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The A56-105 is a high speed VCSEL driver IC designed for directly modulated VCSELs in fiber optic transmission systems. The VCSEL driver IC is designed to directly modulate common-cathode VCSEL. The IC has differential input (Vin+, Vin-) and single-ended output to the VCSEL anode. A ground for the VCSEL common cathode is also provided by the IC. It is operated with a single 3.3 V supply typically dissipating less than 105 mW of DC power when no load (VCSEL) is connected at the output. The driver is also equipped with various analog control pins (Vxing, Vmod, Vbias). The zero-crossing can be adjusted with the Vxing pin. The VCSEL modulation current is controlled by varying the bias current swing with the Vmod, and the VCSEL bias current is controlled by Vbias pin.
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