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MAX3762EEP Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX3762EEP Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page __________Applications Information Converting Average Optical Power to Signal Amplitude Many of the MAX3761/MAX3762’s specifications relate to input-signal amplitude. When working with fiber optic receivers, the input is usually expressed in terms of average optical power and extinction ratio. The rela- tions given in Table 1 are helpful for converting optical power to input signal when designing with the MAX3761/MAX3762. In an optical receiver, the input voltage to the limiting amplifier can be found by multiplying the relationship in Table 1 with the photodiode responsivity (p) and tran- simpedance amplifier gain (G). Optical Hysteresis Power and hysteresis are often expressed in decibels. By definition, decibels are always 10log (power). At the inputs to the MAX3761/MAX3762 limiting amplifier, the power is VIN2/R. If a receiver’s optical input power (x) increases by a factor of two, and the preamplifier is lin- ear, then the voltage input to the MAX3761/MAX3762 also increases by a factor of two. The optical power change is 10log(2x / x) = 10log(2) = +3dB At the MAX3761/MAX3762, the voltage change is: In an optical receiver the dB change at the MAX3761/ MAX3762 will always equal 2x the optical dB change. The MAX3761/MAX3762’s typical voltage hysteresis is 3.6dB. This provides an optical hysteresis of 1.8dB. Input Sensitivity The receiver’s gain sensitivity defines the smallest signal input that results in fully limited PECL-compatible data outputs. Smaller signals result in nonlimited outputs. The MAX3761/MAX3762’s input sensitivity (SGAIN) is 4mVp-p: SGAIN = 4mV Optical gain sensitivity (in dBm) is: In a receiver with G = 6k Ω, re = 10, and ρ = 0.8A/W, gain sensitivity is 510nW, or -32.9dBm. 622Mbps ATM Component Selection As an example, a preamplifier with a 150kHz low- frequency cutoff and a 950mVp-p maximum output has the best performance with the following selections: CIN = 5.6nF, so that fC = 15kHz (one decade below the 150kHz cutoff) CAZ = 150pF, so that fOC < 1.5kHz (one decade below fC) CFILTER = 100pF, so that the integration frequency equals 3MHz. These selections should provide data-dependent jitter less than 110ps p-p when the input consists of PRBS data with no more than 72 consecutive bits. 10log S 2G x x GAIN ρ r r e e + − 1 1 1000 10 10 2 20 2 6 2 2 2 log log( ) log( ) 2V / R V/ R IN IN () == = + dB Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs _______________________________________________________________________________________ 9 Table 1. Optical-Power Relations* TIME P0 P1 PAVE Figure 4. Optical-Power Relations SYMBOL RELATION Average Power PAVE PARAMETER Extinction Ratio re Optical Power of a “1” P1 Optical Power of a “0” P0 Signal Amplitude PIN P = P0 + P1 AVE ()/2 r = 1 / P0 e P PP r r AVE e e 12 1 = + PP r AVE e 02 1 =+ () / PP P P r r IN AVE e e =− = − () + 10 2 1 1 OPTICAL POWER * Assuming a 50% average input data duty cycle (true for SONET/ATM data). |
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