Precision, 16 MHz a CBFET Op Amp AD845 FEATURES CONNECTION DIAGRAMS Replaces Hybrid Amplifiers in Many Applications 16-Lead SOIC Plastic Mini-DIP (N) Package 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 mV Max Input Offset Voltage 5 V/ C Max Offset Voltage Drift 0.5 nA Input Bias Current 250 V/mV Min Open-Loop Gain 4 V p-p Max Voltage Noise, 0.1 Hz to 10 Hz 94 dB 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 70C temperature range. AD845A and AD845B trimming technology enables the very low input offset voltage devices are specified for operation over the 40C to +85C and offset voltage drift performance to be realized. This preci- industrial temperature range. The AD845S is specified to oper- sion, when coupled with a slew rate of 100 V/ms, a stable unity ate over the full military temperature range of 55C 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 pF 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 BiFET 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 mV 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 dB 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 pF/500 W loads. speed op amp. This, together with a minimum open-loop gain of 250 V/mV ensures that 12-bit performance is achieved, even in unity gain buffer circuits. REV. E 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 owners.( 25 C and 15 V dc, unless otherwise noted.) AD845SPECIFICATIONS AD845J/A AD845K/B AD845S Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Unit 1 INPUT OFFSET VOLTAGE Initial Offset 0.7 1.5 0.1 0.25 0.25 1.0 mV T to T 2.5 0.4 2.0 mV MIN MAX Offset Drift 20 1.5 5.0 10 mV/ C 2 INPUT BIAS CURRENT Initial V = 0 V 0.75 2 0.5 1 0.75 2 nA CM T to T 45/75 18/38 500 nA MIN MAX INPUT OFFSET CURRENT Initial V = 0 V 25 300 15 100 25 300 pA CM T to T 3/6.5 1.2/2.6 20 nA MIN MAX INPUT CHARACTERISTICS 11 11 11 Input Resistance 10 10 10 kW Input Capacitance 4.0 4.0 4.0 pF INPUT VOLTAGE RANGE Differential 20 20 20 V Common-Mode 10 +10.5/13 10 +10.5/13 10 +10.5/13 V Common-Mode Rejection V = 10 V 86 110 94 113 86 110 dB CM INPUT VOLTAGE NOISE 0.1 Hz to 10 Hz 4 4 4 mV p-p f = 10 Hz 80 80 80 nV/Hz f = 100 Hz 60 60 60 nV/Hz f = 1 kHz 25 25 25 nV/Hz f = 10 kHz 18 18 18 nV/Hz f = 100 kHz 12 12 12 nV/Hz INPUT CURRENT NOISE f = 1 kHz 0.1 0.1 0.1 pA/Hz OPEN-LOOP GAIN V = 10 V O R 2 kW 200 500 250 500 200 500 V/mV LOAD R 500 W 100 250 125 250 100 250 V/mV LOAD T T 70 75 50 V/mV MIN MAX OUTPUT CHARACTERISTICS Voltage R 500 W 12.5 12.5 12.5 V LOAD Current Short Circuit 50 50 50 mA Output Resistance Open Loop 5 5 5 W FREQUENCY RESPONSE Small Signal Unity Gain 12.8 16 13.6 16 13.6 16 MHz 3 Full Power Bandwidth V = 10 V O R = 500 W 1.75 1.75 1.75 MHz LOAD Rise Time 20 20 20 ns Overshoot 20 20 20 % Slew Rate 80 100 94 100 94 100 V/ms Settling Time 10 V Step C = 100 pF LOAD = 500 W R LOAD to 0.01% 350 350 500 350 500 ns to 0.1% 250 250 250 ns DIFFERENTIAL GAIN f = 4.4 MHz 0.04 0.04 0.04 % DIFFERENTIAL PHASE f = 4.4 MHz 0.02 0.02 0.02 Degree POWER SUPPLY Rated Performance 15 15 15 V Operating Range 4.75 18 4.75 18 4.75 18 V Rejection Ratio V = 5 to 15 V 88 110 95 113 88 110 dB S Quiescent Current T to T 10 12 10 12 10 12 mA MIN MAX NOTES 1 Input offset voltage specifications are guaranteed after five minutes of operation at T = 25 C. A 2 Bias current specifications are guaranteed maximum at either input after five minutes of operation at T = 25 C. A 3 FPBW = slew rate/2 p V peak. 4 S grade T T are tested with automatic test equipment at T = 55 C and T = +125 C. MIN MAX A A All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units at final electrical test. Results from these tests are used to calculate outgoing quality levels. Specifications subject to change without notice. 2 REV. E