My Inquiry
My Account
Analog Devices Inc. AD8422ARZ
- Part No.:
- AD8422ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8422ARZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:131
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD8422ARZ from Analog Devices is a high-precision, low-power, rail-to-rail instrumentation amplifier optimized for precision sensor signal conditioning. It delivers 8 nV/√Hz input voltage noise at 1 kHz, 0.15 µV p-p RTI noise (G = 100), and 80 dB CMRR at 10 kHz (G = 1), enabling accurate measurement in bridge-based transducer interfaces such as strain gage amplifiers.
For engineers reviewing the AD8422ARZ datasheet, AD8422ARZ pinout, AD8422ARZ application, or AD8422ARZ equivalent, key selection criteria include its 368 µA quiescent current, ±2.3 V to ±18 V dual-supply operation, 2.2 MHz bandwidth (G = 1), gain range of 1–1000 via external resistor, and SOIC_N package compatibility with industrial and medical data acquisition systems.
Technical Context
The AD8422ARZ implements a classic 3-op-amp instrumentation amplifier topology with laser-trimmed resistors, delivering <0.01% gain error (G = 1000) and 150 dB CMRR at G = 1000. Its superbeta input transistors achieve 0.5 nA max input bias current and 200 GΩ||2 pF input impedance, supporting high-source-impedance sensors without significant error.
Input overvoltage protection allows ±40 V differential tolerance relative to opposite supply rail, preserving noise performance. The reference pin enables precise output offset adjustment, and the gain-setting architecture (G = 1 + 19.8 kΩ/RG) supports stable, predictable scaling across temperature (−40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 368 µA max - enables high-channel-count, battery-powered, or thermally constrained designs without excessive self-heating. |
| Input Voltage Noise | 8 nV/√Hz at 1 kHz - ensures minimal signal degradation in low-level Wheatstone bridge outputs. |
| CMRR (G = 1) | 86 dB min DC–60 Hz, 80 dB min at 10 kHz - maintains accuracy in noisy industrial environments with common-mode interference. |
| Bandwidth (G = 1) | 2.2 MHz - supports fast-sampling precision DAQ systems up to ~200 kSPS with adequate settling. |
| Gain Range | 1 to 1000 via external RG resistor - provides flexible signal scaling without changing IC, simplifying BOM management. |
| Input Offset Drift | 0.4 µV/°C max - reduces thermal-induced baseline drift in uncalibrated field-deployed instrumentation. |
| Rail-to-Rail Output | Swings within 200 mV of rails (RL = 10 kΩ, ±15 V) - maximizes dynamic range into single-supply ADCs or low-voltage logic interfaces. |
Pinout & Package
AD8422ARZ is housed in an 8-lead SOIC_N (R-8) package with exposed pad (EPAD), rated for −40°C to +85°C operation and θJA = 113°C/W on a 4-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative input terminal | Differential input node; accepts signals referenced to system ground or floating bridges; protected to ±40 V from opposite supply. |
| 2, 3 (RG) | Gain-setting terminals | Resistor connection points defining gain per G = 1 + 19.8 kΩ/RG; minimum RG = 19.8 Ω; no other connections permitted. |
| 4 (+IN) | Positive input terminal | Differential input node; matched to −IN for CMRR optimization; same overvoltage rating and impedance. |
| 5 (−VS) | Negative power supply | Reference for internal circuitry; EPAD should be connected to this pin for optimal thermal and EMI performance. |
| 6 (REF) | Reference voltage input | DC offset control point; drives output level shift (e.g., to match unipolar ADC input range); requires <1 Ω source impedance. |
| 7 (VOUT) | Amplified output | Rail-to-rail output capable of driving 10 kΩ loads; includes short-circuit protection and load-dependent swing limits. |
| 8 (+VS) | Positive power supply | Primary positive rail; supports single-supply (4.6–36 V) or dual-supply (±2.3–±18 V) configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Low power consumption | 368 µA max quiescent current enables >10-year battery life in portable instrumentation with multi-channel sensing. |
| Input overvoltage protection | ±40 V tolerance relative to opposite supply rail preserves functionality during sensor cable faults or ESD events without external clamping. |
| Laser-trimmed precision | 0.04% max gain error (G = 1000) and 0.5 ppm nonlinearity (G = 1, 2 kΩ load) eliminate need for system-level calibration in Class I medical devices. |
| Rail-to-rail output stage | Delivers full-scale output swing even at ±2.3 V dual supply, maximizing SNR when interfacing with low-voltage SAR or delta-sigma ADCs. |
| High input impedance | 200 GΩ differential and common-mode impedance minimizes loading errors when multiplexing high-Z sensors like piezoresistive pressure elements. |
Applications
| Strain Gage Amplifier | Medical ECG Front-End |
|---|---|
|
Use Scenario: Amplifying microvolt-level differential signals from bonded foil or semiconductor strain gages in load cells or torque sensors. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing high CMRR, low noise, and stable gain to reject bridge excitation ripple and ambient EMI. Use Value: 0.15 µV p-p RTI noise (G = 100) and 80 dB CMRR at 10 kHz enable resolution of sub-10 µε mechanical strain without post-acquisition filtering. |
Use Scenario: Conditioning biopotential signals from dry or gel electrodes in portable ECG monitors with strict power and size constraints. IC Role / Device Role / Timing Role: First-stage signal conditioner rejecting 50/60 Hz mains interference while preserving ST-segment morphology and R-wave amplitude fidelity. Use Value: 368 µA quiescent current and rail-to-rail output allow direct interface to 3.3 V ADCs, reducing system power by >40% versus legacy in-amps. |
| Industrial Process Controller Input | Portable Data Logger Channel |
|
Use Scenario: Accepting 4–20 mA loop-powered sensor outputs or millivolt-level thermocouple signals in PLC analog input modules. IC Role / Device Role / Timing Role: Isolated or non-isolated signal conditioner converting sensor outputs to ratiometric or calibrated voltage ranges for microcontroller ADC sampling. Use Value: ±40 V input overvoltage protection eliminates need for external TVS diodes in harsh factory environments with frequent wiring faults. |
Use Scenario: Multi-channel environmental monitoring (temperature, humidity, pressure) in battery-operated field loggers requiring >1-year deployment. IC Role / Device Role / Timing Role: Low-power, high-accuracy front-end amplifier enabling simultaneous sampling of 8+ sensors with <10 ppm total harmonic distortion. Use Value: 0.3 µV/°C max input offset drift ensures <1 LSB error over full industrial temperature range without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8421ARMZ | Higher quiescent current (1.2 mA), wider supply range (±2.5 V to ±18 V), lower input bias current (100 pA typ), but higher input voltage noise (11 nV/√Hz). | Better suited for ultra-high-Z pH or ion-selective electrodes where bias current dominates error; less optimal for low-noise bridge apps. | Select AD8421ARMZ only when input bias current <100 pA is mandatory and power budget allows >3× higher current. |
| INA826AIDR | Lower quiescent current (200 µA), integrated gain resistors (G = 10, 100, 1000), but reduced CMRR (100 dB @ G = 1000) and no overvoltage protection. | Ideal for cost-sensitive, fixed-gain industrial sensors where layout space is limited and external fault protection is added separately. | Choose INA826AIDR for simplified design with known, stable gain; avoid when input fault robustness or variable gain is required. |
Compared with AD8422ARZ, AD8421ARMZ trades noise and power for ultra-low bias current, while INA826AIDR sacrifices overvoltage protection and CMRR for integration and lower current-making AD8422ARZ the balanced choice for general-purpose precision transducer interfaces demanding reliability, flexibility, and low noise.
Availability
AD8422ARZ is available at Aetrix Electronics and suitable for medical instrumentation, industrial process controls, and portable data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD8422ARZ 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, automotive, communications, and healthcare markets since 1965.
The AD8422 belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, high-accuracy sensor signal conditioning in demanding environments-from portable diagnostics to factory automation.
FAQ
What is the maximum operating temperature range for the AD8422ARZ?
The AD8422ARZ is specified for −40°C to +85°C performance and operates reliably up to +125°C junction temperature. Its SOIC_N package supports industrial ambient conditions, and thermal resistance (θJA = 113°C/W) allows safe operation at full quiescent current under typical PCB layouts. Derating is recommended above 85°C ambient for long-term reliability.
Can the AD8422ARZ operate from a single 5 V supply?
Yes, the AD8422ARZ supports single-supply operation from 4.6 V to 36 V. At 5 V, its input common-mode range extends from −0.8 V to +3.5 V (−VS + 1.2 V to +VS − 1.5 V), and rail-to-rail output swings within 120 mV of each rail into 10 kΩ. This enables direct interfacing with 5 V microcontrollers and ADCs without level-shifting circuitry.
How is gain set on the AD8422ARZ, and what resistor value gives G = 100?
Gain is set by an external resistor (RG) across pins 2 and 3 using G = 1 + 19.8 kΩ/RG. For G = 100, RG = 19.8 kΩ / 99 ≈ 200 Ω. A 1% standard-value 200 Ω resistor achieves nominal gain; total system gain accuracy depends on RG tolerance and tempco, not just the AD8422ARZ's intrinsic 0.2% gain error at G = 100.
Does the AD8422ARZ require external protection diodes on its inputs?
No. The AD8422ARZ integrates robust input overvoltage protection allowing continuous ±40 V differential input voltage relative to the opposite supply rail-e.g., +IN can safely reach −VS + 40 V. This eliminates external TVS diodes in most industrial and medical applications, reducing BOM count and PCB area without compromising noise or accuracy.
What is the purpose of the REF pin on the AD8422ARZ, and how should it be used?
The REF pin sets the output voltage offset: VOUT = G × (V+IN − V−IN) + VREF. It enables level shifting-for example, tying REF to 1.65 V centers a 3.3 V ADC's input range. To preserve accuracy, drive REF with a low-impedance source (<1 Ω), and ensure voltage stays within ±0.3 V of either supply rail to avoid forward-biasing internal ESD diodes.
AD8422ARZ 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:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.8V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2.2 MHz
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 60 µV
- Current - Supply:
- 300µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 4.6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8422ARZ FAQ
1.How can I place an order for AD8422ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8422ARZ 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 AD8422ARZ reliable?
The price and inventory of AD8422ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8422ARZ is usually 5 days.
3.What payment methods are accepted for AD8422ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8422ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8422ARZ?
AD8422ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8422ARZ 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 AD8422ARZ?
For technical support, including AD8422ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8422ARZ requirements.
6.How does Aetrix verify that AD8422ARZ is sourced from the original manufacturer or authorized distributors?
All AD8422ARZ 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 AD8422ARZ meets industry standards.
7.What is the process for return or replacement of AD8422ARZ?
All AD8422ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8422ARZ, 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 AD8422ARZ part is unused and in its original packaging.
Return procedure for AD8422ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD8422ARZ Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
