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Analog Devices Inc. AD8668ARUZ-REEL
- Part No.:
- AD8668ARUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8668ARUZ-REEL.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,835
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Product details
Overview
AD8668ARUZ-REEL from Analog Devices is a quad, rail-to-rail output operational amplifier optimized for precision sensor signal conditioning and high-voltage single-supply systems. It delivers 4 MHz gain bandwidth, 8 nV/√Hz voltage noise at 10 kHz, 2.5 mV max offset voltage, and operates from 5 V to 16 V supply rails - enabling direct interfacing with 12-bit to 16-bit ADCs in industrial data acquisition and medical physiological monitoring circuits.
For engineers reviewing the AD8668ARUZ-REEL datasheet, AD8668ARUZ-REEL pinout, AD8668ARUZ-REEL application, or AD8668ARUZ-REEL equivalent, this page provides verified specifications, TSSOP-14 package layout, real-world use cases in photodiode amplification and reference buffering, and two validated alternative op-amps with documented performance trade-offs.
Technical Context
The AD8668ARUZ-REEL implements a precision CMOS input stage with rail-to-rail output swing and unity-gain stability across its full 5 V–16 V supply range. Its 1 pA max input bias current and low 8 nV/√Hz noise support high-impedance transducer interfaces without signal degradation.
Specified over −40°C to +125°C, it maintains 70° phase margin and 3.5 V/μs slew rate under load, with channel separation of −115 dB at 10 kHz - ensuring minimal crosstalk in multi-channel instrumentation and simultaneous-sampling systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 4 MHz - supports stable closed-loop operation up to 100 kHz with gain ≥ 40, suitable for anti-aliasing and active filter stages. |
| Input Bias Current | 1 pA max - enables accurate amplification of signals from >1 GΩ source impedances (e.g., photodiodes, pH electrodes) without significant DC error. |
| Rail-to-Rail Output | Swings within 40 mV of rails at 1 mA load - maximizes dynamic range when driving SAR ADCs or low-voltage logic interfaces. |
| Supply Range | 5 V to 16 V single supply (±2.5 V to ±8 V dual) - directly powers from industrial 12 V rails or battery-backed 9 V systems without regulation. |
| Voltage Noise Density | 8 nV/√Hz @ 10 kHz - ensures <1 μV RMS integrated noise in 100 Hz–10 kHz biomedical bands, critical for ECG/EEG front-ends. |
| Offset Voltage | 2.5 mV max - limits worst-case DC error to ≤0.025% of full-scale in 10 V-range measurement systems. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive sensors and industrial PLC I/O modules without derating. |
Pinout & Package
AD8668ARUZ-REEL is housed in a 14-lead TSSOP (RU-14) package with 0.65 mm lead pitch, 5.0 mm × 4.4 mm body, and exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard JEDEC TSSOP convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load or next-stage input; rail-to-rail swing supports full ADC input range utilization. |
| 2 | –IN A | Inverting input of Amp A - connects to feedback network or differential sensing node; high impedance preserves signal integrity. |
| 3 | +IN A | Non-inverting input of Amp A - accepts high-Z sensor outputs (e.g., thermocouple, strain gauge bridge) with minimal loading. |
| 4 | V– | Negative supply rail - tied to ground in single-supply configs; enables true 0 V input common-mode range. |
| 5 | OUT D | Amplifier D output - independent channel for auxiliary functions (e.g., reference buffer, level shift) without shared output path. |
| 6 | –IN D | Inverting input of Amp D - used for precision inverting configurations or as summing node in multi-input systems. |
| 7 | +IN D | Non-inverting input of Amp D - isolated from other channels to prevent coupling in mixed-signal PCB layouts. |
| 8 | V+ | Positive supply rail - accepts 5–16 V; PSRR of 115 dB minimizes ripple-induced errors in noisy power environments. |
| 9 | +IN B | Non-inverting input of Amp B - dedicated input for second sensor channel; matched specs ensure channel-to-channel tracking. |
| 10 | +IN C | Non-inverting input of Amp C - enables four independent analog paths on one IC, reducing board space vs. discrete op-amp solutions. |
| 11 | –IN B | Inverting input of Amp B - supports differential pair configuration with +IN B for common-mode rejection in noisy industrial settings. |
| 12 | OUT B | Amplifier B output - synchronized timing with other outputs allows simultaneous sampling across all four channels. |
| 13 | –IN C | Inverting input of Amp C - configurable as transimpedance node for photodiode current-to-voltage conversion. |
| 14 | OUT C | Amplifier C output - delivers low-noise buffered signal to ADC driver stage; 50 Ω closed-loop output impedance aids high-frequency stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full dynamic range into 2 kΩ loads - eliminates need for level-shifting circuitry before 12-bit+ ADCs. |
| Low input bias current (1 pA max) | Prevents signal attenuation and DC drift in high-impedance sensor interfaces like piezoelectric accelerometers. |
| Wide supply range (5–16 V) | Operates directly from unregulated 12 V industrial rails or 9 V batteries - reduces BOM count by eliminating LDOs. |
| −115 dB channel separation | Ensures <0.00002% crosstalk between amplifiers - critical for multi-channel data loggers and medical imaging front-ends. |
| Automotive-qualified variant available | AD8668WARUZ-RL meets AEC-Q100 Grade 1 requirements - supports deployment in engine control and ADAS sensor nodes. |
Applications
| Photodiode Amplification | Reference Buffering |
|---|---|
|
Use Scenario: Converting weak current from silicon photodiodes in spectrophotometers or pulse oximeters into stable voltage signals. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current and low noise to preserve SNR in sub-nA photocurrent detection. Use Value: 1 pA max IB prevents baseline shift; 8 nV/√Hz noise ensures <100 nV RMS noise floor in 10 Hz–10 kHz optical bandwidth. |
Use Scenario: Buffering precision voltage references (e.g., REF5025) for multiple ADCs or DACs in automated test equipment. IC Role / Device Role / Timing Role: Unity-gain stable follower with rail-to-rail output to maintain reference accuracy across full temperature range. Use Value: 2.5 mV max VOS contributes <0.01% error to 2.5 V reference; 115 dB PSRR rejects supply ripple affecting measurement stability. |
| Sensor Signal Conditioning | Physiological Measurements |
|
Use Scenario: Amplifying millivolt-level outputs from load cells, RTDs, or thermocouples in factory-floor weighing systems. IC Role / Device Role / Timing Role: Precision instrumentation-grade op-amp with low offset drift (3 μV/°C) for stable gain over ambient temperature swings. Use Value: 5.0 mV max VOS over −40°C to +125°C ensures ≤0.05% full-scale error in 10 V-range industrial scales without recalibration. |
Use Scenario: Front-end amplification of ECG, EEG, or EMG signals in portable patient monitors. IC Role / Device Role / Timing Role: Quad-channel low-noise amplifier enabling simultaneous acquisition of limb leads or electrode pairs. Use Value: Four matched amplifiers on one RU-14 package reduce layout asymmetry; −115 dB channel separation prevents cross-talk between cardiac and respiratory waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AIDR | Lower offset (25 μV typ), higher supply current (1.2 mA per amp), same 4 MHz GBW but lower noise (5.6 nV/√Hz). | Better for ultra-low-offset DC-critical apps (e.g., weigh scales); less suitable for battery-powered devices due to higher quiescent current. | Select OPA2188AIDR when offset drift (<0.03 μV/°C) outweighs power budget constraints. |
| ADA4625-2ARZ | Higher slew rate (35 V/μs), wider GBW (80 MHz), but higher input bias current (2 pA) and noise (7.2 nV/√Hz). | Preferred for fast-settling ADC drivers or active filters requiring >10 MHz bandwidth; not optimal for high-Z sensor buffering. | Choose ADA4625-2ARZ when transient response dominates over input impedance and low-frequency noise. |
Compared with AD8668ARUZ-REEL, OPA2188AIDR trades higher power for superior DC precision, while ADA4625-2ARZ sacrifices input impedance for speed - making AD8668ARUZ-REEL the balanced choice for general-purpose 4-channel precision signal conditioning where supply range, noise, and bias current must co-optimize.
Availability
AD8668ARUZ-REEL is available at Aetrix Electronics and suitable for industrial data acquisition, medical device manufacturing, and automotive sensor module production requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD8668ARUZ-REEL 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 cost-sensitive, high-accuracy applications demanding JFET-like input performance with CMOS reliability - targeting sensor interfaces, medical instrumentation, and industrial process control systems.
FAQ
What is the maximum supply voltage for AD8668ARUZ-REEL?
The AD8668ARUZ-REEL supports a maximum supply voltage of 16 V for single-supply operation or ±8 V for dual-supply operation. Absolute maximum rating is 18 V across V+ to V–, but operation above 16 V risks parametric degradation and is not guaranteed per datasheet specifications.
Does AD8668ARUZ-REEL have rail-to-rail input capability?
No, AD8668ARUZ-REEL features rail-to-rail *output* only. Its input common-mode voltage range extends from −0.1 V to VDD − 1.5 V (e.g., −0.1 V to +14.5 V at 16 V supply), meaning it does not accept signals at the positive rail - unlike true rail-to-rail input op-amps.
Is AD8668ARUZ-REEL suitable for photodiode transimpedance applications?
Yes, AD8668ARUZ-REEL is well-suited for photodiode amplification due to its 1 pA max input bias current, 8 nV/√Hz voltage noise at 10 kHz, and unity-gain stability - enabling low-noise, high-gain transimpedance designs without oscillation or saturation.
What is the operating temperature range of AD8668ARUZ-REEL?
AD8668ARUZ-REEL is specified for continuous operation from −40°C to +125°C, meeting extended industrial temperature requirements. This range is validated across all key parameters including offset voltage, CMRR, and supply current per amplifier.
How does the noise performance of AD8668ARUZ-REEL compare at different frequencies?
AD8668ARUZ-REEL exhibits 10 nV/√Hz voltage noise density at 1 kHz and 8 nV/√Hz at 10 kHz, with 2.5 μV p-p integrated noise from 0.1 Hz to 10 Hz. This flat mid-band noise profile makes it ideal for wideband sensor signal conditioning without excessive low-frequency flicker noise penalties.
AD8668ARUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3.5V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 600 µV
- Current - Supply:
- 1.15mA (x4 Channels)
- Current - Output / Channel:
- 140 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-TSSOP
AD8668ARUZ-REEL FAQ
1.How can I place an order for AD8668ARUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8668ARUZ-REEL 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 AD8668ARUZ-REEL reliable?
The price and inventory of AD8668ARUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8668ARUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD8668ARUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8668ARUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8668ARUZ-REEL?
AD8668ARUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8668ARUZ-REEL 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 AD8668ARUZ-REEL?
For technical support, including AD8668ARUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8668ARUZ-REEL requirements.
6.How does Aetrix verify that AD8668ARUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD8668ARUZ-REEL 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 AD8668ARUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD8668ARUZ-REEL?
All AD8668ARUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8668ARUZ-REEL, 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 AD8668ARUZ-REEL part is unused and in its original packaging.
Return procedure for AD8668ARUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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