Document 443
ADSL Transformers
The B0726-E and C1350-A ADSL transformers have
been approved by Broadcom for use with their BCM6335,
BCM6338, BCM6345, and BCM6348 ADSL CPE Mo-
dem chipsets and their BCM6301 5-Volt Line Driver.
These transformers feature split windings for chip re-
ceive, chip transmit and line side. They offer 1875 Vrms
For Broadcom ADSL
CPE Modem chipsets
isolation, low DC resistance, low leakage inductance and
excellent total harmonic distortion. Their compact design
makes them suitable for high density applications.
Coilcraft can also custom design transformers to meet
your specific requirements. For free evaluation samples,
contact Coilcraft or visit
www.coilcraft.com.
Part
number
B0726-E
ADSL Inductance
1
Annex ±5% (µH)
A
400
DCR max
(Ohms)
0.815 (1 – 3) (2 – 4)
0.232 (5 – 7) (6 – 8)
0.831(16 – 11) (14 – 9)
0.815 (1 – 3) (2 – 4)
0.232 (5 – 7) (6 – 8)
0.831 (16 – 11) (14 – 9)
Leakage
Interwinding
Turns ratio
inductance
2
capacitance
3
max (µH)
(pF)
chip tx : chip rx chip tx : line
18.0
22.0
1 : 4.25
1 : 4.25
THD
4
typ (dB)
-95.0
C1350-A
B
100
18.0
22.0
1 : 4.25
1 : 4.25
-93.0
1. Inductance measured at 10 kHz, 0.1 Vrms, 0 Adc between pins 9 and 16 with pins 11 and 14 connected.
2. Leakage inductance measured at 100 kHz, 0.1 Vrms between pins 9 and 16 with all other pins shorted.
3. Capacitance tested between pins 1 and 16 with all other pins shorted.
4. Total harmonic distortion measured at 30 kHz.
5. Operating temperature range
−40°C
to +85°C.
6. Electrical specifications at 25°C
5
0.500 max
12,70
9
Chip
transmit
0.650max
16,51
0.590
14,99
0.004 / 0,10
7
6
14
11
Line
side
0.067
1,70
16
0.670
17,02
1
0.039
1,00
8
1
16
1
0.550 max
13,97
8
9
0.020
0,51
Chip
receive
0.067
1,70
3
2
0.201
5,10
0.099
2,51
4
Recommended
Land Pattern
Terminations:
Nickel/gold over phos bronze
Tape and reel:
200/13″ reel 44 mm tape width
For packaging data see Tape and Reel Specifications section.
Specifications subject to change without notice.
Please check our website for latest information.
Document 443
Revised 03/30/05
© Coilcraft, Inc. 2005
Embedded System
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