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MAX3724E Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3724E Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 10 page 3.2Gbps SFP Transimpedance Amplifiers with RSSI _______________________________________________________________________________________ 7 Voltage Amplifier Stage The voltage amplifier stage provides gain and converts the single-ended input to differential outputs. DC Cancellation Circuit The DC cancellation circuit uses low-frequency feed- back 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. The DC cancellation circuit is internally com- pensated and therefore does not require external capacitors. Output Buffer The output buffer provides a reverse-terminated voltage output. The buffer is designed to drive a 100Ω differential load between OUT+ and OUT-. The MAX3724 must be DC-coupled to the MAX3748A. See Figures 4 and 5. For optimum supply-noise rejection, the MAX3725 should be terminated with a matched load. If a single- ended output is required, the unused output should be terminated to a 50Ω resistor to VCC. The MAX3725 does not drive a DC-coupled, 50Ω grounded load; however, it does drive a compatible 50Ω CML input. Signal-Strength Indicator The MAX3724 produces a signal proportional to the average photodiode current. This is added to the com- mon mode of the data outputs OUT+ and OUT-. This signal is intended for use with the MAX3748A to pro- vide a ground-referenced RSSI voltage. Applications Information Signal-Strength Indicator The SFF-8472 digital diagnostic specification requires monitoring of input receive power. The MAX3748A and MAX3724 receiver chipset allows for the monitoring of the average receive power by measuring the average DC current of the photodiode. AMPLITUDE OUTPUT (LARGE SIGNALS) TIME OUTPUT (SMALL SIGNALS) AMPLITUDE INPUT FROM PHOTODIODE TIME INPUT AFTER DC CANCELLATION Figure 2. MAX3724/MAX3725 Limited Output Figure 3. DC Cancellation Effect on Input OUT+ OUT- 50Ω 50Ω VCC OUT+ OUT- 100Ω VCC Figure 4. Equivalent Output MAX3724 Figure 5. Equivalent Output MAX3725 |
Similar Part No. - MAX3724E |
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Similar Description - MAX3724E |
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