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AD827SQ датащи(PDF) 7 Page - Analog Devices |
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AD827SQ датащи(HTML) 7 Page - Analog Devices |
7 / 8 page AD827 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. 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 ±5 0 pF 11 MHz 0% NOTE *–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 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 3 OP AMP INSTRUMENTATION AMPLIFIER CIRCUIT The instrumentation amplifier circuit shown in Figure 24 can provide a range of gains. The chart of Table II details performance. – + + – + – 1 3 2 2 3 6 7 6 5 AD847 AD827 AD827 0.1µF 1k Ω 2k Ω 2k Ω 1k Ω 2k Ω 0.1µF 0.1µF 2k Ω RL 2 – 8pF 0.1µF 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 +VIN +VS –VS V OUT 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 2 2 k 14.7 MHz 10 226 Ω 4.9 MHz 100 20 Ω 660 kHz A TWO-CHIP VOLTAGE-CONTROLLED AMPLIFIER (VCA) WITH EXPONENTIAL RESPONSE Voltage-controlled amplifiers are often used as building blocks in automatic gain control systems. Figure 25 shows a two-chip VCA built using the AD827 and the AD539, a dual, current- output multiplier. As configured, the circuit has its two 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 CONTROL W1 Z1 CH1 OUT BASE COM CH2 OUT Z2 W2 HF COMP CH 1 IN CH2 IN INPUT COM OUTPUT COM AD539 0.01µF + – AD827 5 6 2 3 + – AD827 1/2 0.1µF 0.1µF 4.7 Ω 4.7 Ω +5V –5V 1/2 +5V 0.1µF 8 1 –5V 0.1µF 2pF 2pF 4 7 VX 50 Ω 50 Ω COAX LINE RT OUTPUT INPUT RANGE: 10MV TO 3V (55dB) *PINOUT SHOWN IS FOR MINI-DIP PACKAGE * * V IN –V S +VS 8V2 V AT TERMINATION RESISTOR, R = T OUT C 3 C 4 V AT PIN & OF AD827 = OUT V X 2 IN V 4V2 V X 2 IN V Figure 25. A Wide Range Voltage-Controlled Amplifier Circuit |
Аналогичный номер детали - AD827SQ |
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Аналогичное описание - AD827SQ |
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