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Analog Devices Inc. AD8682ARMZ-REEL
- Part No.:
- AD8682ARMZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8682ARMZ-REEL.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
AD8682ARMZ-REEL from Analog Devices is a dual-channel, low-power, high-speed JFET-input operational amplifier optimized for precision signal conditioning in battery-powered and high-impedance source applications. It delivers 9 V/μs slew rate, 3.5 MHz gain bandwidth, and ≤1 mV offset voltage at 25°C, with supply current of only 250 μA per amplifier. It is used in portable medical instrumentation, loop filters, and strain gauge amplifiers where low bias current (≤20 pA) and rail-to-rail input capability (−11 V to +15 V) are critical.
For engineers reviewing the AD8682ARMZ-REEL datasheet, AD8682ARMZ-REEL pinout, AD8682ARMZ-REEL application, or AD8682ARMZ-REEL equivalent, key selection criteria include input bias current stability over temperature, unity-gain stability with capacitive loads, CMRR performance across frequency, and compatibility with ±4.5 V to ±18 V dual supplies in space-constrained designs using the 8-lead MSOP package.
Technical Context
The AD8682ARMZ-REEL employs a JFET input stage enabling ultra-low input bias current (≤20 pA @ 25°C, ≤125 pA over −40°C to +85°C) and high input impedance (>1012 Ω), making it suitable for sensor interfaces with megohm-level source impedances. Its unity-gain stable architecture supports direct use in noninverting configurations driving ≥100 pF loads 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 transient signals in active filters and integrators. The device maintains 90 dB typical CMRR and 114 dB PSRR across its operating temperature range, ensuring robust performance in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amplifier | 250 μA max - enables multi-channel operation on single coin-cell or low-power LDO rails |
| Slew Rate | 9 V/μs typical - supports faithful reproduction of 100 kHz full-scale square waves at ±15 V |
| Gain Bandwidth Product | 3.5 MHz - allows stable closed-loop gain ≥10 at 350 kHz with phase margin ≥55° |
| Input Offset Voltage | 1 mV max @ 25°C - ensures ≤10 mV error in 10× gain circuits without trimming |
| Input Bias Current | 20 pA max @ 25°C - minimizes voltage error across 10 MΩ source resistors (≤200 μV) |
| Common-Mode Range | −11 V to +15 V - supports high-side current sensing up to +15 V rail with no level-shifting |
| Operating Temperature | −40°C to +85°C - qualified for industrial and portable medical equipment deployments |
Pinout & Package
AD8682ARMZ-REEL is housed in an 8-lead Mini Small Outline Package (MSOP, RM-8), measuring 3.0 mm × 3.0 mm × 0.85 mm with 0.65 mm lead pitch. This thermally enhanced, surface-mount package provides improved power dissipation (θJA = 210°C/W) versus SOIC_N and suits compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT A | Amplifier A output | Drives load directly; capable of ±13.9 V swing into 10 kΩ with ±15 V supplies |
| 2 - –IN A | Inverting input of Amp A | High-impedance node; requires guarding in high-Z sensor paths to minimize leakage |
| 3 - +IN A | Noninverting input of Amp A | Accepts common-mode voltages up to +15 V - enables true high-side sensing |
| 4 - V– | Negative supply rail | Must be decoupled locally with ≥0.1 μF ceramic capacitor to suppress PSRR degradation |
| 5 - +IN B | Noninverting input of Amp B | Independent of Amp A; supports dual-channel differential or independent signal paths |
| 6 - –IN B | Inverting input of Amp B | Matches Amp A specs; usable for feedback networks in active filter topologies |
| 7 - OUT B | Amplifier B output | Electrically identical to OUT A; supports dual integrator or dual filter stages |
| 8 - V+ | Positive supply rail | Accepts up to ±18 V; PSRR >92 dB ensures immunity to supply ripple up to 100 kHz |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | ≤20 pA @ 25°C - preserves signal integrity in piezoelectric, pH, and photodiode front-ends |
| Unity-gain stable | Operates unconditionally at G = 1 with ≥100 pF capacitive load - eliminates need for isolation resistor |
| Wide supply range | ±4.5 V to ±18 V - supports legacy ±15 V systems and modern low-voltage ±5 V designs |
| Low offset drift | 10 μV/°C max - limits thermal-induced error to <100 μV over 10°C ambient shift |
| High CMRR | 90 dB typical - rejects 10 mV common-mode interference as <10 μV differential error |
| Fast settling time | 1.6 μs to 0.01% - enables precise sampling in 16-bit data acquisition with minimal dead time |
Applications
| Portable Medical Instrumentation | Strain Gauge Amplification |
|---|---|
|
Use Scenario: Amplifying microvolt-level ECG or EEG signals in handheld diagnostic devices powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with ultra-low input current, rejecting electrode polarization voltages while preserving signal fidelity. Use Value: 20 pA input bias ensures <2 μV error across 100 MΩ electrode impedance, extending battery life via 250 μA/channel quiescent draw. |
Use Scenario: Conditioning Wheatstone bridge outputs from load cells in portable weighing scales or torque sensors. IC Role / Device Role / Timing Role: Low-drift, high-CMRR instrumentation amplifier front-end (configured as difference amplifier) rejecting bridge common-mode shifts. Use Value: 1 mV max offset and 90 dB CMRR enable resolution of <0.05% full-scale strain changes without calibration drift over temperature. |
| Loop Filter for PLLs | Active Precision Filter |
|
Use Scenario: Implementing 2nd-order passive/active loop filters in frequency synthesizers for wireless transceivers. IC Role / Device Role / Timing Role: Integrator and summing node in charge-pump PLL feedback path, requiring low noise and predictable phase response. Use Value: 36 nV/√Hz voltage noise and 3.5 MHz GBW ensure jitter <1 ps RMS in 100 kHz loop bandwidth designs. |
Use Scenario: Building 4th-order Butterworth low-pass filters in audio anti-aliasing or sensor signal conditioning stages. IC Role / Device Role / Timing Role: Dual op-amp core in biquad topology, providing gain, Q control, and cutoff frequency accuracy. Use Value: Unity-gain stability and 9 V/μs slew rate support clean 200 kHz passband with <0.01% THD+N at 1 VOUT. |
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 supply current (1.1 mA/amp), wider offset range (±2 mV) | Less suitable for high-speed filter or fast-settling integrator use; better for cost-sensitive general-purpose apps | Choose when budget constraints outweigh speed/power trade-offs and ±2 mV offset is acceptable |
| OPA2134PA | Higher supply current (4 mA/amp), lower input bias (1 pA), wider GBW (8 MHz) | Better for ultra-high-Z sources but incompatible with sub-500 μA system budgets | Choose when femtoamp bias and 8 MHz bandwidth justify 16× higher quiescent power |
Compared with TLC2272CDR and OPA2134PA, AD8682ARMZ-REEL uniquely balances 9 V/μs slew rate, 250 μA/channel supply current, and ≤20 pA input bias - making it optimal for portable instrumentation where speed, power, and input impedance must coexist within tight thermal and battery-life constraints.
Availability
AD8682ARMZ-REEL is available at Aetrix Electronics and suitable for portable medical instrumentation, loop filters, and strain gauge amplifiers requiring stable component supply across extended production lifecycles.
Supply support for AD8682ARMZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD868x family was designed specifically for low-power, high-precision signal conditioning in portable and battery-operated equipment - emphasizing JFET input performance, rail-compatible common-mode range, and unity-gain stability in miniature packages.
FAQ
What is the maximum operating supply voltage for AD8682ARMZ-REEL?
The AD8682ARMZ-REEL supports a supply voltage range of ±4.5 V to ±18 V. Absolute maximum ratings specify ±18 V on both V+ and V− pins; exceeding this risks permanent damage. Operation at ±15 V is typical in precision applications, delivering specified slew rate, bandwidth, and output swing per the Rev. B datasheet.
Does AD8682ARMZ-REEL support high-side current sensing?
Yes, AD8682ARMZ-REEL supports high-side current sensing due to its extended common-mode input voltage range of −11 V to +15 V - which includes the positive supply rail. This allows direct amplification of voltage drops across shunt resistors placed between load and V+, eliminating the need for level-shifting circuitry in supply monitoring applications.
Is AD8682ARMZ-REEL unity-gain stable with capacitive loads?
Yes, AD8682ARMZ-REEL is unity-gain stable and characterized to drive ≥100 pF capacitive loads in noninverting configuration without oscillation. Figure 5 in the Rev. B datasheet confirms <5% overshoot up to 500 pF with 2 kΩ load, validating robust stability for driving ADC inputs or long PCB traces without external compensation.
What is the thermal resistance (θJA) of the AD8682ARMZ-REEL package?
The AD8682ARMZ-REEL uses an 8-lead MSOP (RM-8) package with a junction-to-ambient thermal resistance (θJA) of 210°C/W, as specified in Table 3 of the Rev. B datasheet. This value assumes standard JEDEC 2S2P test board conditions; actual PCB layout with thermal vias can reduce effective θJA by 30–50%.
How does input bias current vary with temperature for AD8682ARMZ-REEL?
AD8682ARMZ-REEL specifies input bias current ≤20 pA at 25°C and ≤125 pA over the full −40°C to +85°C operating range. Figure 8 shows monotonic increase to ~80 pA at +85°C under ±15 V supplies, confirming JFET input stability - critical for maintaining accuracy in wide-temperature industrial sensor nodes.
AD8682ARMZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-REEL FAQ
1.How can I place an order for AD8682ARMZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8682ARMZ-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 AD8682ARMZ-REEL reliable?
The price and inventory of AD8682ARMZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8682ARMZ-REEL is usually 5 days.
3.What payment methods are accepted for AD8682ARMZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8682ARMZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8682ARMZ-REEL?
AD8682ARMZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8682ARMZ-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 AD8682ARMZ-REEL?
For technical support, including AD8682ARMZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8682ARMZ-REEL requirements.
6.How does Aetrix verify that AD8682ARMZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD8682ARMZ-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 AD8682ARMZ-REEL meets industry standards.
7.What is the process for return or replacement of AD8682ARMZ-REEL?
All AD8682ARMZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8682ARMZ-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 AD8682ARMZ-REEL part is unused and in its original packaging.
Return procedure for AD8682ARMZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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