
LL1580 Splitting Transformer
The LL1580 is designed for splitting signals in application where large and noisy ground differences appear, but where
external magnetic fields are under control. By careful design, including double electrostatic shields, the capacative
coupling between the different parts of the transformer is kept to a minimum. The transformer is built up from two coils,
each with primary and secondary windings separated by double 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.
Turns ratio: 1 + 1 : 1 + 1
Pin layout (viewed from component side) and winding schematics:
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
Dimensions (Max. L x W x H above PCB(mm))
38 x 24 x 20.5
Weight:
61 g
Static resistance of each primary:
40
Ω
Static resistance of each secondary:
49
Ω
Self resonance point :
> 200 kHz
Optimum load for best square-wave response (secondaries. in series):
4 k
Ω
in series with 0.5 nF
Test arrangements for distortion and frequency response tests:
Parallell input - parallel output . Source 150
Ω
, load 100 k
Ω
Distortion
0.1% @ + 0 dBU, 50 Hz
1 % < @ +10 dBU, 50 Hz
Frequency response (Ref : -6 dBu, 1kHz)
10 Hz -- 100 kHz +/- 0.5 dB
Isolation winding-winding / winding-shield / shield-shield 4 kV / 2 kV / 2 kV
Parallel-parallel connection (1 : 1)
(e.g. mic input)
Serial-serial connection (1 : 1)
for line input or output
Parallel-serial connection (1 : 2)
(e.g. mic. input)
E2
EP
3
2
1
8
7
6
4
5
+
E2
EP
3
2
1
8
7
4
5
+
E2
EP
3
2
1
8
7
6
4
5
E1
+
Parallel-split connection with separate grounds (1 : 1 + 1)
E1
EP
E2
R981105
Tibeliusgatan 7 International Domestic
S-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930
SWEDEN Fax +46 - 176 13935 0176-13935
EP also can + core
E 1
E 2
2
1
3
4
6
5
7
8
3
2
1
8
7
6
4
5
E2
E1
EP LL1580
(top view)
EP
Application examples. Viewed from component side