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AD827JR-REEL Scheda tecnica(PDF) 7 Page - Analog Devices |
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AD827JR-REEL Scheda tecnica(HTML) 7 Page - Analog Devices |
7 / 12 page AD827 REV. C –7– VIDEO LINE DRIVER The AD827 functions very well as a low cost, high speed line driver for either terminated or unterminated cables. Figure 23 shows the AD827 driving a doubly terminated cable in a follower configuration. 0.1 µF 0.1 µF 50 Ω AD827 1/2 RBT CC +VS VIN VOUT –VS RT 500 Ω 50 Ω 50 Ω 500 Ω Figure 23. A Video Line Driver The termination resistor, RT, (when equal to the cable’s characteristic impedance) minimizes reflections from the far end of the cable. While operating from ±5 V supplies, the AD827 maintains a typical slew rate of 200 V/ µs, which means it can drive a ±1 V, 30 MHz signal into a terminated cable. Table I. Video Line Driver Performance Summary 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 ±50 pF 11 MHz 0% *–3 dB bandwidth numbers are for the 0 dBm signal input. Overshoot numbers are the percent overshoot of the 1 V step input. A back-termination resistor (RBT, also equal to the characteristic impedance of the cable) may be placed between the AD827 output 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, although this requires that the op amp supply ±2 V to the output in order to achieve a ±1 V swing at resistor RT. A HIGH SPEED THREE OP AMP INSTRUMENTATION AMPLIFIER CIRCUIT The instrumentation amplifier circuit shown in Figure 24 can provide a range of gains. Table II details performance. – + + – + – 1 3 2 2 3 6 7 6 5 AD847 AD827 AD827 0.1 µF 1k Ω 2k Ω 2k Ω 1k Ω 2k Ω 0.1 µF 0.1 µF 2k Ω R L 2 – 8pF 0.1 µF R G 4 7 2k Ω 8 4 TRIM FOR BEST SETTLING TIME 1/2 1/2 3pF CIRCUIT GAIN = + 1 G R 2000 TRIM FOR OPTIMUM BANDWIDTH 7 – 15 pF NOTE: PINOUT SHOWN IS FOR MINIDIP PACKAGE –V IN +VS –V S +V IN +V S –V S VOUT Figure 24. A High Bandwidth Three Op Amp Instrumentation Amplifier Table II. Performance Specifications for the Three Op Amp Instrumentation Amplifier Small Signal Bandwidth Gain RG @ 1 V p-p Output 1 Open 16.1 MHz 22 k 14.7 MHz 10 226 Ω 4.9 MHz 100 20 Ω 660 kHz |
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