LL1538XL
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Microphone Input Transformers LL1538 and LL1538XL
The LL1538 and the LL1538XL are high performance microphone input transformers, each with a high permeability mu-metal core and two three-section coils.
In the LL1538XL the core is about 45% larger than in the LL1538, resulting in a larger level capability. In both types, primary and secondary windings are separated by electrostatic shields. The three-section winding structure of the transformers results in a very low leakage inductance and thus an excellent frequency response. The transformers are encapsulated in mu-metal cases for magnetic shielding.
Turns ratio: 1 + 1 : 5
LL1538 | LL1538XL | |
Dimensions (Max. L x W x H above PCB(mm)): | 38 x 24 x 17 | 38 x 24 x 20.5 |
Spacing between pins | 5.08 mm (0.2") | 5.08 mm (0.2") |
Spacing between rows of pins | 27.94 mm (1.1") | 27.94 mm (1.1") |
Weight: | 46 g | 65 g |
Rec. PCB hole diameter | 1.5 mm | 1.5 mm |
Static resistance of each primary: | 44 ? | 61 ? |
Static resistance of each secondary: | 880 ? | 975 ? |
Distortion (primaries connected in parallel, source impedance 200?) | 0.2 % @ 0 dBU (0.775V rms) primary level, 50 Hz | 0.2 % @ + 3 dBU (1.1V rms) primary level, 50 Hz |
Self resonance point: | > 120 kHz | > 120 kHz |
Optimum termination for best square-wave response (Connection 1:5, source imp. 200? ) | No termination necessary | No termination necessary |
Frequency response (source 200 ?, no termination) | 10 Hz - 100 kHz +/- 0.3 dB | 10 Hz - 80 kHz +/- 0.3 dB |
Isolation between windings/ between windings and shield | 4 kV / 2 kV | 4 kV / 2 kV |
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