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Analog Devices Inc. AD8668ARZ
- Part No.:
- AD8668ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8668ARZ.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:550
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Product details
Overview
AD8668ARZ 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, 3.5 V/μs slew rate, 2.5 mV max input offset voltage, and 1 pA max input bias current-enabling high-accuracy signal conditioning in photodiode amplification and medical physiological measurement circuits.
For engineers reviewing the AD8668ARZ datasheet, AD8668ARZ pinout, AD8668ARZ application, or AD8668ARZ equivalent, this page provides verified specifications, SOIC_N-14 package details, automotive-qualified alternatives, and design-critical performance context for sensor interface, reference buffering, and ADC driver use cases.
Technical Context
The AD8668ARZ implements a CMOS input stage with rail-to-rail output swing, supporting wide common-mode input range (−0.1 V to +14.0 V at 16 V supply) and high open-loop gain (130–255 V/mV). Its unity-gain stability and 70°–73° phase margin ensure robust performance in closed-loop configurations up to 4 MHz.
It operates across −40°C to +125°C with supply current per amplifier of 1.15–1.55 mA (typ), low 8 nV/√Hz voltage noise at 10 kHz, and channel separation of −115 dB at 10 kHz-making it suitable for multi-channel, low-noise, high-impedance analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 4 MHz - supports stable unity-gain and higher-gain signal conditioning up to audio and medium-speed data acquisition frequencies. |
| Input Offset Voltage | 2.5 mV max - enables accurate DC-coupled amplification in precision sensor interfaces without significant zero-error drift compensation. |
| Input Bias Current | 1 pA max - preserves signal integrity in ultra-high-impedance nodes (e.g., photodiode, pH electrode, piezoelectric sensors). |
| Rail-to-Rail Output | Swings within 22–40 mV of ground and within 0.04–0.1 V of VDD - maximizes dynamic range in single-supply systems with limited headroom. |
| 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 and simplifies power architecture. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial control, and medical equipment environments. |
| Voltage Noise Density | 8 nV/√Hz @ 10 kHz - ensures minimal contribution to system noise floor in band-limited sensor signal chains. |
Pinout & Package
AD8668ARZ 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load or next-stage input with rail-to-rail swing and 140 mA short-circuit capability. |
| 2 | –IN A | Inverting input of Amplifier A - accepts feedback network or differential signal path with 1 pA max bias current. |
| 3 | +IN A | Non-inverting input of Amplifier A - connects to high-impedance sensor or reference with −0.1 V to +14.0 V common-mode range. |
| 4 | V– | Negative supply rail - tied to GND in single-supply mode; supports dual-supply operation down to −8 V. |
| 5 | +IN B | Non-inverting input of Amplifier B - electrically isolated from other inputs; enables independent channel configuration. |
| 6 | –IN B | Inverting input of Amplifier B - shares no internal coupling with other channels; maintains −115 dB channel separation at 10 kHz. |
| 7 | OUT B | Amplifier B output - identical AC/DC performance to OUT A; supports parallel or differential output topologies. |
| 8 | V+ | Positive supply rail - accepts 5–16 V; PSRR of 98–115 dB suppresses supply ripple in noisy environments. |
| 9 | OUT C | Amplifier C output - fully independent channel; allows 4-channel simultaneous signal processing without crosstalk degradation. |
| 10 | –IN C | Inverting input of Amplifier C - matched input characteristics to other channels; supports consistent gain-setting resistor networks. |
| 11 | +IN C | Non-inverting input of Amplifier C - same input voltage range and bias current as pins 2/3/6/10/13/14. |
| 12 | V– | Shared negative supply - all four amplifiers reference same V–; requires low-impedance grounding for optimal CMRR. |
| 13 | +IN D | Non-inverting input of Amplifier D - completes quad-channel set; enables compact multi-sensor or multi-reference designs. |
| 14 | –IN D | Inverting input of Amplifier D - pin-compatible with industry-standard quad op-amp layouts using SOIC-14 footprint. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full dynamic range in 5 V systems: VOL = 22–40 mV, VOH = 4.88–4.93 V (5 V supply); extends usable output to >98% of supply rails. |
| Low input bias current (1 pA max) | Minimizes voltage error across high-value feedback resistors (>1 MΩ), critical for photodiode transimpedance and electrochemical sensor amplifiers. |
| Wide supply range (5–16 V) | Eliminates need for level-shifting or charge-pump supplies when interfacing with 12 V industrial sensors or 16 V DACs/ADCs. |
| Automotive qualification (AD8668W variant) | Meets AEC-Q100 stress testing requirements; AD8668ARZ shares identical electrical specs and SOIC_N-14 packaging with automotive-grade version. |
| −115 dB channel separation | Prevents inter-channel crosstalk in multi-channel data acquisition, enabling simultaneous sampling without guard-band timing or layout isolation. |
Applications
| Photodiode Amplification | Medical Physiological Measurement |
|---|---|
Use Scenario: Converting weak current from silicon photodiodes in pulse oximeters or spectrophotometers 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 signal loss across >10 MΩ feedback resistors; 8 nV/√Hz noise ensures <1 μV RMS integrated noise in 10 kHz bandwidth. |
Use Scenario: Amplifying microvolt-level ECG, EEG, or EMG signals in portable patient monitors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with rail-to-rail output and high CMRR (90–110 dB) to reject 50/60 Hz interference. Use Value: −40°C to +125°C rating supports battery-powered field devices; 2.5 mV max VOS reduces calibration burden in DC-coupled biopotential paths. |
| Reference Buffering | ADC Driver |
Use Scenario: Isolating precision voltage references (e.g., REF5025) from load variations in multi-channel data converters. IC Role / Device Role / Timing Role: Low-output-impedance buffer (50 Ω closed-loop ZOUT at 1 MHz) driving capacitive DAC reference inputs. Use Value: 4 MHz GBW and 3.5 V/μs SR settle 16-bit codes within 100 ns; rail-to-rail swing ensures full-scale reference utilization. |
Use Scenario: Driving SAR or sigma-delta ADC inputs with fast settling and minimal distortion in industrial PLC modules. IC Role / Device Role / Timing Role: Single-supply driver with 140 mA short-circuit current to charge 10–100 pF input capacitance without overshoot. Use Value: 70°–73° phase margin and −115 dB channel separation prevent sampling errors in simultaneous multi-channel ADC systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8668WARZ | Automotive-qualified variant; identical electrical specs, same SOIC_N-14 package, extended reliability testing (AEC-Q100 Grade 1). | Required for automotive ECUs, ADAS sensors, and infotainment power management where qualification documentation is mandatory. | Select AD8668WARZ when automotive PPAP, failure-in-time (FIT) data, or temperature cycling reports are contractually required. |
| OP4177ARZ | Lower offset (60 μV typ), lower noise (7.9 nV/√Hz), but narrower supply range (±2.5 V to ±15 V), slower slew rate (0.7 V/μs), and no rail-to-rail output. | Better for ultra-precision DC applications (e.g., weigh scales, strain gauge bridges) where speed and rail-swing are secondary. | Choose OP4177ARZ only if sub-100 μV offset dominates over bandwidth and output swing requirements. |
Compared with AD8668ARZ, AD8668WARZ offers identical performance with added automotive traceability, while OP4177ARZ trades speed and rail-to-rail capability for superior DC precision-making AD8668ARZ optimal for cost-sensitive, wide-supply, high-speed sensor interfaces.
Availability
AD8668ARZ is available at Aetrix Electronics and suitable for photodiode amplification, medical physiological measurement, and reference buffering requiring stable component supply across industrial and automotive production cycles.
Supply support for AD8668ARZ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD866x product line was designed specifically for precision, low-noise, rail-to-rail operational amplification in cost-sensitive industrial, medical, and automotive sensor signal chains-emphasizing wide supply range and ultra-low input bias current.
FAQ
What is the operating temperature range for AD8668ARZ?
The AD8668ARZ is specified for continuous operation from −40°C to +125°C, meeting extended industrial requirements. This range is validated across all key parameters including input offset voltage, bias current, and gain bandwidth, making AD8668ARZ suitable for under-hood automotive modules and industrial control cabinets without derating.
Does AD8668ARZ support true rail-to-rail input?
No, AD8668ARZ features rail-to-rail *output* only. Its input common-mode voltage range is −0.1 V to +14.0 V at 16 V supply (or −0.1 V to +3.0 V at 5 V supply), meaning it does not accept signals at the negative rail (V–) or beyond V+ by more than 0.1 V. Input stage is CMOS-based with high impedance but not rail-to-rail input.
What package type is used for AD8668ARZ?
AD8668ARZ uses the 14-lead SOIC_N (narrow-body) package, designated R-14 per Analog Devices' ordering guide. It measures 8.75 mm × 4.00 mm with 1.27 mm lead pitch and complies with JEDEC MS-012-AB standards. Thermal resistance is θJA = 120°C/W.
Is AD8668ARZ pin-compatible with other quad op-amps in SOIC-14?
AD8668ARZ follows the industry-standard quad op-amp pinout for SOIC-14: pins 1/7/8/14 are outputs, pins 2/3/5/6/10/11/13/14 are inputs, and pins 4/12 are supplies. It is functionally and physically compatible with generic SOIC-14 quad op-amp footprints, though electrical behavior (e.g., rail-to-rail output, 1 pA IB) differs from legacy bipolar parts.
Can AD8668ARZ drive capacitive loads directly?
AD8668ARZ is unity-gain stable and tested with 10 pF loads, but large capacitive loads (>100 pF) may cause peaking or instability. For >100 pF, isolate with a series resistor (e.g., 10–100 Ω) between output and capacitance. The datasheet confirms stable operation with CL = 10 pF and RL = 10 kΩ, yielding <10% overshoot and 70° phase margin.
AD8668ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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:
- 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 FAQ
1.How can I place an order for AD8668ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8668ARZ 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 reliable?
The price and inventory of AD8668ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8668ARZ is usually 5 days.
3.What payment methods are accepted for AD8668ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8668ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8668ARZ?
AD8668ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8668ARZ 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?
For technical support, including AD8668ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8668ARZ requirements.
6.How does Aetrix verify that AD8668ARZ is sourced from the original manufacturer or authorized distributors?
All AD8668ARZ 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 meets industry standards.
7.What is the process for return or replacement of AD8668ARZ?
All AD8668ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8668ARZ, 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 part is unused and in its original packaging.
Return procedure for AD8668ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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