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EVAL-AD5755-1SDZ

Evaluation Board User Guide

Analog Devices 

Evaluation Board User Guide

UG-244

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The following power supplies are required.

Table 1. Power Supply Connections

Connector Nominal Comment

AVDD

15 V

Positive analog supply voltage.

10.8 V to 33 V range.

(Green LED D2 lights up when power

is supplied to AVDD.)

AVSS

−15 V/

Negative analog supply voltage.

+0 V

+10.8 V to −26.4 V range, or 0 V for

the AD5757 or AD5755-1 in unipolar

supply mode.

AVCC

5V

DC-to-dc supply voltage.

4.5 V to 5.5 V range.

The AVCC input supplies all four on-

board dc-to-dc blocks and may draw

as much as 0.8 A peak current per

channel, depending on the

configuration (see the device data

sheet for more information).

DVDD

3.3 V

Supplied from the SDP connector.

2.7 V to 5.5 V range.

REFIN

5V

See Table 3 for selecting the

reference source: the AD575x

internal reference, the on-board

ADR02 reference, or externally

provided via the REFIN input.

Both analog AGND and PGND inputs are provided on the

board. The PGND input is for the ground of the dc-to-dc

converter circuitry, and a ground connection for the AVCC

supply should be made at this point. The AGND and PGND

planes are connected at one location on the evaluation board.

The AGND and DGND planes are connected at one location

close to the AD5755, AD5755-1, or AD5757 device. Each

supply is decoupled to the relevant ground plane with

10 μF and 0.1 μF capacitors. Each device supply pin is also

decoupled with a 10 μF and 0.1 μF capacitor pair to the relevant

ground plane.

LINK OPTIONS

The link options on the evaluation board should be set for the

required operating setup before using the board. The functions

of the link options are described in Table 3.

Default Link Option Setup

The default link options are listed in Table 2.

Table 2. Default Link Options

Link AD5755

No.

Link Setup

AD5755-1

Link Setup

LK0 Removed

Removed

LK1 Removed

Removed

LK2 Inserted

Inserted

LK3 Inserted

Inserted

LK4 Inserted

Inserted

LK5 Inserted

Removed

LK6 Inserted

Inserted

LK7 Inserted

Removed

LK8 Inserted

Inserted

LK9 Inserted

Removed

LK10 Inserted

Inserted

LK11 Inserted

Removed

LK12 Removed

Removed

LK13 Removed

Removed

LK14 Removed

Removed

LK15 Removed

Removed

AD5757

Link Setup

Removed

Removed

Inserted

Inserted

Removed

Removed

Removed

Removed

Removed

Removed

Removed

Removed

Removed

Removed

Removed

Removed

Table 3. Link Options

Link No.

Device

LK0, LK1, LK2 All Models

LK3

LK4, LK6

LK10, LK8,

All Models

AD5755,

AD5755-1

LK5, LK7 LK9, AD5755

LK11,

LK12, LK13,

LK14, LK15

All Models

Description

These links select the voltage reference source (only one of these should be inserted at any one time).

LK0 selects the internal voltage reference of the AD575x as the voltage reference source.

LK1 selects an external voltage reference source that can be applied at Connector J7.

LK2 selects the on-board ADR02 as the voltage reference source. The ADR02 is supplied by the AVDD supply

and operates under the same input voltage range as the AVDD input of the AD575x, that is 9 V to 33 V.

Powers the on-board ADR02 5 V reference by connecting the AVDD supply to the ADR02 supply pin.

These links connect the +VSENSE input to VOUT for Channel A, Channel B, Channel C, and Channel D, respectively.

When this link is inserted, the +VSENSE input is connected directly to the VOUTx pin.

When this link is removed, the +VSENSE input is left floating and should be connected to the high-side of the

load resistance external to the evaluation board.

These links connect the +VSENSE input to VOUT for Channel A, Channel B, Channel C, and Channel D, respectively.

When this link is inserted, the +VSENSE input is connected directly to the VOUT pin.

When this link is removed, the +VSENSE input is left floating and should be connected to the high-side of the

load resistance external to the evaluation board.

These links allow connection of an external VBOOST supply. (Remove Resistors R43, R44, R17, and R20 to use this

feature.) When inserted, these connect the VBOOST pin of Channel A, Channel B, Channel C, and Channel D,

respectively, to the AVDD supply.

When removed, the VBOOST supplies are controlled by the dc-to-dc converter circuitry.

Rev. B | Page 3 of 16

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