EVAL-AD5532EBZ Datasheet EVAL-AD5532EBZ | P1-P3

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REV. 0 04/00

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Evaluation Board for 32 Channel,

Infinite Sample-and-Hold

EVAL-AD5532EB

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Full-Featured Evaluation Board for the AD5532/AD5533

On-Board 3V Reference

Various Link and Switch Options

PC Software for Control af AD5532/AD5533

Socketed AD5532/AD5533 for Easy Replacement

INTRODUCTION

This Technical Note describes the evaluation board for the

AD5532 and AD5533. These devices combine a 32 channel

voltage translation function with an infinite output hold

capability. An analog input voltage on the common input pin,

Vin, is sampled and its digital representation transferred to a

chosen DAC register. The output of this DAC is then

updated to reflect the new contents of the DAC register.

Channel selection is accomplished via the parallel address

inputs A0-A5 or via the serial input port. The AD5532 is

operated with AVcc= +5V+/-5%, DVcc= 2.5V to 5.25V,

Vss= -4.75V to -16.5V, Vdd= 10V to 16V and requires a

stable +3V reference on the REF_IN pin as well as an offset

voltage on OFFS_IN. These devices are available in a 74-

lead LFBGA package. Full datails are available in the

AD5532 and AD5533 datasheets from Analog Devices and

should be consulted in conjunction with this Technical Note

when using the Evaluation Board.

On-board components include an AD780 which is a pin

programmable +3V ultra high precision bandgap reference

and an AD5541 which is a 16-bit DAC that can be used to

provide an analog input voltage to the AD5532/AD5533.

There are various link and switch options which are ex-

plained in detail on page 2.

Interfacing to this board from a PC is through a 36-way

Centronics connector. This 36-way connector is compatible

with most printer cables and is usually connected to the

parallel printer port on a standard PC via a standard printer

cable.

OPERATING THE AD5532 EVALUATION BOARD

Power Supplies

The following external supplies must be provided: +5V

between the DVCC and DGND inputs which supplies the

DVCC pins on the AD5532. +5V between the AVCC and the

AGND inputs to supply the AD780, the AD5541, the AD820

and the AVCC pins on the AD5532. -15V to the VSS input

to supply the AD5532 AVSS pins. +15V to the VDD input

to supply the AD5532 AVDD pins.

Each supply is decoupled to the relevant ground plane with

a 47uF and a 0.1uF capacitor pair as it enters the board. Each

device supply pin is again decoupled with a 10uF and a 0.1uF

capacitor pair to the relevant ground plane.

There are 2 ground planes on the board, AGND and DGND.

These are connected together at one location close to the

AD5532. It is recommended not to connect these anywhere

else to avoid ground loop problems.

AD5532/33

32-Channel

DAC/SHA

Parallel Interface

14 pin Header

DAC

Reference

External

Ain

V31

Power Supply Inputs

Ain

V31

Seri al Inte rfa ce

36 pin C onnector

EVAL-AD5532EB

–2–

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LINK AND SWITCH OPTIONS

There are 2 link options and 3 switches which must be set for the required operating setup before using the evaluation board.

The functions of these link options and switches are outlined below.

Table I. Link and Switch Functions.

Link No. Function.

LK1 This link option allows the user to select whether the AD5532 serial or parallel interface will be used.

When this link is in position "A" the SER/PAR pin is tied high thus selecting the serial interface.

When this link is in position "B" the SER/PAR pin is tied low thus selecting the parallel interface.

LK2 This link option is unused.

Switch No. Function.

S1 This switch selects the source of the reference voltage for the AD5532 REFIN pin. It has 2 settings each

clearly labelled on the board, namely REFOUTand AD780.

When the slider is moved to the REFOUT position, the AD5532 REFOUT pin provides the 3V reference.

When the slider is moved to the AD780 position, the AD780 reference provides the 3V reference.

S2 This switch selects the source of the offset voltage that must be applied to the AD5532 OFFS_IN pin. It has

2 settings each clearly labelled on the board, namely OFFS_OUT and SK1.

When the slider is moved to the OFFS_OUT position, the AD5532 OFFS_OUT pin provides the offset

voltage.

When the slider is moved to the SK1 position, the offset voltage must be provided via the exteral SMB socket,

SK1

S3 This switch selects the source of the analog input voltage that must be applied to the AD5532 VIN pin. It

has 2 settings each clearly labelled on the board, namely DAC and SK3.

When the slider is moved to the DAC position, the AD5541 sets up the analog input voltage under the control

of the evaluation software provided in the evaluation kit.

When the slider is moved to the SK3 position, the analog input voltage must be provided via the exteral SMB

socket, SK3

SET-UP CONDITIONS

Care should be taken before applying power and signals to the evaluation board to ensure that all link/switch positions are

set as per the required operating mode. Table II shows the position in which all the links are set when the evaluation board

is sent out.

Table II. Initial Link and Switch Positions

Link No. Position Function.

LK1 A Serial interface selected.

LK2 - Not used.

S1 AD780 AD780 provides 3V reference.

S2 OFFS_OUT The AD5532 OFFS_OUT pin provides the offset voltage which is connected to

the AD5532 OFFS_IN pin.

S3 DAC The analog input voltage is provided by the AD5541 DAC under the control of the

evaluation software.

EVAL-AD5532EB

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–3–

EVALUATION BOARD INTERFACING

Serial interfacing

The 36-pin centronics connector interfaces to the serial interface on the AD5532 and also interfaces to the serial interface on

the AD5541. The evaluation software provided with the evaluation kit will only work when the user is using the serial interface.

The pin-out description and function of the 36-pin serial interface connector, J2, is given in Table III.

Table III. 36-pin Serial Interface connector.

Pin No. Name Description.

2 DIN Connects to both the AD5532 and AD5541 DIN pins. Serial data is loaded to either

of these devices via this pin.

3 SCLK Connects to the serial clock pins on the AD5532 and the AD5541.

4 SYNC(SHA) Connects to the SYNC pin on the AD5532.

5 CS(DAC) Connects to the CS pin on the AD5541.

6 TRACK Connects to the TRACK/RESET pin on the AD5532.

10 DOUT Connects to the DOUT pin on the AD5532.

13 BUSY Connects to the BUSY pin on the AD5532.

19-30 GND Connects to the DGND plane on the board.

For further information on the functions and timing of these signals refer to the AD5532 and AD5533 Data Sheets.

Parallel interfacing

The parallel interface connections are made available for user expansion at the 14-pin parallel interface header, J1. The pin-

out description and function of this header is given in Table IV.

Table IV. 14-pin Parallel Interface connector.

Pin No. Name Description.

1 TRACK Connects to the TRACK/RESET pin on the AD5532.

2 OFFS_SEL Connects to the OFFS_SEL pin on the AD5532.

3 CAL Connects to the CAL pin on the AD5532.

4 A5 Connects to the A5 pin on the AD5532.

5 A4 Connects to the A4 pin on the AD5532.

6 A3 Connects to the A3 pin on the AD5532.

7 - unused

8 A2 Connects to the A2 pin on the AD5532.

9 A1 Connects to the A1 pin on the AD5532.

10 A0 Connects to the A0 pin on the AD5532.

11 WR Connects to the WR pin on the AD5532.

12 CS Connects to the CS pin on the AD5532.

13 BUSY Connects to the BUSY pin on the AD5532.

14 GND Connects to the DGND plane on the board.

For further information on the function and timing of these signals refer to the AD5532 Data Sheet.

P1-P3 P4-P6 P7-P7

EVAL-AD5532EBZ

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Description:

Data Conversion IC Development Tools EVAL BRD AD5532

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