Document 201-1
HDSLTransformers
This product is not RoHS-compliant. Contact Coilcraft
for current status or possible alternatives.
These HDSL transformers have been designed to work
with a variety of specific transceiver chips to provide
2B1Q coded data transmission.
They’re engineered for low leakage inductance and
return loss as well as high line isolation. Longitudinal
balance and THD are optimized for the best overall
performance at a given transmission speed.
Coilcraft can also custom engineer a transformer to
meet your specific requirements. For free evaluation
samples, contact Coilcraft or visit www.coilcraft.com.
Specifications
Data
rate
(kb/s)
Turns
ratio
chip:line
Primary
inductance
ꢀ6 (mꢁ)
Leakage
inductance
max (µꢁ)
DCR max (Ohms)
Part
number
Chip set
Chip side
Line side
HD6788
HD6789
Brooktree BT8952
Brooktree BT8952
784
1168
2CT:1:1
2CT:1:1
3.0
2.0
20
20
4.4 (2-4)
4.4 (2-4)
2.2 (6-7, 8-9)
2.2 (6-7, 8-9)
HD6790
HD6791
Brooktree BT8921
Brooktree BT8921
784
1168
1CT:1:1
1CT:1:1
3.0
2.0
20
20
2.2 (2-4)
2.2 (2-4)
2.2 (6-7, 8-9)
2.2 (6-7, 8-9)
HD6792
HD6793
Level One SK70704
Level One SK70704
784
1168
1CT:1.8 CT
1CT:1.8 CTS
2.75
2.06
45
40
3.2 (2-4)
2.0 (2-4)
3.0 (6-8, 8-10)
2.0 (6-7, 9-10)
DC bias
capacity
(mA)
Dielectric
strength
min (V)
Part
number
Return loss min
(dB)
Longitudinal balance typ
(dB)
TꢁD typ
(dB)
HD6788
HD6789
160
160
1500
1500
18 @ 40 - 200 kHz
16.5 @ 40 - 320 kHz
69 @ 30 kHz 63 @ 196 kHz
77 @ 30 kHz 63 @ 292 kHz
-74 @ 100 kHz
-74 @ 100 kHz
HD6790
HD6791
80
80
1500
1500
18 @ 40 - 200 kHz
16.5 @ 40 - 320 kHz
68 @ 30 kHz 56 @ 196 kHz
75 @ 30 kHz 62 @ 292 kHz
-74 @ 100 kHz
-74 @ 100 kHz
HD6792
HD6793
80
80
1500
1500
18 @ 40 - 200 kHz
16.5 @ 40 - 320 kHz
60 @ 30 kHz 48 @ 196 kHz
60 @ 30 kHz 48 @ 292 kHz
-75 @ 5 kHz
-74 @ 5 kHz
1. All electrical specifications referenced to line side.
2. Operating temperature range -40°C to +85°C.
3. Electrical specifications at 25°C.
Specifications subject to change without notice.
Please check our website for latest information. Document 201-1 Revised 02/11/08
© Coilcraft, Inc. 2007