EVAL-ADM1087EBZ【PDF 1/8 页】BOARD EVALUATION FOR ADM1087

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ADM1087 Simple Sequencer?

Evaluation Kit

EVAL-ADM1087EB

FEATURES

Sequencing of 3.3 V, 2.5 V, and 1.8 V power supplies

Red, yellow, and green LEDs indicate power supply status,

giving visual demonstration of power-up sequence

Dedicated power and enable/disable switches

On-board test points allow examination of ADM1087 and

regulator I/O signals

Sockets allow external through-hole capacitors to be

connected manually for customizable time delays

GENERAL DESCRIPTION

The EVAL-ADM1087EB Evaluation Kit demonstrates how the

ADM1087 Simple Sequencer? can be used to provide time-

based sequencing in multiple-supply systems. A pair of

ADM1087s are cascaded with three ADP3334 LDO regulators,

which supply voltage levels of 3.3 V, 2.5 V, and 1.8 V. In this

configuration, the 3.3 V supply switches on as soon as power

from a 9 V battery is applied, and the 2.5 V and 1.8 V regulators

are enabled by delayed detection signals from the outputs of the

previous regulators in the circuit.

EVALUATION KIT CONTENTS

ADM1087 evaluation board

9 V battery

2 100 nF ceramic capacitors

4 samples (1 presoldered to on-board adapter)

Red, yellow, and green LEDs provide a visual indication of the

status of each of the three supplies, and two pairs of wire wrap

pins allow for experimentation with different capacitor values

for different enable time delays. A dedicated enable/disable

switch connects directly to the ENIN ADM1087 inputs to

demonstrate how a supply can be switched off by driving this

pin low with an external logic signal.

EVALUATION BOARD BLOCK DIAGRAM

ON/OFF

RED

YELLOW

GREEN

ADP3334

OUT

3.3V

ADP3334

OUT

2.5V

ADP3334

OUT

1.8V

3.3V

V CC

3.3V

V CC

V IN

ADM1087

ENOUT

V IN

ADM1087

ENOUT

ENIN CEXT

ENABLE/

DISABLE

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

Figure 1.

ENIN CEXT

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700 www.analog.com

registered trademarks are the property of their respective owners.

Fax: 781.326.8703

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