ANALOG DEVICES AD845 Owner's Manual

Precision, 16 MHz CBFET Op Amp AD845 CONNECTION DIAGRAMSFEATURES

Replaces Hybrid Amplifiers in Many Applications

Plastic Mini-DIP (N) Package 16-Lead SOIC

AC PERFORMANCE: (R-16) Package

and CERDIP (Q) Package

Settles to 0.01% in 350 ns 100 V/
s Slew Rate 12.8 MHz Min Unity Gain Bandwidth 1.75 MHz Full Power Bandwidth at 20 V p-p

DC PERFORMANCE: 0.25 m V Max Input Offset Voltage 5
V/C Max Offset Voltage Drift 0.5 n A Input Bias Current 250 V/m V Min Open-Loop Gain 4
V p-p Max Voltage Noise, 0.1 Hz to 10 Hz 94 d B Min CMRR Available in Plastic Mini-DIP, Hermetic CERDIP, and SOIC Packages. Also Available in Tape and Reel in Accordance with EIA-481A Standard

GENERAL DESCRIPTION The AD845 conforms to the standard op amp pinout except The AD845 is a fast, precise, N channel JFET input, monolithic that offset nulling is to V+. The AD845J and AD845K grade operational amplifier. It is fabricated using Analog Devices’ devices are available specified to operate over the commercial complementary bipolar (CB) process. Advanced laser-wafer 0∞C to 70∞C temperature range. AD845A and AD845B trimming technology enables the very low input offset voltage devices are specified for operation over the –40∞C to +85∞C and offset voltage drift performance to be realized. This preci- www.BDTIC.co industrial temperature range. The AD845S is specified to oper- /A sion, when coupled with a slew rate of 100 V/ms, a stable unity ate over the full military temperature range of –55∞C to +125∞C. gain bandwidth of 16 MHz, and a settling time of 350 ns to Both the industrial and military versions are available in 8-lead 0.01%—while driving a parallel load of 100 p F and 500 W— CERDIP packages. The commercial version is available in an represents a combination of features unmatched by any FET 8-lead plastic mini-DIP and 16-lead SOIC; J and S grade chips input IC amplifier. The AD845 can easily be used to upgrade are also available. many existing designs that use Bi FET or FET input hybrid

amplifiers and, in some cases, those which use bipolar input PRODUCT HIGHLIGHTS op amps. 1. The high slew rate, fast settling time, and dc precision of the AD845 make it ideal for high speed applications requiring

The AD845 is ideal for use in applications such as active filters,

12-bit accuracy.

high speed integrators, photodiode preamps, sample-and-hold

amplifiers, and log amplifiers, and for buffering A/D and D/A 2. The performance of circuits using the LF400, HA2520, converters. The 250 m V max input offset voltage makes offset HA2522, HA2525, HA2620, HA2622, HA2625, 3550, nulling unnecessary in many applications. The common-mode OPA605, and LH0062 can be upgraded in most cases.

rejection ratio of 110 d B over a ±10 V input voltage range

3. The AD845 is unity gain stable and internally compensated.

represents exceptional performance for a JFET input high

4. The AD845 is specified while driving 100 p F/500 W loads.

speed op amp. This, together with a minimum open-loop gain of 250 V/m V ensures that 12-bit performance is achieved, even in unity gain buffer circuits.

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