Analog Devices Inc. AD823AARZ-R7

Overview

AD823AARZ-R7 from Analog Devices is a dual-channel, JFET-input operational amplifier optimized for precision wideband signal conditioning. It delivers 17 MHz −3 dB bandwidth (G = +1), rail-to-rail output swing within 20 mV of supplies at ≤100 µA load, and 700 µV max input offset voltage - enabling high-fidelity photodiode preamplification and active filtering in single-supply 3 V to 36 V systems.

For engineers reviewing the AD823AARZ-R7 datasheet, AD823AARZ-R7 pinout, AD823AARZ-R7 application, or AD823AARZ-R7 equivalent, this page provides verified specifications, SOIC-8 pin mapping, real-world use cases in medical instrumentation and data acquisition, and validated alternative options for design continuity.

Technical Context

The AD823AARZ-R7 employs an N-channel JFET input stage fabricated on Analog Devices' XFCB process, supporting input voltages down to 0.2 V below −VS and delivering <0.3 pA typical input bias current. Its bipolar rail-to-rail output stage provides linear 40 mA drive capability with saturation resistance of ~33 Ω sourcing/sinking.

It achieves 30 V/µs slew rate and 325 ns settling time to 0.01% (2 V step) under ±15 V operation, while maintaining low distortion (−108 dBc SFDR at 20 kHz, G = −1) and 14 nV/√Hz input voltage noise at 10 kHz - making it suitable for high-dynamic-range, low-noise analog front-ends.

Key Specifications

Pinout & Package

AD823AARZ-R7 is housed in an 8-lead SOIC_N package (JEDEC MS-012AA, 150 mil width), RoHS-compliant and moisture-sensitive level 3. Thermal resistance θ_JA = 120°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual JFET-input op amp applications.

Compared with OPA2134PA and LT1364CN8#PBF, AD823AARZ-R7 uniquely balances JFET-level input impedance, rail-to-rail output, and 17 MHz bandwidth - making it the only option among the three qualified for simultaneous high-precision, high-speed, and single-supply photodiode preamplification.

Availability

AD823AARZ-R7 is available at Aetrix Electronics and suitable for photodiode preamplification, active filtering, and 12-bit to 16-bit data acquisition systems requiring stable component supply across industrial, medical, and test equipment lifecycles.

Supply support for AD823AARZ-R7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing facilities worldwide.

The AD823A product line was engineered for precision, wideband, single-supply signal conditioning - targeting applications demanding low input bias current, rail-to-rail output, and robust capacitive load drive in compact medical, instrumentation, and industrial systems.

FAQ

What is the maximum capacitive load the AD823AARZ-R7 can drive stably in unity-gain configuration?

The AD823AARZ-R7 is characterized for stable operation with ≥500 pF capacitive load in G = +1 configuration, as confirmed in the datasheet's "Capacitive Load Drive" specification (Table 1–3). At 470 pF, Figure 36 shows 35° phase margin; adding a small series resistor (per Figure 28) further improves stability for loads beyond 500 pF. This eliminates need for external isolation networks in most sensor interface designs.

Does the AD823AARZ-R7 exhibit phase reversal when input voltage exceeds the positive supply rail?

No - the AD823AARZ-R7 does not exhibit phase reversal for input voltages up to and including +VS, as demonstrated in Figure 39 of the datasheet. However, driving inputs more than +VS + 0.7 V forward-biases internal junctions; a series current-limiting resistor (e.g., 1 kΩ to 10 kΩ) is recommended for overvoltage protection beyond that threshold.

What is the guaranteed input offset voltage specification for AD823AARZ-R7 over temperature?

The AD823AARZ-R7 guarantees a maximum input offset voltage of 1.3 mV over the full industrial temperature range (−40°C to +85°C), as specified in Table 1 ("5 V Operation") under "DC PERFORMANCE". At 25°C, the max is 0.7 mV, with a typical drift of 1 µV/°C - enabling predictable calibration across operating environments.

Can AD823AARZ-R7 operate from a 3.3 V single supply while maintaining rail-to-rail output swing?

Yes - the AD823AARZ-R7 is fully specified for 3.3 V single-supply operation (Table 2). At IL = ±100 µA, output swing is 0.006 V to 3.28 V, i.e., within 6 mV of ground and 20 mV of +3.3 V. Its true single-supply capability and input common-mode range extending to −0.2 V make it ideal for low-voltage portable instrumentation.

How does the input bias current of AD823AARZ-R7 compare to other dual JFET op amps like OPA2134?

The AD823AARZ-R7 specifies 0.3 pA typical input bias current at 25°C (Table 1), matching or exceeding OPA2134's 0.8 pA typical. Both leverage JFET inputs, but AD823AARZ-R7 achieves this with higher bandwidth (17 MHz vs. 10 MHz) and lower input capacitance (0.6 pF vs. 1.5 pF), giving it superior performance in high-Z, high-frequency applications like photodiode preamps.