Page 1
+
+ +
for low loss isolation application
LUNDAHL
TRANSFORMERS
8 214
5
7
10 9 6
4 2 1 10 9 7 5 6
8 4 2 1 10 9 7 5 6
8
4 2 1 10 9 7 5 6
8
+
4 2 1 10 9 7 5 6
8
Tibeliusgatan 7 International Domestic
S-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930
SWEDEN Fax +46 - 176 13935 0176-13935
High Level General Purpose Transformer
LL1588
LL1588 is a high-level general-purpose transformer which can be used for microphone or line input, for line output
and for galvanic isolation. The windings are arranged to give perfect symmetry if the transformer is used in phase
splitting input applications. The two coils structure also greatly improves immunity to external magnetic fields from
e.g. power supplies and motors. Primary and secondary windings are separated by electrostatic shields. The core is a
high permeability mu metal core. The transformer is housed in a mu-metal can.
Turns ratio: 1 + 1 : 1 + 1
Pin layout (viewed from component side) and winding schematics:
LL1588
Top view
Dimensions (L x W x H above PCB, in mm)
Spacing between pins
Spacing between rows of pins
Rec. PCB hole diameter:
Weight:
Static resistance of each primary:
Static resistance of each secondary:
Distortion (primaries connected in series,
source impedance 150Ω ):
Distortion (primaries connected in parallel,
source impedance 150Ω ):
Self resonance point:
Frequency response (source 150Ω, load 10 kΩ,
47 x 28 x 24
5.08 mm (0.2")
35.56 mm (1.4")
1.5 mm
115 g
61Ω
61Ω
+ 25 dBU 0.1% @ 50 Hz
+ 28 dBU < 1 % @ 50 Hz
+ 16 dBU 0.1% @ 50 Hz
+ 22 dBU < 1 % @ 50 Hz
> 250 kHz
10 Hz -- 100 kHz +/- 1.0 dB
serial connection):
Phase response (deviation from linear phase)
20 Hz – 20kHz, +/- 0.5°
Isolation between windings/ between windings and shield: 4 kV / 2 kV
Connection alternatives and suggested applications:
Serial-serial connection (1 : 1) for high level line
isolation
Parallel-parallel connection (1 : 1)
LL1588
Top view
Centertap
LL1588
Top view
Phase splitting
for 1 : 1+1 input
LL1588
Top view
R030624
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