ADM1087 Simple Sequencer™
Evaluation Kit
EVAL-ADM1087EB
FEATURES
GENERAL DESCRIPTION
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
The EVAL-ADM1087EB Evaluation Kit demonstrates how the
ADM1087 Simple Sequencer™ can be used to provide timebased 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
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.
ADM1087 evaluation board
9 V battery
2 100 nF ceramic capacitors
4 samples (1 presoldered to on-board adapter)
EVALUATION BOARD BLOCK DIAGRAM
ON/OFF
IN
SD
9V
ADP3334
IN
RED
OUT
SD
3.3V
GREEN
OUT
ADP3334
1.8V
3.3V
VCC
ADM1087
SD
2.5V
3.3V
VIN
IN
YELLOW
OUT
ADP3334
VCC
VIN
ENOUT
ADM1087
ENOUT
ENIN CEXT
ENIN CEXT
05074-001
9V
ENABLE/
DISABLE
Figure 1.
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
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
EVAL-ADM1087EB
TABLE OF CONTENTS
Power-Up/Power-Down Waveforms.............................................. 3
Ordering Information.......................................................................6
EVAL-ADM1087EB Schematic ...................................................... 4
EVAL-ADM1087EB Bill of Materials.........................................6
Evaluation Board Layout Graphics ................................................ 5
Ordering Guide .............................................................................7
REVISION HISTORY
9/04—Revision 0: Initial Version
Rev. 0 | Page 2 of 8
EVAL-ADM1087EB
POWER-UP/POWER-DOWN WAVEFORMS
The relationship between the size of the external capacitance
and the duration of the enable time delay is given by the
following formula:
1
2
3
4
05074-003
Figure 2 shows the LDO output sequence when battery power is
applied and removed. Channel 1 is the 9 V power signal, which
is switched on and off via the S1 switch. Channels 2, 3, and 4 are
the 3.3 V, 2.5 V, and 1.8 V ADP3334 LDO outputs, respectively.
When the 9 V supply is switched on, the 3.3 V, 2.5 V, and 1.8 V
supplies power up in sequence, with 4.7 nF external capacitors
used to give delays of 22.5 ms between the enabling of the
respective LDOs.
CH1 5.00V
CH3 5.00V
tEN = (C × 4.8 × 106) + 35 µs
CH2 5.00V
CH4 5.00V
M25.0ms
Figure 2. Sequenced Waveforms
Rev. Pr0 | Page 3 of 8
CH1
5.7V
Figure 3.
Rev. 0 | Page 4 of 8
9V
05074-002
C1
1µF
9V
S1
7
8
S2
ADP3334
IN
U1
1
OUT
2
IN
OUT
3
6
SD
FB
4
5
GND NC
P1
C9
1µF
R13
51kΩ
R12
160kΩ
R1
75kΩ
R2
150kΩ
T5
T1
1
2
3
C2
1µF
U4
B
E
C
VCC
ENIN
CEXT
GND ENOUT
VIN
ADM1087
R16
10kΩ
D1
HERED
5
4
6
Q1
R3
3.9kΩ
100nF
C7
T4
C3
1µF
IN
ADP3334
U2
1
OUT
2
7
IN
OUT
3
6
SD
FB
4
5
GND NC
8
R4
10kΩ
R15
51kΩ
R14
110kΩ
R5
91kΩ
R6
10kΩ
2.5V
1
2
3
E
C
VCC
ENIN
CEXT
5
4
6
Q2
GND ENOUT
VIN
ADM1087
U5
B
D2
YELLOW
R17
10kΩ
C4
1µF
T6
T2
R7
3.9kΩ
100nF
C8
T7
C5
1µF
IN
1
2
3
1
2
3
U6
VCC
U8
VCC
CEXT
ENIN
CEXT
GND ENOUT
VIN
ENIN
5
4
6
5
4
6
R9
150kΩ
R10
75kΩ
GND ENOUT
VIN
ADP3334
U3
1
OUT
2
7
IN
OUT
3
6
SD
FB
4
5
GND NC
8
R8
10kΩ
1.8V
T3
1
2
3
1
2
3
C6
1µF
B
U7
Q3
VCC
E
C
U9
VCC
CEXT
ENIN
CEXT
GND ENOUT
VIN
ENIN
GND ENOUT
VIN
R18
10kΩ
D3
GREEN
5
4
6
5
4
6
R11
3.9kΩ
EVAL-ADM1087EB
EVAL-ADM1087EB SCHEMATIC
EVAL-ADM1087EB
05074-004
05074-006
EVALUATION BOARD LAYOUT GRAPHICS
Figure 6. Solder-Side Silkscreen
05074-005
Figure 4. Evaluation Board Layout
Figure 5. Component-Side Silkscreen
Rev. 0 | Page 5 of 8
EVAL-ADM1087EB
ORDERING INFORMATION
EVAL-ADM1087EB BILL OF MATERIALS
Table 1.
Name
C1
C2
C3
C4
C5
C6
C7
C8
C9
D1
D2
D3
P1
Q1
Q2
Q3
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
Part Type
CAP
CAP
CAP
CAP
CAP
CAP
Wire Wrap Pins
Wire Wrap Pins
CAP
LED
LED
LED
BATT_PP3
BC850B
BC850B
BC850B
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
Value
1 µF
1 µF
1 µF
1 µF
1 µF
1 µF
R16
R17
R18
S1
S2
T1
T2
T3
T4
T5
T6
T7
U1
U2
U3
U4
RES
RES
RES
SW-SPDT-SLIDE
SW-SPDT-SLIDE
TESTPOINT
TESTPOINT
TESTPOINT
TESTPOINT
TESTPOINT
TESTPOINT
TESTPOINT
ADP3334
ADP3334
ADP3334
ADM1087
10 kΩ
10 kΩ
10 kΩ
1 µF
75 kΩ
150 kΩ
3.9 kΩ
10 kΩ
91 kΩ
110 kΩ
3.9 kΩ
10kΩ
150 kΩ
75 kΩ
3.9 kΩ
160 kΩ
51 kΩ
110 kΩ
51 kΩ
PCB Decal
0805
0805
0805
0805
0805
0805
CAP\MR04
CAP\MR04
0805
LED_SMT
LED_SMT
LED_SMT
BATT_PP3
SOT23
SOT23
SOT23
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
Part Description
16 V Y5V Ceramic Capacitor
16 V Y5V Ceramic Capacitor
16 V Y5V Ceramic Capacitor
16 V Y5V Ceramic Capacitor
16 V Y5V Ceramic Capacitor
16 V Y5V Ceramic Capacitor
Wire Wrap Pins × 2
Wire Wrap Pins × 2
16 V Y5V Ceramic Capacitor
HE Red LED
Yellow LED
Green LED
Pair Battery Connectors
npn BJT
npn BJT
npn BJT
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
0805
0805
0805
SW-SPDT-SLIDE
SW-SPDT-SLIDE
TESTPOINT
TESTPOINT
TESTPOINT
TESTPOINT
TESTPOINT
TESTPOINT
TESTPOINT
MSO8
MSO8
MSO8
SC70-6
0.1 W Resistor
0.1 W Resistor
0.1 W Resistor
SPDT Slide Switch
SPDT Slide Switch
Testpoint
Testpoint
Testpoint
Testpoint
Testpoint
Testpoint
Testpoint
LDO Regulator
LDO Regulator
LDO Regulator
Simple Sequencer
Rev. 0 | Page 6 of 8
Source
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Part Number
FEC 318-8899
FEC 318-8899
FEC 318-8899
FEC 318-8899
FEC 318-8899
FEC 318-8899
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
FEC 318-8899
FEC 515-607
FEC 515-619
FEC 515-620
FEC 723-988
FEC 305-0506
FEC 305-0506
FEC 305-0506
FEC 321-8284
FEC 912-116
FEC 911-926
FEC 911-975
FEC 32108296
FEC 321-8302
FEC 911-926
FEC 911-975
FEC 912-116
FEC 321-8284
FEC 911-926
FEC 321-8326
FEC 321-8260
FEC 321-8302
FEC 321-8260
Farnell
Farnell
Farnell
FEC 911-975
FEC 911-975
FEC 911-975
FEC 733-647
FEC 733-647
FEC 200-207
FEC 200-207
FEC 200-207
FEC 200-207
FEC 200-207
FEC 200-207
FEC 200-207
ADP3334ARM
ADP3334ARM
ADP3334ARM
ADM1087AKS
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Farnell
Analog Devices
Analog Devices
Analog Devices
Analog Devices
EVAL-ADM1087EB
Name
U5
U6
U7
U8
U9
Part Type
ADM1087
ADM1085-TEMP
ADM1086-TEMP
ADM1087-TEMP
ADM1088-TEMP
Feet
Value
PCB Decal
SC70-6
SC70-6
SC70-6
SC70-6
SC70-6
Part Description
Simple Sequencer
Simple Sequencer
Simple Sequencer
Simple Sequencer
Simple Sequencer
Rubber Stick-On Feet
Source
Analog Devices
Analog Devices
Analog Devices
Analog Devices
Analog Devices
3M
ORDERING GUIDE
Model
EVAL-ADM1087EB
Package Description
Evaluation Board for ADM1087 Simple Sequencer
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. 0 | Page 7 of 8
Part Number
ADM1087AKS
ADM1085AKS
ADM1086AKS
ADM1087AKS
ADM1088AKS
FEC 148-922
EVAL-ADM1087EB
NOTES
© 2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05074–0–9/04(0)
Rev. 0 | Page 8 of 8
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ADM1087 Simple Sequencer™ Evaluation Kit EVAL-ADM1087EB