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AD8079BR Datasheet(PDF) 8 Page - Analog Devices |
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AD8079BR Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page AD8079 REV. A –8– 8 7 6 2 1 5 4 3 VOUT #1 75 Ω 75 Ω CABLE 75 Ω VOUT #2 75 Ω 75 Ω CABLE 75 Ω 75 Ω 75 Ω CABLE VIN +VS –VS VOUT #3 75 Ω 75 Ω CABLE 75 Ω VOUT #4 75 Ω 75 Ω CABLE 75 Ω 1/2 AD8079 1/2 AD8079 4.7µF 4.7µF 0.1µF 0.1µF Figure 26. Video Line Driver Single-Ended to Differential Driver Using an AD8079 The two halves of an AD8079 can be configured to create a single-ended to differential high speed driver with a –3 dB band- width in excess of 110 MHz as shown in Figure 27. Although the individual op amps are each current feedback with internal feedback resistors, the overall architecture yields a circuit with attributes normally associated with voltage feedback amplifiers, while offering the speed advantages inherent in current feedback amplifiers. In addition, the gain of the circuit can be changed by varying a single resistor, RF, which is often not possible in a dual op amp differential driver. 50 Ω OUTPUT #1 50 Ω OUTPUT #2 RG 750 Ω RF 750Ω 1/2 AD8079 1/2 AD8079 OP AMP #1 OP AMP #2 VIN CC = 1.5pF Figure 27. Differential Line Driver VOUT RF ( INTERNAL) RN I BI I BN RI ( INTERNAL) RSERIES CL Figure 24. Output Offset Voltage Driving Capacitive Loads The AD8079 was designed primarily to drive nonreactive loads. If driving loads with a capacitive component is desired, best frequency response is obtained by the addition of a small series output resistance (RSERIES). The graph in Figure 25 shows the optimum value for RSERIES vs. capacitive load. It is worth noting that the frequency response of the circuit when driving large capacitive loads will be dominated by the passive roll-off of RSERIES and CL. CL – pF 40 30 0 025 5 10 15 20 20 10 Figure 25. Recommended RSERIES vs. Capacitive Load Operation as a Video Line Driver The AD8079 has been designed to offer outstanding perfor- mance as a video line driver. The important specifications of differential gain (0.01%) and differential phase (0.02 °) meet the most exacting HDTV demands for driving one video load with each amplifier. The AD8079 also drives four back terminated loads (two each), as shown in Figure 26, with equally impressive performance (0.01%, 0.07 °). Another important consideration is isolation between loads in a multiple load application. The AD8079 has more than 40 dB of isolation at 5 MHz when driv- ing two 75 Ω back terminated loads. |
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