LL1545A Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – Audio Transformer

 
   
Tibeliusgatan 7
S-761 50 NORRTÄLJE
SWEDEN
Phone
Fax
International
+46 - 176 13930
+46 - 176 13935
Domestic
0176-13930
0176-13935
Audio Transformer
LL1545A
LL1545A is a general-purpose audio transformer with a variety of connection alternatives. The transformer is
built up from two coils, each with a secondary winding surrounded by shields and two primary windings. This
structure results in an excellent frequency response. The transformer can be used in many different applications
such as a high impedance line input transformer (accepting signal levels of 22 dBU @ 40 Hz with primaries in
series), for splitting or as a microphone input transformer.
The LL1545A is made with a mu-metal core and is housed in a mu-metal can.
Refer to page 2 of this sheet for termination alternatives.
Turns ratio:
1+1+1+1:2+2
Dims: (Length x Width x Height above PCB (mm))
37 x 22.5 x 14.5
Pin Layout (viewed from component side) and Windings Schematics:
8
16
7
15
6
14
5 LL1545A ₁₃
4
(top view)
3
11
2
10
1
9
1
2
9
3
10
4
11
8
14
7
16
6
15
5
Can + Core 13
Spacing between pins:
Spacing between rows of pins:
Weight:
Rec. PCB hole diameter:
Static resistance of each primary (average):
Static resistance of each secondary (average):
Self resonance point:
Recommended load for best square-wave response
(Termination alternative A below):
Frequency response
(source 600Ω , load (6.7 kΩ + 470 pF) in parallel with 56 kΩ ):
Loss across transformer (at midband with termination as above):
Core:
Isolation between windings / between windings and shields:
2.54 mm (0.1")
22.86 mm (0.9")
46 g
1.5 mm
147 Ω
295 Ω
> 220 kHz
6.7 kΩ + 470 pF
10 Hz - 70 kHz +/- 0.5 dB @ 0 dBU
0.3 dB
Mu-metal
3 kV / 1.5 kV
Data at different termination alternatives, showed on page 2 of this data sheet.
Termination Turns Copper Resistance Idle impedance Suggested Use THD < 0.2%@40 Hz
Alternative ratio prim/sec
@40 Hz, 0dBU
primary level /
real source impedance
A
1:1 590 Ω / 590 Ω
80 kΩ / 80 kΩ 10 kΩ / 10 kΩ 22 dBU / 600 Ω
B
1:1 147 Ω / 147 Ω
20 kΩ / 20 kΩ 600 Ω / 600 Ω 16 dBU / 150 Ω
C
1:2 147 Ω / 590 Ω
20 kΩ / 80 kΩ 600 Ω / 2.5 kΩ 16 dbU / 150 Ω
D
1:2 37 Ω / 147 Ω
5 kΩ / 20 kΩ 200 Ω / 1 kΩ 10 dBU / 37.5 Ω
E
1:4 37 Ω / 590 Ω
5 kΩ / 80 kΩ 200 Ω / 3.2 kΩ 10 dBU / 37.5 Ω
F (Split) 2:1+1 590 Ω / 295 Ω + 295 Ω
G (Split)
1:1+1 _{147 Ω / 295 Ω + 295 Ω Left side can also be connected as BCenterTap (1:1+1)}
or D (1:2+2)
LL1545A , page 1
R000113