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Analog Devices Inc. AD822ANZ
- Part No.:
- AD822ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD822ANZ.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:614
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Product details
Overview
AD822ANZ from Analog Devices is a dual-channel, precision FET-input operational amplifier optimized for single-supply and dual-supply operation (5 V to 30 V or ±2.5 V to ±15 V). 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 µV max input offset voltage - enabling high-accuracy signal conditioning in battery-powered instrumentation and photodiode preamplifiers.
For engineers reviewing the AD822ANZ datasheet, AD822ANZ pinout, AD822ANZ application, or AD822ANZ equivalent, key selection considerations include its true single-supply capability with input voltage range extending below ground, 25 pA max input bias current for gigaohm-source interfaces, and 350 pF capacitive load drive without external compensation.
Technical Context
The AD822ANZ employs a JFET-input stage with ultra-high input impedance (10¹³ Ω differential and common-mode), enabling precision amplification of low-current sources like photodiodes and piezoelectric sensors. Its rail-to-rail output stage uses complementary bipolar transistors to achieve <10 mV saturation voltage at light loads while maintaining 15 mA minimum output current capability.
Designed for stability across supply configurations, the AD822ANZ maintains consistent ac performance - including 1.8 MHz bandwidth and –93 dB THD at 10 kHz - under both 5 V single-supply and ±15 V dual-supply conditions. Input common-mode range extends to −0.2 V below negative rail (single-supply) or −15.2 V (±15 V), supporting ground-referenced inputs in low-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 5 V to 30 V single-supply or ±2.5 V to ±15 V dual-supply - supports portable and industrial power architectures without level-shifting. |
| Input Offset Voltage | ≤800 µV max (B grade, 25°C) - enables accurate dc-coupled gain stages in 12–14-bit data acquisition systems. |
| Input Bias Current | ≤25 pA max (25°C) - preserves signal integrity with high-impedance sources (e.g., pH electrodes, photodiodes). |
| Unity-Gain Bandwidth | 1.8 MHz - sufficient for anti-aliasing filters and active sensor conditioning up to ~100 kHz. |
| Slew Rate | 3 V/µs - ensures faithful reproduction of fast transient signals (e.g., pulse oximetry waveforms) without distortion. |
| Capacitive Load Drive | 350 pF - eliminates need for isolation resistors when driving ADC input capacitance or long PCB traces. |
| Quiescent Current | 800 µA per amplifier max - enables multi-channel, always-on sensing in energy-constrained battery applications. |
Pinout & Package
AD822ANZ is packaged in an 8-lead PDIP (Plastic Dual In-line Package) with standard through-hole mounting. The package has 0.3 inch body width, 0.1 inch lead pitch, and meets JEDEC MS-001 specifications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output - drives loads up to 15 mA; swings rail-to-rail with ≤10 mV headroom at light loads. |
| 2 | –IN1 | Inverting input of Amp 1 - high-impedance FET node; accepts signals down to −0.2 V below V– in single-supply mode. |
| 3 | +IN1 | Non-inverting input of Amp 1 - matched to –IN1 for low input offset; used in follower, summing, and difference configurations. |
| 4 | V– | Negative supply rail - referenced to ground in single-supply operation; supports input common-mode down to −0.2 V. |
| 5 | V+ | Positive supply rail - supplies both amplifiers; enables operation from 5 V up to 30 V or ±15 V. |
| 6 | OUT2 | Amplifier 2 output - electrically isolated from OUT1; shares same rail-to-rail output architecture and load drive capability. |
| 7 | –IN2 | Inverting input of Amp 2 - independent channel; crosstalk to Amp 1 is ≤−130 dB at 1 kHz. |
| 8 | +IN2 | Non-inverting input of Amp 2 - fully matched to +IN1; allows dual-channel synchronous signal processing without inter-channel interference. |
Key Features
| Feature | Design Value |
|---|---|
| True single-supply operation | Input common-mode range extends to −0.2 V below V–, enabling ground-referenced inputs without negative supply. |
| Rail-to-rail output swing | Output reaches within 10 mV of V+ and V– at ISINK/ISOURCE ≤20 µA - maximizes dynamic range in low-voltage systems. |
| Ultra-low input bias current | ≤25 pA max at 25°C - minimizes voltage error across source impedances >1 GΩ (e.g., glass pH electrodes). |
| High capacitive load drive | Stable with 350 pF directly on output - simplifies interface to SAR ADCs and eliminates external isolation components. |
| Low quiescent power | 800 µA per amplifier max - supports dual-channel precision amplification in sub-2 mA total system power budgets. |
Applications
| Photodiode Preamp | Active Filter |
|---|---|
|
Use Scenario: Amplifying low-level current from reverse-biased silicon photodiodes in optical smoke detectors or spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier with FET-input stage to preserve signal-to-noise ratio and avoid loading high-impedance junction capacitance. Use Value: 25 pA input bias current prevents dark-current-induced offset drift; 1.8 MHz bandwidth supports >100 kHz modulation frequencies. |
Use Scenario: Implementing 2nd-order Sallen-Key low-pass filters in medical ECG front-ends to suppress 50/60 Hz interference. IC Role / Device Role / Timing Role: Dual op-amp providing gain, pole placement, and buffer isolation in a single 8-pin package. Use Value: Matched amplifier characteristics ensure consistent filter response between channels; rail-to-rail output avoids clipping near supply rails. |
| Battery-Powered DAQ | Medical Instrumentation |
|
Use Scenario: Signal conditioning for 14-bit SAR ADCs in handheld multimeters or portable environmental sensors. IC Role / Device Role / Timing Role: Precision gain stage and reference buffer operating from a single 9 V alkaline cell (5–9 V range). Use Value: 800 µV max offset and 2 µV/°C drift maintain calibration over temperature; 800 µA quiescent current extends battery life. |
Use Scenario: Isolating and amplifying biopotential signals (e.g., EEG, EMG) in clinical-grade patient monitors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with ultra-low noise (13 nV/√Hz at 10 kHz) and high CMRR. Use Value: 80 dB min CMRR at dc rejects common-mode interference from power-line coupling; dual-channel layout reduces board space vs. discrete solutions. |
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 |
|---|---|---|---|
| TL072CDR | Higher input bias current (30 pA typ vs. 25 pA max), lower CMRR (70 dB min), no guaranteed rail-to-rail output. | Less suitable for gigaohm-source photodiode preamps or precision single-supply systems requiring full output swing. | Lower-cost option where offset drift and capacitive load drive are non-critical. |
| OPA2134PA | Lower input voltage noise (8 nV/√Hz), higher quiescent current (4 mA), wider supply range (±4 V to ±18 V). | Better for audio-grade low-noise applications but consumes >5× more power - unsuitable for battery longevity-critical designs. | Preferred when ultra-low noise dominates over power efficiency and output swing constraints. |
Compared with TL072CDR and OPA2134PA, AD822ANZ uniquely balances ultra-low input bias current, rail-to-rail output, and sub-1 mA quiescent power - making it optimal for dual-channel, battery-powered precision analog front-ends where all three parameters are simultaneously constrained.
Availability
AD822ANZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode preamplifiers, and active filters requiring stable component supply and long-term industrial temperature support (–40°C to +85°C).
Supply support for AD822ANZ 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 for low-power, high-impedance signal conditioning in portable test equipment, medical diagnostics, and industrial process control.
FAQ
What supply voltage ranges does the AD822ANZ support?
The AD822ANZ 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, and output swings to within 10 mV of both rails - making AD822ANZ ideal for 5 V microcontroller-based systems without negative supplies.
Does the AD822ANZ require external compensation for stability?
No, the AD822ANZ is unity-gain stable and drives up to 350 pF of capacitive load directly without external compensation. This capability is verified across all supply conditions (5 V single-supply, ±5 V, and ±15 V) and eliminates series isolation resistors typically needed with other FET-input op amps - simplifying design for ADC driver and cable-driving applications.
What is the maximum input bias current specification for AD822ANZ?
The AD822ANZ guarantees ≤25 pA maximum input bias current at 25°C (B grade), with ≤5 nA at maximum operating temperature (+85°C). This ultra-low value enables accurate amplification of nanoamp-level currents from photodiodes, ion-selective electrodes, and piezoelectric sensors - a key differentiator versus bipolar-input op amps.
How does the AD822ANZ perform in single-supply photodiode preamp configurations?
In transimpedance configurations, AD822ANZ's FET input preserves photodiode junction integrity, its rail-to-rail output maximizes dynamic range from a 5 V supply, and its 1.8 MHz bandwidth supports pulsed-light detection up to 100 kHz. The AD822ANZ also exhibits no phase inversion - critical for stable feedback with high-value feedback resistors.
Is the AD822ANZ pin-compatible with other dual op amps in PDIP-8 packages?
The AD822ANZ follows the industry-standard dual op amp pinout (OUT1, –IN1, +IN1, V–, V+, OUT2, –IN2, +IN2), matching TL072, OP27, and OPA2134 in PDIP-8. However, functional compatibility requires verification of supply range, input/output swing, and bias current requirements - AD822ANZ's rail-to-rail output and sub-25 pA bias current are not replicated by most legacy dual op amps.
AD822ANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD822ANZ FAQ
1.How can I place an order for AD822ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD822ANZ 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 AD822ANZ reliable?
The price and inventory of AD822ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD822ANZ is usually 5 days.
3.What payment methods are accepted for AD822ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD822ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD822ANZ?
AD822ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD822ANZ 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 AD822ANZ?
For technical support, including AD822ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD822ANZ requirements.
6.How does Aetrix verify that AD822ANZ is sourced from the original manufacturer or authorized distributors?
All AD822ANZ 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 AD822ANZ meets industry standards.
7.What is the process for return or replacement of AD822ANZ?
All AD822ANZ units undergo pre-shipment inspection (PSI). If there is an issue with AD822ANZ, 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 AD822ANZ part is unused and in its original packaging.
Return procedure for AD822ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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