Analog Devices Inc. AD822BR

Overview

AD822BR from Analog Devices is a dual-channel, precision, low-power FET-input operational amplifier designed for single-supply (5 V to 30 V) and dual-supply (±2.5 V to ±15 V) operation. It delivers rail-to-rail output swing (within 10 mV of rails), 1.8 MHz unity-gain bandwidth, 3 V/µs slew rate, and 800 µV max input offset voltage - enabling high-accuracy signal conditioning in battery-powered instrumentation and photodiode preamplifiers.

For engineers reviewing the AD822BR datasheet, AD822BR pinout, AD822BR application, or AD822BR equivalent, key selection considerations include its true single-supply capability with input voltage range extending below ground, capacitive load drive up to 350 pF, and guaranteed 15 mA output current per channel across −40°C to +85°C.

Technical Context

The AD822BR employs JFET input stage architecture to achieve ultra-low input bias current (≤25 pA) and high input impedance (10¹³ Ω || 2.8 pF common-mode), supporting precision interfacing with high-impedance sensors and photodiodes. Its rail-to-rail output stage uses complementary bipolar output transistors to deliver full dynamic range under light and moderate loads.

DC precision is maintained via low offset drift (2 µV/°C typical), excellent CMRR (≥66 dB over temperature), and robust PSRR (≥66 dB). AC performance includes −93 dB THD at 10 kHz (VS = ±5 V) and stable unity-gain operation with ≥45° phase margin into 350 pF capacitive loads.

Key Specifications

Pinout & Package

AD822BR is supplied in an 8-lead SOIC_N (R suffix) package, measuring 4.90 mm × 3.91 mm × 1.75 mm, with standard JEDEC MS-012AC footprint and 1.27 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2134PA and TL072CDR, the AD822BR uniquely balances ultra-low power (0.8 mA), rail-to-rail output, and sub-mV offset in a single dual FET-input package - making it optimal for portable precision analog signal chains where supply voltage and power budget are constrained.

Availability

AD822BR is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode preamplifiers, and active filters requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature range (−40°C to +85°C).

Supply support for AD822BR 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.

The AD822BR belongs to Analog Devices' precision FET-input op amp product line, engineered for low-power, high-impedance sensor signal conditioning in portable and industrial measurement systems.

FAQ

What supply voltage ranges does the AD822BR support?

The AD822BR operates from a single supply of 5 V to 30 V or dual supplies of ±2.5 V to ±15 V. Its true single-supply capability allows input common-mode voltage to extend 0.2 V below the negative rail, and output swings within 10 mV of both supply rails. This makes the AD822BR suitable for 3.3 V, 5 V, and 12 V systems without level-shifting circuitry.

Does the AD822BR require external compensation for stability?

No, the AD822BR is internally compensated for unity-gain stability and remains stable driving up to 350 pF capacitive loads directly at the output. No external compensation components are needed for standard configurations like followers or inverting/non-inverting amplifiers with gains ≥1, as confirmed in Figure 16 and Applications Information section of the AD822BR datasheet.

What is the maximum output current capability of the AD822BR?

The AD822BR delivers a minimum of 15 mA per amplifier into resistive loads while maintaining rail-to-rail swing. At 15 mA sink/source, output saturation voltage is ≤1000 mV below V+ or above V– (depending on direction), as specified in Table 1 and Table 2 of the AD822BR datasheet under "Output Saturation Voltage" test conditions.

How does the AD822BR handle input signals below ground in single-supply mode?

In single-supply mode (e.g., V+ = 5 V, V– = GND), the AD822BR's input common-mode range extends to −0.2 V, allowing small negative transients or AC-coupled signals centered near ground to be amplified without clipping. This eliminates the need for external biasing networks in many sensor interface applications involving the AD822BR.

Is the AD822BR pin-compatible with other dual op amps in SOIC-8 packages?

The AD822BR follows the industry-standard dual op amp pinout (OUT1, –IN1, +IN1, V–, V+, OUT2, –IN2, +IN2), matching SOIC-8 footprints of devices like TL072 and OP27. However, functional compatibility depends on specifications - the AD822BR's FET input, rail-to-rail output, and low power are not replicated by those parts, so electrical validation is required before substitution.