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Analog Devices Inc. AD822BRZ
- Part No.:
- AD822BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD822BRZ.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:220
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Product details
Overview
AD822BRZ 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 AD822BRZ datasheet, AD822BRZ pinout, AD822BRZ application, or AD822BRZ equivalent, key selection considerations include its true single-supply capability with input range extending below ground, 25 pA max input bias current for gigaohm-source interfaces, and stable 350 pF capacitive load drive without external compensation.
Technical Context
The AD822BRZ integrates two independent FET-input amplifiers on a single die, each featuring JFET input stage architecture for ultra-low input bias current and high input impedance (10¹³ Ω || 0.5 pF differential). Its input common-mode range extends 0.2 V below the negative rail and up to 1 V below the positive rail, supporting ground-referenced inputs in single-supply systems.
Output stage design enables rail-to-rail swing under load (≤15 mA), with saturation voltages specified at 20 µA, 2 mA, and 15 mA sink/source currents. The amplifier maintains stability with ≥60° phase margin into 350 pF capacitive loads in unity-gain configuration, eliminating need for isolation resistors in many sensor interface 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 wide industrial and portable power architectures. |
| Input Bias Current | Max 25 pA at 25°C - enables precision measurement with high-impedance sources (e.g., pH electrodes, photodiodes). |
| Unity-Gain Bandwidth | 1.8 MHz - sufficient for 12-bit to 14-bit data acquisition sampling up to ~100 kSPS with adequate settling. |
| Output Drive | Min 15 mA per channel - drives 10 kΩ loads directly and sustains 350 pF capacitive loads without oscillation. |
| Input Offset Voltage | Max 800 µV (B grade) - ensures ≤0.02% error in 4 V full-scale 12-bit systems without trimming. |
| Quiescent Current | Max 800 µA per amplifier - enables multi-channel low-power designs with sub-2 mA total supply current. |
| Input Voltage Noise | 13 nV/√Hz at 10 kHz - suitable for medium-bandwidth sensor signal chains where thermal noise dominates. |
Pinout & Package
AD822BRZ is housed in an 8-lead SOIC_N (R suffix) package, 5.0 mm × 6.2 mm body, 1.27 mm pitch, with standard JEDEC MS-012AC footprint and moisture sensitivity level MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Amplifier 1 output | Delivers rail-to-rail voltage swing; capable of sourcing/sinking 15 mA; requires no series resistor for 350 pF loads. |
| 2 (–IN1) | Inverting input, Amp 1 | High-impedance FET node; common-mode range extends 0.2 V below V–; sensitive to PCB leakage paths. |
| 3 (+IN1) | Non-inverting input, Amp 1 | Matches –IN1 characteristics; used for unity-gain buffers or high-Z sensor connections. |
| 4 (V–) | Negative supply rail | Reference for both amplifiers; input common-mode extends 0.2 V below this pin in single-supply mode. |
| 5 (V+) | Positive supply rail | Reference for both amplifiers; input common-mode limited to 1 V below this pin to maintain bandwidth. |
| 6 (OUT2) | Amplifier 2 output | Electrically isolated from OUT1; identical AC/DC specs; enables dual-channel filtering or I/V conversion. |
| 7 (–IN2) | Inverting input, Amp 2 | Independent high-Z node; crosstalk to Amp 1 is –130 dB at 1 kHz - suitable for mixed-signal routing. |
| 8 (+IN2) | Non-inverting input, Amp 2 | Matched to +IN1; supports independent gain-setting networks per channel without interaction. |
Key Features
| Feature | Design Value |
|---|---|
| True single-supply operation | Input range includes ground and extends 0.2 V below V–, enabling direct interfacing to 0 V-referenced sensors without level-shifting. |
| Rail-to-rail output | Swings within 10 mV of V+ and V– at light loads - maximizes dynamic range in 5 V or 3.3 V systems. |
| Capacitive load drive | Stable with 350 pF in unity-gain follower - eliminates need for output isolation resistors in piezo or cable-driven applications. |
| Low input bias current | ≤25 pA max ensures <1 µV error across 100 MΩ source impedance - critical for electrochemical and photodiode front-ends. |
| Low quiescent power | 800 µA per amplifier allows dual-channel operation at <1.6 mA - extends battery life in portable medical devices. |
Applications
| Battery-Powered Instrumentation | Photodiode Preamp |
|---|---|
|
Use Scenario: Portable pH meter with electrode input and 3.3 V MCU ADC. IC Role / Device Role / Timing Role: Precision buffer and level-shifter converting 0–400 mV electrode signal to 0–3.3 V range for SAR ADC. Use Value: Input range extending below ground accepts negative electrode potentials; rail-to-rail output fully utilizes ADC reference. |
Use Scenario: Low-light optical sensor using reverse-biased photodiode in transimpedance configuration. IC Role / Device Role / Timing Role: TIA front-end with FET input minimizing bias current-induced dark current error. Use Value: 25 pA max input bias current prevents >2.5 mV offset at 100 MΩ feedback; 350 pF drive stabilizes large-area diode capacitance. |
| Active Filters | Medical Instrumentation |
|
Use Scenario: 2nd-order Sallen-Key low-pass filter for ECG front-end with 100 Hz cutoff. IC Role / Device Role / Timing Role: Dual op amp implementing filter stages with matched DC specs to minimize passband ripple. Use Value: Matching specs (max 1.3 mV offset difference) ensure ≤0.05% gain error between stages; 1.8 MHz GBW supports filter Q up to 10. |
Use Scenario: Patient-worn vital signs monitor acquiring temperature, pulse oximetry, and respiration signals. IC Role / Device Role / Timing Role: Multi-channel signal conditioner powering analog front-end for simultaneous sensor readout. Use Value: Dual-channel integration reduces board area; 800 µA/channel enables 72-hour operation on coin-cell battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP2177ARZ | Lower offset (25 µV typ), lower noise (8 nV/√Hz), but higher quiescent current (1.2 mA) and no rail-to-rail output. | Better DC accuracy for strain gauge bridges; unsuitable for 0–5 V output swing requirements. | Select when offset drift (0.6 µV/°C) and noise dominate over power and output range constraints. |
| TLV2462IDR | Rail-to-rail I/O, lower supply current (550 µA), but higher input bias (1 pA) and lower GBW (6.4 MHz). | Higher speed for fast-settling filters; insufficient input impedance for >10 MΩ sensor sources. | Select for cost-sensitive, moderate-precision applications where 1 pA bias is acceptable and 5 V supply is fixed. |
Compared with OP2177ARZ and TLV2462IDR, AD822BRZ uniquely balances rail-to-rail output, sub-1 nA input bias, and 1.8 MHz bandwidth at <800 µA - making it optimal for dual-channel, battery-powered sensor interfaces requiring ground-sensing capability.
Availability
AD822BRZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode preamplifiers, and active filter designs requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for AD822BRZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets since 1965.
The AD822 belongs to Analog Devices' precision FET-input op amp product line, engineered for low-power, high-impedance signal conditioning in portable and medical instrumentation where input bias current and supply efficiency are critical.
FAQ
What supply voltage ranges does the AD822BRZ support?
The AD822BRZ operates from single supplies 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 rails. This makes AD822BRZ suitable for 3.3 V, 5 V, and 24 V industrial systems without level-shifting circuitry.
Does AD822BRZ require external compensation for capacitive loads?
No, AD822BRZ is internally compensated to drive up to 350 pF directly in unity-gain configuration without oscillation or peaking. This eliminates the need for series output resistors in photodiode preamps or cable-driven applications. Stability is maintained across temperature and supply variations, as verified in Figure 16 of the AD822BRZ datasheet Rev. J.
What is the maximum input bias current specification for AD822BRZ?
The AD822BRZ has a maximum input bias current of 25 pA at 25°C (B grade), rising to 5 nA at +85°C. This ultra-low bias enables accurate interfacing with high-impedance sources such as pH electrodes, piezoelectric sensors, and photodiodes. The AD822BRZ's FET input architecture ensures consistent performance across its –40°C to +85°C operating range.
Can AD822BRZ be used in single-supply photodiode transimpedance amplifiers?
Yes, AD822BRZ is well-suited for single-supply photodiode TIAs due to its input voltage range extending below ground, rail-to-rail output, and 25 pA max input bias current. When configured with a reverse-biased photodiode connected to the inverting input and appropriate feedback network, AD822BRZ achieves low dark-current error and stable response - as demonstrated in Application Note AN-399.
How does AD822BRZ compare to AD820 in terms of performance and pin compatibility?
AD822BRZ is a dual-channel version of AD820 (single-channel); both share identical electrical specs, SOIC-8 pinout, and performance grades. Pin 1–4 and 5–8 map identically to AD820's single amplifier plus power pins, enabling drop-in dual-channel upgrades. AD822BRZ adds channel matching specs (e.g., 1.3 mV max inter-channel offset), making it preferable for multi-stage filters or differential signal paths.
AD822BRZ 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:
- 300 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
AD822BRZ FAQ
1.How can I place an order for AD822BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD822BRZ 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 AD822BRZ reliable?
The price and inventory of AD822BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD822BRZ is usually 5 days.
3.What payment methods are accepted for AD822BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD822BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD822BRZ?
AD822BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD822BRZ 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 AD822BRZ?
For technical support, including AD822BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD822BRZ requirements.
6.How does Aetrix verify that AD822BRZ is sourced from the original manufacturer or authorized distributors?
All AD822BRZ 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 AD822BRZ meets industry standards.
7.What is the process for return or replacement of AD822BRZ?
All AD822BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD822BRZ, 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 AD822BRZ part is unused and in its original packaging.
Return procedure for AD822BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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