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Analog Devices Inc. AD822BRZ-REEL7
- Part No.:
- AD822BRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD822BRZ-REEL7.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:739
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Product details
Overview
AD822BRZ-REEL7 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 in battery-powered instrumentation and photodiode preamplifiers. It delivers rail-to-rail output swing within 10 mV of each rail, 1.8 MHz unity-gain bandwidth, 3 V/µs slew rate, and 800 µA maximum quiescent current per amplifier.
For engineers reviewing the AD822BRZ-REEL7 datasheet, AD822BRZ-REEL7 pinout, AD822BRZ-REEL7 application, or AD822BRZ-REEL7 equivalent, key selection criteria include input bias current ≤25 pA, input offset voltage ≤800 µV, capacitive load drive up to 350 pF, and operation across –40°C to +85°C with true single-supply capability extending input range below ground.
Technical Context
The AD822BRZ-REEL7 employs JFET input stage architecture enabling ultra-low input bias current (≤25 pA) and high input impedance (10¹³ Ω || 0.5 pF differential), critical for high-impedance sensor interfaces like photodiodes. Its rail-to-rail output stage supports full dynamic range in low-voltage systems, while internal compensation ensures stability with ≥350 pF capacitive loads at unity gain.
DC precision is maintained via 2 µV/°C typical offset drift and CMRR ≥66 dB over temperature. The device operates without phase inversion and sustains 15 mA output current into resistive loads, enabling direct driving of ADC reference buffers and active filter stages without external boost circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single: 5 V to 30 V; Dual: ±2.5 V to ±15 V - enables flexible power architecture in portable and industrial systems. |
| Unity-Gain Bandwidth | 1.8 MHz - supports stable closed-loop operation up to ~100 kHz in gain-of-10 configurations for data acquisition front-ends. |
| Slew Rate | 3 V/µs - ensures faithful reproduction of 100 kHz full-scale sine waves with ≤1% distortion in 12-bit systems. |
| Input Offset Voltage | Max 800 µV - minimizes DC error in precision transducer signal conditioning and low-drift reference buffers. |
| Quiescent Current | Max 800 µA per amplifier - allows dual-opamp functionality in sub-2 mA total supply budget for coin-cell–powered devices. |
| Capacitive Load Drive | 350 pF at G = +1 - eliminates need for isolation resistors when driving ADC input capacitance or long PCB traces. |
| Input Bias Current | Max 25 pA at 25°C - preserves signal integrity in gigaohm-source applications such as pH electrodes and piezoelectric sensors. |
Pinout & Package
AD822BRZ-REEL7 is packaged in an 8-lead SOIC_N (Small Outline Integrated Circuit, narrow body) with standard pinout compatible across AD822 variants. Thermal resistance θJA = 160°C/W supports operation up to +85°C ambient with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Amplifier 1 output | Delivers rail-to-rail voltage swing; capable of sourcing/sinking 15 mA for direct interface to ADC inputs or analog switches. |
| 2 (–IN1) | Inverting input, Amp 1 | High-impedance JFET node; accepts signals down to –0.2 V under single 5 V supply, enabling ground-referenced AC coupling. |
| 3 (+IN1) | Non-inverting input, Amp 1 | Matches –IN1 characteristics; used for unity-gain buffer or precision difference amplification with matched feedback networks. |
| 4 (V–) | Negative supply rail | Connects to ground in single-supply mode; must be decoupled with 0.1 µF ceramic capacitor near pin for noise immunity. |
| 5 (+IN2) | Non-inverting input, Amp 2 | Independent channel input; identical specs to +IN1 - supports dual-path signal processing without crosstalk degradation (–130 dB @ 1 kHz). |
| 6 (–IN2) | Inverting input, Amp 2 | Matches Amp 1 input behavior; enables simultaneous conditioning of two sensor channels with matched DC performance. |
| 7 (OUT2) | Amplifier 2 output | Functionally identical to OUT1; allows independent gain staging or differential output generation without external components. |
| 8 (V+) | Positive supply rail | Accepts up to +30 V; requires local 0.1 µF ceramic + 10 µF tantalum decoupling to maintain PSRR >66 dB across frequency. |
Key Features
| Feature | Design Value |
|---|---|
| True single-supply operation | Input common-mode range extends 0.2 V below V–, enabling direct interfacing to ground-referenced sensors without level-shifting circuitry. |
| Rail-to-rail output swing | Output reaches within 10 mV of both rails at light loads, maximizing dynamic range in 3.3 V or 5 V microcontroller-based systems. |
| Low input voltage noise | 13 nV/√Hz at 10 kHz - preserves SNR in photodiode preamps and strain gauge bridges where signal amplitudes are sub-millivolt. |
| No phase inversion | Eliminates output polarity reversal during input overdrive, preventing latch-up or erroneous control decisions in closed-loop regulators. |
| High capacitive load tolerance | Stable with 350 pF directly on output - simplifies anti-aliasing filter design and enables direct connection to SAR ADC sample capacitors. |
Applications
| Photodiode Preamp | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Amplifying weak current from reverse-biased photodiodes in portable spectrometers or pulse oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier with FET input preserving nanoamp-level signal integrity and minimizing dark current error. Use Value: 25 pA max input bias current prevents signal loss in high-gain (>1 MΩ) configurations; rail-to-rail output maximizes ADC utilization in 3.3 V systems. |
Use Scenario: Signal conditioning in handheld multimeters, environmental sensors, or portable ECG monitors. IC Role / Device Role / Timing Role: Dual-channel precision amplifier for simultaneous sensor excitation and measurement, reducing component count. Use Value: 800 µA per amplifier enables two op-amp functions within 2 mA total supply budget - extending coin-cell life beyond 1 year. |
| Active Filter Stage | 12–14-Bit Data Acquisition |
Use Scenario: Implementing 2nd-order Sallen-Key low-pass filters in anti-aliasing or reconstruction paths. IC Role / Device Role / Timing Role: Unity-gain buffer isolating filter output from ADC input capacitance and PCB trace effects. Use Value: 350 pF capacitive load drive eliminates need for series isolation resistor, preserving filter Q-factor and passband flatness. |
Use Scenario: Front-end amplification and level-shifting for successive-approximation register (SAR) ADCs in industrial PLC modules. IC Role / Device Role / Timing Role: Precision gain stage with matched dual channels enabling simultaneous sampling of differential sensor pairs. Use Value: 0.5 mV max initial offset matching between channels ensures <0.01% gain error in ratiometric measurements across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2134PA | Higher quiescent current (4 mA vs. 0.8 mA); wider bandwidth (8 MHz vs. 1.8 MHz); lower input bias current (1 pA typical). | Better suited for audio-grade applications requiring ultra-low noise floor; less optimal for battery-constrained designs. | Select OPA2134PA only when THD < –100 dB at 1 kHz is required and power budget exceeds 4 mA per channel. |
| LT1782CS8#TRPBF | Lower supply current (650 µA typ); smaller MSOP-8 package; reduced output drive (10 mA vs. 15 mA). | Optimized for space-constrained medical wearables; limited ability to drive heavy capacitive loads (>200 pF). | Choose LT1782CS8#TRPBF when board area is critical and load capacitance remains below 200 pF with no need for 15 mA output. |
Compared with OPA2134PA and LT1782CS8#TRPBF, AD822BRZ-REEL7 uniquely balances ultra-low input bias current, rail-to-rail output, and 350 pF capacitive load drive at sub-1 mA supply - making it the preferred choice for dual-channel, battery-powered precision sensing where size, power, and stability coexist as hard constraints.
Availability
AD822BRZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode preamplifiers, active filters, and 12-bit to 14-bit data acquisition systems requiring stable component supply across industrial temperature ranges.
Supply support for AD822BRZ-REEL7 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 AD822 belongs to Analog Devices' precision FET-input op amp product line, engineered specifically for low-power, high-impedance sensor signal conditioning in portable and industrial instrumentation.
FAQ
What supply voltage range does the AD822BRZ-REEL7 support?
The AD822BRZ-REEL7 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 voltages to extend 0.2 V below the negative rail, supporting ground-referenced inputs in 5 V systems. This flexibility makes AD822BRZ-REEL7 ideal for mixed-voltage industrial and portable designs where supply rails vary across subsystems.
Does the AD822BRZ-REEL7 have rail-to-rail input and output capability?
The AD822BRZ-REEL7 features rail-to-rail output swing - delivering voltage within 10 mV of both supply rails under light loads - but its input common-mode range extends only to within 1 V of the positive rail and 0.2 V below the negative rail. Input signals beyond this range cause bandwidth reduction and increased error; thus, AD822BRZ-REEL7 is not a full rail-to-rail input device, though its extended negative range supports true single-supply use cases.
What is the maximum capacitive load the AD822BRZ-REEL7 can drive stably?
The AD822BRZ-REEL7 is characterized to drive up to 350 pF of capacitive load in unity-gain follower configuration without oscillation or excessive overshoot. This specification is verified per Figure 16 in the Rev. J datasheet and enables direct connection to ADC input capacitors, long PCB traces, or LCD bias networks without added isolation resistors - a key advantage over many general-purpose op amps that require ≥1 kΩ series resistance for stability.
How does the AD822BRZ-REEL7 perform in terms of input offset voltage and drift?
The AD822BRZ-REEL7 guarantees a maximum input offset voltage of 800 µV and typical offset drift of 2 µV/°C across the –40°C to +85°C industrial temperature range. These values are specified for both A-grade and B-grade versions, ensuring predictable DC error accumulation in precision transducer interfaces. For example, over a 100°C span, total offset shift remains under 200 µV - critical for maintaining accuracy in uncalibrated medical or environmental sensors.
Is the AD822BRZ-REEL7 suitable for photodiode transimpedance applications?
Yes, the AD822BRZ-REEL7 is well-suited for photodiode transimpedance amplifiers due to its 25 pA maximum input bias current, 13 nV/√Hz input voltage noise at 10 kHz, and absence of phase inversion. Its JFET input preserves nanoamp-level photocurrent integrity, while rail-to-rail output maximizes dynamic range in low-voltage systems. Application circuits like Figure 29 in the datasheet validate stable operation with 100 pF feedback capacitance and high-value transimpedance resistors.
AD822BRZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-REEL7 FAQ
1.How can I place an order for AD822BRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD822BRZ-REEL7 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-REEL7 reliable?
The price and inventory of AD822BRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD822BRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD822BRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD822BRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD822BRZ-REEL7?
AD822BRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD822BRZ-REEL7 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-REEL7?
For technical support, including AD822BRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD822BRZ-REEL7 requirements.
6.How does Aetrix verify that AD822BRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD822BRZ-REEL7 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-REEL7 meets industry standards.
7.What is the process for return or replacement of AD822BRZ-REEL7?
All AD822BRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD822BRZ-REEL7, 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-REEL7 part is unused and in its original packaging.
Return procedure for AD822BRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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