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MAX9691EPA Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX9691EPA Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page Single/Dual, Ultra-Fast, ECL-Output Comparators with Latch Enable 6 _______________________________________________________________________________________ __________ Applications Information Layout Because of the MAX9691/MAX9692/MAX9693s’ large gain-bandwidth characteristic, special precautions must be taken to use them. A PC board with a ground plane is mandatory. Mount 0.01µF ceramic decoupling capacitors as close to the power-supply pins as possi- ble, and process the ECL outputs in microstrip fashion, consistent with the load termination of 50 Ω to 200Ω (for VT = -2V). For low-impedance applications, microstrip layout and terminations at the input may also be help- ful. Pay close attention to the bandwidth of the decou- pling and terminating components. Chip components can be used to minimize lead inductance. Connect GND1 and GND2 together to a solid copper ground plane for the MAX9691/MAX9692. GND1 biases the input gain stages, while GND2 biases the ECL output stage. If the LE function is not used, connect the LE pin to GND (MAX9692/MAX9693) and the complementary LE to ECL logic high level (MAX9693 only). Do not leave the inputs of an unused comparator floating for the MAX9693. Input Slew-Rate Requirements As with all high-speed comparators, the high gain- bandwidth product of these devices creates oscillation problems when the input goes through the linear region. For clean switching without oscillation or steps in the output waveform, the input must meet certain minimum slew-rate requirements. The tendency of the part to oscillate is a function of the layout and source impedance of the circuit employed. Poor layout and larger source impedance will increase the minimum slew-rate requirement. Figure 1 shows a high-speed receiver application with 50 Ω input and output termination. With this configura- tion, in which a ground plane and microstrip PC board are used, the minimum slew rate for clean output switching is 1V/µs. In many applications, adding regenerative feedback will assist the input signal through the linear region, which will lower the minimum slew-rate requirement considerably. For example, with the addition of positive feedback components, Rf = 1kΩ and Cf = 10pF, the minimum slew-rate requirement can be reduced by a factor of four. As high-speed receivers, the MAX9691/MAX9692/ MAX9693 are capable of processing signals in excess of 600MHz. Figure 2 is a 100MHz example with an input signal level of 14mVRMS. VIN -2V 50 Ω Cf Rf 50 Ω 50 Ω 50 Ω Q Q LE Figure 1. Regenerative Feedback—High-Speed Receiver with 50 Ω Input and Output Termination 0V -0.9V -1.7V OUTPUT 500mV/div INPUT 20mV/div 2ns/div Figure 2. Signal Processed at 100MHz with Input Signal Level of 14mVRMS |
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