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AD847JR Datasheet(PDF) 10 Page - Analog Devices |
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AD847JR Datasheet(HTML) 10 Page - Analog Devices |
10 / 12 page AD847 REV. F –10– VIDEO LINE DRIVER The AD847 functions very well as a low cost, high speed line driver for either terminated or unterminated cables. Figure 23 shows the AD847 driving a doubly terminated cable in a fol- lower configuration. The termination resistor, RT, (when equal to the cable’s charac- teristic impedance) minimizes reflections from the far end of the cable. While operating from ±5 V supplies, the AD847 main- tains a typical slew rate of 200 V/ µs, which means it can drive a ±1 V, 30 MHz signal into a terminated cable. 0.1 µF 0.1 µF 500 Ω 500 Ω 75 Ω AD847 75 Ω 75 Ω R T RBT C C SEE TABLE I +VS V IN VOUT –V S IN R 100 Ω 75 Ω COAX 75 Ω COAX Figure 23. Video Line Driver Table I. Video Line Driver Performance Chart Over- VIN*VSUPPLY CC –3 dB BW shoot 0 dB or ±500 mV Step ±15 20 pF 23 MHz 4% 0 dB or ±500 mV Step ±15 15 pF 21 MHz 0% 0 dB or ±500 mV Step ±15 0 pF 13 MHz 0% 0 dB or ±500 mV Step ±5 20 pF 18 MHz 2% 0 dB or ±500 mV Step ±5 15 pF 16 MHz 0% 0 dB or ±500 mV Step ±5 0 pF 11 MHz 0% *–3 dB bandwidth numbers are for the 0 dBm signal input. Overshoot numbers are the percent overshoot of the 1 volt step input. A back-termination resistor (RBT, also equal to the characteristic impedance of the cable) may be placed between the AD847 out- put and the cable input, in order to damp any reflected signals caused by a mismatch between RT and the cable’s characteristic impedance. This will result in a flatter frequency response, al- though this requires that the op amp supply ±2 V to the output in order to achieve a ±1 V swing at resistor R T. Figure 24 shows the AD847 driving 100 pF and 1000 pF loads. Figure 24. AD847 Driving Capacitive Loads FLASH ADC INPUT BUFFER The 35 MHz unity gain bandwidth of the AD847 makes it an excellent choice for buffering the input of high speed flash A/D converters, such as the AD9048. Figure 25 shows the AD847 as a unity inverter for the input to the AD9048. AD9048 50 Ω 1.5k Ω 10k Ω 2k 0.1 0.1 100 27 2N3906 AD741 5 0.1 µF RB RT VIN VCC AD847 1.5k Ω V EE ANALOG INPUT (0V TO +2V) TTL CONVERT SIGNAL 0.1 µF 0.1 µF –5.2V +5.0V CONVERT D1 (MSB) D8 (LSB) –5.2V 43 Ω 1k 1k AD589 Figure 25. Flash ADC Input Buffer |
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