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MAX3803UBP-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX3803UBP-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page _______________Detailed Description ______and Applications Information The MAX3803 is an adaptive equalizer designed to extend the reach of transmission lines in high-frequency backplane and rack-to-rack interconnect applications. The MAX3803 automatically adjusts to attenuation caused by skin-effect and dielectric losses. Although optimized for coded and scrambled data between 2.488Gbps and 3.125Gbps, the MAX3803 provides effective compensation for rates between 1Gbps and 3.2Gbps. The MAX3803 consists of low common-mode input and output buffers, an equalizer core, a DC-offset-correction loop, and a limiting amplifier (Figure 2). Low Common-Mode Input and Output The MAX3803 permits DC-coupling to CML transmitters and receivers that require termination voltages as low as 1.1V and as high as VCC. Use the VTI and VTO pins to maintain compatible common-mode levels between the data source and load. VTI and VTO are independent and can be used to bridge two common-mode require- ments without the use of DC-blocking capacitors. See Figure 3 and Figure 4 for the equivalent input and out- put structures. Media Equalization Equalization at the input compensates for high-frequency loss encountered with FR4 stripline (edge-coupled) or 28AWG twin ax. The equalizer core is an amplifier with a self-adjusting frequency response. DC Cancellation Loop The DC cancellation loop removes the pulse-width dis- tortion caused by internal offsets. The closed-loop response creates a low-frequency cutoff of approxi- mately 15kHz, below which the offset control tracks the AC signal. This also sets the limit on the maximum time DC-Coupled, UCSP 3.125Gbps Equalizer 6 _______________________________________________________________________________________ MAX3803 CML INPUT CML OUTPUT IN+ IN- OUT+ OUT- VTI VCC VTO EQUALIZER DC CANCELLATION LOOP LIMITING AMPLIFER Figure 2. Functional Diagram 2 2 22 SIGNAL SOURCE IN OUT AB C CONNECTOR CONNECTOR ≤40in EDGE-COUPLED TRANSMISSION LINE ON FR4 OR ≤10m 28AWG TWIN AX CABLE MAX3803 Figure 1. Backplane Interconnect ESD STRUCTURES VCC +1.1V ≤ VTO ≤ VCC 50 Ω 50 Ω OUT+ OUT- Figure 4. CML Output Structure ESD STRUCTURES VCC VCC VCC +1.1V ≤ VTI ≤ VCC 50 Ω 50 Ω IN+ IN- Figure 3. CML Input Structure |
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