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Analog Devices Inc. AD8422ACPZ-R7
- Part No.:
- AD8422ACPZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WDFN Exposed Pad, CSP
- Datasheet:
-
AD8422ACPZ-R7.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,676
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Product details
Overview
AD8422ACPZ-R7 from Analog Devices is a high-precision, low-power, rail-to-rail instrumentation amplifier optimized for bridge sensor signal conditioning. It delivers 8 nV/√Hz input voltage noise at 1 kHz, 0.15 µV p-p RTI noise (G = 100), and 150 dB CMRR at G = 1000, operating from ±2.3 V to ±18 V dual supply or 4.6 V to 36 V single supply. It is used in medical instrumentation, strain gage interfaces, and portable precision data acquisition systems.
For engineers reviewing the AD8422ACPZ-R7 datasheet, AD8422ACPZ-R7 pinout, AD8422ACPZ-R7 application, or AD8422ACPZ-R7 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for industrial and medical OEM designs.
Technical Context
The AD8422ACPZ-R7 implements a classic 3-op-amp instrumentation amplifier topology with laser-trimmed resistors, enabling <0.01% gain error (G = 1000) and >146 dB CMRR (G = 1000). Its superbeta input transistors deliver 0.5 nA max input bias current and 200 GΩ||2 pF input impedance, supporting high-source-impedance sensors without error degradation.
It features robust input overvoltage protection (±40 V from opposite rail), rail-to-rail output swing (−VS + 0.2 V to +VS − 0.2 V, RL = 10 kΩ), and a reference terminal that enables precise output offset adjustment - critical for unipolar ADC interfacing. Gain is set by a single external resistor (RG) using G = 1 + 19.8 kΩ/RG.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | ±2.3 V to ±18 V dual or 4.6 V to 36 V single - supports wide industrial and battery-powered operation. |
| Quiescent Current | 338–368 µA - enables high-channel-count systems and portable instrumentation with minimal power budget impact. |
| Input Voltage Noise | 8 nV/√Hz at 1 kHz - preserves signal integrity in low-level Wheatstone bridge measurements. |
| CMRR (G = 1000) | 146–150 dB - rejects common-mode interference in noisy industrial environments without calibration. |
| Gain Range | 1 to 1000 via external RG resistor - allows flexible system-level gain scaling without redesigning front-end stages. |
| Input Offset Drift | 0.3 µV/°C max - ensures stable DC accuracy across −40°C to +125°C operating range. |
| Output Swing (RL = 10 kΩ) | −VS + 0.2 V to +VS − 0.2 V - maximizes dynamic range when driving 16-bit+ ADCs directly. |
Pinout & Package
AD8422ACPZ-R7 is housed in an 8-lead LFCSP (CP-8-19) package with exposed pad. This thermally enhanced leadless package offers θJA = 55°C/W and supports high-reliability, space-constrained applications including portable medical devices and industrial sensors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative Input Terminal | Differential input node; accepts signals up to ±40 V beyond opposite supply rail with no damage or performance loss. |
| 2, 3 (RG) | Gain Setting Terminals | Resistor connection points defining gain per G = 1 + 19.8 kΩ/RG; minimum RG = 19.8 Ω. |
| 4 (+IN) | Positive Input Terminal | Differential input node; matched to −IN for optimal CMRR and bias current cancellation. |
| 5 (−VS) | Negative Power Supply | Connects to negative rail; exposed pad (EPAD) should be tied to −VS for optimal thermal and EMI performance. |
| 6 (REF) | Reference Voltage Terminal | Low-impedance (<1 Ω recommended) offset control point; shifts output voltage without affecting gain or CMRR. |
| 7 (VOUT) | Amplified Output Terminal | Rail-to-rail output capable of driving 2 kΩ loads while maintaining linearity and settling time specifications. |
| 8 (+VS) | Positive Power Supply | Connects to positive rail; supplies internal bias networks and output stage. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Delivers full-scale swing to within 200 mV of rails (RL = 10 kΩ), maximizing ADC utilization in single-supply systems. |
| Input overvoltage protection | Withstands continuous ±40 V input differential from opposite supply - eliminates need for external clamping diodes in harsh environments. |
| Laser-trimmed gain resistors | Enables 0.04% max gain error at G = 1000, reducing system calibration burden in precision measurement equipment. |
| Ultra-low input bias current | 0.5 nA max enables direct multiplexing of multiple high-impedance sensors (e.g., thermopiles, pH electrodes) without signal corruption. |
| High CMRR over frequency | 80 dB minimum at 10 kHz (G = 1) - maintains rejection of switching power supply noise and RF interference in real-world layouts. |
Applications
| Medical Instrumentation | Strain Gage Interfaces |
|---|---|
Use Scenario: Amplifying microvolt-level signals from ECG electrodes or pressure transducers in portable patient monitors. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing differential gain, common-mode rejection, and output level shifting for ADC input. Use Value: 0.15 µV p-p RTI noise (G = 100) and 150 dB CMRR ensure diagnostic-grade signal fidelity without post-processing correction. |
Use Scenario: Conditioning full-bridge outputs in load cells and torque sensors for factory automation feedback loops. IC Role / Device Role / Timing Role: Bridge amplifier with programmable gain and rail-to-rail output compatible with 3.3 V or 5 V ADC references. Use Value: 0.5 ppm nonlinearity (G = 1) and 0.3 µV/°C offset drift maintain metrological accuracy across temperature and mechanical stress cycles. |
| Industrial Process Controls | Precision Data Acquisition Systems |
Use Scenario: Signal conditioning for 4–20 mA loop-powered transmitters in hazardous-area process monitoring. IC Role / Device Role / Timing Role: Low-power (368 µA), high-CMRR front-end amplifier interfacing with isolated analog inputs and microcontrollers. Use Value: Wide 4.6–36 V single-supply range and ±40 V input overvoltage tolerance simplify power architecture and eliminate external protection components. |
Use Scenario: Multi-channel simultaneous sampling systems requiring matched gain, offset, and noise performance across channels. IC Role / Device Role / Timing Role: Channel-isolated instrumentation amplifier with identical pinout and specs across SOIC, MSOP, and LFCSP variants. Use Value: 0.04% gain error (G = 1000) and 146 dB CMRR enable channel-to-channel matching better than 0.01% without trimming. |
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 bandwidth (3.5 MHz at G = 1), but lower CMRR (130 dB at G = 1000). | Better suited for high-speed, high-gain applications where power is less constrained. | Select AD8421ARMZ only if bandwidth >2.2 MHz is required and 368 µA quiescent current is insufficient for system thermal or battery life goals. |
| INA128UA | Higher input offset (125 µV typ), higher noise (12 nV/√Hz), and lower CMRR (120 dB at G = 1000); SOIC-8 only. | Cost-optimized for non-critical industrial sensing where 16-bit resolution is not mandatory. | Choose INA128UA only for legacy designs or cost-sensitive applications where AD8422ACPZ-R7's 0.15 µV p-p noise and 150 dB CMRR are not required. |
Compared with AD8421ARMZ and INA128UA, AD8422ACPZ-R7 uniquely balances ultra-low power (368 µA), industry-leading CMRR (150 dB), and sub-µV noise in a thermally efficient LFCSP package - making it the preferred choice for portable, high-accuracy, and thermally constrained instrumentation.
Availability
AD8422ACPZ-R7 is available at Aetrix Electronics and suitable for medical instrumentation, industrial process controls, and precision data acquisition systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD8422ACPZ-R7 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 technologies, serving industrial, automotive, communications, and healthcare markets.
The AD8422 belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-noise, low-power, high-accuracy sensor signal conditioning in demanding environments - from portable diagnostics to factory-floor automation.
FAQ
What is the maximum operating temperature range for AD8422ACPZ-R7?
The AD8422ACPZ-R7 is specified for −40°C to +125°C operation, with guaranteed performance across this full range. Its LFCSP package and internal thermal design support reliable function in high-temperature industrial enclosures and automotive under-hood applications. The datasheet confirms CMRR, offset drift, and quiescent current remain within limits up to +125°C.
Does AD8422ACPZ-R7 require external components for basic operation?
Yes - AD8422ACPZ-R7 requires an external resistor (RG) between Pins 2 and 3 to set gain per G = 1 + 19.8 kΩ/RG. For G = 1, no RG is needed. A low-impedance source (<1 Ω) is also required on Pin 6 (REF) if output offset adjustment is used. No compensation capacitors or external bias networks are required for stability or DC accuracy.
Can AD8422ACPZ-R7 drive a 2 kΩ load while maintaining rail-to-rail output swing?
Yes - AD8422ACPZ-R7 delivers rail-to-rail output swing into 2 kΩ loads: −VS + 0.25 V to +VS − 0.25 V at ±15 V supply (25°C), degrading only slightly to −VS + 0.3 V/+VS − 1.4 V at cold temperatures. This capability enables direct interface with standard op-amp buffers or ADC drivers without additional gain stages.
How does the input overvoltage protection of AD8422ACPZ-R7 work?
AD8422ACPZ-R7 incorporates integrated input protection that safely withstands continuous voltages up to 40 V beyond the opposite supply rail (e.g., +IN at −VS + 40 V). This is achieved without external diodes or resistors, preserving its 8 nV/√Hz noise performance and 200 GΩ input impedance - critical for high-fidelity sensor front-ends.
Is AD8422ACPZ-R7 pin-compatible with other AD8422 variants like AD8422ARMZ or AD8422ARZ?
No - AD8422ACPZ-R7 uses an 8-lead LFCSP (CP-8-19) package, while AD8422ARMZ is in MSOP-8 (RM-8) and AD8422ARZ is in SOIC_N-8 (R-8). Though all share identical pin functions and electrical specs, their footprints and thermal characteristics differ. PCB layout must match the specific package; no mechanical interchangeability exists.
AD8422ACPZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- 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:
- 70 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LFCSP (3x3)
AD8422ACPZ-R7 FAQ
1.How can I place an order for AD8422ACPZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8422ACPZ-R7 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 AD8422ACPZ-R7 reliable?
The price and inventory of AD8422ACPZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8422ACPZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8422ACPZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8422ACPZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8422ACPZ-R7?
AD8422ACPZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8422ACPZ-R7 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 AD8422ACPZ-R7?
For technical support, including AD8422ACPZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8422ACPZ-R7 requirements.
6.How does Aetrix verify that AD8422ACPZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8422ACPZ-R7 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 AD8422ACPZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8422ACPZ-R7?
All AD8422ACPZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8422ACPZ-R7, 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 AD8422ACPZ-R7 part is unused and in its original packaging.
Return procedure for AD8422ACPZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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