high frequency magnetics

HIGH FREQUENCY MAGNETICS
Through Hole Wideband Signal Splitter
•
TM00151
Through hole, equal-ratio 3-port hybrid transformer
designed for both analog and digital applications
requiring signal splitting or combining
•
Operating temperature range -40° C to +85° C
•
Meets IEC 695, 2-2 flammability requirements
•
Extremely wide frequency response
•
PWB Process Capability: standard printed wiring board
assembly techniques, total-immersion cleaning
•
Very fast rise time
•
Reliability testing: shock, vibration, temperature cycling,
temperature - humidity - bias
ELECTRICAL SPECIFICATIONS at 25° C
Impedance
Ratio
Nominal
Signal Split
dB
3dB Bandwidth
typ
(1-6) : (3-6) + (4-6)
(1-6) to (3-6)
(1-6) to (4-6)
(1-6) to (3-6)
(1-6) to (4-6)
75Ω : 75Ω + 75Ω
3.0
20 kHz - 800 MHz
Part Number
2689J2
Return Loss (RL) typ
Pulse
Rise Time
ns typ
0.5
Transhybrid Loss (THL) typ
Port
RL>20 db
RL>30 db
A
100 kHz - 500 MHz
400 kHz - 200 MHz
B
200 kHz - 500 MHz
2 MHz - 300 MHz
C
200 kHz - 500 MHz
2 MHz - 300 MHz
Port
THL>20 db
THL>30 db
B to C
100 kHz - 800 MHz
300 kHz - 500 MHz
Port A = ASIG to GND
Port B = BSIG to GND
Port C = CSIG to GND
MECHANICAL
0.70 [17.78]
max
0.45
[11.43]
max
SCHEMATIC
ASIG 1
3 BSIG
0.120 ±0.006
[3.05 ±0.15]
0.023 [0.58] Sq typ
(Phosphor bronze,
solder-coated)
Terminal 1 ID
5
2
GND 6
0.40
[10.16]
max
1
2
3
6
5
4
0.250
[6.35]
4 CSIG
Bottom
View
0.200
[5.08]
0.400
[10.16]
0.120
[3.05]
Unless otherwise specified, dimensions are
nominal and in inches (millimeters).
©2000 Bel Fuse Inc. Specifications subject to change without notice. 09.00
Bel Fuse Inc. 198 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
T1-119
HIGH FREQUENCY MAGNETICS
Through Hole Wideband Signal Splitter
TM00151
PIN DIAGRAM
APPLICATIONS NOTES
The 2689J2 hybrid transformer operates with 75Ω
terminations over an extremely wide frequency
spectrum (3 dB response: 20 kHz to 800 MHz).
It can also be used as a pulse transformer with
very fast pulses (typical rise time: 0.5 ns). The
2689J2 operates as either a signal splitter or a
signal combiner. As a signal splitter, the transformer provides two identical output signals
(which are in phase with each other) from a
single input. Each of the two output signals is
3 dB down from the input signal (half the power
of the input signal). There is a high degree of
separation or transhybrid loss between the two
output signals. As a signal combiner, the transformer provides a single output signal from two
identical input signals (which are in phase with
each other). The output signal has twice the
power of either input signal.
2689J2
ASIG
1
6
GND
COM1
2
5
COM2
BSIG
3
4
CSIG
SIGNAL SPLITTER
INPUT
2689J2
75
LINE
ASIG
OUTPUT
75
LINE
BSIG
COM1
R1
OUTPUT
COM2
PIN DESCRIPTIONS AND TERMINATIONS
75
LINE
CSIG
C1
GND
Pin
1
Symbol Name and Function
ASIG
A signal. Input for splitter configuration.
Output for combiner application.
2
COM1
Common point of transformer 1.
SIGNAL COMBINER
Must be connected externally to COM2.
3
BSIG
B signal. Output for splitter configuration.
4
CSIG
COM2
C signal. Output for splitter configuration.
INPUT
75
LINE
GND
Ground. Connect to circuit ground.
R1
162Ω external resistor.
C1
BSIG
Common point of transformer 2.
COM1
R1
Must be connected externally to COM1.
6
75
LINE
ASIG
Input for combiner application.
5
OUTPUT
2689J2
Input for combiner application.
75
LINE
INPUT
CSIG
COM2
C1
GND
7 pF external capacitor.
©2000 Bel Fuse Inc. Specifications subject to change without notice. 09.00
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
198 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
Bel Fuse Ltd.
8F / 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com
T1-120