tables

are built into the DSP software to allow Sine, Ramp, Triangle, and Square wave signals to be generated

by the SC70 DAC. Straight DC outputs can also be obtained.

The SC70 DAC EVM-PDK is controlled by loading a DAC EVM configuration into the MMB0. For complete

information about installing and configuring DXP, see the DXP User's Guide, available for download from

the TI Web site. This section covers the specific operation of the SC70 DAC EVM-PDK.

6.1 Hardware

The hardware consists of two main components: the first is the SC70 DAC EVM itself and the other is a

modular motherboard called the MMB0. The MMB0 board houses a TMS320VC5507 DSP which controls

the serial interface to the device loaded on the EVM board.

The hardware needs to be configured such that the SC70 DAC EVM is plugged onto the MMB0 aligning

female connectors P1, P2, and P3 (bottom side of the SC70 DAC EVM) with male connectors J4, J7, and

J5 on the MMB0.

CAUTION

Exercise caution when assembling the SC70 DAC EVM and MMB0 boards as it

is possible to misalign the connectors.

Do not connect the MMB0 to your PC before installing the DXP software as described in the DXP User’s

Guide. Installing the software ensures that the necessary drivers are properly loaded to run the hardware.

Figure 1. MMB0 With SC70 DACEVM Installed (NEEDS REPLACING)

SLAU299–November 2009 SC70 DAC EVM

Using the SC70 DAC EVM With DXP

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6.2 MMB0 Power Supplies

Several power connections are required for the hardware to work properly. For the MMB0, the supplied

6-V AC/DC converter is all that is necessary. Ensure that J12 on the MMB0 board is closed before

connecting the AC/DC adapter to the DC In connector of the MMB0. This supply provides all power to the

digital portion of the SC70 DAC EVM as well as all necessary power for the DSP. Clean, well-regulated

analog power for the SC70 DAC EVM must be supplied externally via J14 – a 6-position screw terminal

mounted in the lower left corner of the MMB0 board.

CAUTION

When using external power supplies applied to J14 on the MMB0, ensure that

all shorting blocks from J13 are completely removed. Permanent damage to the

MMB0 may occur otherwise.

From left to right, the J14 screw terminal connections are –VA, +VA, +5VA, -5VA, +5VD, and GND. The

SC70 DAC board has power requirements as described in Section 4. The analog +5VA may be applied

directly to the screw terminals at J14 on the MMB0 (referenced to the GND terminal).

For convenience to the SC70 DAC EVM user, the +5VA required for the analog power to the EVM may be

provided through the MMB0. This can be accomplished by placing a shunt jumper on J13B (+5 to +5VA),

which connects the digital 5-V supply to the analog supply input. Due to switching noise, overall

performance of the device installed on the EVM may be compromised.

6.3 Software – Running DXP

Install DXP on a laptop or personal computer running Windows XP as per the detailed instruction in the

DXP User's Guide (SBAU146). Run the DXP program by clicking on the DXP icon on your desktop, or by

browsing to your installation directory.

Before you can generate signals with DXP, a DAC EVM configuration file must be loaded. To load a

configuration file, select the desired DAC from the configuration list under the DAC menu. Choose the

DAC configuration file for the device installed on the EVM as shown in Figure 2.

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Using the SC70 DAC EVM With DXP

Figure 2. Loading a SC70 DAC EVM Configuration

The DXP software defaults to output a 1-kHz sine wave from the DAC; other waveform options include

Square, Saw tooth, Triangle, and DC output options as described in the DXP User's Guide. The frequency

and amplitude of the output waveform is controlled by sliders on the DXP interface. The DAC update rate

can also be modified as shown in Figure 3.

SLAU299–November 2009 SC70 DAC EVM

Using the SC70 DAC EVM With DXP

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Figure 3. SC70 DAC EVM – Frequency/Amplitude and Update Rate Adjustments

6.4 DAC Output Update Options

The DXP software also allows the user to choose several DAC output update options. These are shown in

Figure 4.

Figure 4. DAC Output Update Options

Details on these options are shown in Table 5.

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Bill of Materials and EVM Schematic

Table 5. Output Update Features

Options Detailed Description

Frame Sync The DXP software defaults to Frame Sync update mode. In this mode, the SYNC input of the DAC loaded

on the EVM is controlled by the Frame Sync output of the MMB0. JP1 on the SC70 DAC EVM must be

shorted pins 1-2 to use this option.

Latch with DSP Timer N/A

Latch with External N/A

Timer

Update Rate User Input – enter the desired DAC update rate, 1MSPS is the default

7 Bill of Materials and EVM Schematic

The following table contains a complete bill of materials for the SC70 DAC EVM. The schematic diagram

is also provided for reference.

7.1 Bill of Materials

Designators Description Manufacturer Mfg. Part Number

C1, C2 0.1 µF, 0603, Ceramic, 50V, X7R, 10% Murata GRM188R71H104KA93D

C3 0.47 µF, 0603, Ceramic, 25V, X7R, 10% Murata GRM188R71E474KA12D

C4, C6 1 µF, 0603, Ceramic, 16V, X5R, 10% TDK C1608X5R1C105K

C5 10 µF, 0805, Ceramic, 10V, X5R, 10% Taiyo Yuden LMK212BJ106KD-T

C7 10 µF, 0603, Ceramic, 6.3V, X5R, 20% TDK C1608X5R0J106M

J1 J2 (Top Side) 10 Pin, Dual Row, SM Header (20 Pos.) Samtec TSM-110-01-T-DV-P

J3 (Top Side) 5 Pin, Dual Row, SM Header (10 Pos.) Samtec TSM-105-01-T-DV-P

J1 J2 (Bottom Side) 10 Pin, Dual Row, SM Header (20 Pos.) Samtec SSW-110-22-F-D-VS-K

J3 (Bottom Side) 5 Pin, Dual Row, SM Header (10 Pos.) Samtec SSW-105-22-F-D-VS-K

JP1, JP2, JP3 3 Pin 0.1inch, Header Samtec TSW-103-07-T-S

R1 NI

R2 10 kΩ, 0603, 1/10W, 1% Yageo RC0603FR-0710KL

R3, R4, R8, R9, R10 NI

R5, R6, R7, R11 0 Ω, 0603, 1/10W, 5% Yageo RC0603JR-070RL

R12 1.5 Ω, 0603, 1/10W, 5% Yageo RC0603JR-071R5L

TP1 TEST POINT PC MINI 0.040" D RED Keystone 5000

TP2, TP3 TEST POINT PC MINI 0.040" D BLACK Keystone 5001

U1 Various – See (1) TI Various

U2 IC PREC V-REF 4.096V LN 8-SOIC TI REF5040AID

U3 IC OPAMP GP R-R 44MHZ SOT23-5 TI OPA353NA/250

(1) The device installed at location U1 is dependent on the EVM ordered. This device is soldered to the board for best performance. U1 may

be replaced with any device listed in the EVM Compatible Device Data Sheets table found at the end of this document.

7.2 EVM Schematic

The SC70 DAC EVM schematic appears on the last page of this document.

SLAU299–November 2009 SC70 DAC EVM

1 2 3 4 5 6

654321

12500 TI Boulevard. Dallas, Texas 75243

Title:

S EET: OF:

FILE: SIZE:DATE:

REV:

5-Nov-2009

Drawn By:

Engineer:

Revision istory

REV ECN Number Approved

SC70-6 DAC Rev 2.Sch

DOCUMENTCONTROL #

+5VA

1 2

3 4

5 6

7 8

9 10

11 12

13 14

15 16

17 18

19 20

OUTPUT EADER

FSX

10uF

SC70-6 DAC EVM

+REFin

CLKX

CLKR

FSR

R5 0

R6 0

OUT_A1

OUT_A2

OUT_A 1 2

3 4

5 6

7 8

9 10

11 12

13 14

15 16

Serial eader

TP1

VCC

1 2

3 4

5 6

7 8

9 10

VSS+5VA -5VA +5VD+3.3VD+1.8VD +3.3VA

JP1

JP3

TP2

TP3

R7 0

DIN

SCLK

/SYNC

R10

6498629

+5VA

T. endrick

0.1uF

0.47µF

GND

Vout

SYNC 1

DIN 3

SCLK 2

AVDD/VREF

DUT

R2 10K

GND

TRIM 5

NC 7

NC 8

TEMP

3OUT

V+ 2

REF5040ID

2 5

OPA353

1uF

DAC8411

DAC8311

DAC7311

DAC6311

DAC5311

R4 NI

R3 NI

JP2

AVdd

1uF

R11 0

L. Parker

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