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Analog Devices Inc. AD8669ARZ
- Part No.:
- AD8669ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8669ARZ.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,044
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Product details
Overview
AD8669ARZ from Analog Devices is a quad, rail-to-rail output, precision CMOS operational amplifier optimized for low-noise, low-input-bias-current sensor signal conditioning. It delivers 175 µV max offset voltage, 23 nV/√Hz voltage noise, 300 fA typical input bias current, and operates from 5 V to 16 V single supply across −40°C to +125°C. It is used in pH meters, photodiode transimpedance amplifiers, and medical diagnostic front ends.
For engineers reviewing the AD8669ARZ datasheet, AD8669ARZ pinout, AD8669ARZ application, or AD8669ARZ equivalent, this page provides verified specifications, SOIC-14 package details, real-world use cases in high-impedance sensing, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The AD8669ARZ implements Analog Devices' DigiTrim® trimming for stable low offset (≤175 µV) and low drift (1.5–5 µV/°C) over temperature. Its CMOS input stage enables femtoampere-level bias current (0.3 pA typ), critical for electrometer-grade applications like pH/ORP probes and photodiode amplification.
It supports rail-to-rail output swing (e.g., 15.95 V high / 17 mV low at 100 µA load with 16 V supply), unity-gain stability, and 540 kHz gain bandwidth-enabling precision DC-coupled gain stages and low-power ADC drivers without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 16 V single supply - supports industrial and medical systems operating beyond standard 5 V rails without dual supplies. |
| Input Offset Voltage | 30–175 µV max @ 25°C - enables accurate DC amplification in strain gauge or thermopile interfaces without manual nulling. |
| Input Bias Current | 0.3 pA typ, ≤120 pA over −40°C to +125°C - preserves signal integrity in >1 GΩ sensor paths (e.g., glass pH electrodes). |
| Voltage Noise Density | 23 nV/√Hz @ 1 kHz - minimizes noise contribution in low-frequency (<10 kHz) sensor front ends like IR thermometers. |
| Gain Bandwidth Product | 540 kHz @ VSY = 16 V - sufficient for stable closed-loop gain ≥10 in precision instrumentation filters and buffer stages. |
| Output Swing (16 V) | 15.95 V high / 17 mV low @ 100 µA - delivers full dynamic range into 12-bit+ SAR ADCs with minimal headroom loss. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive sensors, industrial PLC I/O modules, and portable medical devices. |
Pinout & Package
AD8669ARZ is packaged in a 14-lead narrow-body SOIC (R-14), 8.75 mm × 4.00 mm body, 1.75 mm height, RoHS-compliant. Exposed pad is not present in this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives downstream ADC input or active filter stage with rail-to-rail swing. |
| 2 | –IN A | Inverting input of Amp A - connects to feedback network in transimpedance or difference amplifier configurations. |
| 3 | +IN A | Non-inverting input of Amp A - ties to high-impedance sensor node (e.g., pH probe reference electrode). |
| 4 | V– | Negative supply pin - grounded in single-supply operation; must be decoupled with 0.1 µF ceramic capacitor. |
| 5 | +IN B | Non-inverting input of Amp B - independent channel for dual-sensor monitoring (e.g., temperature-compensated pH system). |
| 6 | –IN B | Inverting input of Amp B - used for matched gain/offset calibration path alongside Amp A. |
| 7 | OUT B | Amplifier B output - provides second analog channel without cross-talk (channel separation >120 dB @ 1 kHz). |
| 8 | OUT C | Amplifier C output - enables three-channel simultaneous acquisition (e.g., multi-parameter environmental sensor). |
| 9 | –IN C | Inverting input of Amp C - accepts differential input from bridge-based pressure transducers. |
| 10 | +IN C | Non-inverting input of Amp C - referenced to stable mid-rail voltage for true differential sensing. |
| 11 | V– | Shared negative supply - common return for all four amplifiers; requires low-impedance ground plane. |
| 12 | +IN D | Non-inverting input of Amp D - dedicated channel for REF buffer or DAC output amplification. |
| 13 | –IN D | Inverting input of Amp D - configured as unity-gain follower for high-accuracy voltage reference buffering. |
| 14 | OUT D | Amplifier D output - delivers low-drift, low-noise buffered reference to multiple ADCs or analog comparators. |
Key Features
| Feature | Design Value |
|---|---|
| DigiTrim® trimming | Factory-laser-trimmed input offset ensures ≤175 µV without external calibration, reducing production test time. |
| Rail-to-rail output | Delivers >99% of supply rail swing at 100 µA load, maximizing usable ADC input range in battery-powered instruments. |
| Femtoampere input bias | 0.3 pA typical bias current prevents voltage error in >10 GΩ source impedances (e.g., electrochemical sensors). |
| Wide supply range | Operates from 5 V to 16 V single supply - eliminates need for charge pumps or LDOs in mixed-voltage industrial systems. |
| Extended temperature grade | Specified from −40°C to +125°C - supports deployment in engine control units, downhole tools, and sterilizable medical hardware. |
Applications
| pH and ORP Meters | Photodiode Transimpedance Amplifiers |
|---|---|
|
Use Scenario: Measuring millivolt-level potential shifts across glass pH electrodes in aqueous solutions, requiring ultra-low input current to avoid polarization errors. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with femtoampere input bias, buffering electrode signal before 24-bit sigma-delta ADC conversion. Use Value: 0.3 pA input bias prevents >10 mV measurement drift over minutes; 175 µV offset enables ±0.01 pH resolution without software correction. |
Use Scenario: Converting nanoampere photocurrent from silicon photodiodes into measurable voltage for optical smoke detectors or spectrophotometers. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier (TIA) with 23 nV/√Hz noise density and unity-gain stability for 100 kΩ–10 MΩ feedback resistors. Use Value: Enables sub-picoampere current detection at 1 Hz bandwidth; rail-to-rail output drives ADC directly without level-shifting circuitry. |
| Medical Diagnostic Instrumentation | Low-Power ADC Drivers |
|
Use Scenario: Signal conditioning for disposable ECG/EEG electrodes in portable patient monitors, where power budget and DC accuracy are constrained. IC Role / Device Role / Timing Role: Quad op amp providing simultaneous lead-I, lead-II, lead-III, and Wilson central terminal amplification with matched gain/offset. Use Value: 275 µA per amplifier supply current allows 4-channel analog front end on <1 mA total; 1.5 µV/°C drift maintains calibration over clinical operating temperatures. |
Use Scenario: Driving the input of 12-bit to 16-bit SAR ADCs in wireless sensor nodes, where settling time and power efficiency determine battery life. IC Role / Device Role / Timing Role: Low-power, rail-to-rail output buffer isolating ADC input from multiplexer switching transients and source impedance variations. Use Value: 540 kHz GBW and 0.3 V/µs slew rate ensure <1 µs settling to 0.001% for 12-bit codes; 275 µA quiescent current extends coin-cell lifetime to >5 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDR | Lower offset (4 µV typ), higher supply current (170 µA per amp), 10 MHz GBW - trades ultra-low bias current (20 fA) for speed and precision. | Better for high-speed precision data acquisition; less suitable for >1 GΩ sensor sources due to higher bias current than AD8669ARZ. | Select OPA2189IDR when offset and drift dominate performance, and sensor impedance is <100 MΩ. |
| LTC6078IS8#PBF | Lower supply current (50 µA per amp), same 300 fA bias, but narrower supply range (2.7–5.5 V) and lower GBW (1.5 MHz). | Ideal for ultra-low-power battery systems (e.g., wearable biosensors); cannot replace AD8669ARZ in 12–16 V industrial designs. | Choose LTC6078IS8#PBF only for sub-5 V, multi-year battery applications where 16 V operation is unnecessary. |
Compared with OPA2189IDR and LTC6078IS8#PBF, AD8669ARZ uniquely balances femtoampere input bias, 16 V operation, and extended temperature range - making it irreplaceable in high-voltage, high-impedance, wide-temperature industrial and medical sensor interfaces.
Availability
AD8669ARZ is available at Aetrix Electronics and suitable for pH/ORP meter manufacturing, photodiode-based optical sensing, and medical diagnostic instrument design requiring stable component supply across long production lifecycles.
Supply support for AD8669ARZ 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 AD866x family was designed specifically for precision, low-power, high-impedance sensor signal conditioning in industrial, medical, and scientific instrumentation - emphasizing DigiTrim®-enabled offset stability and femtoampere input bias.
FAQ
What is the maximum supply voltage for AD8669ARZ?
The AD8669ARZ has an absolute maximum supply voltage rating of 18 V, with recommended operation up to 16 V. Operating at 16 V enables full rail-to-rail output swing (15.95 V high / 17 mV low at 100 µA), critical for maximizing dynamic range in 12-bit+ ADC interfaces. Exceeding 18 V risks permanent damage per the Absolute Maximum Ratings table.
Does AD8669ARZ support single-supply operation?
Yes, AD8669ARZ is fully specified for single-supply operation from 5 V to 16 V. Its rail-to-rail output stage and input common-mode range extending to within 0.2 V of V– allow direct interfacing with microcontroller ADCs and low-voltage references without level-shifting circuitry - a key enabler for portable and battery-powered AD8669ARZ-based designs.
What is the input bias current specification for AD8669ARZ over temperature?
AD8669ARZ specifies input bias current of 0.3 pA typical at 25°C, rising to ≤120 pA over the full −40°C to +125°C operating range. This femtoampere-level performance is maintained via its CMOS input architecture and is essential for minimizing voltage error in high-impedance sensor circuits such as pH electrodes and photodiode TIAs - directly confirmed in Table 2 of the Rev. D datasheet.
Is AD8669ARZ pin-compatible with other AD866x variants?
No - AD8669ARZ (quad, 14-lead SOIC) is not pin-compatible with AD8663ARZ (single, 8-lead SOIC) or AD8667ARZ (dual, 8-lead SOIC). Pin counts, pin functions, and package footprints differ fundamentally. The AD8669ARZ pinout is unique to the 14-lead SOIC and TSSOP packages, as shown in Figure 4 of the datasheet; substitution requires PCB layout revision.
What packaging options are available for AD8669ARZ?
AD8669ARZ is offered exclusively in 14-lead SOIC_N (R-14) and 14-lead TSSOP (RU-14) packages per the Ordering Guide. The R-14 variant (AD8669ARZ) measures 8.75 mm × 4.00 mm with 1.27 mm lead pitch; the RU-14 variant (AD8669ARUZ) is smaller at 5.00 mm × 4.40 mm. Both are RoHS-compliant and rated for −40°C to +125°C operation.
AD8669ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- DigiTrim®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- 540 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.3 pA
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 230µA (x4 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
AD8669ARZ FAQ
1.How can I place an order for AD8669ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8669ARZ 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 AD8669ARZ reliable?
The price and inventory of AD8669ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8669ARZ is usually 5 days.
3.What payment methods are accepted for AD8669ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8669ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8669ARZ?
AD8669ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8669ARZ 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 AD8669ARZ?
For technical support, including AD8669ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8669ARZ requirements.
6.How does Aetrix verify that AD8669ARZ is sourced from the original manufacturer or authorized distributors?
All AD8669ARZ 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 AD8669ARZ meets industry standards.
7.What is the process for return or replacement of AD8669ARZ?
All AD8669ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8669ARZ, 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 AD8669ARZ part is unused and in its original packaging.
Return procedure for AD8669ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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