a FEATURES AC PERFORMANCE Small Signal Bandwidth: 80 MHz (A V = –1) Slew Rate: 450 V/s Full Power Bandwidth: 6.8 MHz at 20 V p, R L = 500 ⍀ Fast Settling: for 10 V Step: 110 ns to 0.01%, 80 ns to 0.1% Differential Gain: <0.01% @ 4.4 MHz Differential Phase: <0.028؇ @ 4.4 MHz Total Harmonic Distortion (THD): 0.0005% @ 100 kHz Open-Loop Transimpedance: 200 M⍀ Input Voltage Noise: 2 nV/√Hz
450 V/s, Precision, Current-Feedback Op Amp AD846 CONNECTION DIAGRAM Plastic Mini-DIP (N) Package and Cerdip (Q) Package
DC PERFORMANCE Input Offset Voltage: 75 V max (B Grade) Input Offset Drift: 3.5 V/؇C max (B Grade) Quiescent Supply Current: 6.5 mA max APPLICATIONS High Speed DAC Buffers Multiflash ADC Error Amplifiers Flash ADC Buffers Coaxial Cable Drivers High Performance Audio Circuitry Available in Plastic Mini-DIP, Hermetic Cerdip, and Hermetic Metal Can Packages MIL-STD-883B Parts Available
The AD846 is a monolithic, very high speed operational amplifier offering high performance. Although technically classed as a current-feedback or transimpedance amplifier, it may be used in much the same way as traditional op amps while providing significant performance benefits. Employing Analog Devices’ junction isolated complementary bipolar (CB) process, the AD846 achieves true “12-bit” (0.01%) precision on critical ac and dc parameters, a level of performance unmatched by amplifiers fabricated using either the dielectrically isolated (DI) or other bipolar processes. The AD846 offers significant advantages over conventional high speed operational amplifiers. It maintains a nearly constant bandwidth and settling time to 0.01% over a wide range of closed-loop gains. This makes the AD846 ideal for amplifying the residue in multiple-pass analog-to-digital converters.
Other advantages include: low input errors and high open-loop transresistance (200 MΩ) into a 500 Ω load, ensuring true 12-bit dc accuracy for closed-loop gains from –1 to gains greater than –100. This combination of ac and dc performance makes the AD846 an excellent choice for buffering precision high speed DACs and flash ADCs. The AD846 is available in three performance grades. The AD846A and AD846B are rated over the industrial temperature range of –40°C to +85°C. The AD846S is rated over the full military temperature range of –55°C to +125°C and is available processed to MIL-STD-883B, Rev C. Extended reliability PLUS screening is available specified over the commercial temperature range. PLUS screening includes 168 hour burn-in as well as other environmental and physical tests. The AD846 is available in two types of 8-pin package: plastic mini-DIP and hermetic cerdip. “A” and “S” grade chips are also available. PRODUCT HIGHLIGHTS
1. The AD846 achieves settling times of 110 ns to 0.01% for gains of –1 to –10, with a 450 V/µs slew rate, while consuming only 5 mA of supply current. 2. For closed-loop gains of –1 to –100, the high speed performance of the AD846 is achieved without sacrificing full 12-bit dc precision. 3. The AD846 is well suited to line driver and video buffer applications where the properties of low distortion and high slew rate are required.
REV. B 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.
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