Texas Instruments DAC7716EVM User manual

User's Guide

SBAU159–October 2009

DAC7716EVM

This user's guide describes the characteristics, operation, and use of the DAC7716EVM. The evaluation

module (EVM) is an evaluation board that allows for quick and easy evaluation of the DAC7716. The

DAC7716 is a quad, high-accuracy, 12-bit R-2-R digital-to-analog converter (DAC). The device features

low-power operation, good linearity, and the ability to use different reference voltages for the output

channels. This EVM allows evaluation of all aspects of the DAC7716. Complete circuit descriptions,

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

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

http://www.ti.com.

EVM-Compatible Device Data Sheets

Device Literature Number

DAC7716 SBAS463

REF5025 SBOS410

REF5050 SBOS410

OPA211 SBOS377

TL750L08 SLVS017

All trademarks are the property of their respective owners.

SBAU159–October 2009 DAC7716EVM

EVM Overview

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Contents

1 EVM Overview ............................................................................................................... 2

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

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

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

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

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

7 Schematics and Layout .................................................................................................... 8

List of Figures

1 Reference Test Points...................................................................................................... 6

2 DAC7716EVM Default Jumper Locations ............................................................................... 7

3 Default Settings for Switch S1 (LDAC Low) ............................................................................ 8

4 Default Settings for Switch S2 and S3 ................................................................................... 8

List of Tables

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

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

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

4 DAC7716EVM Bill of Materials ........................................................................................... 9

1 EVM Overview

1.1 Features

DAC7716EVM:

• Contains all support circuitry needed for the DAC7716

• Voltage reference options: Either 5V or 2.5V onboard, or external

• Jumpers on output pins for gain adjustment

• Compatible with the TI Modular EVM System

This manual covers the operation of the DAC7716EVM. Throughout this document, the abbreviation EVM

and the term evaluation module are synonymous with the DAC7716EVM.

1.2 Introduction

The DAC7716 uses a high-speed SPI interface (up to 50MHz) to communicate with a DSP or a

microprocessor using a compatible serial interface. The DAC features four individual outputs whose gain

is controlled by the addition of a feedback resistor. An additional VMON pin can relay any of the four output

channels from the DAC or the signal from the AIN pin.

The DAC7716EVM is designed to run in either bipolar (default mode) or unipolar modes of operation. This

flexible design allows for a wide range of supply voltages. The operating mode can be controlled using an

onboard switch or digitally, through the digital header.

The DAC7716EVM is an evaluation module built to the TI Modular EVM System specification. It can be

connected to any modular EVM system interface card. The EVM ships in the TQFP-48 pin package

option.

Note that the DAC7716EVM has no microprocessor and cannot run software. To connect it to a computer,

some type of interface is required.

The device shown in the front-page figure is the DAC8734, the 16-bit version of the DAC7716. The

DAC7716 is installed in place of the DAC8734 on the DAC7716 evaluation module.

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Analog Interface

2 Analog Interface

For maximum flexibility, the DAC7716EVM 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 DAC. 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

J1.1 SGND-0 Signal GND DAC output 0

J1.2 VOUT-0 Analog output 0

J1.3 SGND-1 Signal GND DAC output 1

J1.4 VOUT-1 Analog output 1

J1.5 SGND-2 Signal GND DAC output 2

J1.6 VOUT-2 Analog output 2

J1.7 SGND-3 Signal GND DAC output 3

J1.8 VOUT-3 Analog output 3

J1.9-13 (odd) AGND Analog ground connections

J1.10 AIN Auxiliary analog input

J1.14 VMON_BUF Monitor output after buffer

J1.15 Unused —

J1.17-19 (odd) AGND Analog ground connections

J1.18 RefGND Reference ground pins on the

DAC7716 (see below)

J1.20 EXTREF+ External reference source input (+

side of reference input)

J1.12 Unused —

J1.16 Unused —

The analog interface is populated on the top of the evaluation model. This configuration makes it possible

to stack multiple EVMs to run them in daisy-chain mode. J4 can be installed with a 90-degree connector to

allow access to the analog outputs if multiple EVMs are stacked. The J1B connector can be installed if the

part is used as a standalone board.

The DAC7716 can be configured with an output gain of 2 or 4. By default, the analog outputs of the

DAC7716EVM are configured with a gain of 4. If a gain of 2 is desired, the proper jumper must be

installed (JP2-JP5, depending on the output channel), and the command register must be set accordingly.

The SGND pins of the DAC7716 are connected to the ground of the evaluation board.

The Auxiliary Analog Input pin can be further protected from over-voltage and over-driving conditions. A

Schottky diode (D1) can be installed to protect the DAC7716 from an input over-voltage condition. An op

amp buffer is placed on the VMON output to limit the current that passes through the pin.

The DAC7716EVM has an external reference voltage option. If an external reference voltage is used,

switches S2 and S3 must be properly configured. Use the EXTREF+ (J1.20) to apply an external

reference voltage.

The DAC7716 is designed to have the REFGND-A and REFGND-B pins within 0.3V of the AGND.

Therefore, we recommend not using the RefGND pin when connecting an external reference. Connect the

ground source of the reference voltage to the ground of the board (J1.19). See the Reference Voltage

section for more information.

3 Digital Interface

The DAC7716EVM is a serial input data converter. The evaluation module is designed for interfacing to

multiple control platforms.

SBAU159–October 2009 DAC7716EVM

Digital Interface

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3.1 Serial Data 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 and serial 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: Serial Interface Pins(1)

Pin No. Signal Name I/O Type Pullup Function

J2.1 Unused — —

J2.2 GPIO-0 In/Out High GPIO-0

J2.3 J2.5 SCLK In None DAC7716 SPI

clock; pins are

shorted together

J2.4 DGND In/Out None Digital ground

J2.6 GPIO-1 In/Out High GPIO-1

J2.7 J2.9 CS In None SPI bus chip select;

pins are shorted

together

J2.8 Uni/Bip A In High Output mode select

of Group A

J2.10 DGND In/Out None Digital ground

J2.11 SDO/SDI In/Out None DAC7716 SPI data

in/out

J2.12 Uni/Bip B In High Output mode select

of Group B

J2.13 Unused — —

J2.14 RST In High Input register reset

J2.15 LDAC In High GPIO signal to

control LDAC for

DAC output latch

update

J2.16 Unused — —

J2.17 LDAC In High Alternate GPIO

signal to control

LDAC for DAC

output latch update

J2.18 DGND In/Out None Digital ground

J2.19 Unused — —

J2.20 Unused — —

(1) Group A contains VOUT-0 and VOUT-1. Group B contains VOUT-2 and VOUT-3.

The SCLK signal and the CS signal can each be controlled by two different pins on J2. Pins J2.3 and J2.5

have been shorted together, as well as pins J2.7 and J2.9.

Pins J2.8, J2.12, J2.14, J2.15, and J2.17 have weak pull-up/pulldown resistors. These resistors provide

default settings for many of the control pins. J2.3, J2.5, J2.7, J2.9, J2.11 correspond directly to DAC7716

pins. See the DAC7716 product data sheet for complete details on these pins.

Control signals to and from the DAC7716 can be accessed through the digital interface, or switches and

jumpers found directly on the EVM. The /LDAC, Uni/Bip A, Uni/Bip B, and RST signals are initially pulled

high through 10kΩresistors and can be controlled by switch S1 or through J2.

The load DAC (LDAC) pin is connected via jumper JP1 to either the J2.15 or J2.17 pin. Updating the DAC

registers can be completed in two different ways. LDAC can either be tied to ground, in which case the

input registers are immediately updated, or LDAC can be pulled high. Therefore, the DAC registers update

when LDAC is taken low. Switch S1.1 can be closed to hold the LDAC low. See the DAC7716 data sheet

for more information on updating the DAC.

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Power Supplies

4 Power Supplies

Samtec part numbers SSW-105-22-F-D-VS-K and TSM-105-01-T-DV-P provide a 5-pin, dual-row,

header/socket combination at J3. Table 3 lists the configuration details for J3. The voltage inputs to the

DAC can be applied directly to the device. The DAC7716 requires multiple power supplies to operate.

AVDD, AVSS, DVDD, and IOVDD are required to properly power the DAC.

Table 3. J3 Configuration: Power-Supply Input

Pin No. Pin Name Function Required

J3.1 +VA +4.75V to +24V analog supply Yes

J3.2 –VA –18V to –4.75V analog supply Yes

J3.3 +5VA +5V analog supply No

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 Optional

J3.8 +3.3VD 3.3V digital supply Optional

J3.9 VD1 Not used No

J3.10 +5VD +5V Yes

The Digital and Analog ground inputs are short-circuited internally through a ground plane.

The dc logic voltage for the DAC7716 (IOVDD) is selectable between +3.3VD, +1.8VD, or +5VD via the

JP8 jumper. These power-supply voltages are referenced to digital ground.

The DAC7716EVM is designed to work in either unipolar and bipolar mode. Each mode requires different

power-supply connections. Consult the DAC7716 data sheet for the restrictions on the power supplies for

the two operating modes.

5 Reference Voltage

The DAC7716EVM has the ability to use two different reference sources simultaneously for different

output channels. REFA and REFB control the reference voltages for the DAC. Output channels VOUT-0 and

VOUT-1 use REFA as a reference. REFB is used as a reference for output channels VOUT-2 and VOUT-3.

The evaluation module has three options for supplying reference voltages to the DAC7716. Switch S3

(REFA) and S2 (REFB) can select the reference voltage from the REF5050 (U5), REF5025 (U4) or use an

external reference. The REF5050 supplies 5.0V to the reference. The REF5025 supplies 2.5V to the

reference. These reference voltages are additionally filtered through an RC filter before connecting to the

DAC7716. The TL751L08 is used to voltage regulate +VA to properly power the REF5025 and REF5050.

When using an external reference, make sure that the ground terminal (from the external source) is

connected to the ground of the EVM board. There is a built-in diode in the DAC7716 that does not allow

the RefGND-A/RefGND-B to have more than a 0.3V difference from the board AGND on the DAC. A

jumper across pins 2 and 3 on JP6 and JP7 connects the RefGND-A and RefGND-B to the ground of the

board.

SBAU159–October 2009 DAC7716EVM

EVM Operation

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Note that if an external reference voltage is input to J1.20, it will be filtered through a first-order, low-pass

RC filter. To input your own reference signal without this filter, connect the reference signal directly to TP1

or TP2. Figure 1 shows the reference test points on the EVM.

Figure 1. Reference Test Points

6 EVM Operation

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

the DAC7716EVM.

6.1 Analog Output

The DAC7716 has four analog outputs that are available through the J1 header or the J4 header. The J4

header is designed to use 90-degree Samtec pins (not installed) when multiple EVMs are stacked to be

used in daisy-chain mode.

Jumpers J5-J8 control the gain of the individual output channels by connecting additional feedback

resistors to the internal op amp buffer. See the DAC7716 data sheet for more information on setting the

gain. Each analog output is able to swing ±16V in bipolar mode and 0 to 20V in unipolar mode.

The signal ground, SGND-N (for the output signals), are connected to header J1 and are short-circuited to

the board ground. All of the output signals are referenced to the ground of the board.

VMON is the channel monitor output. It can relay any of the four analog output signals or the AIN signal. The

VMON signal is buffered and current-limited through the OPA227 (U2). By default, the VMON pin is in 3-state

mode, causing the op amp to saturate. In order to avoid the op amp saturating to a rail, a 200kΩresistor is

put in place. The resistor serves as a load for the op amp when the VMON pin is in 3-state mode. However,

as a result, there is an error of ~1% on the VMON_BUF signal when relaying a signal.

6.2 Digital Control

The digital control signals can be applied directly to J1 (top or bottom side). The modular DAC7716EVM

can also be connected directly to a DSP or microcontroller interface board.

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 or send an e-mail to [email protected] for a listing of available code

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

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EVM Operation

6.3 Default Jumper Settings and Switch Positions

Figure 2 shows the jumpers found on the EVM and the respective factory default conditions for each.

Figure 2. DAC7716EVM Default Jumper Locations

Jumper JP1 controls whether the LDAC signal is controlled by J2.15 or J2.17. By default, the LDAC signal

is controlled by J2.17 but can be changed using JP1.

Jumpers JP2, JP3, JP4, and JP5 are used to control the gain of the individual DAC channels. By default,

the jumpers are removed, resulting in each DAC channel having a gain of 4. The gain of the output

channel is 2 when the corresponding jumper is in place.

JP6 and JP7 control the signals applied to REFGND-A and REFGND-B on the DAC7716. By default, a

jumper is placed across JP6.2 and JP6.3 as well as JP7.2 and JP7.3. This jumper connects REFGND-A

and REFGND-B to the ground of the board when an onboard reference is used. When an external

reference source is used, it is recommended that this jumper stay in place and configure the external

reference source to share a common ground with the EVM. See the Reference Voltage section for more

information.

Jumper JP8 is used to control the digital voltage for IOVDD. By default, a jumper is in place to short-circuit

pins JP8.1 and JP8.2 to use a 3.3V digital supply. If pins JP8.3 and JP8.4 are connected, a 1.8V digital

supply will be used. If pins JP8.5 and JP8.6 are connected, a 5V digital supply will be used for IOVDD.

Jumper JP9 is not installed. If the user desires to disconnect RFB1 from VOUT1, the trace between JP9

must be cut. JP9 can then be installed.

SBAU159–October 2009 DAC7716EVM

Schematics and Layout

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Switch S1 allows the user to pull down four control signals to ground. LDAC, Uni/Bip B, RST, and Uni/Bip

A can be pulled low using the switch. By default, switch position S1.1 is open, causing LDAC to be

connected to ground. Switches S1.2 and S1.4 are open to short-circuit Uni/Bip A and Uni/Bip B to ground.

This configuration sets the DAC7716 to bipolar mode (default). Figure 3 shows the default settings for

switch S1.

Figure 3. Default Settings for Switch S1 (LDAC Low)

Switch S2 controls the reference voltage selection for Ref B. When the switch is furthest left (position 1),

the onboard 5V reference is used from the REF5050. When the switch is in the middle position (position

2), the onboard 2.5V reference is used from the REF5025. If the switch is moved to the right (position 3),

Ref B is set up to use an external reference. Pins J1.18 (Ref–) and J1.20 (Ref+) are used to apply an

external reference voltage.

Switch S3 controls the reference voltage selection for Ref A. The switch has the same functionality as

switch S2. By default, switch S2 and switch S3 are set to use the 5V onboard reference, as Figure 4

shows.

Figure 4. Default Settings for Switch S2 and S3

7 Schematics and Layout

Schematics for the DAC7716EVM are appended to this user's guide. The bill of materials is provided in

Table 4.

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 TI web site.)

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Schematics and Layout

space

Table 4. DAC7716EVM Bill of Materials(1)

Item No. Qty Ref Des Description Manufacturer Mfr Part Number

1 1 N/A Printed wiring board Texas Instruments 6508538

2 6 C1, C6, C10, Capacitor, ceramic 1.0µF 16V X5R TDK C1608X5R1C105K

C11, C14, C15 10% 0603

3 7 C2, C3, C4, Capacitor, ceramic 10µF 25V X5R MuRata GRM31CR61E106KA12L

C5, C7, C8, 1206 10%

4 4 C12, C13, Capacitor, ceramic 10µF 10V 0603 Panasonic ECJ-1VB1A106M

C16, C 17 X5R 20%

5 0 D1 Not installed N/A N/A

6 3 JP1, JP6, JP7 Header strip, 3-pin (1x3) Samtec TSW-103-07-L-S

7 5 JP2, JP3, JP4, Header strip, 2-pin (1x2) Samtec TSW-102-07-L-S

JP5, JP9

8 1 JP8 Header strip, 6-pin (2x3) Samtec TSW-103-07-L-D

9 2 J1A, J2A 10-Pin, Dual Row, SM Header (20 Samtec TSM-110-01-T-DV-P

(Top Side) Pos.)

10 0 J1B Not installed N/A N/A

(Bottom Side)

11 1 J2B 10-Pin, Dual Row, SM Header (20 Samtec SSW-110-22-F-D-VS-K

(Bottom Side) Pos.)

12 1 J3A 5-Pin, Dual Row, SM Header (10 Pos.) Samtec TSM-105-01-T-DV-P

(Top Side)

13 1 J3B(2) 5-Pin, Dual Row, SM Header (10 Pos.) Samtec SSW-105-22-F-D-VS-K

(Bottom Side)

14 0 J4 Not installed N/A N/A

15 5 R1, R2, R3, Resistor 33 Ω1/10W 5% 0603 SMD Panasonic ERJ-3GEYJ330V

R4, R5

16 6 R6, R7, R8, Resistor 10 kΩ1/10W 5% 0603 SMD Yageo RC0603JR-0710KL

R9, R10, R11

17 2 R12, R13 Resistor 1.0 kΩ1/10W 5% 0603 SMD Panasonic ERJ-3GEYJ102V

18 2 R14, R15 Resistor 1.0 Ω1/10W 5% 0603 Panasonic ERJ-3GEYJ1R0V

19 1 R16 Resistor 200 kΩ1/10W 1% 0603 SMD Panasonic ERJ-3EKF2003V

20 1 S1 Switch Dip Tape 4 pos C&K TDA04H0SB1R

21 2 S2, S3 SW SLIDE ULTRA MINI SP3T TOP NKK SS14MDP2

ACT

22 3 TP1, TP2 ,TP3 Test Point - Single .025 Pin, Red Keystone 5000

23 2 TP4, TP5 Test Point - Single .025 Pin, Black Keystone 5001

24 1 U1 Quad, 12-bit, High Accuracy DAC, Texas Instruments DAC7716SPFB

TQFP Package

25 1 U2 OPA227, Differential Operational Texas Instruments OPA227UA

Amplifier

26 1 U3 Single output, 8V voltage regulator Texas Instruments TL750L08CD

27 1 U4 Precision Voltage reference 2.5V Texas Instruments REF5025AID

28 1 U5 Precision Voltage reference 5.0V Texas Instruments REF5050AID

29 8 N/A 0.100 Shunt - Black Samtec SNT-100-BK-T

(1) Manufacturer and part number for items may be substituted with electrically equivalent items.

(2) J3B parts are not shown in the schematic diagram. J3B is installed on the bottom side of the PWB opposite to J3A.

SBAU159–October 2009 DAC7716EVM

1 2 3 4 5 6

654321

5411 EAST WILLIAMS BOULEVARD, TUCSON, AZ 85711 USA

TITLE

SHEET OF FILE

SIZE DATE REV

DRAWN BY

ENGINEER

REVISION HISTORY

REV ENGINEERING CHANGE NUMBER A ROVED

PRECISION ANALOG PRODUCTS

HIGH- ERFORMANCE ANALOG DIVISION

SEMICONDUCTOR GROU

DOCUMENT CONTROL NO.

Vmon 34

Vout-0 15

RFB1-0 17

RFB2-0 16

SGND-0 18

Vout-1 23

RFB1-1 21

RFB2-1 22

SGND-1 20

RFB1-2 44

Vout-2 46

RFB2-2 45

SGND-2 43

Vout-3 38

RFB1-3 40

RFB2-3 39

SGND-3 41

REFGND-A 29

REF-A 30

DVDD 14

AVSS 33

AVSS 28

AVDD 35

AVDD 26

IOVDD 13

SCLK

SDI

SDO

LDAC

Ain

Uni/Bip A

Uni/Bip B

RST

DGND

AGND

G IO-1

9G IO-0

REF-B

REFGND-B

DAC7716

-VA 2

-5VA 4

AGND 6

VD1 8

+5VD 10

+VA

+5VA

DGND

+1.8VD

+3.3VD

DAUGHTER-POWER

VIN

2VOUT 6

TRIM 5

GND

4TEM

REF5050

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

+VA

+VA -VA

IOVDD

10k

R10

10k

R11

10k

VIN

2VOUT 6

TRIM 5

GND

4TEM

REF5025

7 8

9 10

11 12

13 14

15 16

17 18

19 20

J2B

Seri l He der Bottom

+5VD

1 8

2 7

3 6

4 5

DIPSWITCH-4

-VA

+VA

-VA

JP6 nd JP7 control the RefGND

7 8

9 10

11 12

13 14

15 16

17 18

19 20

J2A

Seri l He der Top

SCLK

SDI

SDO

LDAC

Uni/Bip A

Uni/Bip B

GPIO-0

GPIO-1

SCLK

LDAC

SDO

GPIO-0

GPIO-1

Uni/Bip A

Uni/Bip B

RST

GPIO-0

GPIO-1

Uni/Bip A

Uni/Bip B

RST

SDI

SCLK

R1 33

R2 33

R3 33

R4 33

Vout-0

Vout-1

Vout-2

Vout-3

Ain

Vmon_buf

ExtREF-

ExtREF+

T. C l bri

DAC8734EVM

+5VA

10k

Output 1

Com 2

Com 3

Com 6

Com

Input

TL750L08

OPA227

An log to only be popul ted t top of bo rd

R12

R13

ExtREF+

R5 33

NKK_SS14MDP2

1K1 3

D1A

3K2 2

D1B

6508538

10uF

1uF

C10

1uF

C11

1uF

C15

1uF C13

10uF

C12

10uF

C14

1uF

C16

10uF

C17

10uF

JP2

JP3

JP4

JP5

JP1

3POS_JUMPER

JP7

3POS_JUMPER

JP6

3POS_JUMPER

1 2

3 4

5 6

JP8

JPR-2X3

TP1

TP2

A0(+) 2

A1(+) 4

A2(+) 6

A3(+) 8

A4 10

A5 12

A6 14

A7 16

REF- 18

REF+ 20

A0(-)

A1(-)

A2(-)

A3(-)

AGND

VCOM

AGND

J1A

DAUGHTER-ANALOG

HEADER-8

R15

R14

TP4

TP3

TP5

R16

200k

7 8

9 10

11 12

13 14

15 16

17 18

19 20

J1B

DAUGHTER ANALOG BOTTOM

JP9

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