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5962-8964401PA Datasheet(PDF) 11 Page - Analog Devices |
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5962-8964401PA Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page Video Cable Driver Using ±5 Volt Supplies The AD844 can be used to drive low impedance cables. Using ±5 V supplies, a 100 Ω load can be driven to ±2.5 V with low distortion. Figure 35a shows an illustrative application which provides a noninverting gain of 2, allowing the cable to be reverse-terminated while delivering an overall gain of +1 to the Figure 35a. The AD844 as a Cable Driver Figure 35c. Differential Phase for the Circuit of Figure 35a load. The –3 dB bandwidth of this circuit is typically 30 MHz. Figure 35b shows a differential gain and phase test setup. In video applications, differential-phase and differential-gain characteristics are often important. Figure 35c shows the varia- tion in phase as the load voltage varies. Figure 35d shows the gain variation. Figure 35b. Differential Gain/Phase Test Setup Figure 35d. Differential Gain for the Circuit of Figure 35a Applications–AD844 REV. C –11– High Speed DAC Buffer The AD844 performs very well in applications requiring current-to-voltage conversion. Figure 36 shows connections for use with the AD568 current output DAC. In this application the bipolar offset is used so that the full-scale current is ± 5.12 mA, which generates an output of ±5.12 V using the 1 k Ω application resistor on the AD568. Figure 37 shows the full-scale transient response. Care is needed in power supply Figure 36. High Speed DAC Amplifier decoupling and grounding techniques to achieve the full 12-bit accuracy and realize the fast settling capabilities of the system. The unmarked capacitors in this figure are 0.1 µF ceramic (for example, AVX Type SR305C104KAA), and the ferrite induc- tors should be about 2.5 µH (for example, Fair-Rite Type 2743002122). The AD568 data sheet should be consulted for more complete details about its use. Figure 37. DAC Amplifier Full-Scale Transient Response |
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