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MAX3275 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX3275 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 9 page Output Buffer The output buffer provides a reverse-terminated voltage output. The buffer is designed to drive a 100 Ω differen- tial load between OUT+ and OUT-. The output current is divided between internal 50 Ω resistors and the exter- nal load resistor. For optimum supply-noise rejection, the MAX3275/ MAX3277 should be terminated with a differential load. If a single-ended output is required, the unused output should be terminated in a similar manner. The MAX3275/MAX3277 will not drive a DC-coupled, 50 Ω grounded load; however, it will drive a compatible 50 Ω CML input. DC Cancellation Circuit The direct-current (DC) cancellation circuit uses low- frequency feedback to remove the DC component of the input signal (Figure 3). This feature centers the input signal within the transimpedance amplifier’s linear range, thereby reducing pulse-width distortion caused by large input signals. Pulse-width distortion in small signals will not be corrected. The DC cancellation circuit is internally compensated and therefore does not require external capacitors. This circuit minimizes pulse-width distortion for data sequences that exhibit a 50% mark density and 8b/10b coding. A mark density significantly different from 50% will cause the MAX3275/MAX3277 to generate pulse- width distortion. DC cancellation current is drawn from the input and creates noise. For low-level signals with little or no DC component, the added noise is insignificant. Applications Information Optical Power Relations Many of the MAX3275/MAX3277 specifications relate to the input signal amplitude. When working with optical receivers, the input is sometimes expressed in terms of average optical power and extinction ratio. Figure 4 and Table 1 show relations that are helpful for converting optical power to input signal when designing with the MAX3275/MAX3277. (Refer to Application note HFAN–3.0.0 Accurately Estimating Optical Receiver Sensitivity.) Optical Sensitivity Calculation The input-referred RMS noise current (IN) of the MAX3275/MAX3277 generally determines the receiver Low-Noise, Fibre Channel Transimpedance Amplifiers 6 _______________________________________________________________________________________ AMPLITUDE OUTPUT (LARGE SIGNALS) TIME OUTPUT (SMALL SIGNALS) Figure 2. MAX3275/MAX3277 Limited Output AMPLITUDE INPUT FROM PHOTODIODE TIME INPUT (AFTER DC CANCELLATION) Figure 3. DC Cancellation Effect on Input Table 1. Optical Power Relations PARAMETER SYMBOL RELATION Average Power PAVG PAVG = (P0 + P1)/2 Extinction Ratio re re = P1/P0 Optical Power of a 1 P1 P1 = 2PAVG(re)/(re + 1) Optical Power of a 0 P0 P0 = 2PAVG/(re + 1) Signal Amplitude PIN PIN = P1 - P0 PIN = 2PAVG(re - 1)/(re + 1) P0 P1 PAVG TIME Figure 4. Optical Power Relations |
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