Datasheet AD8047, AD8048 (Analog Devices)

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/ Low Distortion, (SFDR) Low Noise NC 1 8 NC AD8048 –66 dBc Typ @ 5 MHz –INPUT 2 7 +VS –54 dBc Typ @ 20 MHz 5.2 nV/
√
Hz (AD8047), 3.8 nV/
√
Hz (AD8048) Noise +INPUT 3 6 OUTPUT Drives 50 pF Capacitive Load –V 4 (TOP VIEW) 5 NC S High Speed Slew Rate 750 V/ s (AD8047), 1000 V/ s (AD8048) NC = NO CONNECT Settling 30 ns to 0.01%, 2 V Step 3 V to 6 V Supply Operation APPLICATIONS Low Power ADC Input Driver Differential Amplifiers
The AD8047 and AD8048’s low distortion and cap load drive
IF/RF Amplifiers
make the AD8047/AD8048 ideal for buffering high speed ADCs.
Pulse Amplifiers
They are suitable for 12-bit/10 MSPS or 8-bit/60 MSPS ADCs.
Professional Video
Additionally, the balanced high impedance inputs of the voltage
DAC Current to Voltage Conversion
feedback architecture allow maximum flexibility when designing
Baseband and Video Communications
active filters.
Pin Diode Receivers
The AD8047 and AD8048 are offered in industrial (–40°C to
Active Filters/Integrators
+85°C) 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. VO = 4 V p-p, G = +1 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 may result from its use. No license is granted by implication or otherwise
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM PRODUCT DESCRIPTION SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS METALLIZATION PHOTOS MAXIMUM POWER DISSIPATION ORDERING GUIDE Typical Performance Characteristics THEORY OF OPERATION General Feedback Resistor Choice Pulse Response Large Signal Performance Power Supply Bypassing Driving Capacitive Loads APPLICATIONS Operation as a Video Line Driver Active Filters A/D Converter Driver Layout Considerations OUTLINE DIMENSIONS Revision History