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 whicle 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 dielectically 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 MOhm) into a 500 Ohm 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.
