Preliminary Specifications
Low Cost SMT 8dB Bi-Directional Coupler
CH20-0035-8G
824 - 960 MHz
V1.00
Features
q
q
q
q
q
q
q
SO-8
PIN 8
.1497-.1574
(3.80-4.00)
-B-
.2284-.2440
(5.80-6.20)
.010(0.25) M B M
Bi-Directional
Small Size and Low Profile
Industry standard SOIC-8 SMT Plastic Package
Superior Repeatability
Typical Insertion Loss 0.3 dB
Typical Directivity 15 dB
2 Watt Power Handling
Orientation
mark
PIN 1
.1890-.1968
(4.80-5.00)
-A-
.004 (0.10)
Description
M/A-COM’s CH20-0035-8G is an IC based monolithic bi-
directional coupler in a low cost SOIC-8 plastic package.
This 8 dB coupler is ideally suited for applications where
power monitoring, small size, low insertion loss, superior
repeatability and low cost are required. Typical applica-
tions include base station switching networks, power
monitoring in handhelds and other communication
applications where size and PCB real estate is a premi-
um. Available in tape and reel.
The CH20-0035-8G is fabricated using a passive-integrated
circuit process. The process features full chip passivation
for increased performance and reliability.
.0532-.0688
(1.35-1.75)
0°-8°
-C-
.0040-.0098
(0.10-0.25)
.013-.020 TYP.
(0.33-0.51)
.0099-0.0196
x 45° Chamfer
(0.25-0.50)
.016-.050
(0.40-1.27)
.0075-0.0098
(0.19-0.25)
.050(1.27) BSC.
.010(0.25) M C A M B S
8- Lead SOP outline dimensions
Narrow body .150
(All dimensions per JEDEC No. MS-012-AA, Issue C)
Dimensions in ( ) are in mm.
Unless Otherwise Noted: .xxx = ± 0.010 (.xx = ± 0.25)
.xx = ± 0.02 (.x = ±0.5)
Ordering Information
Part Number
CH20-0035-8G
CH20-0035-8G-TR
CH20-0035-8G-RTR
Description
SOIC-8 Lead Plastic Package
Forward Tape & Reel*
Reverse Tape & Reel*
* If specific reel size is required, consult factory for part number
assignment.
Typical Electrical Specifications
1
@
T
A
= +25°C
Parameter
Insertion Loss
VSWR
Coupling
Coupling Flatness
Directivity
Unit
dB
-
dB
dB
dB
Min.
-
-
-
-
10
Typ.
0.3
1.3:1
8 ±2
1.2
15
Max.
0.7
1.6:1
-
1.5
-
1. All specifications apply with a 50-ohm source and load impedance.
M/A-COM, Inc.
North America:
The Preliminary Specifications Data Sheet Contains Typical Electrical Specifications Which May Change Prior to Final Introduction.
1
Tel. (800) 366-2266
Fax (800) 618-8883
s
Asia/Pacific: Tel. +81 3 3263 8761
Fax +81 3 3263 8769
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
Low Cost SMT 8dB Bi-Directional Coupler
Absolute Maximum Ratings
1
Parameter
Input Power
Operating Temperature
Storage Temperature
Absolute Maximum
2W CW
-40°C to +85°C
-65°C to +150°C
CH20-0035-8G
V1.00
Functional Diagram
1
RF IN
8
RF OUT
1. Exceeding these limits may cause permanent damage.
GND
GND
-8dB
GND
.081
TYP.
RF IN
RF OUT
.018 DIA. PLATED
THRU (12X)
.244
.030
TYP.
COUPLED
Recommended PCB Configuration
.035 TYP.
GND
COUPLED
.050 DIA. PLATED
THRU (2X)
ISOLATED
ISOLATED
4
5
Note: Pins 2, 3, 6, and 7 must be RF and DC grounded.
.072
TYP.
.244
(Dimensions in Inches)
Circuit Material: FR-4, 0.16 Thick
Typical Performance
@ +25°C
DIRECTIVITY vs. FREQUENCY
0
Pin (4 to 8) – Pin (1 to 4) or
(
Pin
)
(1
(
to 5) – Pin (5 to 8)
)
0
INSERTION LOSS vs. FREQUENCY
Pin 1 to 8 or Pin 4 to 5 (Includes loss due to coupling)
DIRECTIVITY (dB)
-5
-10
-15
-20
-25
-30
700
INSERTION LOSS (dB)
-0.5
-1
-1.5
750
800
850
900
950
1000 1050 1100
-2
700
750
800
850
900
950
1000 1050 1100
FREQUENCY (MHz)
FREQUENCY (MHz)
1.7
1.6
VSWR vs. FREQUENCY
COUPLING vs. FREQUENCY
-5
-5.5
-6
-6.5
-7
-7.5
-8
-8.5
-9
-9.5
-10
700
Pin 5 to 8 or Pin 1 to 4
VSWR (dB)
1.5
1.4
1.3
1.2
1.1
1
700
750
800
850
900
950
1000 1050 1100
COUPLING (dB)
750
800
850
900
950
1000 1050 1100
FREQUENCY (MHz)
FREQUENCY (MHz)
2
The Preliminary Specifications Data Sheet Contains Typical Electrical Specifications Which May Change Prior to Final Introduction.
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
s
Asia/Pacific: Tel. +81 3 3263 8761
Fax +81 3 3263 8769
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
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