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Analog Devices Inc. AD8668ARZ-REEL7
- Part No.:
- AD8668ARZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8668ARZ-REEL7.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
AD8668ARZ-REEL7 from Analog Devices is a quad, rail-to-rail output, precision operational amplifier optimized for single-supply operation from 5 V to 16 V. It delivers 4 MHz gain-bandwidth product, 2.5 mV max offset voltage, 1 pA max input bias current, and 8 nV/√Hz voltage noise at 10 kHz - enabling high-fidelity signal conditioning in photodiode amplification and medical physiological measurement circuits.
For engineers reviewing the AD8668ARZ-REEL7 datasheet, AD8668ARZ-REEL7 pinout, AD8668ARZ-REEL7 application, or AD8668ARZ-REEL7 equivalent, key selection criteria include its extended industrial temperature range (−40°C to +125°C), rail-to-rail output swing with <50 mV low-side saturation at 1 mA, and guaranteed unity-gain stability across supply voltages up to 16 V.
Technical Context
The AD8668ARZ-REEL7 implements a CMOS input stage delivering ultra-low input bias current (≤1 pA) and low input voltage noise (8 nV/√Hz @ 10 kHz), paired with a robust output stage capable of sourcing/sinking ±140 mA under 16 V supply. Its 4 MHz GBP and 3.5 V/μs slew rate support stable closed-loop operation in unity-gain and higher-gain configurations without external compensation.
Designed for wide common-mode input range (−0.1 V to +14.0 V at 16 V supply) and high PSRR (98 dB typical), the device maintains precision performance across varying supply conditions and load currents - critical for reference buffers driving high-resolution ADCs and level-shifting circuits interfacing mixed-voltage domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 4 MHz - supports stable amplification of signals up to ~2.5 MHz in closed-loop G = 1 configuration. |
| Input Bias Current | 1 pA max - enables accurate amplification of high-impedance sources like photodiodes without significant DC error. |
| Offset Voltage | 2.5 mV max - ensures ≤0.5% full-scale error when amplifying 500 mV signals in sensor front-ends. |
| Rail-to-Rail Output | VOL = 40 mV max, VOH = 15.96 V min at 16 V supply - delivers >99% supply utilization for dynamic range maximization. |
| Supply Range | 5 V to 16 V single supply or ±2.5 V to ±8 V dual supply - matches industrial and automotive ADC/DAC rails. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial embedded control environments. |
| Voltage Noise Density | 8 nV/√Hz @ 10 kHz - minimizes broadband noise contribution in audio and instrumentation signal chains. |
Pinout & Package
AD8668ARZ-REEL7 is packaged in a 14-lead SOIC_N (R-14) with standard 1.27 mm pitch, 8.75 mm × 4.00 mm body, and JEDEC MS-012-AB compliance. Thermal resistance θJA is 120°C/W, supporting continuous operation at full rating in moderate airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to ±140 mA with rail-to-rail swing. |
| 2 | –IN A | Inverting input of Amplifier A - high-impedance CMOS node (<1 pA bias). |
| 3 | +IN A | Non-inverting input of Amplifier A - accepts common-mode voltage up to V+ − 0.1 V. |
| 4 | V– | Negative supply rail - connects to GND in single-supply mode or negative rail in dual-supply mode. |
| 5 | OUT D | Amplifier D output - independently buffered, identical specs to OUT A. |
| 6 | –IN D | Inverting input of Amplifier D - electrically isolated from other inputs; no crosstalk (−115 dB channel separation). |
| 7 | +IN D | Non-inverting input of Amplifier D - supports same input voltage range as +IN A. |
| 8 | V+ | Positive supply rail - operates from 5 V to 16 V; PSRR = 98 dB suppresses supply ripple. |
| 9 | +IN B | Non-inverting input of Amplifier B - fully independent input stage with matched DC specs. |
| 10 | +IN C | Non-inverting input of Amplifier C - enables simultaneous multi-channel sensing without shared reference errors. |
| 11 | –IN B | Inverting input of Amplifier B - low bias current preserves accuracy in high-Z feedback networks. |
| 12 | OUT B | Amplifier B output - rail-to-rail swing, 4 MHz bandwidth, unity-gain stable. |
| 13 | –IN C | Inverting input of Amplifier C - supports precision differential configurations with matched offsets. |
| 14 | OUT C | Amplifier C output - identical AC/DC performance to other channels; no phase reversal on overdrive. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Drives within 40 mV of GND and within 40 mV of V+ at 16 V supply - maximizes dynamic range for 12–16-bit ADC interfaces. |
| Ultra-low input bias current | ≤1 pA at 25°C - eliminates significant offset error in >1 MΩ sensor interface networks (e.g., pH electrodes, piezoresistive sensors). |
| Wide supply range | Operates from 5 V to 16 V single supply - eliminates need for dedicated low-voltage LDOs in industrial PLC I/O modules. |
| No output phase reversal | Guaranteed behavior under input overdrive - prevents latch-up or uncontrolled system response in safety-critical monitoring circuits. |
| Automotive-qualified variant available | AD8668WARZ-REEL7 meets AEC-Q100 Grade 1 requirements - supports direct use in engine control and battery management systems. |
Applications
| Photodiode Amplification | Medical Physiological Monitoring |
|---|---|
Use Scenario: Amplifying weak current from reverse-biased silicon photodiodes in pulse oximetry or spectrophotometry. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1 pA input bias minimizing dark-current-induced offset drift. Use Value: Enables sub-picoampere current resolution with 8 nV/√Hz noise floor, directly supporting <1% SpO₂ accuracy. |
Use Scenario: Conditioning ECG, EEG, or EMG electrode signals in portable patient monitors. IC Role / Device Role / Timing Role: Front-end instrumentation amplifier driver with rail-to-rail output driving 16-bit SAR ADC reference buffers. Use Value: Delivers 120 dB CMRR and <2.5 mV offset across −40°C to +125°C, ensuring diagnostic-grade baseline stability. |
| High-Voltage Reference Buffering | Industrial Level-Shifting Interface |
Use Scenario: Buffering precision 10 V references for 16-bit DACs in programmable logic controller (PLC) analog outputs. IC Role / Device Role / Timing Role: Unity-gain stable voltage follower with 145 V/mV open-loop gain and 98 dB PSRR. Use Value: Maintains <0.01% reference accuracy despite 16 V supply ripple, eliminating need for post-regulation filtering. |
Use Scenario: Shifting 3.3 V logic-sensor outputs to 12 V actuator control lines in factory automation I/O modules. IC Role / Device Role / Timing Role: Single-supply level translator with rail-to-rail input/output and 4 MHz bandwidth for PWM edge fidelity. Use Value: Supports clean 100 kHz PWM translation with <10 ns propagation delay variation, preventing motor jitter. |
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), lower noise (5.6 nV/√Hz), but narrower supply (4.5–36 V dual only; not single-supply optimized) | Better for ultra-low-offset lab equipment; unsuitable for 5 V single-supply sensor nodes | Select OPA2188AIDR only when dual-supply ≥±2.25 V is available and sub-100 μV offset is mandatory |
| ADA4625-1ARZ | Higher bandwidth (80 MHz), lower noise (2.9 nV/√Hz), but higher supply current (3.2 mA vs. 1.55 mA) and no automotive qualification | Preferred for high-speed active filters; less suitable for battery-powered portable medical devices | Choose ADA4625-1ARZ when >10 MHz signal bandwidth is required and power budget allows 2× current draw |
Compared with OPA2188AIDR and ADA4625-1ARZ, AD8668ARZ-REEL7 uniquely balances rail-to-rail operation on 5 V, 1 pA input bias, −40°C to +125°C operation, and SOIC packaging - making it the optimal choice for cost-sensitive, high-impedance, single-supply industrial and automotive signal chains where precision and robustness coexist.
Availability
AD8668ARZ-REEL7 is available at Aetrix Electronics and suitable for photodiode amplification, medical physiological monitoring, and industrial level-shifting applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8668ARZ-REEL7 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 semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD866x family was developed to deliver JFET-amplifier-level precision (low IB, low noise, wide VS) in CMOS processes - targeting cost-sensitive industrial, automotive, and medical sensor signal chains where reliability across −40°C to +125°C is non-negotiable.
FAQ
What is the maximum supply voltage for AD8668ARZ-REEL7?
The absolute maximum supply voltage for AD8668ARZ-REEL7 is 18 V, but the recommended operating range is 5 V to 16 V for both single- and dual-supply configurations. Operation at 16 V enables full rail-to-rail output swing (VOL ≤ 40 mV, VOH ≥ 15.94 V at 1 mA), while maintaining specified offset, noise, and bandwidth performance per the Rev. B datasheet.
Does AD8668ARZ-REEL7 support true rail-to-rail input?
No, AD8668ARZ-REEL7 features rail-to-rail *output* only. Its input common-mode voltage range extends from −0.1 V to V+ − 1.0 V (e.g., −0.1 V to +14.0 V at 16 V supply), meaning it does not accept signals at the positive rail. For true rail-to-rail input capability, consider the AD8605/AD8606/AD8608 family instead.
Is AD8668ARZ-REEL7 pin-compatible with other AD866x variants?
AD8668ARZ-REEL7 (14-lead SOIC_N) is not pin-compatible with AD8665 (5- or 8-lead) or AD8666 (8-lead); each member has distinct pin counts and layouts. However, all AD8668 variants - including AD8668ARZ-REEL7, AD8668ARUZ-REEL, and AD8668WARUZ-R7 - share identical 14-pin TSSOP/SOIC pinouts and electrical specifications, enabling direct substitution within the same package type.
What is the thermal resistance (θJA) of AD8668ARZ-REEL7?
The AD8668ARZ-REEL7 in 14-lead SOIC_N (R-14) package has a junction-to-ambient thermal resistance (θJA) of 120°C/W, as specified in Table 4 of the Rev. B datasheet. This value assumes standard JEDEC 2S2P test board conditions; actual PCB layout, copper area, and airflow will affect real-world thermal performance.
Can AD8668ARZ-REEL7 drive capacitive loads without oscillation?
AD8668ARZ-REEL7 is unity-gain stable but exhibits increasing overshoot with capacitive loads: Figure 21 shows ≤10% overshoot at 100 pF and ≤70% at 1000 pF (16 V supply). For loads >100 pF, a small series resistor (10–50 Ω) at the output is recommended to maintain stability, especially in photodiode transimpedance configurations where stray capacitance is unavoidable.
AD8668ARZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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-SOIC
AD8668ARZ-REEL7 FAQ
1.How can I place an order for AD8668ARZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8668ARZ-REEL7 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 AD8668ARZ-REEL7 reliable?
The price and inventory of AD8668ARZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8668ARZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD8668ARZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8668ARZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8668ARZ-REEL7?
AD8668ARZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8668ARZ-REEL7 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 AD8668ARZ-REEL7?
For technical support, including AD8668ARZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8668ARZ-REEL7 requirements.
6.How does Aetrix verify that AD8668ARZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD8668ARZ-REEL7 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 AD8668ARZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD8668ARZ-REEL7?
All AD8668ARZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8668ARZ-REEL7, 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 AD8668ARZ-REEL7 part is unused and in its original packaging.
Return procedure for AD8668ARZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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