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Analog Devices Inc. AD8639WARZ
- Part No.:
- AD8639WARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8639WARZ.pdf
- Description:
- IC OPAMP ZERO-DRIFT 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,789
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Product details
Overview
AD8639WARZ from Analog Devices is a dual, rail-to-rail output, auto-zero operational amplifier optimized for precision sensor signal conditioning in automotive and industrial systems. It delivers 9 μV max offset voltage, 0.04 μV/°C max drift, 136 dB typical CMRR, and operates from ±2.5 V to ±8 V or 5 V to 16 V supplies - enabling high-accuracy strain gage and thermocouple amplification in harsh environments.
For engineers reviewing the AD8639WARZ datasheet, AD8639WARZ pinout, AD8639WARZ application, or AD8639WARZ equivalent, this page provides verified pin functions, automotive-grade temperature validation (−40°C to +125°C), rail-to-rail output swing implications for SNR maximization, and confirmed alternative options for low-drift dual op-amp replacement.
Technical Context
The AD8639WARZ employs a patented ping-pong auto-zeroing + chopping topology that eliminates 1/f noise internally while suppressing switching artifacts at 15 kHz - achieving 1.2 μV p-p (0.1 Hz–10 Hz) noise without external filtering. Its dual-channel architecture shares no internal coupling path between amplifiers, ensuring independent operation.
It is not rail-to-rail input: input common-mode range is limited to −0.1 V to +14 V (at 16 V supply), requiring external clamping or series resistance if inputs approach supply rails. Output phase reversal is eliminated as long as inputs remain within spec - critical for closed-loop stability in precision current sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | Max 9 μV at 25°C; ensures ≤9 mV error at G=1000 - enables direct 16-bit DAC output buffering without trimming. |
| Offset Drift | Max 0.04 μV/°C (MSOP package); guarantees <1 μV total drift over −40°C to +125°C - eliminates calibration in automotive cabin sensors. |
| CMRR | 133 dB typical; rejects >2 million:1 common-mode interference - essential for bridge-based pressure transducers with millivolt outputs. |
| Rail-to-Rail Output | Swings to within 15 mV of rails (16 V supply); maximizes dynamic range in single-supply data acquisition systems. |
| Supply Range | ±2.5 V to ±8 V dual or 5 V to 16 V single; supports direct interface with 12 V automotive batteries and isolated 5 V microcontroller domains. |
| Gain Bandwidth | 1.5 MHz at 16 V; sufficient for 10 kHz sensor bandwidth with ≥60° phase margin - stable with 20 pF capacitive loads. |
| Input Bias Current | Max 40 pA at 25°C; avoids >100 mV error across 10 GΩ thermistor networks - preserves accuracy in high-impedance medical electrode circuits. |
Pinout & Package
AD8639WARZ is packaged in an 8-lead MSOP (RM-8) with exposed pad connected to V–. Pin 1 = OUT A, Pin 2 = –IN A, Pin 3 = +IN A, Pin 4 = V–, Pin 5 = +IN B, Pin 6 = –IN B, Pin 7 = OUT B, Pin 8 = V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Drives external load; rail-to-rail swing enables full utilization of ADC reference voltage. |
| 2 (–IN A) | Inverting input A | Accepts feedback network; requires impedance matching to +IN A to minimize bias-current-induced offset. |
| 3 (+IN A) | Non-inverting input A | High-impedance node; must stay within −0.1 V to +14 V common-mode range to avoid ESD diode conduction. |
| 4 (V–) | Negative supply | Must be connected to system ground or negative rail; exposed pad soldered to PCB ground plane for thermal and noise control. |
| 5 (+IN B) | Non-inverting input B | Independent of Channel A; supports dual-sensor configurations (e.g., differential thermocouple + reference junction). |
| 6 (–IN B) | Inverting input B | Configurable for unity-gain buffer or gain stage; no crosstalk with Channel A per datasheet isolation specs. |
| 7 (OUT B) | Amplifier B output | Electrically isolated output; allows simultaneous processing of two analog signals without shared supply-path noise. |
| 8 (V+) | Positive supply | Accepts 16 V max; PSRR of 143 dB suppresses ripple from noisy DC/DC converters in automotive ECUs. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-zero + chopping topology | Eliminates 1/f noise internally - removes need for external low-pass filters in precision DC measurements. |
| No external capacitors required | Reduces BOM count and board space; simplifies layout for space-constrained automotive modules. |
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C) - validated for engine control, brake pressure, and cabin air quality sensors. |
| Overload recovery time | <50 μs - prevents signal corruption during transient events (e.g., ignition spikes or load dump). |
| Low digital switching noise | 15 kHz internal clock frequency - avoids interference with sensitive RF or audio bands in infotainment systems. |
Applications
| Pressure Sensor Signal Conditioning | Medical Electrode Amplification |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge output from MEMS pressure sensors in brake master cylinders. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end: Channel A buffers reference voltage, Channel B amplifies bridge differential output. Use Value: 0.04 μV/°C drift ensures ≤0.5% full-scale error over automotive temperature range - meets ISO 26262 ASIL-B functional safety requirements. | Use Scenario: Biopotential signal acquisition from dry-contact ECG electrodes with high source impedance (>1 MΩ). IC Role / Device Role / Timing Role: First-stage ultra-low-bias current amplifier with guard drive capability via matched input structure. Use Value: 40 pA max input bias current prevents >100 mV DC offset - eliminates baseline wander without AC coupling or active guarding. |
| Thermocouple Cold-Junction Compensation | Precision Current Shunt Monitoring |
Use Scenario: Measuring Type-K thermocouple output while simultaneously sensing cold-junction temperature with on-board RTD. IC Role / Device Role / Timing Role: Dual op-amp: one channel conditions thermocouple voltage (high gain, low noise), second channels amplifies RTD bridge (low drift, ratiometric). Use Value: Matched drift (0.04 μV/°C) between channels minimizes cold-junction compensation error - achieves ±0.5°C accuracy from −40°C to +125°C. | Use Scenario: Bidirectional current sensing in 48 V mild-hybrid battery management systems using 500 μΩ shunt resistors. IC Role / Device Role / Timing Role: High-side current sense amplifier with rail-to-rail output driving 16-bit SAR ADC reference range. Use Value: 9 μV offset translates to <0.02 A error at 100 A full scale - enables precise state-of-charge estimation with <0.5% SOC error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8629ARMZ | Lower supply range (2.7 V–5 V), higher offset drift (0.1 μV/°C), same auto-zero architecture | Optimized for low-voltage portable medical devices, not automotive 12 V systems | Select when operating below 5 V or prioritizing ultra-low power over wide-temp stability |
| LTC2053CMS8#PBF | Higher supply voltage (up to 18 V), 0.25 μV/°C drift, chopper-only topology with higher EMI susceptibility | Used in industrial process control where EMC is less stringent than automotive | Choose for higher voltage headroom where 1/f noise elimination is secondary to cost |
Compared with AD8629ARMZ and LTC2053CMS8#PBF, AD8639WARZ uniquely combines AEC-Q100 qualification, 0.04 μV/°C drift, and 16 V operation - making it the only option qualified for under-hood automotive sensor front-ends requiring both precision and reliability.
Availability
AD8639WARZ is available at Aetrix Electronics and suitable for automotive sensor modules, medical diagnostic equipment, and industrial pressure transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8639WARZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD8639 belongs to Analog Devices' auto-zero op-amp product line, engineered specifically for applications demanding near-zero drift, ultra-low offset, and robust operation in automotive and industrial environments.
FAQ
What is the maximum supply voltage rating for AD8639WARZ?
The absolute maximum supply voltage for AD8639WARZ is 16 V across V+ and V– terminals. Operation beyond this risks permanent damage per the Absolute Maximum Ratings table. For reliable long-term use in automotive applications, Analog Devices specifies continuous operation up to 16 V with derating above 125°C junction temperature - consistent with AD8639WARZ's AEC-Q100 Grade 1 qualification.
Does AD8639WARZ support true rail-to-rail input operation?
No, AD8639WARZ does not support rail-to-rail input. Its input common-mode voltage range is specified as −0.1 V to +14 V at 16 V supply. Exceeding these limits forward-biases internal ESD protection diodes, risking latch-up or damage. Input signals must be kept ≥2 V below V+ and ≥0.3 V above V– - a key design constraint confirmed in the General Description and Input Voltage Range sections of the AD8639WARZ datasheet.
What is the thermal performance of AD8639WARZ in its MSOP package?
AD8639WARZ in the 8-lead MSOP (RM-8) package has a junction-to-ambient thermal resistance (θJA) of 206°C/W and junction-to-case (θJC) of 44°C/W, per Table 5. This means at 1.5 mA per amplifier (3 mA total) and 16 V supply, power dissipation is ~48 mW - resulting in ~10°C junction rise above ambient under still-air conditions. The exposed pad must be soldered to a thermal pad for optimal performance, as noted in Figure 3 and the Thermal Resistance section.
How does AD8639WARZ handle overload recovery compared to standard auto-zero op-amps?
AD8639WARZ recovers from output saturation in less than 50 μs - significantly faster than legacy auto-zero amplifiers (which often require milliseconds). This is achieved by synchronizing internal nulling loops to a 15 kHz clock, allowing full settling within two clock cycles after overload. This behavior is explicitly measured and documented in Figures 31–34 and the Overload Recovery Time specification - critical for maintaining signal integrity in fast-transient environments like engine control units.
Is AD8639WARZ pin-compatible with other dual op-amps in MSOP-8 packages?
No, AD8639WARZ is not pin-compatible with generic dual op-amps such as LM358 or AD8602 in MSOP-8. Its pinout (OUT A, –IN A, +IN A, V–, +IN B, –IN B, OUT B, V+) follows a non-standard sequence optimized for dual independent operation and thermal symmetry. Substitution requires PCB layout revision - confirmed by comparison with Figure 3 (AD8639 MSOP pinout) and absence of any "pin-compatible" claim in the datasheet's Ordering Guide or Features sections.
AD8639WARZ 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:
- Chopper (Zero-Drift)
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 1.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 3 µV
- Current - Supply:
- 1.25mA (x2 Channels)
- Current - Output / Channel:
- 37 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:
- 8-SOIC
AD8639WARZ FAQ
1.How can I place an order for AD8639WARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8639WARZ 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 AD8639WARZ reliable?
The price and inventory of AD8639WARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8639WARZ is usually 5 days.
3.What payment methods are accepted for AD8639WARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8639WARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8639WARZ?
AD8639WARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8639WARZ 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 AD8639WARZ?
For technical support, including AD8639WARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8639WARZ requirements.
6.How does Aetrix verify that AD8639WARZ is sourced from the original manufacturer or authorized distributors?
All AD8639WARZ 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 AD8639WARZ meets industry standards.
7.What is the process for return or replacement of AD8639WARZ?
All AD8639WARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8639WARZ, 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 AD8639WARZ part is unused and in its original packaging.
Return procedure for AD8639WARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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