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Analog Devices Inc. AD8639ARMZ-R7
- Part No.:
- AD8639ARMZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8639ARMZ-R7.pdf
- Description:
- IC OPAMP ZERO-DRIFT 2 CIRC 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:146
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Product details
Overview
AD8639ARMZ-R7 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. It is qualified for automotive applications (−40°C to +125°C) and used in strain gage amplifiers and thermocouple interfaces where near-zero drift over temperature is critical.
For engineers reviewing the AD8639ARMZ-R7 datasheet, AD8639ARMZ-R7 pinout, AD8639ARMZ-R7 application, or AD8639ARMZ-R7 equivalent, key selection criteria include its guaranteed low offset drift across temperature, rail-to-rail output swing enabling full dynamic range utilization, absence of external capacitors, and qualification for automotive-grade reliability per AEC-Q100 requirements.
Technical Context
The AD8639ARMZ-R7 employs a patented dual-stage auto-zero + chopper ping-pong topology that eliminates 1/f noise while suppressing switching artifacts at 15 kHz-enabling true 16-bit accuracy in 5 kHz–10 kHz bandwidth systems. Its input stage uses high-impedance FETs (22.5 TΩ RIN) with 40 pA max bias current, and its output stage supports rail-to-rail swing with <15 mV VOL and >4.97 V VOH at 5 V supply.
Unlike conventional chopper-stabilized amplifiers, the AD8639ARMZ-R7 avoids digital switching noise injection into signal paths by integrating correlated double sampling and asynchronous nulling loops. Its overload recovery time is <50 μs-two clock cycles-due to fast internal loop settling, making it suitable for fast transient sensing in pressure and position feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | Max 9 μV at 25°C; ensures ≤9 mV output error at G=1000, critical for sub-μV-level sensor resolution. |
| Offset Drift | Max 0.04 μV/°C (MSOP package); guarantees <1 μV total drift over −40°C to +125°C, eliminating calibration rework. |
| CMRR | 133 dB typical; rejects >2 million:1 common-mode interference, essential for bridge sensor outputs in noisy environments. |
| Supply Range | ±2.5 V to ±8 V dual or 5 V to 16 V single; supports direct interface with 12 V automotive rails and isolated 5 V sensor domains. |
| Output Swing | Rail-to-rail; delivers ≥99.8% of supply range (e.g., 0.01 V to 4.99 V at 5 V), maximizing SNR without level-shifting circuitry. |
| Input Bias Current | Max 40 pA; enables use with high-Z sources like piezoresistive sensors and pH electrodes without significant voltage drop. |
| Gain Bandwidth | 1.35 MHz at 5 V; sufficient for closed-loop bandwidths up to ~100 kHz with G=10, supporting fast-response closed-loop control. |
Pinout & Package
AD8639ARMZ-R7 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 |
|---|---|---|
| OUT A (Pin 1) | Amplifier A output | Drives first signal path; rail-to-rail swing enables direct ADC interface without external level shifters. |
| −IN A (Pin 2) | Inverting input A | Accepts feedback or differential reference; requires input voltage within −0.1 V to VS+−2 V to avoid phase reversal. |
| +IN A (Pin 3) | Non-inverting input A | Connects to sensor node; 22.5 TΩ input resistance prevents loading of high-impedance transducers. |
| V− (Pin 4) | Negative supply / ground reference | Must be tied to system ground or negative rail; exposed pad must be soldered to PCB ground plane for thermal and noise performance. |
| +IN B (Pin 5) | Non-inverting input B | Second channel input; electrically isolated from Channel A-no crosstalk above −120 dB at 100 kHz. |
| −IN B (Pin 6) | Inverting input B | Independent feedback node; supports dual-sensor configurations (e.g., differential pressure + temperature compensation). |
| OUT B (Pin 7) | Amplifier B output | Provides second independent gain path; identical specs to OUT A-enables matched dual-channel instrumentation. |
| V+ (Pin 8) | Positive supply | Accepts 5–16 V; PSRR of 143 dB suppresses ripple from noisy DC-DC converters in automotive ECUs. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-zero + chopper hybrid architecture | Eliminates 1/f noise and reduces switching artifacts-delivers 1.2 μVp-p (0.1–10 Hz) without external filtering. |
| No external capacitors required | Reduces BOM count and board area; simplifies layout for space-constrained automotive modules and portable medical devices. |
| AEC-Q100 qualified (Grade 1) | Validated for −40°C to +125°C operation with lifetime reliability testing-meets automotive ECU and ADAS sensor requirements. |
| Rail-to-rail output with low output impedance | 4.2 Ω closed-loop ZOUT at 100 kHz enables direct driving of 10 kΩ ADC inputs with <0.01% gain error. |
| Overload recovery <50 μs | Enables accurate capture of fast transients (e.g., crash sensor spikes) without sustained output saturation errors. |
Applications
| Pressure Sensor Interface | Thermocouple Amplifier |
|---|---|
|
Use Scenario: Amplifying mV-level output from silicon piezoresistive pressure sensors in brake master cylinders and HVAC manifolds. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end-Channel A conditions bridge output, Channel B buffers cold-junction compensation voltage. Use Value: 0.04 μV/°C drift ensures <±0.1% FS error over full automotive temperature range, eliminating need for on-board calibration. |
Use Scenario: Cold-junction compensation and linearization of K-type thermocouples in engine coolant and exhaust gas temperature monitoring. IC Role / Device Role / Timing Role: Precision voltage follower (Channel A) for RTD reference and low-drift difference amplifier (Channel B) for thermocouple output. Use Value: 9 μV max offset contributes <±0.2°C error at 1000°C-meeting ASME B40.200 Class 1 accuracy requirements. |
| Strain Gage Load Cell | Automotive Current Sensing |
|
Use Scenario: Signal conditioning for full-bridge strain gages in seatbelt pretensioner actuators and suspension load sensors. IC Role / Device Role / Timing Role: Dual-opamp configured as programmable-gain instrumentation amplifier with matched gain paths. Use Value: 133 dB CMRR rejects common-mode noise from PWM motor drivers-maintaining >14-bit ENOB at 1 kHz. |
Use Scenario: High-side current sensing in 12 V battery management systems for start-stop and regenerative braking circuits. IC Role / Device Role / Timing Role: Precision difference amplifier measuring mV drop across shunt resistor; rail-to-rail output feeds 12-bit SAR ADC. Use Value: Rail-to-rail swing enables full-scale use of ADC range-improving resolution by 1 LSB compared to non-rail-to-rail alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8629ARMZ-R7 | Lower supply range (2.7–5 V), 1 μV/°C max drift, no automotive qualification. | Targeted at battery-powered portable instruments-not suitable for 12 V automotive rails or extended temperature operation. | Select only for low-voltage, non-automotive designs requiring ultra-low power (600 μA vs. 1.3 mA). |
| LTC2057HMS8#PBF | Higher offset drift (0.05 μV/°C), wider supply (2.7–12 V), no AEC-Q100 rating. | Used in industrial process controllers; lacks automotive qualification and fails 125°C long-term reliability testing. | Consider only if design does not require automotive qualification and can accept higher drift-induced error at extremes. |
Compared with AD8629ARMZ-R7 and LTC2057HMS8#PBF, AD8639ARMZ-R7 uniquely combines AEC-Q100 Grade 1 qualification, 16 V supply support, and 0.04 μV/°C drift-making it the sole option for high-reliability automotive sensor nodes demanding zero recalibration over lifetime.
Availability
AD8639ARMZ-R7 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial strain gage systems, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8639ARMZ-R7 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 AD8639ARMZ-R7 belongs to Analog Devices' auto-zero op amp product line, engineered specifically for ultra-precision DC-coupled measurement in harsh environments-including automotive, aerospace, and medical instrumentation-where offset stability over temperature and time is non-negotiable.
FAQ
What is the operating temperature range for AD8639ARMZ-R7?
The AD8639ARMZ-R7 is specified for −40°C to +125°C, meeting AEC-Q100 Grade 1 requirements for automotive under-hood applications. This range is validated across all electrical parameters including offset voltage, CMRR, and supply current-ensuring consistent performance in engine control units and transmission sensors.
Does AD8639ARMZ-R7 require external capacitors for auto-zero stabilization?
No, AD8639ARMZ-R7 requires no external capacitors. Its integrated auto-zero architecture uses on-chip storage elements and a 15 kHz internal clock, eliminating the need for external timing or stabilization components-reducing PCB area and improving reliability in vibration-prone automotive modules.
Is AD8639ARMZ-R7 pin-compatible with other dual op amps in MSOP-8 packages?
AD8639ARMZ-R7 follows standard MSOP-8 pinout (RM-8) but is not functionally pin-compatible with generic dual op amps due to its dedicated V− pin (Pin 4) and exposed thermal pad requirement. Interchange requires verification of supply routing, grounding, and thermal pad connection per Analog Devices' layout guidelines.
How does AD8639ARMZ-R7 handle overload recovery compared to standard precision op amps?
AD8639ARMZ-R7 recovers from output saturation in <50 μs-two internal clock cycles-due to optimized nulling loop dynamics. Standard precision op amps typically require milliseconds, causing data loss in fast transient detection; AD8639ARMZ-R7 maintains signal integrity in crash sensors and ignition monitoring.
Can AD8639ARMZ-R7 be used with single-supply 3.3 V systems?
No-AD8639ARMZ-R7 minimum supply is 5 V (single) or ±2.5 V (dual). Its input voltage range starts at −0.1 V and extends to VS+−2 V; at 3.3 V, the usable common-mode range collapses below 1.3 V, violating specification limits and risking phase reversal or ESD diode conduction.
AD8639ARMZ-R7 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:
- 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-MSOP
AD8639ARMZ-R7 FAQ
1.How can I place an order for AD8639ARMZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8639ARMZ-R7 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 AD8639ARMZ-R7 reliable?
The price and inventory of AD8639ARMZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8639ARMZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8639ARMZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8639ARMZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8639ARMZ-R7?
AD8639ARMZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8639ARMZ-R7 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 AD8639ARMZ-R7?
For technical support, including AD8639ARMZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8639ARMZ-R7 requirements.
6.How does Aetrix verify that AD8639ARMZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8639ARMZ-R7 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 AD8639ARMZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8639ARMZ-R7?
All AD8639ARMZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8639ARMZ-R7, 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 AD8639ARMZ-R7 part is unused and in its original packaging.
Return procedure for AD8639ARMZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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