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Analog Devices Inc. AD822ARZ
- Part No.:
- AD822ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD822ARZ.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,632
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Product details
Overview
AD822ARZ from Analog Devices is a dual-channel, precision, low-power FET-input operational amplifier designed for single-supply (5 V to 30 V) or 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 AD822ARZ datasheet, AD822ARZ pinout, AD822ARZ application, or AD822ARZ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative op amps with documented functional trade-offs.
Technical Context
The AD822ARZ employs JFET-input stages to achieve ultra-low input bias current (≤25 pA) and high input impedance (10¹³ Ω || 2.8 pF), supporting precision interfacing with high-impedance sources like photodiodes and pH sensors. Its true single-supply capability includes input voltage range extending 0.2 V below ground and rail-to-rail output swing - critical for maximizing dynamic range in 5 V systems.
It features matched dual amplifiers with ≤1.6 mV max offset matching and −130 dB crosstalk at 1 kHz, ensuring minimal inter-channel interference in multi-channel data acquisition. The amplifier drives ≥15 mA output current and stabilizes with up to 350 pF capacitive loads in unity-gain configuration, eliminating need for external isolation resistors in sensor buffer applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single: 5 V to 30 V; Dual: ±2.5 V to ±15 V - supports direct integration into 5 V microcontroller systems and industrial ±12 V rails. |
| Input Offset Voltage | Max 0.8 mV (B grade, 25°C) - enables accurate DC-coupled amplification of mV-level sensor signals without nulling circuitry. |
| Unity-Gain Bandwidth | 1.8 MHz - sufficient for anti-aliasing filters and active filter stages up to ~100 kHz with stable phase margin. |
| Slew Rate | 3 V/µs - allows clean reproduction of 100 kHz full-scale sine waves at 4.5 VPP without distortion. |
| Input Bias Current | Max 25 pA (25°C) - preserves signal integrity when amplifying from gigaohm source impedances (e.g., glass electrodes, piezoresistive sensors). |
| Capacitive Load Drive | 350 pF @ G = +1 - eliminates need for series output resistance when driving ADC input capacitance or long PCB traces. |
| Quiescent Current | 800 µA per amplifier - enables dual-op-amp signal chains in portable devices with <2 mA total analog supply current. |
Pinout & Package
AD822ARZ is packaged in an 8-lead SOIC_N (R suffix) with standard industry footprint and thermal resistance θJA = 160°C/W. Pin functions are electrically identical across PDIP, MSOP, and SOIC_N variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Amplifier 1 output | Delivers rail-to-rail voltage with ≤10 mV saturation margin; capable of sourcing/sinking 15 mA. |
| 2 (–IN1) | Inverting input, Amp 1 | High-impedance FET node; common-mode range extends 0.2 V below negative rail in single-supply mode. |
| 3 (+IN1) | Non-inverting input, Amp 1 | Matches –IN1 characteristics; used for unity-gain buffers and precision reference followers. |
| 4 (V–) | Negative supply rail | Connects to ground (single-supply) or negative voltage (dual-supply); supports input common-mode down to −0.2 V. |
| 5 (+IN2) | Non-inverting input, Amp 2 | Electrically isolated from Amp 1; enables independent dual-channel signal paths with <−130 dB crosstalk. |
| 6 (–IN2) | Inverting input, Amp 2 | Same FET-input performance as Pin 2; supports matched differential pair configurations. |
| 7 (OUT2) | Amplifier 2 output | Functionally identical to Pin 1; allows simultaneous processing of two analog channels on one IC. |
| 8 (V+) | Positive supply rail | Accepts 5–30 V (single) or +2.5 to +15 V (dual); PSRR ≥66 dB ensures immunity to supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings within 10 mV of V+ and V− - maximizes usable output range in low-voltage 5 V systems. |
| True single-supply input | Input common-mode extends 0.2 V below V− - enables accurate amplification of signals referenced to ground in unipolar supplies. |
| Low input bias current | ≤25 pA at 25°C - prevents loading errors in high-Z sensor interfaces (e.g., photodiodes, electrochemical cells). |
| High capacitive load drive | Stable with 350 pF directly at output - simplifies anti-aliasing filter design and eliminates external isolation components. |
| Dual-amplifier matching | ≤1.6 mV max offset mismatch - supports precision instrumentation amplifier front-ends and matched gain stages. |
Applications
| Battery-Powered Instrumentation | Photodiode Preamp |
|---|---|
Use Scenario: Portable gas analyzer measuring weak current from UV photodiode under 3.3 V/5 V battery supply. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal input error and no external bias network. Use Value: 25 pA input bias avoids signal loss; rail-to-rail output uses full ADC input range; 800 µA quiescent current extends battery life. |
Use Scenario: Medical pulse oximeter detecting nanoscale photocurrent variations from red/IR LEDs through tissue. IC Role / Device Role / Timing Role: Low-noise, high-Z transimpedance stage with 13 nV/√Hz input noise at 10 kHz and sub-mV offset. Use Value: FET input preserves signal fidelity; 1.8 MHz bandwidth supports fast pulse detection; dual channel enables simultaneous red/IR path processing. |
| Active Filter Stage | 12–14-Bit Data Acquisition |
Use Scenario: Anti-aliasing filter in handheld test equipment requiring precise cutoff and low THD (<−93 dB at 10 kHz). IC Role / Device Role / Timing Role: Unity-gain buffer and second-order Sallen-Key stage with stable phase margin into 350 pF loads. Use Value: 3 V/µs slew rate prevents distortion on 100 kHz filter edges; 350 pF drive capability eliminates output RC compensation. |
Use Scenario: Signal conditioning front-end for industrial DAQ system digitizing thermocouple and strain gauge outputs. IC Role / Device Role / Timing Role: Precision gain stage and reference buffer with matched dual amps for differential input rejection. Use Value: 0.8 mV max offset and 2 µV/°C drift ensure <1 LSB error over temperature in 14-bit systems; CMRR ≥66 dB suppresses common-mode noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2134PA | Higher 8 MHz GBW, 20 V/µs slew rate; 500 µA higher quiescent current (1.3 mA per amp); same 8-lead DIP/SOIC package. | Better for wideband audio or fast-settling filters; less suitable for ultra-low-power battery operation. | Select OPA2134PA when bandwidth >2 MHz is required and supply current budget allows ≥2.6 mA total. |
| LT1782CS8#PBF | Lower 450 µA quiescent current; 1.2 MHz GBW; 1.5 V/µs slew rate; only available in 8-lead SOIC. | Optimized for sub-1 mA portable designs where 1.2 MHz bandwidth suffices; reduced drive strength (10 mA) limits heavy-load use. | Select LT1782CS8#PBF when minimizing supply current is primary and 1.2 MHz bandwidth meets system requirements. |
Compared with AD822ARZ, OPA2134PA trades 5× higher power for 4.4× more bandwidth and faster settling, while LT1782CS8#PBF reduces quiescent current by 44% at the cost of bandwidth and output drive - making AD822ARZ the balanced choice for precision, low-power, rail-to-rail dual op amp needs.
Availability
AD822ARZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode preamplifiers, and 12-bit to 14-bit data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD822ARZ 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 operations worldwide.
The AD822 belongs to Analog Devices' precision FET-input op amp product line, engineered for low-power, single-supply signal conditioning in medical, instrumentation, and industrial sensing applications where input bias current, offset stability, and rail-to-rail operation are critical.
FAQ
What supply voltage ranges does the AD822ARZ support?
The AD822ARZ operates from a single supply of 5 V to 30 V or dual supplies of ±2.5 V to ±15 V. At 5 V single supply, it maintains full functionality including input voltage range extending 0.2 V below ground and rail-to-rail output swing - making AD822ARZ ideal for modern low-voltage embedded systems without negative rails.
Does the AD822ARZ require external compensation for stability?
No, the AD822ARZ is unity-gain stable and drives up to 350 pF capacitive load without external compensation. Its internal compensation ensures stable operation in follower, inverter, and active filter configurations - a key advantage confirmed in Figure 16 (gain/phase vs. frequency) and Table 1 (capacitive load drive specification) of the AD822ARZ datasheet.
How does the AD822ARZ perform in photodiode transimpedance applications?
The AD822ARZ excels in photodiode preamplifiers due to its ≤25 pA input bias current, 13 nV/√Hz input voltage noise at 10 kHz, and rail-to-rail output. These specs minimize dark-current error and preserve signal-to-noise ratio - directly enabling accurate low-light detection in AD822ARZ-based TIA circuits as cited in the Applications section of its datasheet.
What is the maximum output current capability of the AD822ARZ?
The AD822ARZ delivers a minimum output current of ±15 mA under specified conditions (Table 1, Output Characteristics), with headroom to ±20 mA at ±15 V supplies. This allows direct driving of moderate loads like ADC input networks or LED bias circuits without external buffers - a verified capability stated in the General Description and confirmed in Figure 21 (output saturation vs. load current).
Is the AD822ARZ pin-compatible with other dual op amps in SOIC-8 packages?
The AD822ARZ uses standard SOIC-8 pinout (OUT1, –IN1, +IN1, V–, +IN2, –IN2, OUT2, V+), matching industry conventions for dual op amps. However, pin compatibility alone does not guarantee functional interchangeability - parameters like input bias current (25 pA), offset (0.8 mV), and supply range must be verified against target alternatives before substitution.
AD822ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 1.9 MHz
- -3db Bandwidth:
- 1.9 MHz
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 1.24mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD822ARZ FAQ
1.How can I place an order for AD822ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD822ARZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD822ARZ reliable?
The price and inventory of AD822ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD822ARZ is usually 5 days.
3.What payment methods are accepted for AD822ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD822ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD822ARZ?
AD822ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD822ARZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD822ARZ?
For technical support, including AD822ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD822ARZ requirements.
6.How does Aetrix verify that AD822ARZ is sourced from the original manufacturer or authorized distributors?
All AD822ARZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD822ARZ meets industry standards.
7.What is the process for return or replacement of AD822ARZ?
All AD822ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD822ARZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD822ARZ part is unused and in its original packaging.
Return procedure for AD822ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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