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ADSL Interface Transformers
Document 255
Specifications subject to change without notice.
Document 255
Revised 11/02/04
These transformers provide coupling and line isolation
for ADSL interfaces using the Virata Beryllium chip set.
They feature very low leakage inductance, stable pri-
mary inductance from -40°C to +85°C and longitudinal
balance optimized for the best overall performance at
ADSL transmission speeds.
In addition to the standard model shown, Coilcraft can
provide custom transformers with other turns ratios.
For free evaluation samples or to discuss custom de-
signs, contact Coilcraft or visit www.coilcraft.com.
1. All electrical specifications referenced to line side.
2. Operating temperature range -40°C to +85°C.
3. Electrical specifications at 25°C.
Line side
Leakage
Part
inductance
inductance
DCR max (Ohms)
number
Style
Chip set
(mH)
max (µH)
Chip side
Line side
X8388-C
SMT
Virata Beryllium
600 ±5%
6
1.27 (7-6), 1.19 (9-8)
1.16 (2-3, 4-5)
Dielectric
Longitudinal
Part
strength
Turns ratio
balance
Designed
number
(V)
line : chip
min (dB)
to meet
X8388-C
2300
1 : 1.21
45 (20 kHz – 600 kHz)
UL 1950
For Virata
Beryllium chipset
A max B max
C max
E
F typ
G typ
0.530
0.699
0.500
0.590
0.098
0.061 × 0.050
13,46
17,75
12,70
14,99
2,50
1,55 × 1,27
Tape and reel:
175/13
″ reel 32 mm tape width
For packaging data see Tape and Reel Specifications section.
Recommended
Land Pattern
A
Dot above pin1
C
B
E
F
G
6
10
5
1
8
6
3
5
9
7
2
4
Line side
Chip side
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