GIGABIT DUAL
TRANSFORMERS
For Use with 150
Ω
Twinax Cable
Compliant with ANSI X3T9.5, FC-PH-3 Fibre
Channel Physical Layer Specification
Compliant with IEEE 802.3z PMD
Designed for fast rise-time and a low frequency
cutoff of 2.5 MHz
IC grade transfer-molded package withstands
235°C peak temperature profile
Electrical Specifications @ 25°C — Operating Temperature 0°C to 70°C
Part
Number
A6801
A6802
Turns Ratio
(±6%)
1CT:1CT
1:1
Primary Inductance
OCL (µH MIN)
(@ 20 mVrms, 100
kHz)
5.50
5.50
DCR
(Ω MAX)
0.21
0.21
Hi-Pot
(Vrms)
1500
1500
Rise Time
(ps MAX)
20-80%
350
280
Low Frequency
Cutoff
(-3 dB)
< 2.5 MHZ
< 2.5 MHZ
Mechanical
A680X
.090
2,29
.500 ±.010
12,70 0,25
.460 .280
11,68 7,11
.420 .295
10,67 7,49
.350
8,89
.050
1,27
Schematics
A6801
1:1
1
2
3
T1
1:1
6
11
10
9
7
8
16
15
14
A680X
Date Code Cntry of Origin
.030
0,76
SUGGESTED PAD LAYOUT
.018
X 16
0,46
T2
A6802
.220 ±.010
5,59 0,25
.050
X7
1,27
.350
8,89
.004/0,10
16 SURFACES
1:1
1
0–8°
.020
MIN
0,51
16
.005 .015
–
0,13 0,38
3
T1
1:1
6
14
11
Dimensions:
Inches
mm
Unless otherwise specified, all tolerances are ± .005
0,13
Weight
. . . . . . . . . . . .1.4 grams
Tape & Reel
. . . . . . . . .500/reel
Tube
. . . . . . . . . . . . . . .45/tube
8
T2
9
NOTE:
For lower speed Fibre Channel applications, please refer to application note on data sheet A101.
U.S.A:
TEL 619 674 8100
•
EUROPE:
TEL 441 483 401 700
•
ASIA:
TEL 886 7 821 3141
•
WEB:
http://www.pulseeng.com
A100.A (1/99)
GIGABIT DUAL
TRANSFORMERS
Application Notes:
For Use with 150
Ω
Twinax Cable
Pulse has designed Gigabit Dual Transformers speci-
fically for point to point coupling to 150
Ω
Twinax cable.
The isolation transformers protect the station from static
charges that may develop on the cable and prevent
ground loop currents from being transferred between
stations. The devices have also been designed to provide
common mode rejection within the transmission band and
D.C. Gnd.
thus reduce EMI. The bandwidth of these devices
minimizes data dependent jitter by providing fast signal
rise times. The dual package allows connection of both
the transmit and receive channels as shown in the
application circuit below. Surface mount packaging also
allows a cost effective solution. The transformers are
available in either tubes or Tape & Reel packaging.
Chassis Gnd.
C3
VCC GND
120 200
R1
TX+
TX-
C1
.027 µF
TX+
DATE CODE
Chassis Gnd.
TX-
SERDES
CHIP SET
RX-
RX+
120 200
VCC
R2
GND
150
A6801
Chassis Gnd.
HSDCC OR DB9
CONNECTOR
RX-
RX+
CTRY ORIGIN
75
Ω
TRANSMISSION LINES
C2
.027 µF
C4
D.C. Gnd.
Chassis Gnd.
1. R1 and R2 values should be based upon the transmit
amplitude required for the system. Placing a short
(0
Ω)
will result in maximum amplitude. However,
doing so will result in distortion on the output due to
impedance mismatch. For optimum design, R1 and
R2 should be approximately 68
Ω
for each leg. This
will result in a -6.0 dB insertion loss (transmitter
section). If this is too much insertion loss, then at
least a 15
Ω
for R1 and R2 is recommended.
Insertion Loss of Transmitter:
Req = R1 + R2 and Zo = 150
Ω
Insertion Loss = 20 log [Zo / Req + Z0]
2. When designing PCB layout, transmission line
methods must be utilized to maintain return loss and
signal integrity. Transformer should be located within
1" of cable connector.
3. tr
transformer
=
√
[ (tr
out
)
2
- (tr
in
)
2
]
4. The typical application circuit shown above is a sug-
gested layout. Actual board layout may vary based
upon individual applications and EMC concerns.
NOTE:
These gigabit dual transformers are packaged in tubes unless Tape &
Reel is specified. When ordering, add the suffix
“T”
(i.e. A6801T) for
“Tape & Reel”
packaging in increments of 500.
For More Information :
Corporate
12220 World Trade Drive
San Diego, CA 92128
Tel: 619 674 8100
FAX: 619 674 8262
http://www.pulseeng.com
Quick-Facts: 619 674 9672
Europe
1 & 2 Huxley Road
The Surrey Research Park
Guildford, Surrey GU2 5RE
United Kingdom
Tel: 44 1483 401700
FAX: 44 1483 401701
Asia
150 Kampong Ampat
#07-01/02
KA Centre
Singapore 368324
Tel: 65 287 8998
FAX: 65 280 0080
Distributor
Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product
names mentioned herein may be trademarks or registered trademarks of their respective owners.
Printed on recycled paper. ©1999, Pulse Engineering, Inc.
A100.A (1/99)
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