Texas Instruments DAC7562EVM Manuale utente

User's Guide

SBAU183A–May 2011–Revised June 2011

DAC7562EVM, DAC8562EVM

DAC8562EVM

This user's guide describes the characteristics, operation, and use of the DAC8562EVM. The evaluation

model (EVM) is an evaluation board for the DAC7562 and DAC8562. The DAC7562 and DAC8562 are

low-power, voltage-output, 12- or 16-bit digital-to-analog converters (DACs). These converters are

controlled through a serial peripheral interface (SPI) that can operate at clock rates of up to 50MHz.

Additionally, these DACs include a 2.5V internal reference voltage (disabled by default), giving a full-scale

output range of 5V when placed in a gain of two configuration. The EVM allows evaluation of all aspects of

the device and allows user control over every pin on the DAC7562/DAC8562. Complete circuit

descriptions, schematic diagrams, and bills of material are included in this document.

The following related documents are available for download through the Texas Instruments web site at

http://www.ti.com.

EVM-Related Device Data Sheets

Device Literature Number

DAC7562 SLAS719A

DAC8562 SLAS719A

REF5025 SBOS410D

OPA379 SBOS347D

All trademarks are the property of their respective owners.

SBAU183A–May 2011–Revised June 2011 DAC7562EVM, DAC8562EVM

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Contents

1 EVM Overview ............................................................................................................... 3

2 Analog Interface ............................................................................................................. 3

3 Digital Interface .............................................................................................................. 4

4 Power Supplies .............................................................................................................. 5

5 Voltage Reference .......................................................................................................... 6

6 EVM Operation .............................................................................................................. 7

7 Schematics and Layout .................................................................................................... 9

List of Figures

1 Reference Selection Jumper JP3......................................................................................... 6

2 DAC8562EVM Default Jumper Locations ............................................................................... 8

3 DAC8562EVM: Top Layer Image ....................................................................................... 10

4 DAC8562EVM: Bottom Layer Image ................................................................................... 10

List of Tables

1 J1: Analog Interface Pinout................................................................................................ 3

2 J2.3: Serial Interface Pins.................................................................................................. 4

3 J3 Configuration: Power-Supply Input.................................................................................... 5

4 DAC8562EVM Jumpers.................................................................................................... 7

5 Bill of Materials ............................................................................................................. 9

2DAC7562EVM, DAC8562EVM SBAU183A–May 2011–Revised June 2011

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EVM Overview

1 EVM Overview

1.1 Features

DAC8562EVM:

•Full-featured evaluation board for the DAC7562 or DAC8562

•Onboard optional external reference selection

•Wide selection of digital and I/O voltages

•Hardware or software control of control logic

•Compatible with the TI Modular EVM System

•Onboard optional bipolar circuit configuration (requires installing components)

This manual covers the operation of the DAC8562EVM. For simplicity, the DAC7562 and DAC8562 are

referred to as DACx562 throughout this document; unless otherwise noted, the information applies to

either DAC device. Additionally, the abbreviation EVM and the term evaluation module are synonymous

with the DAC8562EVM.

1.2 Introduction

The DACx562 series of devices are 10-pin, 12-, 14-, or 16-bit, low-power, two-channel digital-to-analog

converters (DACs) that operates from a single 2.7V to 5.5V supply. These DACs include a 2.5V internal

reference voltage (disabled by default), giving a full-scale output range of 5V when placed in a gain of two

configuration. The EVM is designed to highlight both the features of the small,10-pin QFN package that

the DACx562 is available in, and the performance of either the 12-bit or 16-bit DAC. Digital communication

is controlled through a three-wire SPI protocol allowing for speeds up to 50MHz.

The DAC8562EVM is designed to give the user access to all pins on the DACx562. The evaluation

module allows the user to control the DAC logic using onboard jumpers, or digitally through the J2 header.

By default, the evaluation module is configured to be used with an onboard 2.5V external reference, but

can be easily modified to use the DAC internal reference by changing a jumper setting and enabling the

internal reference using software.

The DAC8562EVM is an evaluation module built to the TI Modular EVM System specification. It can be

connected to any modular EVM system interface card. The DAC8562EVM does not have an onboard

microprocessor and cannot run software by itself. To connect it to a computer, some type of interface is

required.

2 Analog Interface

For maximum flexibility, the DAC8562EVM can interface to multiple analog sources. Samtec part numbers

SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a 10-pin, dual-row, header at J1. This header

provides access to the analog input and output pins of the DACx562. Consult Samtec at

http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options. Table 1

summarizes the pinouts for analog interface J1.

Table 1. J1: Analog Interface Pinout

Pin Number Signal Description

J1.2 VOUT-0 Analog output 0

J1.4 VOUT-1 Analog output 1

External reference source input for

J1.20 VREFIN/VREFOUT VREFIN/VREFOUT

J1.1-1.13 (odd) GND Analog ground connection

J1.17-1.19 (odd) GND Analog ground connection

J1.6-1.18 (even) N/A —

Op amp bipolar output (requires

J1.10 N/A installed components)

J1.12 - J1.18 (even) N/A —

J1.15 VREF Buf Buffered internal reference voltage

SBAU183A–May 2011–Revised June 2011 DAC7562EVM, DAC8562EVM

Digital Interface

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The analog interface is populated on both the top and the bottom sides of the evaluation board. All of the

output pins of the DACx562 are routed directly to the J1 connector.

The GND pins of the DACx562 are connected directly to the ground of the evaluation board.

The DAC8562EVM is designed to allow the user to choose from using the DACx562 internal reference,

the onboard 2.5V REF5025, or a user-supplied external reference source for the DAC. Depending on how

the DACx562 is configured, pin J1.20 is either an input or an output. If the DACx562 internal reference is

used, then J1.20 is the output of the VREFIN/VREFOUT pin on the DAC. If an external reference is used, other

than the onboard REF5025, J1.20 is used to provide the external reference voltage.

Additionally, the evaluation board contains an OPA379 in a buffer configuration to condition the internal

reference if the user would like to use the signal to drive another component. The buffered signal is routed

to pin J1.15.

If the DACx562 bipolar circuit is installed on the EVM, the output of the installed operational amplifier is

routed to pin J1.10 on the J1 connector.

3 Digital Interface

3.1 Serial Peripheral Interface

Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a 10-pin, dual-row,

header/socket combination at J2. This header/socket provides access to the digital control data pins from

both J2A (top side) and J2B (bottom side) of the connector. Consult Samtec at http://www.samtec.com or

call 1-800-SAMTEC-9 for a variety of mating connector options. Table 2 describes the serial interface

pins.

Table 2. J2.3: Serial Interface Pins

Pin No. Signal Name I/O Type Pull-Up Function

J2.1 SYNC0 In None DACx562 SYNC signal. Jumper

JP5 determines SYNC pin

J2.3 SCLK In None DACx562 SCLK signal

J2.5 SCLK In None DACx562 SCLK signal

J2.7 SYNC1 In None DACx562 SYNC signal. Jumper

JP5 determines SYNC pin

J2.9 SYNC2 In None DACx562 SYNC signal. Jumper

JP5 determines SYNC pin

J2.11 SDI In None DACx562 DIN signal

J2.15 LDAC1 In High DACx562 LDAC signal. Jumper

JP6 determines LDAC control pin

J2.17 LDAC2 In High DACx562 LDAC signal. Jumper

JP6 determines LDAC control pin

J2.19 CLR In High DACx562 CLR signal.

J2.2 Unused — — —

J2.6 to J2.8 (even) Unused — — —

J2.12 to J2.16 (even) Unused — — —

J2.20 Unused — — —

J2.4, J2.10, J2.18 GND In/Out None Ground

The DACx562 is controlled through a serial peripheral interface using the pins available on the J2 header.

The four SPI signals are connected to the DAC I/O signals through 33Ωseries resistors. The SYNC signal

can be routed to one of three pins on the J2 header: J2.1, or J2.7 and J2.9. The SCLK signal is routed to

both J2.3 and J2.5. The DIN signal is routed to the J2.11 pin on the J2 header.

4DAC7562EVM, DAC8562EVM SBAU183A–May 2011–Revised June 2011

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Power Supplies

There are two static I/O pins, LDAC and CLR, from the DACx562 that are routed to the J2 header. Both of

signals have weak pull-up resistors to the AVDD power-supply voltage. Either of these signals can be

pulled down using hardware jumpers or applying signals to the J2 header. Note that these signals are

edge-triggered.

The CLR pin is routed to pin J2.19. The LDAC pin is routed to either J2.15 or J2.17, selectable using the

JP6 onboard jumper. Updating the DACx562 output can be completed in one of three different ways. The

LDAC pin can be held low, and the output then update immediately following the last SCLK of the data

word. Alternatively, the LDAC can be held high, the DAC input register can be written to, and the output

then updates once the LDAC signal is brought low. A third technique is to overwrite the LDAC pin using

either register settings or DACx562 commands. See the product data sheet for more information.

4 Power Supplies

J3 is the power-supply input connector. Table 3 lists the configuration details for J3. The voltage inputs to

the DAC can be applied directly to the device. The DACx562 requires only one power supply to operate.

Table 3. J3 Configuration: Power-Supply Input

Pin No. Pin Name Function Required

J3.1 +VA +VA analog supply Optional

J3.2 –VA –VA analog supply Optional

J3.3 +5VA +5V analog supply Yes

J3.4 –5VA -5V analog supply No

J3.5 DGND Digital ground input Yes

J3.6 AGND Analog ground input Yes

J3.7 +1.8VD 1.8V digital supply No

J3.8 +3.3VD 3.3V digital supply No

J3.9 VD1 Not used No

J3.10 +5VD +5V No

The digital and analog ground inputs are short-circuited internally through a ground plane.

The DAC8562EVM is designed to operate from a single +5V power supply (J3.3). This supply powers the

DACx562 itself, and the onboard REF5025 reference voltage source.

The DACx562 can be powered from a wide range of voltages from +2.7V to +5.5V. The onboard REF5025

is powered from the +5VA supply on the J3 header. Jumper JP4 is in place to allow users to choose

between the +5VA voltage to power the DAC or a separate, external power supply applied to TP1. This

flexibility allows the user to be able to properly power the REF5025 while powering the DAC from any

desired voltage within the specified range. The DAC8562EVM is not designed with any filters, so the use

of a clean, well-regulated supply is strongly recommended.

The +VA and –VA supplies are only used to power the optional external op amp, U4, and that is only if the

bipolar circuit is installed. Currently, the op amp is uninstalled and the EVM board does not require the

+VA and –VA supplies. If the op amp is installed, J3.1 and J3.2 must be powered by ±15V in order for the

bipolar circuit to be functional.

SBAU183A–May 2011–Revised June 2011 DAC7562EVM, DAC8562EVM

Voltage Reference

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5 Voltage Reference

The DAC8562EVM has a variety of reference voltage options. The 2.5V internal reference can be used;

the onboard REF5025 reference voltage can be used as an external source for the DAC; or the user can

input his own external reference voltage to the J1 header. Note that on the evaluation board, there is no

additional reference filtering or an op amp to drive the reference. This flexibility allows the user to have the

option to drive the reference directly with his own source.

The ability to have the DACx562 use its internal reference allows the VREFIN/VREFOUT to be configured as

either an input or an output. When the 2.5V internal reference voltage is used, the pin is an output. When

the DACx562 is configured to use an external reference voltage and the internal reference is disabled, the

pin is an input. Enabling and disabling the DACx562 internal reference is controlled internally through the

DAC registers and can be changed through the SPI communication protocol. Jumper JP3 must be set

accordingly, depending on the configuration of the reference voltage.

By default, the ability to have the DACx562 use its internal reference is disabled, and requires an external

reference voltage. Jumper JP3 controls which external reference source is used. When JP3 is in the 2-3

position (default), the REF5025 is used. When JP3 is in the 1-2 position, the user can input his own

reference voltage to analog header pin J1.20; this reference will then be routed to the DAC8562.

To enable the DACx562 internal reference voltage, make sure that jumper JP3 is either floating or

connected in the 1-2 position. This configuration avoids driving the VREFIN/VREFOUT pin with the onboard

reference voltage when the DACx562 has the VREFIN/VREFOUT pin configured as an output. That signal is

conditioned through an onboard OPA379 before it is routed to pin J1.15 on the J1 header. This option

allows the user to drive external components without having to be concerned about the internal reference

source/sink capability.

NOTE: Do not place jumper JP3 in the 2-3 position while using the internal reference. If JP3 is in

the 2-3 position when the internal reference is used, the user will be attempting to drive the

VREFIN/VREFOUT pin externally while it is configured as the internal reference voltage output. This

condition may cause permanent damage to the DACx562.

Figure 1. Reference Selection Jumper JP3

6DAC7562EVM, DAC8562EVM SBAU183A–May 2011–Revised June 2011

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EVM Operation

6 EVM Operation

This section provides information on the analog input, digital control, and general operating conditions of

the DAC8562EVM.

6.1 Analog Output

The DACx562 has two analog outputs that are available at the J1 header. Each of these outputs are

referenced to the board ground. Additionally, the J1 header is also used to either input an external

reference voltage, or read back the internal reference voltage of the DACx562. Depending on the JP3

configuration and the DACx562 internal reference status, the J1.19 pin may be used to input an external

source. The J1.15 pin is used to read back the DAC buffered internal reference when it is enabled.

The DAC8562EVM also has the option to install a bipolar circuit to evaluate using the DACx562 in bipolar

applications. After the necessary components are installed, the bipolar output from the external

operational amplifier is routed to J1.10.

6.2 Digital Control

The digital control signals can be applied directly to J2 (top or bottom side). The modular DAC8562EVM

can also be connected directly to a DSP or microcontroller interface board, such as the MMB0 DSP board

available from Texas Instruments.

No specific evaluation software is provided with this EVM. However, various code examples are available

that show how to use EVMs with a variety of digital signal processors from Texas Instruments. Check the

respective product folders on the TI web site or send an e-mail to [email protected] for a listing of

available code examples. The EVM Gerber files are available on request.

6.3 Default Jumper Settings and Switch Positions

Table 4 lists the jumpers and the functionality of each that is available on the DAC8562EVM.

Table 4. DAC8562EVM Jumpers

Jumper Name Description

JP1 LDAC Control LDAC control pin; pulled high by default.

Apply shunt to tie pin to ground.

JP2 CLR Control CLR control pin; pulled high by default.

Apply shunt to tie pin to ground.

JP3 REF Selection DAC reference selection control

JP4 AVDD Selection AVDD selection control

JP5 SYNC Control Routes SYNC control to use either J2.1 or

J2.7 and J2.9

JP6 LDAC Control Routes LDAC control to either J2.15 or

J2.17

SBAU183A–May 2011–Revised June 2011 DAC7562EVM, DAC8562EVM

EVM Operation

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Figure 2 shows the default jumper conditions for the DAC8562EVM.

Figure 2. DAC8562EVM Default Jumper Locations

The DAC8562EVM board has six onboard hardware jumpers that are used to control the power options

and digital I/O signals. Two position jumpers, JP1 and JP2, are used to control whether to pull the LDAC

and CLR signals high or low. Leave the jumpers open to pull the corresponding signal high, or apply a

shunt across the jumper to tie the signal low.

JP3 routes where the VREFIN/VREFOUT I/O pin on the DACx562 is routed. When JP3 is in its default position,

the shunt is placed across pins JP3.2 and JP3.3. This configuration allows the DACx562 to use the

onboard REF5025 as the external reference. When JP3 is in the 1-2 position, the user can input an

external reference voltage to analog header pin J1.20, which is then routed to the DAC. If the DACx562

internal reference is enabled, the user must ensure that jumper JP3 is either floating or connected in the

1-2 position. The internal reference voltage is then buffered through the OPA379 and routed to J1.20. It is

important to not have jumper JP3 in the 2-3 position while using the internal reference. You cannot drive

the VREFIN/VREFOUT pin externally while it is configured as the internal reference voltage output. Doing so

may permanently damage the DAC8562.

The DAC AVDD power source is controlled by jumper JP4. By default, AVDD is powered from J3.3 (JP4

position 1-2). It can also be powered from TP1 if the shunt is placed across pins 2-3.

The SYNC signal can either be routed to the J2.1 pin or the J2.7 and J2.9 pins. This routing option is

controlled using the JP5 jumper.

Jumper JP6 selects where to route the LDAC signal. By default, pins JP6.2 and JP6.3 are connected to

route the LDAC signal to J2.17. The shunt can be placed across JP6.1 and JP6.2 to route the LDAC

signal to J2.15.

8DAC7562EVM, DAC8562EVM SBAU183A–May 2011–Revised June 2011

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Schematics and Layout

7 Schematics and Layout

Schematics for the DAC8562EVM are appended to this user's guide. Figure 3 and Figure 4 are the printed

circuit board (PCB) layouts. The bill of materials is provided in Table 5.

7.1 Bill of Materials

NOTE: All components should be compliant with the European Union Restriction on Use of

Hazardous Substances (RoHS) Directive. Some part numbers may be either leaded or

RoHS. Verify that purchased components are RoHS-compliant. (For more information about

TI's position on RoHS compliance, see the Quality and Eco-Info information on the TI web

site.)

Table 5. Bill of Materials

Item No. Qty Ref Des Description Vendor Part Number

1 3 C1, C2, C11 Capacitor, ceramic, 10μF, 6.3V X5R 0603 Murata GRM188R60J106ME47D

2 1 C3 Capacitor, ceramic, 22μF, 6.3V 20% X5R Murata GRM21BR60J226ME39L

0805

3 3 C4, C5, C6 Capacitor, ceramic, 0.1μF, 16V 10% X7R Murata GRM188R71C104KA01D

0603

4 4 C7, C10, C12, C13 Not installed — —

5 1 C8 Capacitor, ceramic, 1.0μF, 16V 10% X5R Murata GRM188R61C105KA93D

0603

6 1 C9 Capacitor, ceramic, 2.2μF, 10V 20% X5R Murata GRM188R61A225ME34D

0603

7 2 J1A, J2A (Top Side) 10-pin, dual row, SM header (20 Pos.) Samtec TSM-110-01-T-DV-P

8 2 J1B, J2B (Bottom Side) 10-pin, dual row, SM header (20 Pos.) Samtec SSW-110-22-F-D-VS-K

9 1 J3A (Top Side) 5-pin, dual row, SM header (10 Pos.) Samtec TSM-105-01-T-DV-P

10 1 J3B (Bottom Side) 5-pin, dual row, SM header (10 Pos.) Samtec SSW-105-22-F-D-VS-K

11 2 JP1, JP2 Header strip, 2 pin (1x2) Samtec TSW-102-07-L-S

12 4 JP3, JP4, JP5, JP6 Header strip, 3 pin (1x3) Samtec TSW-103-07-L-S

13 3 R1, R2, R10 Resistor, 10kΩ1/10W 5% 0603 SMD Panasonic ERJ-3GEYJ103V

14 2 R3, R6 Resistor, 0Ω1/10W 5% 0603 SMD Panasonic ERJ-3GEY0R00V

15 1 R4 Resistor, 0.47Ω1/10W 5% 0603 Panasonic ERJ-3RQJR47V

16 1 R5 Resistor, 2.0kΩ1/10W 5% 0603 SMD Panasonic ERJ-3GEYJ202V

17 4 R7, R8, R9, R11 Resistor, 33Ω1/10W 5% 0603 SMD Panasonic ERJ-3GEYJ330V

18 4 R12, R13, R14, R15 Not installed — —

19 3 TP1, TP3, TP5 Test Point, Single .025 pin, red Keystone 5000

20 2 TP2, TP4 Test Point, Single .025 pin, black Keystone 5001

12-bit, dual-channel, high-precision DAC,

10-pin QFN DAC7562SDSC or

21 1 U1 Texas Instruments DAC8562SDSC(1)

16-bit, dual-channel, high-precision DAC,

10-pin QFN

22 1 U2 Precision voltage reference 2.5V, 8-SOIC Texas Instruments REF5025ID

23 1 U3 IC Op Amp GP R-R 90kHz, SOT23-5 Texas Instruments OPA379AIDBVT

24 1 U4 Not installed — —

25 7 N/A 0.100 Shunt, black Samtec SNT-100-BK-T

(1) The device installed at location U1 depends on the EVM purchased.

SBAU183A–May 2011–Revised June 2011 DAC7562EVM, DAC8562EVM

Schematics and Layout

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Figure 3. DAC8562EVM: Top Layer Image

Figure 4. DAC8562EVM: Bottom Layer Image

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