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MAX3657D Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX3657D Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 15 page 155Mbps Low-Noise Transimpedance Amplifier 6 _______________________________________________________________________________________ Detailed Description The MAX3657 transimpedance amplifier is designed for 155Mbps fiber-optic applications. The functional dia- gram of the MAX3657 comprises a transimpedance amplifier, a voltage amplifier, a DC-cancellation circuit, and a CML output buffer. Transimpedance Amplifier The signal current at the input flows into the summing node of a high-gain amplifier. Shunt feedback through resistor RF converts this current into a voltage. Schottky diodes clamp the output signal for large input currents (Figure 1). Voltage Amplifier The voltage amplifier provides additional gain and con- verts the transimpedance amplifier single-ended output signal into a differential signal. Output Buffer The output buffer provides a reverse-terminated volt- age output and is designed to drive a 200Ω differential load between OUT+ and OUT-. For optimum supply- noise rejection, the MAX3657 should be terminated with a differential load. The MAX3657 single-ended outputs do not drive a DC-coupled grounded load. The outputs should be AC-coupled or terminated to VCC. If a single- ended output is required, both the used and the unused outputs should be terminated in a similar manner. DC-Cancellation Circuit The DC-cancellation circuit uses low-frequency feed- back to remove the DC component of the input signal (Figure 2). This feature centers the input signal within the transimpedance amplifier’s linear range, thereby reducing pulse-width distortion. The DC-cancellation circuit is internally compensated and does not require external capacitors. This circuit minimizes pulse-width distortion for data sequences that exhibit a 50% mark density. A mark density signifi- cantly different from 50% causes the MAX3657 to gen- erate pulse-width distortion. Grounding the FILT pin disables the DC-cancellation circuit. For normal opera- tion, the DC-cancellation circuit must be enabled. The 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. However, amplifier noise increases for signals with significant DC component (see the Typical Operating Characteristics). VOLTAGE AMPLIFIER OUTPUT BUFFER OUT+ ROUT ROUT OUT- RF VCCZ MON LOWPASS FILTER ROUT FILT IN DC-CANCELLATION CIRCUIT TRANSIMPEDANCE AMPLIFIER ENABLE +1.0V MAX3657 Functional Diagram |
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