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MAX477MJA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX477MJA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page 300MHz High-Speed Op Amp 10 ______________________________________________________________________________________ Flash ADC Preamp The MAX477’s high output-drive capability and ability to drive capacitive loads make it well suited for buffer- ing the low-impedance input of a high-speed flash ADC. With its low output impedance, the MAX477 can drive the inputs of the ADC while maintaining accuracy. Figure 7 shows a preamp for digitizing video, using the 250Msps MAX100 and the 500Msps MAX101 flash ADCs. Both of these ADCs have a 50 Ω input resistance and a 1.2GHz input bandwidth. High-Performance Video Distribution Amplifier In a gain of +2 configuration, the MAX477 makes an excellent driver for back-terminated 75 Ω video coaxial cables (Figure 8). The high output-current drive allows the attachment of up to six ±2Vp-p, 150 Ω loads to the MAX477 at +25°C. With the output limited to ±1Vp-p, the number of loads may double. The MAX4278 is a similar amplifier configured for a gain of +2 without the need for external gain-setting resistors. For multiple gain-of-2 video line drivers in a single package, see the MAX496/MAX497 data sheet. Wide-Bandwidth Bessel Filter Two high-impedance inputs allow the MAX477 to be used in all standard active filter topologies. The filter design is straightforward because the component val- ues can be chosen independently of op amp bias. Figure 9 shows a wide-bandwidth, second-order Bessel filter using a multiple feedback topology. The compo- nent values are chosen for a gain of +2, a -3dB band- width of 10MHz, and a 28ns delay. Figure 10a shows a square-wave pulse response, and Figure 10b shows the filter’s frequency response and delay. Notice the flat delay in the passband, which is characteristic of the Bessel filter. MAX477 VOUT VIN RISO CL RL Figure 5. Capacitive-Load Driving Circuit MAX477 VIDEO IN 75 Ω 500 Ω 500 Ω 75 Ω 75 Ω 75 Ω 75 Ω 75 Ω 75 Ω 75 Ω 75 Ω OUT1 OUT2 OUTN Figure 8. High-Performance Video Distribution Amplifier MAX477 VIDEO IN 500 Ω 500 Ω FLASH ADC (MAX100/MAX101) Figure 7. Preamp for Video Digitizer Figure 6. Effect of CLOAD on Frequency Response With Isolation Resistor 1 0 -1 -2 1M 10M 100M 1G -6 -3 -4 -5 FREQUENCY (Hz) CL = 0pF RISO = 20Ω CL = 22pF CL = 47pF CL = 100pF |
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