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M02139 데이터시트(PDF) 8 Page - M/A-COM Technology Solutions, Inc. |
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M02139 데이터시트(HTML) 8 Page - M/A-COM Technology Solutions, Inc. |
8 / 18 page 02139-DSH-001-D Mindspeed Technologies ® 8 Mindspeed Proprietary and Confidential 3.0 Functional Description 3.1 Overview The M02139 is a 10.3 Gbps TIA with a wide input dynamic range to support different transmission distance requirements. Input overload of 2.0 mAPP is provided to support short-haul fiber optic systems. In order to satisfy such high sensitivity and good optical overload requirements, automatic gain control circuit (AGC) is implemented in the M02139. The AGC monitors the output amplitude and automatically reduces the TIA gain when the photodiode current exceeds the AGC threshold, maintaining the output at a constant level. A replica of the average photodiode current is available at the MON pad for photo-alignment and SFF-8472 Rx power monitoring. A low pass filter can be engaged by pulling IMON above 1.6 V, for 1.25 Gbps operation. Figure 3-1. M02139 Block Diagram DOUT DOUT TIA AGC Voltage Reg VREG BGAP Current Ref Gen Gain AGC Vreg MON PINA PINK Output Buffer DC Servo Rf |
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