The RM912 dual mode Code Division Multiple Access (CDMA)/Advanced Mobile
Phone Service (AMPS) Power Amplifier is a fully matched 6-pin LCC surface mount
module designed for mobile units operating in the 824-849 MHz cellular bandwidth.
This device meets stringent IS95 CDMA linearity requirements to beyond 28 dBm
output power and can be driven to power output levels beyond 31 dBm for high
efficiency FM mode operation. A single GaAs Microwave Monolithic Intergrated
Circuit (MMIC) contains all active circuitry in the module. The MMIC contains
on-board bias circuitry, as well as input and interstage matching circuits. The output
match is realized off-chip within the module package to optimize efficiency and power
performance into a 50
process that provides for all positive voltage DC supply operation while maintaining
high efficiency and good linearity. Primary bias to the RM912 can be supplied directly
from a three cell nickel-cadmium, single cell lithium-ion, or other suitable battery with
output in the 3-4 volt range. Power down is accomplished by setting the voltage on
the low current reference pin to zero volts. No external supply side switch is needed
as typical “off” leakage is a few microamperes with full primary voltage supplied from
the battery.
Ω load. This device is manufactured with Conexant’s GaAs HBT
Functional Block Diagram
VREF
(3)
VCC1
(1)(4)
VCC2
Distinguishing Features
• Low voltage positive bias supply
• Good linearity
• High efficiency
• Dual mode operation
• Large dynamic range
• 6-pin LCC package
(6 x 6 x 1.5 mm)
• Power down control
Applications
• Digital cellular (CDMA)
• Analog cellular (AMPS)
• Wireless local loop
Driver
Stage Bias
RF
Input
(2) (5)
Data Sheet100635G
2000, Conexant Systems, Inc. All Rights Reserved.August 2000
Input
Match
DA
GNDGND
(6, 7)
MMIC
Power
Stage Bias
Inter
Stage
Match
PA
(6, 7)
Output
Match
MODULE
RF
Output
Page 2
Electrical SpecificationsRM912
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Electrical Specifications
The following tables list the electrical characteristics of the RM912 Power Amplifier. Table 1 lists
the absolute maximum rating for continuous operation. Table 2 lists the recommended operating
conditions for achieving the electrical performance listed in Table 3. Tab l e 3 lists the electrical
performance of the RM912 Power Amplifier over the recommended operating conditions.
Table 1. Absolute Maximum Ratings
ParameterSymbolMinNominalMaxUnit
RF Input PowerPin—3.06.0dBm
Supply VoltageVcc—3.45.0Volts
Reference VoltageVref—3.03.3Volts
Case Operating TemperatureTc–3025+110°C
Storage TemperatureTstg–55—+125°C
NOTE(S):
(1)
No damage assuming only one parameter is set at limit at a time with all other parameters set at or below nominal value.
ACP is specified per IS95 as the ratio of the total in-band power (1.23 MHz BW) to adjacent power in a 30 kHz BW.
4Conexant100635G
Page 5
RM912 Characterization Data
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Characterization Data
The following charts illustrate the characteristics of a typical RM912 Power Amplifier tested in the
evaluation board described in the following section. The amplifier was selected by characterizing a
group of devices and choosing a part with average electrical performance at both nominal and
worst case (limit) conditions. Figures 1 through 4 illustrate the digital signal characteristics and
Figures 5 through 8 illustrate the analog characteristics of the RM912.
Figure 1. Digital Gain vs. Output Power
Vref = 3.0V, Vcc = 3.4V
32.50
30.00
27.50
Gain (dB)
25.00
22.50
0.005.0010.0015.0020.0025.0030.00
Output Power (dBm)
Legend
◆
■
▲
824 MHz @ –30 °C
837 MHz @ –30 °C
849 MHz @ –30 °C
◆
■
▲
100635GConexant5
824 MHz @ +25 °C
837 MHz @ +25 °C
849 MHz @ +25 °C
◆
■
▲
824 MHz @ +85 °C
837 MHz @ +85 °C
849 MHz @ +85 °C
Page 6
Characterization DataRM912
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Figure 2. Digital Adjacent Channel Power Magnitude (ACP1) vs. Output Power
Vref = 3.0V, Vcc = 3.4V, 885 kHz Off set
80.00
70.00
60.00
50.00
| ACP1 (dBc) |
40.00
30.00
20.00
0.005.0010.0015.0020.0025.0030.00
Output Power (dBm)
Figure 3. Digital Adjacent Channel Power Magnitude (ACP2) vs. Output Power
◆
■
▲
Legend
Vr ef = 3.0V , V c c = 3.4V, 1980 kHz Offset
80.00
70.00
60.00
50.00
| ACP2 (dBc) |
40.00
30.00
20.00
0.005.0010.0015.0020.0025.0030.00
Output Power (dBm)
◆
■
▲
824 MHz @ –30 °C
837 MHz @ –30 °C
849 MHz @ –30 °C
◆
■
▲
824 MHz @ +25 °C
837 MHz @ +25 °C
849 MHz @ +25 °C
824 MHz @ +85 °C
837 MHz @ +85 °C
849 MHz @ +85 °C
6Conexant100635G
Page 7
RM912 Characterization Data
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Figure 4. Digital Power Added Efficiency vs. Output Power
Vref = 3.0V, Vcc = 3.4V
40.00
35.00
30.00
25.00
20.00
DPAE (%)
15.00
10.00
5.00
0.00
0.005.0010.0015.0020.0025.0030.00
Output Power (dBm)
Figure 5. Analog Gain vs. Output Power
Vref = 3.0V, Vcc = 3.4V
32.50
30.00
27.50
Gain (dB)
25.00
22.50
0.005.0010.0015.0020.0025.0030.00
Output Power (dBm)
Legend
◆
■
▲
824 MHz @ –30 °C
837 MHz @ –30 °C
849 MHz @ –30 °C
◆
■
▲
100635GConexant7
824 MHz @ +25 °C
837 MHz @ +25 °C
849 MHz @ +25 °C
◆
■
▲
824 MHz @ +85 °C
837 MHz @ +85 °C
849 MHz @ +85 °C
Page 8
Characterization DataRM912
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Figure 6. Analog Power Added Efficiency vs. Output Power
Vref = 3.0V, Vcc = 3.4V
50.00
45.00
40.00
35.00
30.00
25.00
PAE (%)
20.00
15.00
10.00
5.00
0.00
0.005.0010.0015.0020.0025.0030.00
Output Power (dBm)
Figure 7. Analog Second Order Harmonic Suppression Magnitude
Vr ef = 3.0V , V c c = 3.4V
70.00
60.00
50.00
40.00
30.00
| AFo2 (dBc) |
20.00
10.00
0.00
10.0015.0020.0025.0030.00
Output Pow er (dBm)
Legend
◆
■
▲
824 MHz @ –30 °C
837 MHz @ –30 °C
849 MHz @ –30 °C
◆
■
▲
824 MHz @ +25 °C
837 MHz @ +25 °C
849 MHz @ +25 °C
◆
■
▲
824 MHz @ +85 °C
837 MHz @ +85 °C
849 MHz @ +85 °C
8Conexant100635G
Page 9
RM912 Characterization Data
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Figure 8. Analog Third Order Harmonic Suppression Magnitude
Vref = 3.0V, Vcc = 3.4V
70.00
60.00
50.00
40.00
30.00
| AFo3 (dBc) |
20.00
10.00
0.00
10.0015.0020.0025.0030.00
Output Power (dBm)
Legend
◆
■
▲
824 MHz @ –30 °C
837 MHz @ –30 °C
849 MHz @ –30 °C
◆
■
▲
100635GConexant9
824 MHz @ +25 °C
837 MHz @ +25 °C
849 MHz @ +25 °C
◆
■
▲
824 MHz @ +85 °C
837 MHz @ +85 °C
849 MHz @ +85 °C
Page 10
Characterization DataRM912
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Figure 9. Digital Gain vs. Output Power
40.00
35.00
30.00
25.00
20.00
15.0 0
10.0 0
5.00
Digital Gain at 28 dBm output power (dB)
0.00
3.20V
-30C
COL DR OOM T EMP E R A T UR EHOT
824 MH z836.5 MHz849 MHz
3.40V
-30C
4.20V
-30C
3.20V
25C
Coll ect or Volt age
Case Temperat ure
3.40V
25C
4.20V
25C
3.20V
85C
3.40V
85C
Figure 10. Digital Adjacent Channel Power Magnitude (ACP1) vs. Output Power
4.20V
85C
70.00
60.00
50.00
40.00
30.00
20.00
10.0 0
| ACP1 at 28 dBm Output Power (dBc) |
0.00
3.20V
-30C
COL DR OOM T EMP E R A T UR EHOT
824 MH z836.5 MHz849 MHz
3.40V
-30C
4.20V
-30C
3.20V
25C
Collector Voltage
C as e T emper at ur e
3.40V
25C
4.20V
25C
3.20V
85C
3.40V
85C
4.20V
85C
10Conexant100635G
Page 11
RM912 Characterization Data
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Figure 11. Digital Adjacent Channel Power Magnitude (ACP2) vs. Output Power
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
| ACP2 at 28 dBm Output Power (dBc) |
0.00
3.20V
-30C
COL DR OOM T EMP E R A T UR EHOT
824 MHz836.5 MHz849 MHz
3.40V
-30C
4.20V
-30C
3.20V
25C
3.40V
25C
4.20V
25C
3.20V
85C
Coll ector V o lt age
Case T emperatur e
3.40V
85C
4.20V
85C
Figure 12. Analog Gain vs. Output Power
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
Analog Gain at 31 dBm Output Power (dB)
3.20V
-30C
COL DR OOM T E M P E R AT U R EH OT
3.40V
-30C
4.20V
-30C
824 MHz836.5 MHz849 MH z
3.20V
25C
3.40V
25C
4.20V
25C
Collector V olt age
C as e T emper at ur e
3.20V
85C
3.40V
85C
4.20V
85C
100635GConexant11
Page 12
Characterization DataRM912
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Figure 13. Analog Second Order Harmonic Suppression Magnitude
70.00
60.00
50.00
40.00
30.00
20.00
10.00
| AFo2 at 31 dBm Output Power (dBc) |
0.00
3.20V
-30C
COLD
3.40V
-30C
4.20V
-30C
RO OM TEM PE RA TUREHOT
824 MH z836.5 MHz849 MHz
3.20V
25C
3.40V
25C
Collector Voltage
Case T emper ature
4.20V
25C
Figure 14. Analog Third Order Harmonic Suppression Magnitude
3.20V
85C
3.40V
85C
4.20V
85C
| AFo3 at 31 dBm Output Power (dBc) |
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
3.20V
-30C
COLD
3.40V
-30C
4.20V
-30C
RO OM TEMPERATURE
824 MH z 836.5 MHz 849 MHz
3.20V
25C
3.40V
25C
Coll ect or V ol t age
Case T emperatur e
4.20V
25C
3.20V
85C
HO T
3.40V
85C
4.20V
85C
12Conexant100635G
Page 13
RM912 Characterization Data
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Figure 15. Noise Figure Variation Over Recommended Operating Conditions
10.0 0
9.00
8.00
7.00
6.00
5.00
4.00
3.00
Noise Figure (dB)
2.00
1.0 0
0.00
3.20V
-30C
COLD
3.40V
-30C
4.20V
-30C
RO OM TEM PE RATUREHOT
824 MHz836.5 MHz849 MH z
3.20V
25C
3.40V
25C
4.20V
25C
Collector V oltage
Case T emperature
3.20V
85C
3.40V
85C
4.20V
85C
Figure 16. Voltage Standing Wave Ratio Variation Over Recommended Operating Conditions
2.00
1.80
1.60
1.40
1.20
1.00
0.80
VSWR (:1)
0.60
0.40
0.20
0.00
3.20V
-30C
COLDR OOM T E MP E R AT U R EH OT
824 MHz836.5 MH z849 MHz
3.40V
-30C
4.20V
-30C
3.20V
25C
3.40V
25C
4.20V
25C
3.20V
85C
Collector Volt age
Case Temperature
3.40V
85C
4.20V
85C
100635GConexant13
Page 14
Evaluation Board DescriptionRM912
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Evaluation Board Description
The evaluation board is a platform for testing and interfacing design circuitry. To accommodate the
interface testing of the RM912, the evaluation board schematic and diagrams are included for
preliminary analysis and design. Figure 17 shows the basic schematic of the board for the 824 MHz
to 849 MHz range. Figure 18 illustrates the board layout.
Figure 17. Evaluation Board Schematic
GND
RFOUT
VCC2
RFIN
Vref
C1
1
VCC1
2
RFIN
VREF
3
Figure 18. Evaluation Board Assembly Diagram
6
5
4
C2
RFOUT
C3C4
Vcc
100635_003
REF
DESIGNATIONS
C1
C2
C3
C4
VALUES QTY
100 pF
4.7 uF
39 pF
1000 pF1
1
1
1
100635_004
14Conexant100635G
Page 15
RM912 Package Dimensions and Pin Descriptions
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Package Dimensions and Pin Descriptions
The RM912 is a multi-layer laminate base, overmold encapsulated modular package designed for
surface mount solder attachment to a printed circuit board.
Figure 19. RM912 Package Drawing
PIN 1
PIN 2
PIN 3
5.92/6.15
[.2333/.242]
PIN 6
PIN 5
PIN 4
5.92/6.15
[.2333/.242]
1.500 [.060]
TYP
2.500
[.0098]
(4x)
(PIN 1)
PIN 7
2.870 [.113]
(2x)
1.981 [.078]
(2x)
COPPER
BOTTOM
1.219 [.048]
(2x)
2.006 [.079
2.500
[.0098]
(4x)
.762 [.030]
6x
R .500 TYP
[R .020 TYP]
2.870 [.113]
(4x)
1.854 [.073]
(6x)
1.245 [.049]
(2x)
(4X)
1.016 [.040]
SOLDER MASK
BOTTOM
100635_002
100635GConexant15
Page 16
Package Dimensions and Pin DescriptionsRM912
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Table 5. Pin Description
Pin #Function
1
2RF Input
3VREF
4
5RF Output
6GND
7
NOTE(S):
(1)
All supply pins may be connected together at the supply.
(2)
Package underside is GND.
Figure 20. Typical Case Markings
Mark Pin 1
Identifier
VCC1
VCC2
GND
(1)
(1)
(2)
CONEXANT
RM912-11
NXXXXX.XX
YYWW MEX
YY = Manufacture Year
WW = Week Package
MEX = Country Code
16Conexant100635G
Manufacturing
Part Number - Revision
Lot
Number
Sealed
100635_006
Page 17
RM912 Package Dimensions and Pin Descriptions
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Production quantities of this product are shipped in the standard tape-and-reel format illustrated
below.
Figure 21. 6 x 6 Tape and Reel
8.00 ± .10
PIN 1
4.00 ± .10
0.292 ± .02
1.50 ± .10
1.50 ± .25
1.75 ± .10
5.50 ± .10
12.00
+.30
-.10
8˚ MAX7˚ MAX
6.35 ± .10
000
AKB
3M Carrier Tape
1.59 ± .10
6.35 ± .10
100635_005
100635GConexant17
Page 18
Electrostatic Discharge SensitivityRM912
CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz)
Electrostatic Discharge Sensitivity
The RM912 is a Class I device. Figure 22 lists the Electrostatic Discharge (ESD) immunity level
for each pin of the RM912 product. The numbers in Figure 22 specify the ESD threshold level for
each pin where the I-V curve between the pin and ground starts to show degradation. The ESD
testing was performed in compliance with MIL-STD-883E Method 3015.7 using the Human Body
Model. Since 2000 volts represents the maximum measurement limit of the test equipment used,
pins marked > 2000 V pass 2000V ESD stress.
Figure 22. ESD Sensitivity Areas
> +1950 V
< -2000 V
> +2000 V
< -2000 V
> +2000 V
< -2000 V
VCC1
RF IN
VREF
16
RM912-14P
25
N14716.6
0015 Mexico
34
GND
RF OUT
VCC2
> +2000 V
< -2000 V
> +1400 V
< -2000 V
Various failure criteria can be utilized when performing ESD testing. Many vendors employ
relaxed ESD failure standards which fail devices only after “the pin fails the electrical specification
limits” or “the pin becomes completely non-functional”. Conexant employs most stringent criteria,
fails devices as soon as the pin begins to show any degradation on a curve tracer.
To avoid ESD damage, latent or visible, it is very important the Class-1 ESD handling precautions
listed in Tab le 6 be used in the product assembly and test areas follow.
100635_007
Table 6. Precautions for GaAs ICs with ESD Thresholds Greater Than 200V But Less Than 2000V
Personnel Grounding
Wrist Straps
Conductive Smocks, Gloves and Finger Cots
Antistatic ID Badges
Protective Workstation
Dissipative Table Tops
Protective Test Equipment (Properly Grounded)
Grounded Tip Soldering Irons
Conductive Solder Suckers
Static Sensors
18Conexant100635G
Relative Humidity Control and Air Ionizers
Dissipative Floors
Protective Packaging & Transportation
Bags and Pouches (Faraday Shield)
Protective Tote Boxes (Conductive Static Shielding)
Protective Trays
Grounded Carts
Protective Work Order Holders
(less than 109 Ω to GND)
Facility
Page 19
Ordering Information
Model Number
Manufacturing
Part Number
Product
Revision
PackageOperating Temperature
—RM912–146x6LM–6–30 °C to +85 °C
Revision History
RevisionLevelDateDescription
AMarch 2000Preliminary Information
BMarch 2000Updated Preliminary Information
CJune 2000Added Characterization Data, Released
DJuly 2000Updated ESD Data
EJuly 2000Preprint Update
FAugust 2000Web Site Update
GAugust 2000Web Format Corrections
Information in this document is provided in connection with Conexant Systems, Inc. (“Conexant”) products. These materials are
provided by Conexant as a service to its customers and may be used for informational purposes only. Conexant assumes no
responsibility for errors or omissions in these materials. Conexant may make changes to specifications and product descriptions at
any time, without notice. Conexant makes no commitment to update the information and shall have no responsibility whatsoever for
conflicts or incompatibilities arising from future changes to its specifications and product descriptions.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as
provided in Conexant’s Terms and Conditions of Sale for such products, Conexant assumes no liability whatsoever.
THESE MATERIALS ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING
TO SALE AND/OR USE OF CONEXANT PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A
PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTIAL DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY
PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. CONEXANT FURTHER DOES NOT WARRANT THE
ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE
MATERIALS. CONEXANT SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS, WHICH MAY RESULT FROM THE USE
OF THESE MATERIALS.
Conexant products are not intended for use in medical, life saving or life sustaining applications. Conexant customers using or selling
Conexant products for use in such applications do so at their own risk and agree to fully indemnify Conexant for any damages
resulting from such improper use or sale.
The following are trademarks of Conexant Systems, Inc.: Conexant™, the Conexant C™ symbol, and “What’s Next in
Communications Technologies”™. Product names or services listed in this publication are for identification purposes only, and may
be trademarks of third parties. Third-party brands and names are the property of their respective owners.
For additional disclaimer information, please consult Conexant’s disclaimer information posted at www.conexant.com
incorporated by reference.
Reader Response: Conexant strives to produce quality documentation and welcomes your feedback. Please send comments and
suggestions to conexant.tech.pubs@conexant.com. For technical questions, contact your local Conexant sales office or field
applications engineer.
which is
Page 20
0.0
Sales
Offi
ces
Further Information:
literature@conexant.com
1-800-854-8099 (North America)
33-14-906-3980 (International)
Web Site
www.conexant.com
World Headquarters
Conexant Systems, Inc.
4311 Jamboree Road,
P.O. Box C
Newport Beach, CA 92658-8902
Phone: (949) 483-4600
Fax: (949) 483-6375
U.S. Florida/South America
Phone: (727) 799-8406
Fax: (727) 799-8306
U.S. Los Angeles
Phone: (805) 376-0559
Fax: (805) 376-8180
U.S. Mid-Atlantic
Phone: (215) 244-6784
Fax: (215) 244-9292
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Phone: (630) 773-3454
Fax: (630) 773-3907
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Phone: (978) 692-7660
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Phone: (408) 249-9696
Fax: (408) 249-7113
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Phone: (972) 733-0723
Fax: (972) 407-0639
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Phone: (919) 858-9110
Fax: (919) 858-8669
U.S. Southwest
Phone: (949) 483-9119
Fax: (949) 483-9090
APAC Headquarters
Conexant Systems Singapore,
Pte. Ltd.
1 Kim Seng Promenade
Great World City
#09-01 East Tower
Singapore 237994
Phone: (65) 737 7355
Fax: (65) 737 9077
Australia
Phone: (61 2) 9869 4088
Fax: (61 2) 9869 4077
Hong Kong
Phone: (852) 2 827 0181
Fax: (852) 2 827 6488
India
Phone: (91 11) 692 4780
Fax: (91 11) 692 4712
Korea
Phone: (82 2) 565 2880
Fax: (82 2) 565 1440
Europe Headquarters
Conexant Systems France
Les Taissounieres B1
1681 Route des Dolines
BP 283
06905 Sophia Antipolis Cedex
France
Phone: (33 4) 93 00 33 35
Fax: (33 4) 93 00 33 03
Europe Central
Phone: (49 89) 829 1320
Fax: (49 89) 834 2734
Europe Mediterranean
Phone: (39 02) 9317 9911
Fax: (39 02) 9317 9913
Europe North
Phone: (44 1344) 486 444
Fax: (44 1344) 486 555
Europe South
Phone: (33 1) 41 44 36 50
Fax: (33 1) 41 44 36 90
Middle East Headquarters
Conexant Systems
Commercial (Israel) Ltd.
P.O. Box 12660
Herzlia 46733, Israel
Phone: (972 9) 952 4064
Fax: (972 9) 951 3924
Japan Headquarters
Conexant Systems Japan Co., Ltd.
Shimomoto Building
1-46-3 Hatsudai,
Shibuya-ku, Tokyo
151-0061 Japan
Phone: (81 3) 5371 1567
Fax: (81 3) 5371 1501
Taiwan Headquarters
Conexant Systems, Taiwan Co., Ltd.
Room 2808
International Trade Building
333 Keelung Road, Section 1
Taipei 110, Taiwan, ROC
Phone: (886 2) 2720 0282
Fax: (886 2) 2757 6760
China
Phone: (86 2) 6361 2515
Fax: (86 2) 6361 2516
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