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Tibeliusgatan 7 International Domestic S-761 50 NORRTALJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176-13935 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 Pin layout (viewed from component side) and winding schematics: 1 4 8 3 2 6 LL 1538 2 (top view) 6 4 5 1 5 3 8 LL1538 LL1538XL Dimensions (Max. Length x Width x Height above 38 x 24 x 17 38 x 24 x 20.5 PCB (mm)) 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 44W 61W Static resistance of each secondary 880 W 975 W Distortion (primaries connected in parallel, 0.2 % @ 0 dBU (0.775V 0.2 % @ + 3 dBU (1.1V source impedance 200W ) rms) primary level, 50 Hz rms) primary level, 50 Hz 1 % @ + 10 dBU (2.5 V 1 % @ + 13 dBU (3.5V rms) rms) primary level, 50 Hz primary level, 50 Hz Self resonance point > 120 kHz > 120 kHz Optimum termination for best square-wave No termination necessary No termination necessary response (Connection 1:5, source imp. 200W ) Frequency response (source 200 W, no termination) 10 Hz - 100 kHz +/- 0.3 dB 10 Hz - 80 kHz +/- 0.3 dB Isolation between windings/ between windings and 4 kV / 2 kV 4 kV / 2 kV shield Connection alternatives 4 8 4 8 3 3 2 6 2 6 1 5 1 5 1 : 2.5 1 : 5 R980616