Analog Devices DC2904A-B Manual de usuario

User Guide | DC2904A

UG-2018

Evaluating the LTC2686 8-Channel, 16-Bit Voltage Output SoftSpan DAC

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | 1 of 11

FEATURES

►Fully featured evaluation board for the LTC2686 multichannel

voltage output DAC

►Flexible output power supply configuration

►Easy connection to external loads

►Test points to monitor DAC status signals

►ACE evaluation software compatible

EVALUATION KIT CONTENTS

►DC2904A-B evaluation board

►Ribbon cable to connect to the Linduino DC2026C controller

board

EQUIPMENT NEEDED

►DC2026C controller board (must be purchased separately)

►PC running Windows® 7 or Windows 10

►Voltmeter

►Power supply

SOFTWARE NEEDED

►ACE evaluation software (available for download from the

DC2904A product page)

DOCUMENTS NEEDED

►LTC2686 data sheet

►DC2904A-B design files (see the DC2904A product page)

GENERAL DESCRIPTION

The DC2904A-B is a fully featured evaluation board that is used

to evaluate the LTC2686, an 8-channel, precision voltage output

digital-to-analog converter (DAC).

The DC2904A-B is controlled through a serial peripheral interface

(SPI) from the J1 connector. The SPI signals are sent from the

DC2026C controller board through the ribbon cable that is connect-

ed to the DC2904A-B.

The DC2904A-B uses Analysis, Control, Evaluation (ACE) software

to provide an intuitive graphical user interface (GUI) that configures

and controls the LTC2686 using the SPI interface.

The LTC2686 is used for various voltage mode biasing applications

such as optical modulators for data communications. The output

voltage range for each channel is software selectable, and any

channel can be routed to the DC2904A-B MUX pin, allowing either

the channel voltage or current to be externally monitored.

For full specifications on the LTC2686, see the LTC2686 data

sheet, which must be consulted in conjunction with this user guide

when using the DC2904A-B.

EVALUATION BOARD PHOTOGRAPH

Figure 1. DC2904A-B Evaluation Board

User Guide DC2904A

TABLE OF CONTENTS

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Features................................................................ 1

Evaluation Kit Contents......................................... 1

Equipment Needed................................................1

Software Needed...................................................1

Documents Needed...............................................1

General Description...............................................1

Evaluation Board Photograph................................1

Evaluation Board Hardware...................................3

Evaluation Board Overview................................3

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

Analog Outputs...................................................4

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

Reference...........................................................4

Multiplexer Output.............................................. 4

On-Board Connectors........................................ 4

Getting Started...................................................... 5

Software Installation Procedures........................5

Evaluation Hardware Setup................................5

Software Operation............................................ 5

Main Window......................................................6

Troubleshooting...................................................10

Hardware..........................................................10

Ordering Information............................................11

REVISION HISTORY

10/2021—Revision 0: Initial Version

User Guide DC2904A

EVALUATION BOARD HARDWARE

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EVALUATION BOARD OVERVIEW

The DC2904A-B requires the power connections and connection

to the DC2026C controller board shown in Figure 2. The ribbon

cable provided in the evaluation kit connects the DC2904A-B and

the DC2026C via the J1 connector. Turrets are provided to connect

the DC2904A-B to the power supplies.

The DC2904A-B has other optional features to allow the user to

select an external reference, provide separate supply voltages for

Channel 0 to Channel 3 and Channel 4 to Channel 7, and to

monitor various outputs through the on-board MUX pin. These

optional features do not need to be changed for normal operation.

POWER SUPPLIES

The DC2904A-B is powered using external supplies. The minimum

requirement to power the DC2904A-B is to provide 5.0 V to 21 V on

E2 (V1+) and connect E3 (GND) and E4 (V−) to ground (GND).

As an alternative, the supply connection to E4 (V−) can be in

the range between −21 V and ground (GND) to accommodate

applications that require a negative supply.

The default position for JP5 (V1+ = V2+) is in the CONNECT

position. This position connects the V1+ and V2+ power supplies so

that they are at the same voltage. By changing JP5 to the NC (not

connected) position, V1+ and V2+ are decoupled on the evaluation

board and can be driven with separate supplies. V1+ and V2+ have

the same requirement. They must be in the range of 5 V to 21 V but

do not need to be the same voltage when decoupled. However, V2+

must be less than or equal to V1+.

E10 (VCC) and E5 (IOVCC) are supplied from on-board regulators

by default. If desired, these voltages can be driven with an external

supply.

Figure 2. DC2904A-B Hardware Connections

User Guide DC2904A

EVALUATION BOARD HARDWARE

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ANALOG OUTPUTS

The analog outputs, VOUT0 to VOUT7, are available on the E13, E14,

E15, E16, E17, E18, E19, and E20 turrets, respectively. Return

paths for the ground currents are available on the E3 and E23

(GND) turrets. These turrets must be connected to load GND.

DIGITAL INTERFACE

DC2026C Connections

The DC2904A-B uses the DC2026C to communicate with the ACE

evaluation software through the USB port on the DC2026C. Use

the provided ribbon cable to connect J1 of the DC2904A-B to J1

of the DC2026C. When this connection is made, the DC2026C

powers the electrically erasable programmable read only memory

(EEPROM) on the DC2904A-B. The ACE evaluation software uses

the EEPROM to identify the DC2904A-B and load the proper plugin.

To ensure proper serial transfers and compatibility, the DC2026C

powers the IOVCC pin of the LTC2686, which is nominally 5 V.

DC2026C Connector Pin Descriptions

Figure 3 shows the pins for the DC2026C J1 connector. For de-

scriptions of each pin, see Table 1.

Figure 3. DC2026C J1 Connector Pins

Table 1. DC2026C Connector J1 Pin Descriptions

Pin No. Mnemonic Description

1 V+ Unregulated voltage from the DC2026C,

nominally 7 V

2 VCCIO I/O voltage set by JP3 on the DC2026C

3 GND Ground

4 SCL/SCK Serial clock from the DC2026C

5 MISO Serial data from the DC2904A-B

6 CS Chip select from the DC2026C

7 SDA/MOSI Serial data from the DC2026C

8 GND Ground

9 EEDA Serial data for EEPROM

10 EEVCC Power supply (VCC) for EEPROM

11 EESCL Serial clock for EEPROM

12 EEGND Ground for EEPROM

13 GND Ground

14 NC No connection

REFERENCE

By default, the DC2904A-B uses the internal reference of the

LTC2686. To use an external reference, place the DC2904A-B JP1

(REF SEL) jumper into the EXT position and apply an external

reference to E11 (REF).

MULTIPLEXER OUTPUT

The LTC2686 has an internal multiplexer that allows monitoring of

compliance voltages, output currents, and internal die temperature.

The output compliance voltages and representative voltages of

the output current and internal die temperature are available on

the LTC2686 MUX pin and can be routed to the DC2904A-B E21

connector (MUX) using the LTC2686-16 Memory Map view in the

ACE GUI (see Figure 8), and setting the appropriate bits in the

analog mux control register. Refer to the LTC2686 data sheet for

more details on the multiplexer functionality and register structure.

ON-BOARD CONNECTORS

Table 2 describes the on-board connectors on the DC2904A-B.

Table 2. On-Board Connectors

Connector Function

J1 SPI/I2C interface pin header connector

JP1 Internal or external reference select

JP2 Toggle Pin 0 (TGP0)

JP3 Toggle Pin 1 (TGP1)

JP4 Toggle Pin 2 (TGP2)

JP5 Connect or disconnect V1+ and V2+

E1 V2+

E2 V1+

E3, E6, E7, E12, E23 GND

E4 V−

E5 IOVCC

E8 CLR

E9 LDAC

E10 VCC

E11 REF

E13 Channel 0 voltage output (VOUT0)

E14 Channel 1 voltage output (VOUT1)

E15 Channel 2 voltage output (VOUT2)

E16 Channel 3 voltage output (VOUT3)

E17 Channel 4 voltage output (VOUT4)

E18 Channel 5 voltage output (VOUT5)

E19 Channel 6 voltage output (VOUT6)

E20 Channel 7 voltage output (VOUT7)

E21 MUX

E22 FAULT

User Guide DC2904A

GETTING STARTED

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The ACE evaluation software controls and configures the on-board

LTC2686 through the DC2026C.

SOFTWARE INSTALLATION PROCEDURES

Before connecting the DC2026C to the DC2904A-B, follow these

steps to set up the DC2904A-B for initial use in the ACE evaluation

software:

1. Download the ACE evaluation software package from the

DC2904A-B product page at www.analog.com/DC2904A to

start the ACE evaluation software installation.

2. Open the ACEInstall_1.21.xxxx.xxxx.exe file and follow the

instructions in the folder to complete the software installation

process.

EVALUATION HARDWARE SETUP

When the ACE evaluation software installation is complete, follow

these steps to set up the DC2026C and the DC2904A-B together:

1. Connect the DC2026C to the DC2904A-B via the J1 connectors

with the ribbon cable provided (see Figure 2).

2. Connect the desired power supplies to E2 (V1+), E3 (GND),

and E4 (V−) on the DC2904A-B.

3. Connect the desired load to the appropriate channel on the

DC2904A-B.

4. Connect the load ground to a ground (GND) turrets (either E3

or E23) on the DC2904A-B.

5. Connect the DC2026C to a PC or laptop using the USB cable.

6. Start the ACE evaluation software (see the Software Operation

section).

SOFTWARE OPERATION

To start the ACE evaluation software, from the Start menu, click

Analog Devices > ACE. The software window opens (see Figure

4) until the software recognizes the DC2904A-B. When the software

recognizes the DC2904A-B, the main software window in Figure 5

opens.

Figure 4. Interface Window

User Guide DC2904A

GETTING STARTED

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Figure 5. ACE Evaluation Software Main Window

MAIN WINDOW

In the main ACE evaluation software window (see Figure 5), each

channel can be controlled. Various settings for the LTC2686 are

available in this window, allowing the user to configure the output

range, output voltage, gain adjustment, offset adjustment, toggle

options, and dither options of each channel.

Refer to the LTC2686 data sheet for more information on the

device features associated with the different tab functions that are

described in the following sections.

Reference Configuration

The DC2904A-B uses the LTC2686 internal reference to set the

full-scale range. To apply an external reference, click the box

labeled Reference Select (see Figure 5).

Setting the Channel Output Range

To set the output range for a specific channel on the LTC2686,

1. Select the channel from the Channel Select dropdown box.

2. Select the desired range for the selected channel using the

Span selection dropdown box (see Figure 5).

Setting the Channel Voltage Value

To set the output voltage for a specific channel on the LTC2686,

1. Select the channel from the Channel Select dropdown box.

2. Type the desired value into the Register A text box (see

Figure 5).

Toggling Between A and B Output Registers

Each channel has two output registers that can be written inde-

pendently.

1. Click the Register A or Register B option to select the register

to write to.

2. Type the desired hexadecimal value into the Register A (or

Settling Offset and Gain Values

Each channel can have an offset and gain value applied to the

output. The value is applied to each channel independently.

1. Select the channel from the Channel Select dropdown box.

2. Type the desired hexadecimal offset or gain adjust value into

the Offset Adjust or Gain Adjust text boxes (see Figure 5).

Enabling Toggle Mode

Toggle mode can be enabled by selecting the Enable Toggle/Dith-

er Functionality check box (see Figure 5). This check box enables

the toggle view shown in Figure 6. The toggle signal can then be

applied to the selected pin or supplied internally.

User Guide DC2904A

GETTING STARTED

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Enabling Dither Mode

After enabling the toggle view shown in Figure 6 as described in

the Enabling Toggle Mode section, select the dither mode from the

Mode dropdown box to bring up the dither options (see Figure 7).

The default values for the dither phase (ⱷ0) and period (N) are 0°

and N = 4. The phase and period of the dither can be modified

using the dropdown boxes to select from a fixed list of options.

Figure 6. Toggle View

User Guide DC2904A

GETTING STARTED

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Figure 7. Dither View

User Guide DC2904A

GETTING STARTED

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Memory Map View

To access the LTC2686-16 Memory Map view, click the Proceed

to Memory Map button from the software main window

(see Figure 5).

Figure 8. LTC2686-16 Memory Map View

User Guide DC2904A

TROUBLESHOOTING

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HARDWARE

A comprehensive list of frequently asked questions (FAQ) is availa-

ble on the LTC2686 FAQs page in the EngineerZone™ site. For

other questions, submit them to the Precision DACs section of the

EngineerZone site.

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