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Analog Devices Inc. AD8682ARZ
- Part No.:
- AD8682ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8682ARZ.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:365
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Product details
Overview
AD8682ARZ from Analog Devices is a dual-channel, precision JFET-input operational amplifier optimized for low-power, high-speed signal conditioning in battery-powered and portable instrumentation systems. It delivers 9 V/μs slew rate, 3.5 MHz gain bandwidth, 1 mV max offset voltage at 25°C, 250 μA/amp supply current, and operates from ±4.5 V to ±18 V supplies. It is used in high-side current sensing, loop filters, and portable medical instrumentation.
For engineers reviewing the AD8682ARZ datasheet, AD8682ARZ pinout, AD8682ARZ application, or AD8682ARZ equivalent, key selection criteria include input bias current ≤20 pA at 25°C, rail-to-rail output swing capability (±13.5 V into 10 kΩ), unity-gain stability, and SOIC_N-8 package compatibility with space-constrained PCB layouts.
Technical Context
The AD8682ARZ employs a JFET input stage enabling ultra-low input bias current (≤20 pA at 25°C) and high input impedance (>1012 Ω), critical for high-source-impedance sensor interfaces. Its unity-gain stable architecture supports direct use in noninverting configurations without external compensation.
It features a 3.5 MHz gain-bandwidth product and 7–9 V/μs slew rate under ±15 V supplies, enabling accurate amplification of fast transients in active filters and integrators while maintaining dc precision - including 10 μV/°C offset drift and 90 dB CMRR at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amplifier | 250 μA max - enables multi-channel operation in battery-powered devices with >10-year runtime on coin cells. |
| Slew Rate | 9 V/μs typical - supports clean amplification of 100 kHz full-scale signals without distortion in active filter stages. |
| Gain Bandwidth Product | 3.5 MHz - allows stable closed-loop gain ≥10 at 350 kHz, suitable for anti-aliasing and reconstruction filters. |
| Input Offset Voltage | 1 mV max at 25°C - ensures ≤10 mV error in 10× gain strain gauge amplifiers without trimming. |
| Input Bias Current | 20 pA max at 25°C - prevents >2 mV error across 100 MΩ source impedances (e.g., piezoelectric sensors). |
| Common-Mode Rejection Ratio | 90 dB typical - rejects >30 mV of power-supply ripple in single-supply instrumentation front-ends. |
| Operating Temperature Range | −40°C to +85°C - qualified for industrial and portable medical equipment deployed in uncontrolled environments. |
Pinout & Package
AD8682ARZ is housed in an 8-lead SOIC_N (R-8) package measuring 4.90 mm × 3.90 mm × 1.75 mm, RoHS-compliant, with standard JEDEC MS-012-AA footprint and 1.27 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to ±13.5 V into 10 kΩ; requires no isolation for unity-gain buffer use. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node; sensitive to layout-induced leakage above 100 pA. |
| 3 | +IN A | Noninverting input of Amp A - accepts common-mode voltages from −11 V to +15 V, enabling high-side sensing. |
| 4 | V– | Negative supply rail - must be decoupled within 5 mm of pin using ≥100 nF ceramic capacitor. |
| 5 | +IN B | Noninverting input of Amp B - electrically isolated from Amp A inputs; shares same CM range as Pin 3. |
| 6 | –IN B | Inverting input of Amp B - independent bias current path; not internally tied to Amp A. |
| 7 | OUT B | Amplifier B output - fully independent channel; supports simultaneous dual-sensor conditioning. |
| 8 | V+ | Positive supply rail - accepts ±4.5 V to ±18 V; PSRR of 114 dB minimizes supply noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| JFET input stage | Ensures ≤20 pA input bias current at 25°C, preserving accuracy in high-impedance pH, photodiode, or piezoelectric sensor interfaces. |
| Unity-gain stable | Eliminates need for external compensation components in buffer, integrator, or gain-of-1 filter configurations. |
| Rail-to-rail output swing | Delivers ±13.5 V into 10 kΩ load on ±15 V supplies, maximizing dynamic range in analog front-ends. |
| Low 1/f noise | 1.3 μV p-p (0.1 Hz to 10 Hz) enables stable DC-coupled amplification in precision weighing and strain measurement. |
| High PSRR (114 dB) | Rejects >100,000:1 of supply ripple, critical for clean signal acquisition in shared-rail mixed-signal systems. |
Applications
| High-Side Current Sensing | Active Precision Filter |
|---|---|
|
Use Scenario: Monitoring battery discharge current in portable defibrillators by amplifying mV-level voltage drop across a 0.1 Ω shunt placed between load and positive rail. IC Role / Device Role / Timing Role: Dual op-amp configured as high-side current sense amplifier with reference comparator; Channel A conditions signal, Channel B compares to threshold. Use Value: Enables accurate <1% current measurement over −40°C to +85°C using only one AD8682ARZ, eliminating need for dedicated current-sense ICs or level-shifting circuitry. |
Use Scenario: Implementing a 2nd-order Butterworth low-pass filter (fc = 10 kHz) in ultrasound front-end preprocessing to suppress RF interference before ADC sampling. IC Role / Device Role / Timing Role: Dual op-amp used in dual-amplifier state-variable topology; one channel provides integrator function, the other supplies feedback summation. Use Value: Achieves <0.1 dB passband flatness and −40 dB stopband attenuation at 50 kHz using only passive R/C and AD8682ARZ - no external trim required due to 3.5 MHz GBW and 9 V/μs slew rate. |
| Strain Gauge Signal Conditioning | Portable Medical Instrumentation |
|
Use Scenario: Amplifying differential output from a Wheatstone bridge in handheld blood pressure monitors, where bridge excitation is 5 V and output spans ±10 mV. IC Role / Device Role / Timing Role: Dual op-amp wired as precision instrumentation amplifier (gain = 500) using matched external resistors; both channels operate in parallel for common-mode rejection. Use Value: Delivers <5 μV offset error after gain, meeting ISO 81001-2 clinical accuracy requirements without auto-zero or chopper stabilization. |
Use Scenario: Signal conditioning for ECG electrode inputs in wearable Holter monitors, requiring ultra-low power, low noise, and immunity to electrode half-cell potential shifts. IC Role / Device Role / Timing Role: Dual op-amp used as AC-coupled differential amplifier (high-pass at 0.05 Hz, low-pass at 150 Hz); one channel handles lead I, the other lead II. Use Value: Enables 5-day continuous recording on a single CR2032 cell due to 500 μA total quiescent current, while maintaining <10 μV RMS input-referred noise in 0.05–150 Hz band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual JFET op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC2272CDR | Lower slew rate (3.6 V/μs), higher input bias current (1 pA typ but 60 pA max), wider offset spread (±2 mV). | Less suitable for >50 kHz active filters or high-Z sensor buffers requiring sub-20 pA bias. | Prefer AD8682ARZ when 9 V/μs slew rate and guaranteed ≤20 pA bias are mandatory for signal fidelity. |
| OPA2134PA | Higher supply current (4 mA/amp), larger offset drift (2 μV/°C), no specified −40°C to +85°C guarantee for IB ≤20 pA. | Not viable for battery life-critical portable designs; better suited for line-powered audio. | Choose AD8682ARZ for portable instrumentation where 250 μA/amp and −40°C to +85°C performance are required. |
Compared with TLC2272CDR and OPA2134PA, AD8682ARZ uniquely balances ultra-low input bias current, high slew rate, and micropower operation - making it the only dual JFET op-amp qualified for precision, wide-temperature, battery-operated medical and industrial sensing.
Availability
AD8682ARZ is available at Aetrix Electronics and suitable for portable medical instrumentation, high-side current monitoring, and active precision filter design requiring stable component supply across long production lifecycles.
Supply support for AD8682ARZ 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.
The AD868x family was developed specifically for low-power, high-precision signal conditioning in portable and battery-operated instrumentation - emphasizing JFET input integrity, rail-compatible operation, and temperature-stable dc performance.
FAQ
What is the maximum operating supply voltage for AD8682ARZ?
The AD8682ARZ supports a supply voltage range of ±4.5 V to ±18 V, with absolute maximum ratings of ±18 V on both V+ and V– pins. Operation beyond ±18 V risks permanent damage. The device maintains specified performance across this full range, including 250 μA/amp supply current and 9 V/μs slew rate at ±15 V, making AD8682ARZ suitable for industrial systems with wide input rails.
Does AD8682ARZ support high-side sensing applications?
Yes, AD8682ARZ supports high-side sensing with a guaranteed common-mode input voltage range of −11 V to +15 V under ±15 V supplies - covering the entire positive rail. This enables direct amplification of shunt voltage drops placed between load and V+, as confirmed in Figure 32 of the AD8682/AD8684 datasheet. No level-shifting circuitry is needed, and AD8682ARZ maintains 90 dB CMRR across this range.
Is AD8682ARZ unity-gain stable, and what does that mean for circuit design?
Yes, AD8682ARZ is explicitly unity-gain stable, as stated in both the General Description and Features sections of its datasheet. This means it can be configured as a voltage follower (gain = 1, noninverting) without external phase-compensation components. Engineers can directly connect output to inverting input without risk of oscillation - simplifying layout and reducing bill-of-materials for buffer, integrator, and active filter stages using AD8682ARZ.
What package type is used for AD8682ARZ, and is it compatible with standard SOIC footprints?
AD8682ARZ uses the 8-lead SOIC_N (narrow-body) package, designated R-8 in Analog Devices' ordering guide and compliant with JEDEC MS-012-AA. Its 1.27 mm lead pitch, 4.90 mm × 3.90 mm body, and gull-wing lead form match industry-standard SOIC-8 footprints - ensuring drop-in compatibility with existing PCB layouts designed for generic SOIC-8 op-amps, including thermal relief and solder mask clearance.
How does AD8682ARZ perform in low-noise, DC-coupled applications like strain gauge amplification?
AD8682ARZ delivers 1.3 μV p-p input-referred noise (0.1 Hz to 10 Hz) and 10 μV/°C offset drift, enabling stable DC-coupled amplification in strain gauge bridges. Its 1 mV max offset at 25°C and 3 mV max over −40°C to +25°C ensure minimal calibration burden. Combined with ≤20 pA input bias, AD8682ARZ avoids significant error from bridge resistor leakage - critical for achieving <0.1% linearity in handheld load cells and pressure sensors.
AD8682ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 9V/µs
- Gain Bandwidth Product:
- 3.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 6 pA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 210µA (x2 Channels)
- Current - Output / Channel:
- 12 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8682ARZ FAQ
1.How can I place an order for AD8682ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8682ARZ 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 AD8682ARZ reliable?
The price and inventory of AD8682ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8682ARZ is usually 5 days.
3.What payment methods are accepted for AD8682ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8682ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8682ARZ?
AD8682ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8682ARZ 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 AD8682ARZ?
For technical support, including AD8682ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8682ARZ requirements.
6.How does Aetrix verify that AD8682ARZ is sourced from the original manufacturer or authorized distributors?
All AD8682ARZ 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 AD8682ARZ meets industry standards.
7.What is the process for return or replacement of AD8682ARZ?
All AD8682ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8682ARZ, 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 AD8682ARZ part is unused and in its original packaging.
Return procedure for AD8682ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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