PDF 5962-9313101M2A Data sheet ( Hoja de datos )

Número de pieza	5962-9313101M2A
Descripción	High Performance Video Op Amp
Fabricantes	Analog Devices
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No Preview Available ! a High Performance Video Op Amp AD811 FEATURES High Speed 140 MHz Bandwidth (3 dB, G = +1) 120 MHz Bandwidth (3 dB, G = +2) 35 MHz Bandwidth (0.1 dB, G = +2) 2500 V/␮s Slew Rate 25 ns Settling Time to 0.1% (For a 2 V Step) 65 ns Settling Time to 0.01% (For a 10 V Step) Excellent Video Performance (RL =150 ⍀) 0.01% Differential Gain, 0.01؇ Differential Phase Voltage Noise of 1.9 nV√Hz Low Distortion: THD = –74 dB @ 10 MHz Excellent DC Precision 3 mV max Input Offset Voltage Flexible Operation Specified for ؎5 V and ؎15 V Operation ؎2.3 V Output Swing into a 75 ⍀ Load (VS = ؎5 V) APPLICATIONS Video Crosspoint Switchers, Multimedia Broadcast Systems HDTV Compatible Systems Video Line Drivers, Distribution Amplifiers ADC/DAC Buffers DC Restoration Circuits Medical—Ultrasound, PET, Gamma and Counter Applications PRODUCT DESCRIPTION The AD811 is a wideband current-feedback operational ampli- fier, optimized for broadcast quality video systems. The –3 dB bandwidth of 120 MHz at a gain of +2 and differential gain and phase of 0.01% and 0.01° (RL = 150 Ω) make the AD811 an excellent choice for all video systems. The AD811 is designed to meet a stringent 0.1 dB gain flatness specification to a band- width of 35 MHz (G = +2) in addition to the low differential gain and phase errors. This performance is achieved whether driving one or two back terminated 75 Ω cables, with a low power supply current of 16.5 mA. Furthermore, the AD811 is specified over a power supply range of ± 4.5 V to ± 18 V. 0.10 0.20 0.09 0.08 0.07 0.06 RF = 649⍀ FC = 3.58MHz 100 IRE MODULATED RAMP RL = 150⍀ 0.18 0.16 0.14 0.12 0.05 0.10 0.04 PHASE 0.08 0.03 0.06 0.02 GAIN 0.04 0.01 0.02 REV. D 56 7 8 9 10 11 12 13 14 15 SUPPLY VOLTAGE – ؎Volts Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. CONNECTION DIAGRAMS 8-Lead Plastic (N-8) 20-Lead LCC (E-20A) Package Cerdip (Q-8) SOIC (SO-8) Packages 3 2 1 20 19 NC 1 –IN 2 +IN 3 –VS 4 AD811 8 NC 7 +V S 6 OUTPUT 5 NC NC = NO CONNECT NC 4 NC 5 –IN 6 NC 7 +IN 8 AD811 18 NC 17 NC 16 +VS 15 NC 14 OUTPUT 9 10 11 12 13 NC = NO CONNECT 16-Lead SOIC (R-16) Package 20-Lead SOIC (R-20) Package NC 1 NC 2 –IN 3 NC 4 +IN 5 NC 6 –VS 7 NC 8 AD811 16 NC 15 NC 14 +V S 13 NC 12 OUTPUT 11 NC 10 NC 9 NC NC = NO CONNECT NC 1 NC 2 NC 3 –IN 4 NC 5 +IN 6 NC 7 –VS 8 NC 9 NC 10 AD811 20 NC 19 NC 18 NC 17 +V S 16 NC 15 OUTPUT 14 NC 13 NC 12 NC 11 NC NC = NO CONNECT The AD811 is also excellent for pulsed applications where tran- sient response is critical. It can achieve a maximum slew rate of greater than 2500 V/µs with a settling time of less than 25 ns to 0.1% on a 2 volt step and 65 ns to 0.01% on a 10 volt step. The AD811 is ideal as an ADC or DAC buffer in data acquisi- tion systems due to its low distortion up to 10 MHz and its wide unity gain bandwidth. Because the AD811 is a current feedback amplifier, this bandwidth can be maintained over a wide range of gains. The AD811 also offers low voltage and current noise of 1.9 nV/√Hz and 20 pA/√Hz, respectively, and excellent dc accu- racy for wide dynamic range applications. 12 G = +2 9 RL = 150⍀ RG = RFB VS = ؎15V 6 3 VS = ؎ 5V 0 –3 –6 1M 10 M FREQUENCY – Hz 100 M One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 1 page 250 200 VS = ؎15V 150 AD811 2.0 VS = ؎15V RL = 200⍀ VOUT = ؎10V 1.5 1.0 100 VS = ؎5V 50 –60 –40 –20 0 20 40 60 80 100 JUNCTION TEMPERATURE – ؇C 120 140 Figure 7. Short Circuit Current vs. Junction Temperature 0.5 VS = ؎5V RL = 150⍀ VOUT = ؎2.5V 0 –60 –40 –20 0 20 40 60 80 100 JUNCTION TEMPERATURE – ؇C 120 140 Figure 10. Transresistance vs. Junction Temperature 10 100 100 VS = ؎5V 1 0.1 VS = ؎15V 0.01 10k GAIN = +2 RFB = 649⍀ 100k 1M FREQUENCY – Hz 10M 100M Figure 8. Closed-Loop Output Resistance vs. Frequency NONINVERTING CURRENT VS = ؎5 TO 15V INVERTING CURRENT VS = ؎5 TO 15V 10 10 VOLTAGE NOISE VS = ؎15V VOLTAGE NOISE VS = ؎5V 11 10 100 1k 10k 100k FREQUENCY – Hz Figure 11. Input Noise vs. Frequency 10 RISE TIME 8 60 6 OVERSHOOT 4 2 VS = ؎15V VO = 1V p–p RL = 150⍀ GAIN = +2 40 20 0 0 400 600 800 1.0k 1.2k 1.4k 1.6k VALUE OF FEEDBACK RESISTOR (RFB) – ⍀ Figure 9. Rise Time and Overshoot vs. Value of Feedback Resistor, RFB 200 10 VO = 1V p–p 160 VS= ؎15V 8 RL= 150⍀ GAIN = +2 120 6 BANDWIDTH 80 4 40 PEAKING 2 0 400 600 800 1.0k 1.2k 1.4k VALUE OF FEEDBACK RESISTOR (RFB) – ⍀ 0 1.6k Figure 12. 3 dB Bandwidth and Peaking vs. Value of RFB REV. D –5– 5 Page Operation as a Video Line Driver The AD811 has been designed to offer outstanding perfor- mance at closed-loop gains of one or greater, while driving multiple reverse-terminated video loads. The lowest differential gain and phase errors will be obtained when using ± 15 volt power supplies. With ± 12 volt supplies, there will be an insig- nificant increase in these errors and a slight improvement in gain flatness. Due to power dissipation considerations, ± 12 volt supplies are recommended for optimum video performance. Excellent performance can be achieved at much lower supplies as well. The closed-loop gain vs. frequency at different supply voltages is shown in Figure 36. Figure 37 is an oscilloscope photograph of an AD811 line driver’s pulse response with ± 15 volt supplies. The differential gain and phase error vs. supply are plotted in Figures 38 and 39, respectively. Another important consideration when driving multiple cables is the high frequency isolation between the outputs of the cables. Due to its low output impedance, the AD811 achieves better than 40 dB of output to output isolation at 5 MHz driv- ing back terminated 75 Ω cables. 649⍀ 649⍀ +VS 75⍀ CABLE 75⍀ VOUT #1 75⍀ 0.1␮F VIN 75⍀ CABLE AD811 75⍀ 0.1␮F 75⍀ CABLE 75⍀ VOUT #2 75⍀ –VS Figure 35. A Video Line Driver Operating at a Gain of +2 12 G = +2 9 RL = 150⍀ RG = RFB 6 VS = ؎15V RFB = 649⍀ 3 VS = ؎5V RFB = 562⍀ 0 –3 –6 1 10 100 FREQUENCY – MHz Figure 36. Closed-Loop Gain vs. Frequency, Gain = +2 100 VIN 90 1V AD811 10ns VOUT 10 0% 1V Figure 37. Small Signal Pulse Response, Gain = +2, VS = ±15 V 0.10 0.09 RF= 649⍀ FC= 3.58MHz 0.08 100 IRE MODULATED 0.07 RAMP 0.06 0.05 0.04 0.03 0.02 a. DRIVING A SINGLE, BACK TERMINATED, 75⍀ COAX CABLE b. DRIVING TWO PARALLEL, BACK TERMINATED, COAX CABLES b 0.01 a 56 7 8 9 10 11 12 13 14 SUPPLY VOLTAGE – ؎Volts 15 Figure 38. Differential Gain Error vs. Supply Voltage for the Video Line Driver of Figure 35 0.20 0.18 0.16 0.14 RF = 649⍀ FC = 3.58MHz 100 IRE MODULATED RAMP 0.12 a. DRIVING A SINGLE, BACK TERMINATED, 75⍀ COAX CABLE 0.10 b.DRIVING TWO PARALLEL, BACK TERMINATED, COAX CABLES 0.08 b 0.06 0.04 0.02 a 5 6 7 8 9 10 11 12 13 14 15 SUPPLY VOLTAGE – ؎Volts Figure 39. Differential Phase Error vs. Supply Voltage for the Video Line Driver of Figure 35 REV. D –11– 11 Page

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