250 MHz, General Purpose Voltage Feedback Op Amps AD8047/AD8048 FEATURES FUNCTIONAL BLOCK DIAGRAM Wide Bandwidth AD8047, G = +1 AD8048, G = +2 8-Pin Plastic PDIP (N) Small Signal 250 MHz 260 MHz and SOIC (R) Packages Large Signal (2 V p-p) 130 MHz 160 MHz 5.8 mA Typical Supply Current AD8047/ NC 1 8 NC Low Distortion, (SFDR) Low Noise AD8048 66 dBc Typ 5 MHz 2 7 +V INPUT S 54 dBc Typ 20 MHz +INPUT 3 6 OUTPUT 5.2 nV/Hz (AD8047), 3.8 nV/Hz (AD8048) Noise Drives 50 pF Capacitive Load V 4 5 (TOP VIEW) NC S High Speed NC = NO CONNECT Slew Rate 750 V/ s (AD8047), 1000 V/ s (AD8048) Settling 30 ns to 0.01%, 2 V Step 3 V to 6 V Supply Operation APPLICATIONS Low Power ADC Input Driver The AD8047 and AD8048s low distortion and cap load drive Differential Amplifiers make the AD8047/AD8048 ideal for buffering high speed ADCs. IF/RF Amplifiers They are suitable for 12-bit/10 MSPS or 8-bit/60 MSPS ADCs. Pulse Amplifiers Additionally, the balanced high impedance inputs of the voltage Professional Video feedback architecture allow maximum flexibility when designing DAC Current to Voltage Conversion active filters. Baseband and Video Communications Pin Diode Receivers The AD8047 and AD8048 are offered in industrial (40C to Active Filters/Integrators +85C) temperature ranges and are available in 8-lead PDIP and SOIC packages. PRODUCT DESCRIPTION The AD8047 and AD8048 are very high speed and wide band- width amplifiers. The AD8047 is unity gain stable. The AD8048 is stable at gains of two or greater. The AD8047 and AD8048, which utilize a voltage feedback architecture, meet the require- ments of many applications that previously depended on current feedback amplifiers. A proprietary circuit has produced an amplifier that combines many of the best characteristics of both current feedback and voltage feedback amplifiers. For the power (6.6 mA max), the AD8047 and AD8048 exhibit fast and accurate pulse response (30 ns to 0.01%) as well as extremely wide small signal and large 1V 5ns signal bandwidth and low distortion. The AD8047 achieves 54 dBc distortion at 20 MHz, 250 MHz small signal, and Figure 1. AD8047 Large Signal Transient Response, 130 MHz large signal bandwidths. V = 4 V p-p, G = +1 O REV. A 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 that One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. may result from its use. No license is granted by implication or otherwise Tel: 781/329-4700 www.analog.com under any patent or patent rights of Analog Devices. Trademarks and Fax: 781/326-8703 2003 Analog Devices, Inc. All rights reserved. registered trademarks are the property of their respective companies.AD8047/AD8048SPECIFICATIONS ELECTRICAL CHARACTERISTICS ( V = 5 V, R = 100 , A = 1 (AD8047), A = 2 (AD8048), unless otherwise noted.) S LOAD V V AD8047A AD8048A Parameter Conditions Min Typ Max Min Typ Max Unit DYNAMIC PERFORMANCE Bandwidth (3 dB) Small Signal V 0.4 V p-p 170 250 180 260 MHz OUT 1 Large Signal V = 2 V p-p 100 130 135 160 MHz OUT Bandwidth for 0.1 dB Flatness V = 300 mV p-p OUT AD8047, R =0 F AD8048, R = 200 35 50 MHz F Slew Rate, Average +/ V = 4 V Step 475 750 740 1000 V/s OUT Rise/Fall Time V = 0.5 V Step 1.1 1.2 ns OUT V = 4 V Step 4.3 3.2 ns OUT Settling Time To 0.1% V = 2 V Step 13 13 ns OUT To 0.01% V = 2 V Step 30 30 ns OUT HARMONIC/NOISE PERFORMANCE Second Harmonic Distortion 2 V p-p 20 MHz 54 48 dBc R = 1 k 64 60 dBc L Third Harmonic Distortion 2 V p-p 20 MHz 60 56 dBc R = 1 k 61 65 dBc L Input Voltage Noise f = 100 kHz 5.2 3.8 nV/Hz Input Current Noise f = 100 kHz 1.0 1.0 pA/Hz Average Equivalent Integrated Input Noise Voltage 0.1 MHz to 10 MHz 16 11 V rms Differential Gain Error (3.58 MHz) R = 150 , G = +2 0.02 0.01 % L Differential Phase Error (3.58 MHz) R = 150 , G = +2 0.03 0.02 Degree L 2 DC PERFORMANCE , R = 150 L 3 Input Offset Voltage 13 13 mV T to T 44mV MIN MAX Offset Voltage Drift 5 5 V/C Input Bias Current 1 3.5 1 3.5 A T to T 6.5 6.5 A MIN MAX Input Offset Current 0.5 2 0.5 2 A T to T 33 A MIN MAX Common-Mode Rejection Ratio V = 2.5 V 74 80 74 80 dB CM Open-Loop Gain V = 2.5 V 58 62 65 68 dB OUT T to T 54 56 dB MIN MAX INPUT CHARACTERISTICS Input Resistance 500 500 k Input Capacitance 1.5 1.5 pF Input Common-Mode Voltage Range 3.4 3.4 V OUTPUT CHARACTERISTICS Output Voltage Range, R = 150 2.8 3.0 2.8 3.0 V L Output Current 50 50 mA Output Resistance 0.2 0.2 Short-Circuit Current 130 130 mA POWER SUPPLY Operating Range 3.0 5.0 6.0 3.0 5.0 6.0 V Quiescent Current 5.8 6.6 5.9 6.6 mA T to T 7.5 7.5 mA MIN MAX Power Supply Rejection Ratio 72 78 72 78 dB NOTES 1 See Absolute Maximum Ratings and Theory of Operation sections. 2 Measured at A = 50. V 3 Measured with respect to the inverting input. Specifications subject to change without notice. 2 REV. A