AD648KR

Instrumentation, Op Amps, Buffer Amps Overview

The AD648KR is a dual precision, low power BiFET operational amplifier manufactured by Analog Devices Inc. It features a maximum quiescent current of 400 µA and a maximum input bias current of 10 pA when warmed up. The device offers a typical unity gain bandwidth of 1 MHz and a slew rate of 1.8 V/µs. Input offset voltage is guaranteed at a maximum of 1.0 mV with a drift of 10 µV/°C. It operates within a supply range of ±4.5 V to ±18 V and is rated for the commercial temperature range of 0°C to 70°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Laser-wafer trimmed for low input offset voltage and minimal drift over temperature.
• BiFET technology ensures extremely low input bias current across the full common-mode voltage range.
• Low quiescent current design minimizes self-heating effects in battery-powered applications.
• Pin-compatible with industry standard dual op amps such as LF442 and TL062.

Instrumentation, Op Amps, Buffer Amps Applications

• Battery-powered precision instrument front ends
• CMOS DAC buffers requiring high linearity
• Dual photodiode preamplifiers
• Low power instrumentation amplifiers

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify that the specific ordering suffix KR corresponds to the SOIC package and commercial temperature grade (0°C to 70°C) as defined in the official specifications. Confirm that procurement channels provide genuine components from Analog Devices Inc. or authorized distributors to ensure adherence to the published electrical limits and reliability standards.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component for designs requiring high DC precision combined with low power consumption. The AD648KR is suitable where low input bias current is critical for maintaining accuracy in high-impedance circuits. Ensure the application environment remains within the specified commercial temperature range and that layout practices minimize parasitic leakage currents on the PCB.

Instrumentation, Op Amps, Buffer Amps Part Context

The AD648 series consists of matched pairs of low power, precision monolithic operational amplifiers fabricated using ion-implanted FET and laser wafer trimming technologies. The K grade specifically denotes performance optimized for the commercial temperature range. This family provides an economical solution for applications demanding excellent DC and AC performance without excessive power drain.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

The AD648KR is pin-compatible with industry standard dual op amps including the LF442, TL062, and AD642. Designers may substitute these parts to improve performance or achieve significant reductions in power dissipation while maintaining the same footprint and connection diagram.

Instrumentation, Op Amps, Buffer Amps FAQ

How does the AD648KR handle input bias current over its operating range?

Input bias current is guaranteed over the entire common-mode voltage range, with a maximum specification of 10 pA after a five-minute warm-up period at 25°C.

What is the impact of temperature on the AD648KR's input bias current?

For temperatures above 25°C, the input bias current doubles for every 10°C rise in chip temperature, which can become noticeable under heavy output loading conditions.