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AD828AR-REEL Datasheet(PDF) 11 Page - Analog Devices |
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AD828AR-REEL Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page REV. C AD828 –11– 3 2 1 1/2 AD828 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 RZ Figure 6. Bidirectional Transmission CKT Full-Duplex Transmission Superior load handling capability (50 mA min/amp), high bandwidth, wide supply voltage range, and excellent crosstalk rejection makes the AD828 an ideal choice for even 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 7 and 8. These pictures clearly show that each input signal appears undisturbed at its out- put, 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 7. A Transmission/B Reception 10 90 0% 100 500mV 500mV 10µs BIN AOUT Figure 8. B Transmission/A Reception A High Performance Video Line Driver The buffer circuit shown in Figure 9 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 requirements for high definition video displays and test equipment, is achieved using only 7 mA quiescent current/amplifier. 2 3 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 9. Video Line Driver |
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