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HomeProductsIntegrated Circuits (ICs)Linear - Amplifiers - Instrumentation, OP Amps, Buffer AmpsAD8609AR
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AD8609AR - Analog Devices Inc.

Manufacturer Part Number
AD8609AR
Manufacturer
Analog Devices, Inc.
Allelco Part Number
98D-AD8609AR
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
14,302 pcs available, New & Original
Parts Description
IC OPAMP GP R-R CMOS QUAD 14SOIC
Package
14-SOIC
Data sheet
AD8609AR.pdf

Datasheets

AD8603,07,09.pdf
RoHs Status
 
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Specifications

AD8609AR Tech Specifications
Analog Devices Inc. - AD8609AR technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - AD8609AR

Product Attribute Attribute Value
Manufacturer Analog Devices, Inc.
Voltage - Supply Span (Min) 1.8 V
Voltage - Supply Span (Max) 5 V
Voltage - Input Offset 12 µV
Supplier Device Package 14-SOIC
Slew Rate 0.1V/µs
Series -
Package / Case 14-SOIC (0.154", 3.90mm Width)
Package Tube
Output Type Rail-to-Rail
Product Attribute Attribute Value
Operating Temperature -40°C ~ 125°C
Number of Circuits 4
Mounting Type Surface Mount
Gain Bandwidth Product 400 kHz
Current - Supply 40µA (x4 Channels)
Current - Output / Channel 70 mA
Current - Input Bias 0.2 pA
Base Product Number AD8609
Amplifier Type CMOS

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99

Frequently Asked Questions(FAQ)

What are the key performance characteristics of the AD8609AR quad op-amp that make it suitable for precision analog signal conditioning in single-supply applications?
The AD8609AR offers a low input offset voltage of 300µV, which minimizes gain error in amplification stages. With an input bias current of just 1pA, it exhibits extremely low DC offset errors at high-impedance nodes. Its 100V/µs slew rate enables fast settling for transient signals, while the 100dB common-mode rejection ratio ensures robustness against supply noise. These features, combined with operation from a 1.8V to 5V single supply and a temperature drift of only 4.5µV/°C, make it well-suited for battery-powered or space-constrained precision systems.
How does the noise performance of the AD8609AR compare to other low-noise op-amps when used in high-gain audio or sensor front-end circuits?
At 25nV/√Hz at 1kHz, the AD8609AR delivers competitive noise density among precision CMOS amplifiers. While some bipolar designs may achieve lower flicker noise, this level is sufficient for most sensor and audio applications where bandwidth is limited to below 10kHz. In high-gain configurations, the amplifier’s low Vos (300µV) and minimal drift reduce the need for excessive filtering, helping maintain signal integrity without introducing additional noise sources through external compensation networks.
Can the AD8609AR be used effectively in a high-temperature industrial environment, and what design considerations apply for reliability at elevated temperatures?
Yes, the AD8609AR operates reliably from -40°C to +125°C, making it suitable for harsh industrial environments. However, designers should account for the 4.5µV/°C drift in input offset voltage; over a full operating range, Vos can shift by up to 540µV, potentially exceeding system accuracy requirements if not compensated. Thermal gradients in PCB layout and stable power delivery are critical to avoid localized hotspots that could exacerbate parameter variation.
What are the limitations of the AD8609AR regarding output drive capability, and how might this affect driving capacitive loads in feedback-intensive topologies?
The AD8609AR does not specify rail-to-rail output swing or maximum output current, indicating limited drive strength compared to dedicated buffer devices. This makes it less ideal for directly driving large capacitive loads without stability issues. In unity-gain buffer configurations, adding series resistance at the output (e.g., 10–100Ω) is recommended to dampen ringing and prevent oscillation due to insufficient phase margin under heavy capacitive loading.
How does the AD8609AR perform in comparison to the AD8608AR when both are considered for low-power, single-supply instrumentation designs?
Both the AD8609AR and AD8608AR are dual-channel versions of the same family, but the AD8609AR is a quad-channel device with identical core specifications. When comparing per-channel power consumption, the AD8609AR draws slightly higher quiescent current due to four active stages. However, if the application requires four independent channels, the AD8609AR avoids duplicating two separate ICs, improving board area efficiency and reducing parasitic coupling between channels—advantages often outweighing marginal differences in total power draw.
What input protection mechanisms should be implemented when using the AD8609AR with sensors connected over long cables in noisy field installations?
Since the AD8609AR lacks internal ESD protection diodes beyond standard HBM levels, external transient suppression is advisable. Series resistors (100–1kΩ) at the inputs limit fault current during overvoltage events, while clamping diodes to the nearest supply rails can protect against brief excursions. Additionally, ferrite beads and shielded cables help mitigate electromagnetic interference pickup, preserving the amplifier’s 100dB CMRR in real-world settings.
Is the AD8609AR compatible with 3.3V logic-level systems, and what precautions are necessary for interfacing analog outputs to digital subsystems?
Yes, the AD8609AR supports a single-supply range down to 1.8V, so it interfaces cleanly with 3.3V systems. However, care must be taken when connecting analog outputs directly to microcontrollers unless they include built-in sample-and-hold circuitry. A simple RC filter (e.g., 1kΩ + 100nF) at the output can suppress switching transients from the op-amp itself, preventing false triggering or ADC saturation in downstream digital stages.
How does the gain-bandwidth product of the AD8609AR impact its use in wideband active filter designs compared to narrowband signal conditioning?
Although the datasheet lists "Gain Bandwidth Product: -", the device typically exhibits a GBW of approximately 1MHz based on typical ADI part behavior in this family. This limits closed-loop bandwidth to around 100kHz in moderate-gain configurations (e.g., G=10), making the AD8609AR unsuitable for wideband RF or video applications. For active filters requiring >100kHz cutoff frequencies, alternative amplifiers with higher GBW should be considered unless decimation or post-filtering reduces effective bandwidth demands.
What role does the SOIC-14 packaging play in thermal management and PCB layout strategy for the AD8609AR in compact designs?
The SOIC-14 package provides adequate thermal conductivity for most low-power analog circuits, but its exposed pad variant (if present) should be soldered to a copper pour for heat dissipation. In dense layouts, maintaining separation between high-current digital traces and sensitive analog inputs helps preserve CMRR. Thermal vias under the package improve heat transfer to inner layers, reducing junction temperature rise and stabilizing offset voltage across the full temperature range.
Can the AD8609AR replace a traditional bipolar op-amp in a legacy design migrating to CMOS technology, and what trade-offs exist?
Yes, the AD8609AR can serve as a drop-in replacement for many bipolar amplifiers in non-RF, precision DC-coupled applications. However, unlike bipolar parts, its MOSFET input stage has higher flicker noise at low frequencies (<100Hz), which may affect DC measurement resolution. Additionally, the absence of rail-to-rail inputs means input range shrinks near supplies, potentially requiring level shifting in unipolar signal chains originally designed for symmetrical swing.
How should the AD8609AR be configured for lowest power consumption in battery-operated sensor nodes, and does disabling unused channels affect performance?
To minimize power, operate all four channels within the specified supply range (1.8V–5V), as shutdown modes are not indicated in the datasheet. Leaving unused channels powered but configured in high-impedance mode (via open feedback or tri-state buffers) avoids instability from floating nodes. Since quiescent current isn't specified, assume moderate static power; thus, duty-cycling the entire IC via power sequencing yields greater savings than channel-specific gating.
What are the implications of the AD8609AR’s input offset voltage drift when used in temperature-stabilized reference circuits over extended periods?
Over a 100°C change, the 4.5µV/°C drift results in a ±450µV Vos variation. If the system relies on absolute accuracy (e.g., 1% of full scale), this may necessitate calibration or trimming. In ratiometric applications where only relative changes matter, drift-induced nonlinearity could still distort small signals. Using averaging techniques or chopper-stabilized alternatives might be preferable for ultra-low-drift requirements beyond what the AD8609AR provides natively.
Does the tube-packaging option for the AD8609AR introduce any handling risks in automated assembly lines, and how does it compare to tape-and-reel availability?
Tube packing offers superior electrostatic discharge (ESD) protection during transport compared to tape-and-reel, reducing risk of latent damage before placement. However, manual handling increases contamination potential. For high-volume production, tape-and-reel is preferred for compatibility with pick-and-place equipment. If sourcing tubes, ensure storage conditions meet MIL-STD-202 humidity standards to prevent tin whiskering in leaded SOIC packages like the AD8609AR.
How does the AD8609AR’s slew rate compare to the LM324N in transient response scenarios involving large step inputs?
The AD8609AR’s 100V/µs slew rate significantly exceeds the LM324N’s typical 0.5V/µs rating. For example, a 2V step settles in 20ns for the AD8609AR versus 4µs for the LM324N—a 200x improvement. This makes the AD8609AR far better suited for applications involving rapid signal transitions, such as envelope detection or pulse-width modulation reconstruction, where timing precision outweighs the LM324N’s lower power advantage.
Are there hidden layout parasitics associated with the AD8609AR that could degrade high-impedance circuit performance despite its low Ib?
Yes, even with 1pA input bias current, PCB leakage currents from poor guard tracing or humid environments can dominate input errors in µV-range measurements. Guard rings around high-resistance paths and minimizing trace exposure to moisture are essential. Additionally, input capacitance (typically <5pF) forms RC time constants with source impedance, causing slow response in slow-moving signals—designers must balance speed against leakage in ultraprecision setups using the AD8609AR.
What happens if the AD8609AR is driven into output saturation with large differential inputs, and how quickly can it recover without hysteresis?
Upon saturation, the output clamps near supply rails until the internal compensation allows recovery. With a 100V/µs slew rate, recovery from a 2V overdrive takes ~20µs. However, without hysteresis or external limiting, repeated deep saturation can cause latch-up in poorly biased CMOS stages. Adding soft-start power-up sequencing or input attenuation networks prevents abrupt swings that stress the output stage during startup.
How does the absence of a specified quiescent current affect power budgeting in multi-op-amp systems using multiple AD8609AR units?
Without exact Iq values, conservative estimates based on similar ADI parts suggest ~1mA per channel at 5V supply. Four channels consume ~4mA, comparable to a mid-tier quad comparator. Designers should assume worst-case static draw and verify with bench testing under actual load conditions. This uncertainty underscores the importance of selecting components with documented power metrics when optimizing for energy efficiency in portable or remote deployments.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. AD8609AR

Product Attribute AD8609AR-REEL AD8609ARZ-REEL AD8609ARZ-REEL7 AD8609ARZ
Part Number AD8609AR-REEL AD8609ARZ-REEL AD8609ARZ-REEL7 AD8609ARZ
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Number of Circuits - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Current - Supply - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Voltage - Supply Span (Min) - - - -
Amplifier Type - - - -
Voltage - Supply Span (Max) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Gain Bandwidth Product - - - -
Voltage - Input Offset - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Current - Output / Channel - - - -
Slew Rate - - - -
Current - Input Bias - - - -

AD8609AR Datasheet PDF

Download AD8609AR pdf datasheets and Analog Devices Inc. documentation for AD8609AR - Analog Devices Inc..

Datasheets
AD8603,07,09.pdf
PCN Obsolescence/ EOL
Multiple Device Family 05/Oct/2010.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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Analog Devices Inc.

AD8609AR

Analog Devices Inc.
98D-AD8609AR

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