Tibeliusgatan 7
S-761 50 NORRTÄLJE
SWEDEN
International
+46 - 176 13930
+46 - 176 13935
Domestic
0176-13930
0176-13935
Phone
Fax
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Transformers for splitting
LL1570 and LL1570XL
The LL1570 is designed for splitting signals in application where large ground differences may appear, but is also very
useful as a general purpose audio transformer. By careful design, the capacative coupling between the different part of
the transformer is kept to a minimum. The three-section winding structure which is necessary for decoupling also results
in a very high bandwidth. The transformer is built up from two coils, each with primary and secondary windings
separated by electrostatic shields, and a high permeability mu-metal core. The two coil structure in combination with the
mu-metal can results in high immunity to external magnetic fields.
In the LL1570XL, the core is about 45% larger than in the LL1570, resulting in a larger level capability.
Turns ratio:
1 + 1 : 1 + 1
Pin layout (viewed from component side) and winding schematics:
E 2
5
1
4
3
2
1
8
7
6
5
E1
E2
2
4
6
8
EP LL1570
(top view)
3
7
E 1
EP = Can and core
Spacing between
pins
Spacing between
rows of pins
Offset of earth pin from
adjacent row:
Recommended
PCB hole diameter:
5.08 mm (0.2")
27.94 mm (1.1")
2.54 mm (0.1")
1.5 mm
LL1570
LL1570XL
Dimensions (Max. L x W x H above PCB(mm)) 38 x 24 x 17
38 x 24 x 20.5
Weight:
48 g
65 g
Static resistance of each primary:
Static resistance of each secondary:
Distortion (primary level, primaries connected
in series, source impedance 800Ω )
Self resonance point :
50 Ω
50 Ω
62 Ω
62 Ω
0.1% @ + 6 dBU, 50 Hz
1 % < @ +16 dBU, 50 Hz
> 250 kHz
0.1% @ + 9 dBU, 50 Hz
1 % < @ +19 dBU, 50 Hz
> 250 kHz
Optimum load for best square-wave response
(secondaries. in series):
2.8 kΩ in series with 0.7 nF
2.8 kΩ in series with 0.7 nF
10 Hz -- 200 kHz +/- 0.5 dB 10 Hz -- 200 kHz +/- 0.5 dB
Frequency response (source 600Ω, load as
above, serial-serial connections):
Isolation winding-winding / winding-shield /
shield-shield
4 kV / 2 kV / 2 kV
4 kV / 2 kV / 2 kV
Serial-serial connection (1 : 1)
for line input or output
Parallel-parallel connection (1 : 1)
(e.g. mic input)
Parallel-serial connection (1 : 2)
(e.g. mic. input)
+
+
+
4
3
2
1
8
7
6
5
4
3
2
1
8
4
3
2
1
8
7
6
5
E1
E2
E1
E2
E1
E2
7
6
EP
EP
EP
5
Parallel-split connection with separate grounds (1 : 1 + 1)
4
3
2
1
8
7
6
5
E1
EP
E2
R980616
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