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MAX3271 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3271 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 8 page Optical Linear Range The MAX3271 has high gain, which limits the output when the input signal exceeds 40µAp-p. The MAX3271 operates in a linear range for inputs not exceeding: Layout Considerations Noise performance and bandwidth will be adversely affected by capacitance at the IN pin. Minimize capaci- tance on this pin and select a low-capacitance photodi- ode. Assembling the MAX3271 in die form using chip and wire technology provides the best possible perform- ance. Figure 5 shows a suggested layout for a TO header. Photodiode Filter Supply voltage noise at the cathode of the photodiode produces a current I = CPD ∆V/∆t, which reduces the receiver sensitivity (CPD is the photodiode capaci- tance.) The filter resistor of the MAX3271, combined with an external capacitor, can be used to reduce this noise (see the Typical Application Circuit). Current gen- erated by supply noise voltage is divided between CFILTER and CPD. The input noise current due to supply noise is (assuming the filter capacitor is much larger than the photodiode capacitance): INOISE = (VNOISE)(CPD) / (RFILTER)(CFILTER) If the amount of tolerable noise is known, the filter capacitor can be easily selected: CFILTER = (VNOISE)(CPD) / (RFILTER)(INOISE) For example, with maximum noise voltage = 100mVp-p, CPD = 0.85pF, RFILTER = 750 Ω, and INOISE selected to be 250nA (1/2 of the MAX3271’s input noise): CFILTER = (100mV)(0.85pF) / (750 Ω)(250nA) = 450pF Wire Bonding For high-current density and reliable operation, the MAX3271 uses gold metalization. Connections to the die should be made with gold wire only, using ball- bonding techniques. Wedge bonding is not recom- mended. Die thickness is typically 15mils (0.375mm). Linear Range Ar r dBm e e = + () () − 10 40 1 21 1000 log µ ρ +3.3V, 2.5Gbps Low-Power Transimpedance Amplifier _______________________________________________________________________________________ 7 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 = 2PAVG (re - 1) / (re + 1) Table 1. Optical Power Relations CASE IS GROUND TOP VIEW OF TO-56 HEADER CFILTER VCC PHOTODIODE MAX3271 OUT+ OUT- Figure 5. Suggested Layout for TO-56 Header |
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