MAX4278EPA中文资料(12)

330MHz, Gain of +1/Gain of +2 Closed-Loop BuffersMAX4178/MAX4278

Flash ADC Preamp

The MAX4178/MAX4278’s high current-drive capabilitymakes them well suited for buffering the low-imped-ance input of a high-speed flash ADC. With their lowoutput impedance, these buffers can drive the inputs ofthe ADC with no loss of accuracy. Figure 4 shows apreamp for digitizing video, using the 250MspsMAX100 and the 500Msps MAX101 flash ADCs. Both ofthese ADCs have a 50 input resistance and a 1.2GHzinput bandwidth.

High-Performance

Video Distribution Amplifier

The MAX4278 (AV= +2) makes an excellent driver formultiple back-terminated 75 video coaxial cables(Figure 5). The high current-output capability allows theattachment of up to six ±2Vp-p, 150 loads to theMAX4278 at +25°C. With the output limited to ±1Vp-p,the number of loads may double. For multiple gain-of-2video line drivers in a single package, see theMAX496/MAX497data sheet.

_Ordering Information (continued)

Figure 4. Preamp for Video Digitizer

___________________Chip Information

TRANSISTOR COUNT: 175SUBSTRATE CONNECTED TO VEE

Figure 5. High-Performance Video Distribution Amplifier10

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330MHz, Gain of +1/Gain of +2

Closed-Loop Buffers

________________________________________________________Package Information

MAX4178/MAX4278

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