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Analog Devices Inc. AD8655ARZ
- Part No.:
- AD8655ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8655ARZ.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,639
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Product details
Overview
AD8655ARZ from Analog Devices is a single-channel, low-noise (2.7 nV/√Hz at 10 kHz), precision CMOS operational amplifier with rail-to-rail input/output, 28 MHz gain bandwidth, and 250 µV max offset voltage over common-mode range - designed for high-resolution ADC/DAC buffering in automotive collision avoidance and industrial control systems.
For engineers reviewing the AD8655ARZ datasheet, AD8655ARZ pinout, AD8655ARZ application, or AD8655ARZ equivalent, key selection criteria include its −40°C to +125°C automotive-qualified operation, sub-pA input bias current (1 pA typ), 0.4 µV/°C offset drift, and SOIC_N-8 package compatibility with precision signal conditioning in low-voltage (2.7 V–5.5 V) analog front-ends.
Technical Context
The AD8655ARZ employs Analog Devices' DigiTrim® post-package trimming to achieve high DC accuracy without sacrificing rail-to-rail input stage performance. Its voltage-feedback architecture delivers unity-gain stability, 110 dB open-loop gain (RL = 10 kΩ), and no phase reversal across the full supply rail range.
It operates from 2.7 V to 5.5 V, supports ±220 mA output drive at 5 V, and maintains 69° phase margin with 11 V/µs slew rate - enabling stable, high-fidelity amplification in fast-settling data acquisition and audio preamp circuits where low THD+N (0.0007%) and wide dynamic range are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise Density | 2.7 nV/√Hz at 10 kHz - enables high-SNR signal chain design in microphone preamps and sensor interfaces. |
| Offset Voltage (max) | 250 µV over VCM - ensures ≤0.005% gain error in 5 V full-scale precision measurement systems. |
| Gain Bandwidth Product | 28 MHz - supports stable closed-loop operation up to 10× gain with >2.5 MHz small-signal bandwidth. |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with single-supply battery-powered and automotive 3.3 V/5 V systems. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive applications and industrial process controls. |
| Input Bias Current | 1 pA typical - allows use of high-impedance sensor sources (e.g., piezoelectric, pH electrodes) without significant error. |
| THD + Noise | 0.0007% at 1 kHz - preserves audio fidelity and minimizes harmonic distortion in active filters and mixing consoles. |
Pinout & Package
AD8655ARZ is housed in an 8-lead SOIC_N (R-8) package, RoHS-compliant, with standard op amp pinout and two no-connect (NC) pins for layout flexibility and noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | Internally unconnected; may be left floating or tied to ground for EMI reduction. |
| 2 | Inverting Input (−IN) | Differential input node; accepts signals within rail-to-rail common-mode range (0 V to V+). |
| 3 | Non-Inverting Input (+IN) | Differential input node; supports high-impedance sensing with 1 pA bias current. |
| 4 | Negative Supply (V−) | Ground reference for single-supply operation or negative rail in dual-supply configurations. |
| 5 | No Connect (NC) | Internally unconnected; not used in AD8655 single-amplifier configuration. |
| 6 | Output (OUT) | Rail-to-rail output capable of sourcing/sinking ±220 mA at 5 V, driving 10 kΩ loads to within 30 mV of rails. |
| 7 | Positive Supply (V+) | Primary power input; supports 2.7 V–5.5 V operation with 4.5 mA typical quiescent current. |
| 8 | No Connect (NC) | Internally unconnected; decoupling capacitor placement adjacent improves PSRR above 100 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Low noise architecture | 2.7 nV/√Hz at 10 kHz enables <1 µV RMS integrated noise in 100 kHz bandwidth - critical for 24-bit ADC front-ends. |
| DigiTrim® post-package trimming | Reduces mechanical stress-induced offset drift to 0.4 µV/°C typ - eliminates need for system-level calibration in automotive temperature cycling. |
| Rail-to-rail I/O | Input common-mode extends to both rails; output swings within 30 mV of V+ and 8 mV of V− at 1 mA load - maximizes dynamic range in 3.3 V systems. |
| Automotive qualification | AEC-Q100 Grade 1 compliance (−40°C to +125°C) with PPAP support - suitable for ADAS sensor signal conditioning without derating. |
| Unity-gain stable | Guaranteed stability with capacitive loads ≤200 pF and no external compensation required - simplifies PCB layout in space-constrained modules. |
Applications
| ADC and DAC buffers | Audio preamplifiers |
|---|---|
Use Scenario: Buffering high-impedance outputs of 24-bit SAR ADCs and precision DACs in industrial data loggers. IC Role / Device Role / Timing Role: Precision voltage follower with rail-to-rail swing and low THD+N to preserve SNR and minimize code-dependent errors. Use Value: 250 µV max offset ensures <0.005% full-scale error; 2.7 nV/√Hz noise contributes <0.3 LSB RMS noise in 100 kHz bandwidth. | Use Scenario: Low-noise microphone preamplifier stage in automotive cabin voice recognition systems. IC Role / Device Role / Timing Role: Single-ended gain stage with 28 MHz bandwidth and 0.0007% THD+N for wideband acoustic capture. Use Value: Sub-pA input bias avoids loading electret condenser microphones; −40°C to +125°C rating ensures reliability in parked-car thermal cycles. |
| Automotive collision avoidance | Precision filters |
Use Scenario: Signal conditioning for radar IF amplifiers and ultrasonic parking sensor receivers. IC Role / Device Role / Timing Role: Low-drift, low-noise gain block in analog front-end before high-speed ADC sampling. Use Value: 0.4 µV/°C drift prevents baseline shift during engine heat soak; 11 V/µs slew rate supports 10 MHz pulse response without distortion. | Use Scenario: Active filter stage in digital scale load-cell signal chains requiring stable DC accuracy and low-frequency noise rejection. IC Role / Device Role / Timing Role: High-Gain, low-offset integrator or Sallen-Key stage with minimal drift-induced baseline error. Use Value: 250 µV max offset limits zero-point error to <0.01% of 5 V full-scale; rail-to-rail I/O enables full utilization of 3.3 V supply headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA376AIDBVR | Lower noise (2.5 nV/√Hz), but only 5.5 MHz GBW and 1.5 V/µs slew rate; 0.1 µV/°C drift. | Better for ultra-low-drift DC-coupled sensors; insufficient bandwidth for >100 kHz filter or ADC buffer use. | Select OPA376AIDBVR when drift dominates over speed; avoid for 28 MHz signal paths. |
| LTC6241CS8#PBF | Higher supply current (6.5 mA vs. 4.5 mA), wider supply range (2.8 V–12 V), 20 MHz GBW, 10 V/µs slew rate. | More robust against supply variation; less optimal for battery-powered 3.3 V systems due to higher quiescent draw. | Select LTC6241CS8#PBF when operating above 5.5 V or needing enhanced PSRR; AD8655ARZ preferred for 2.7–5.5 V automotive use. |
Compared with OPA376AIDBVR and LTC6241CS8#PBF, AD8655ARZ uniquely balances 28 MHz bandwidth, 2.7 nV/√Hz noise, and −40°C to +125°C automotive qualification in a SOIC-8 package - making it optimal for high-speed, high-accuracy signal conditioning where thermal stability and rail-to-rail operation are non-negotiable.
Availability
AD8655ARZ is available at Aetrix Electronics and suitable for automotive collision avoidance systems, industrial process controllers, and high-resolution data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8655ARZ 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 AD8655ARZ belongs to Analog Devices' precision CMOS op amp product line, engineered specifically for low-noise, low-drift, rail-to-rail signal conditioning in automotive, industrial, and medical instrumentation where DC accuracy and dynamic performance must coexist.
FAQ
What is the maximum capacitive load the AD8655ARZ can drive without external compensation?
The AD8655ARZ can drive capacitive loads up to 200 pF while maintaining stability without external compensation. For loads exceeding 200 pF - especially above 100 kHz - a snubber network (e.g., series RC at the output) is recommended to suppress ringing and overshoot. The AD8655ARZ datasheet confirms stable operation with ≤500 pF loads but notes significant peaking without damping, so design margins should prioritize the 200 pF limit for robust unity-gain applications.
Does the AD8655ARZ support true rail-to-rail input common-mode voltage?
Yes, the AD8655ARZ supports true rail-to-rail input common-mode voltage, meaning its input stage operates with VCM extending from V− (ground in single-supply) to V+ (up to 5.5 V). This is confirmed in the General Description and Input Voltage Range specification (0 V to 5 V at VS = 5.0 V), enabling direct interfacing with sensors and DACs that swing near supply rails without level-shifting circuitry.
Is the AD8655ARZ pin-compatible with other op amps in the same SOIC-8 package?
The AD8655ARZ uses a standard single-op-amp SOIC-8 pinout (with NC on pins 1, 5, and 8), matching industry-standard configurations like the OP27 or AD8605. However, pin compatibility does not guarantee functional equivalence: its DigiTrim-trimmed offset, 28 MHz bandwidth, and −40°C to +125°C rating differ significantly from legacy parts. Always verify supply range, noise, and thermal specs before substitution.
What is the typical supply current of the AD8655ARZ at 25°C and 5 V supply?
The typical supply current of the AD8655ARZ is 4.5 mA per amplifier at TA = 25°C and VS = 5.0 V, as specified in Table 1 under "Supply Current/Amplifier" (ISY). Over temperature (−40°C to +125°C), this rises to a maximum of 5.3 mA. This quiescent current enables low-power precision performance without sacrificing speed or noise - ideal for always-on automotive subsystems.
How does the AD8655ARZ handle input overvoltage conditions?
The AD8655ARZ includes internal input overvoltage protection diodes rated for ±0.3 V beyond the supply rails. Applying voltages exceeding V− − 0.3 V or V+ + 0.3 V risks damaging the inputs. For higher overvoltage tolerance, external series resistors (e.g., 10 kΩ) are recommended to limit input current to <5 mA, as stated in the Applications Information section - preserving integrity in noisy industrial or automotive environments.
AD8655ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- DigiTrim®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 11V/µs
- Gain Bandwidth Product:
- 28 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 3.7mA
- Current - Output / Channel:
- 220 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8655ARZ FAQ
1.How can I place an order for AD8655ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8655ARZ 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 AD8655ARZ reliable?
The price and inventory of AD8655ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8655ARZ is usually 5 days.
3.What payment methods are accepted for AD8655ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8655ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8655ARZ?
AD8655ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8655ARZ 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 AD8655ARZ?
For technical support, including AD8655ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8655ARZ requirements.
6.How does Aetrix verify that AD8655ARZ is sourced from the original manufacturer or authorized distributors?
All AD8655ARZ 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 AD8655ARZ meets industry standards.
7.What is the process for return or replacement of AD8655ARZ?
All AD8655ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8655ARZ, 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 AD8655ARZ part is unused and in its original packaging.
Return procedure for AD8655ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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