AD845KNZ

The AD845 is a fast, precise, N channel JFET input, monolithic operational amplifier. It is fabricated using complementary bipolar (CB) process. Advanced laser-wafer trimming technology enables the very low input offset voltage and offset voltage drift performance to be realized. This precision, when coupled with a slew rate of 100 V/μs, a stable unity gain bandwidth of 16 MHz, and a settling time of 350 ns to 0.01% —while driving a parallel load of 100 pF and 500 Ω— represents a combination of features unmatched by any FET input IC amplifier. The AD845 can easily be used to upgrade many existing designs that use BiFET or FET input hybrid amplifiers and, in some cases, those which use bipolar input op amps. The AD845 is ideal for use in applications such as active filters, high speed integrators, photodiode preamps, sample-and-hold amplifiers, and log amplifiers, and for buffering A/D and D/A converters. The 250 μV max input offset voltage makes offset nulling unnecessary in many applications. The common-mode rejection ratio of 110 dB over a ±10 V input voltage range represents exceptional performance for a JFET input high 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.

Applications

• active filters
• high speed integrators
• photodiode preamps
• sample-and-hold amplifiers
• log amplifiers
• buffering A/D and D/A converters

Key features

• Replaces Hybrid Amplifiers in Many Applications
• AC PERFORMANCE:
• Settles to 0.01% in 350 ns
• 100 V/μs 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 μV/°C Max Offset Voltage Drift
• 0.5 nA Input Bias Current
• 250 V/mV Min Open-Loop Gain
• 4 μV p-p Max Voltage Noise, 0.1 Hz to 70 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