Tibeliusgatan 7
S-761 50 NORRTÄLJE
SWEDEN
International
+46 - 176 13930
+46 - 176 13935
Domestic
0176-13930
0176-13935
Phone
Fax
ꢀꢁꢂꢃꢄꢅꢀ
ꢆꢇꢄꢂꢈꢉꢊꢇꢋꢌꢇꢈ
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