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AD828AR-REEL7 Scheda tecnica(PDF) 11 Page - Analog Devices |
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AD828AR-REEL7 Scheda tecnica(HTML) 11 Page - Analog Devices |
11 / 12 page AD828 REV. B –11– 3 2 1 1/2 AD828 RZ AIN 1/2 AD828 510 2 3 BIN RZ 100FT RG59A/U RZ = 75 1 1/2 AD828 BOUT 5 6 7 6 5 1/2 AD828 AOUT 7 510 510 536 510 510 536 510 Full-Duplex Transmission Superior load handling capability (50 mA min/amp), high band- width, wide supply voltage range and excellent crosstalk rejection makes the AD828 an ideal choice even for the most demanding high speed transmission applications. The schematic below shows a pair of AD828s configured to drive 100 feet of coaxial cable in a full-duplex fashion. Two different NTSC video signals are simultaneously applied at AIN and BIN and are recovered at AOUT and BOUT, respectively. This situation is illustrated in Figures 43 and 44. These pictures clearly show that each input signal appears undisturbed at its output, while the unwanted signal is eliminated at either receiver. The transmitters operate as followers, while the receivers’ gain is chosen to take full advantage of the AD828’s unparalleled CMRR. (In practice this gain is adjusted slightly from its theoretical value to compensate for cable nonidealities and losses.) RZ is chosen to match the characteristic impedance of the cable employed. Finally, although a coaxial cable was used, the same topology applies unmodified to a variety of cables (such, as twisted pairs often used in telephony). 10 90 0% 100 500mV 500mV 10µs AIN BOUT Figure 43. A Transmission/B Reception Figure 42. Bidirectional Transmission CKT 10 90 0% 100 500mV 500mV 10µs BIN AOUT Figure 44. B Transmission/A Reception A High Performance Video Line Driver The buffer circuit shown in Figure 45 will drive a back- terminated 75 Ω video line to standard video levels (1 V p-p) with 0.1 dB gain flatness to 40 MHz with only 0.05 ° and 0.01% differential phase and gain at the 3.58 MHz NTSC subcarrier frequency. This level of performance, which meets the require- ments for high-definition video displays and test equipment, is achieved using only 7 mA quiescent current/amplifier. 3 2 1 1/2 AD828 8 0.1 F 4 +15V –15V RBT 75 RT 75 VIN 1k 1.0 F 0.1 F 1.0 F 1k 75 RT 75 Figure 45. Video Line Driver |
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