Coilcraft AS7787-A Adsl transformer Datasheet

Document 244-1
ADSL Transformers
For Analog Devices
chipsets
This product is not RoHS-compliant. Contact Coilcraft
for current status or possible alternatives.
These transformers have been designed to provide
optimum performance with various ADSL chip sets from
Analog Devices.
They feature a compact size, minimum DC resistance
and very low leakage inductance. Primary inductance is
stable from -40°C to +85°C and the longitudinal balance
is optimized for the best overall performance at the
ADSL transmission speed. Most parts have been designed to meet UL 1950 requirements.
For free evaluation samples or to discuss custom designs, please contact Coilcraft.
SPECIFICATIONS
Part
number
Style
AS7787-A
AS8456-A
AS8923-A
AS8908-A
AS8925-A
AS8924-A
Leaded
SMT
Leaded
SMT
Leaded
SMT
Chip set
Line side
inductance
(mH)
Leakage
inductance
max (µH)
AD20MSP910/918 CO/CPE
AD20MSP910/918 CO/CPE
AD20MSP930 CO
AD20MSP930 CO
AD20MSP930 CPE
AD20MSP930 CPE
5.0 ± 10%
5.0 ± 10%
2.03 min
2.03 min
2.42 min
2.42 min
16
16
7.5
7.5
7.5
7.5
Part
number
Dielectric
strength
(V)
Turns ratio
line:chip
Capacitance
max (pF)
AS7787-A
AS8456-A
AS8923-A
AS8908-A
AS8925-A
AS8924-A
1875
1875
2300
2300
2300
2300
1:1
1:1
1.1:1
1.1:1
1.2:1
1.2:1
55
55
DCR max (Ohms)
Chip side
Line side
1.21 (10-8), 1.65 (9-7)
1.21 (10-8), 1.65 (9-7)
0.60 (1-3, 2-4)
0.60 (1-3, 2-4)
0.55 (1-3, 2-4)
0.55 (1-3, 2-4)
Longitudinal
balance
min (dB)
40
40
40
40
40
40
(20
(20
(20
(20
(20
(20
kHz – 1.1
kHz – 1.1
kHz – 1.1
kHz – 1.1
kHz – 1.1
kHz – 1.1
THD
@ 20 kHz
typ (dB)
MHz)
MHz)
MHz)
MHz)
MHz)
MHz)
-89
-89
-85
-85
-85
-85
1.42 (1-3, 2-4)
1.42 (1-3, 2-4)
0.60 (10-8), 0.60 (9-7)
0.60 (10-8), 0.60 (9-7)
0.58 (10-8), 0.58 (9-7)
0.58 (10-8), 0.58 (9-7)
Designed
to meet
UL
UL
UL
UL
UL
UL
1459,
1459,
1459,
1459,
1459,
1459,
1950
1950
1950
1950
1950
1950
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.
© Coilcraft, Inc. 2008
Document 244-1
Revised 09/25/08
Document 244-2
ADSL Transformers for Analog Devices
Leaded Transformers
Surface Mount Transformers
B
Dot above pin1
10
1
C
C
A
6
5
B
D
E
E
6
6
5
10
1
F
5
F
A
F
H
G
10
1
Recommended
Board Layout
A max B max C max
D min E
F typ
G dia
G
Recommended
Land Pattern
H dia
A max
B max
C max
E
F typ
G typ
0.550
0.550
0.500
0.100
0.400 0.100
0.013
0.032
0.530
0.699
0.500
0.590
0.098
0.050 × 0.061
13,97
13,97
12,70
2,54
10,16 2,54
0,33
0,82
13,46
17,75
12,70
14,99
2,50
1,27 × 1,55
Schematics
AS7787-A, AS8456-A
Line
side
AS8923-A, AS8908-A
AS8925-A, AS8924-A
Chip
side
Line
side
Chip
side
1
10
10
1
3
8
8
3
2
9
9
2
4
7
7
4
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2008
Document 244-2
Revised 09/25/08
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