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Analog Devices Inc. AD8682ARMZ
- Part No.:
- AD8682ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8682ARMZ.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
AD8682ARMZ from Analog Devices is a dual-channel, low-power, precision JFET-input operational amplifier in an 8-lead MSOP package. It delivers 9 V/μs slew rate, 3.5 MHz gain bandwidth, and 1 mV max offset voltage at 25°C, with 250 μA/amp supply current. It is used in portable medical instrumentation and high-impedance sensor signal conditioning where rail-to-rail input capability (−11 V to +15 V common-mode range) and unity-gain stability are required.
For engineers reviewing the AD8682ARMZ datasheet, AD8682ARMZ pinout, AD8682ARMZ application, or AD8682ARMZ equivalent, key selection criteria include its 20 pA max input bias current at 25°C, ±4.5 V to ±18 V supply range, 90 dB typical CMRR, and suitability for active filters, loop filters, and strain gauge amplifiers in battery-powered systems.
Technical Context
The AD8682ARMZ employs a JFET input stage enabling ultra-low input bias current (≤20 pA @ 25°C) and wide common-mode input range (−11 V to +15 V), critical for high-source-impedance applications. Its unity-gain stable architecture supports noninverting G = 1 configurations with fast settling (1.6 μs to 0.01%) and minimal phase inversion risk when operated within specified common-mode limits.
It features a 3.5 MHz gain bandwidth product and 7–9 V/μs slew rate under ±15 V supplies, enabling accurate amplification of medium-frequency signals while maintaining <250 μA per amplifier quiescent current - a key trade-off optimized for portable instrumentation and precision analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current/Amplifier | 250 μA max - enables multi-channel operation in power-constrained portable devices without thermal derating. |
| Slew Rate | 9 V/μs typical - supports faithful reproduction of 100 kHz full-scale square waves with minimal distortion. |
| Gain Bandwidth Product | 3.5 MHz - allows stable closed-loop gain ≥10 at 350 kHz or unity gain up to 3.5 MHz. |
| Input Offset Voltage | 1 mV max @ 25°C - ensures ≤10 mV output error in 10× gain stages without trimming. |
| Input Bias Current | 20 pA max @ 25°C - minimizes voltage error across >100 MΩ source impedances (e.g., piezoelectric sensors). |
| Common-Mode Rejection | 90 dB typical - rejects >30 kV/V of power-supply or ground-noise coupling into differential inputs. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and portable medical environments without derating. |
Pinout & Package
AD8682ARMZ is housed in an 8-lead MSOP (RM-8) package with 0.65 mm lead pitch, 3.0 mm × 3.0 mm body, and exposed pad for thermal enhancement. Thermal resistance θJA = 210°C/W, θJC = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Output of Amplifier A - drives loads ≥10 kΩ with ±13.9 V swing (±15 V supply); stable at unity gain. |
| 2 | –IN A | Inverting input of Amplifier A - JFET input with ≤20 pA bias current; requires guarding for <1 pA leakage paths. |
| 3 | +IN A | Noninverting input of Amplifier A - same JFET characteristics as –IN A; supports common-mode range to ±15 V. |
| 4 | V– | Negative supply rail - must be decoupled locally with ≥0.1 μF ceramic capacitor to minimize PSRR degradation. |
| 5 | +IN B | Noninverting input of Amplifier B - electrically isolated from Channel A; shares same input stage specs. |
| 6 | –IN B | Inverting input of Amplifier B - matched to –IN A for dual-channel instrumentation applications (e.g., difference amplifiers). |
| 7 | OUT B | Output of Amplifier B - independent output stage; no crosstalk >80 dB at 1 kHz per datasheet. |
| 8 | V+ | Positive supply rail - accepts ±4.5 V to ±18 V; PSRR >92 dB ensures immunity to supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 20 pA max @ 25°C - preserves signal integrity in pH probes, photodiode transimpedance, and piezoelectric interfaces. |
| Rail-compatible input stage | −11 V to +15 V common-mode range on ±15 V supplies - enables direct sensing of high-side currents without level-shifting. |
| Unity-gain stable architecture | No external compensation required - simplifies layout for gain-of-1 buffers in filter feedback paths or sensor outputs. |
| Low 1/f noise | 1.3 μV p-p (0.1–10 Hz) - critical for DC-coupled precision measurement where drift dominates error budget. |
| High PSRR | 114 dB max - maintains accuracy in noisy mixed-signal PCBs with shared analog/digital supplies. |
Applications
| Portable Medical Instrumentation | Strain Gauge Amplifiers |
|---|---|
Use Scenario: Signal conditioning for ECG electrode front-ends in handheld monitors requiring low power and high CMRR. IC Role / Device Role / Timing Role: Dual-channel buffer and differential amplifier - one channel conditions reference electrode, the other amplifies active electrode with matched gain/offset. Use Value: 20 pA input bias prevents electrode polarization errors; 90 dB CMRR rejects 50/60 Hz mains interference without notch filtering. | Use Scenario: Wheatstone bridge output amplification in portable load cells or structural health monitoring sensors. IC Role / Device Role / Timing Role: Precision instrumentation amplifier core - configured as two-stage difference amplifier with gain set by external resistors. Use Value: 1 mV max offset ensures <0.1% full-scale error before calibration; 3.5 MHz bandwidth supports dynamic strain measurements up to 10 kHz. |
| Loop Filters | Active and Precision Filters |
Use Scenario: Second-order passive-RC + op-amp loop filter in PLL-based clock recovery circuits for telecom line cards. IC Role / Device Role / Timing Role: Integrator and summing node - converts charge pump current to control voltage with low drift and high linearity. Use Value: Low 10 μV/°C offset drift prevents frequency drift over temperature; 9 V/μs slew rate avoids phase lag in transient lock events. | Use Scenario: 4th-order Butterworth low-pass filter in audio ADC pre-conditioning for hearing aids. IC Role / Device Role / Timing Role: Dual op-amp section in biquad topology - implements complex pole pair with precise Q and cutoff tuning. Use Value: 3.5 MHz GBP enables 20 kHz filter design with <0.1 dB passband ripple; unity-gain stability eliminates need for gain-setting resistors. |
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 |
|---|---|---|---|
| TL072CDR | Higher supply current (1.4 mA/amp), lower slew rate (13 V/μs), 3 mV max VOS - wider tolerance, less precision. | General-purpose audio and industrial signal conditioning where ultra-low bias current is not required. | Choose TL072CDR only if cost sensitivity outweighs precision and power constraints. |
| OPA2134PA | Lower noise (8 nV/√Hz), higher GBP (8 MHz), 2.5 mA/amp supply - superior AC performance but 10× higher quiescent power. | High-fidelity audio and test equipment demanding wider bandwidth and lower distortion. | Choose OPA2134PA when bandwidth >5 MHz or voltage noise <10 nV/√Hz is mandatory; avoid in battery-powered designs. |
Compared with TL072CDR and OPA2134PA, AD8682ARMZ uniquely balances sub-250 μA power, <1 mV offset, and 20 pA bias current - making it the only option among the three qualified for long-life portable medical and geophysical sensor nodes.
Availability
AD8682ARMZ is available at Aetrix Electronics and suitable for portable medical instrumentation, strain gauge amplifiers, and loop filters requiring stable component supply across extended production lifecycles.
Supply support for AD8682ARMZ 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 R&D and manufacturing spanning 15+ countries.
The AD8682ARMZ belongs to Analog Devices' precision JFET op amp product line, engineered specifically for low-power, high-impedance signal acquisition in portable and battery-operated instrumentation systems.
FAQ
What is the maximum operating supply voltage for AD8682ARMZ?
The AD8682ARMZ 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 per Absolute Maximum Ratings Table 2. The device maintains specified performance across this full range, including PSRR >92 dB and output swing within 1.1 V of rails at ±15 V.
Does AD8682ARMZ require external compensation for unity-gain stability?
No, AD8682ARMZ is internally compensated and unity-gain stable. It drives capacitive loads up to 500 pF with <10% overshoot (Figure 5), eliminating need for external compensation networks in G = 1 noninverting configurations. This simplifies PCB layout in filter integrators and sensor buffers where phase margin must exceed 55°.
What is the input common-mode voltage range of AD8682ARMZ at ±15 V supplies?
At ±15 V supplies, AD8682ARMZ guarantees operation over −11 V to +15 V common-mode input voltage, covering the full positive rail and extending 11 V below the negative rail. This enables high-side current sensing (e.g., Figure 32) and direct interface to sensors biased near V+, without level-shifting circuitry.
How does AD8682ARMZ perform in terms of input offset voltage drift over temperature?
AD8682ARMZ has a maximum offset voltage drift of 10 μV/°C. Over the full −40°C to +85°C operating range, this results in ≤1.25 mV total drift (125°C × 10 μV/°C), added to the 3 mV max initial offset at cold temperatures. This low drift ensures stable DC accuracy in uncalibrated portable instruments operating across environmental extremes.
Is AD8682ARMZ pin-compatible with other packages of the AD8682 family?
AD8682ARMZ (MSOP-8, RM-8) shares identical pinout with AD8682ARZ (SOIC-8, R-8) per Figure 1, enabling drop-in replacement between packages. Both use the same 1–8 pin numbering: OUT A, –IN A, +IN A, V–, +IN B, –IN B, OUT B, V+. No PCB redesign is needed when migrating from SOIC to MSOP for space-constrained layouts.
AD8682ARMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
AD8682ARMZ FAQ
1.How can I place an order for AD8682ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8682ARMZ 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 AD8682ARMZ reliable?
The price and inventory of AD8682ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8682ARMZ is usually 5 days.
3.What payment methods are accepted for AD8682ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8682ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8682ARMZ?
AD8682ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8682ARMZ 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 AD8682ARMZ?
For technical support, including AD8682ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8682ARMZ requirements.
6.How does Aetrix verify that AD8682ARMZ is sourced from the original manufacturer or authorized distributors?
All AD8682ARMZ 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 AD8682ARMZ meets industry standards.
7.What is the process for return or replacement of AD8682ARMZ?
All AD8682ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8682ARMZ, 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 AD8682ARMZ part is unused and in its original packaging.
Return procedure for AD8682ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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