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Analog Devices Inc. AD8638ARZ-REEL7
- Part No.:
- AD8638ARZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8638ARZ-REEL7.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,651
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Product details
Overview
AD8638ARZ-REEL7 from Analog Devices is a single-channel, auto-zero operational amplifier optimized for ultra-precision dc-coupled signal conditioning. It delivers 9 μV maximum offset voltage, 0.04 μV/°C max drift (SOT-23), rail-to-rail output swing, and operates from 5 V to 16 V single supply - enabling high-accuracy amplification in pressure sensors, thermocouple interfaces, and medical instrumentation.
For engineers reviewing the AD8638ARZ-REEL7 datasheet, AD8638ARZ-REEL7 pinout, AD8638ARZ-REEL7 application, or AD8638ARZ-REEL7 equivalent, key selection criteria include verified sub-10 μV offset, guaranteed 136 dB open-loop gain, 1.3 mA max supply current, and SOT-23-5 package compatibility with space-constrained precision analog front-ends.
Technical Context
The AD8638ARZ-REEL7 employs a patented dual-stage auto-zero + chopper ping-pong architecture that eliminates 1/f noise while suppressing switching artifacts at 15 kHz. This enables true 16-bit accuracy up to 10 kHz signal bandwidth without external filtering.
It features fully differential input stage with 22.5 TΩ input resistance, 4 pF differential input capacitance, and rail-to-rail output capable of driving 2 kΩ loads within 32 mV of rails at 16 V supply - all specified across −40°C to +125°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 3 μV typical / 9 μV max - ensures ≤0.9 mV output error at G=100, critical for strain gage and current shunt sensing. |
| Offset Drift (SOT-23) | 0.04 μV/°C max - guarantees <1 μV total drift over −40°C to +125°C, eliminating calibration in automotive sensor modules. |
| Supply Range | 5 V to 16 V single supply - supports direct interfacing with 12 V industrial buses and 15 V DAC references without level-shifting. |
| Open-Loop Gain | 136 dB typical - provides ≥10⁶ closed-loop accuracy at G=1000, essential for precision reference buffering. |
| CMRR | 133 dB typical - rejects >2 million-to-1 common-mode interference, enabling stable operation in noisy motor-control environments. |
| Output Swing | Rail-to-rail - delivers full 0–15.96 V output at 16 V supply into 10 kΩ, maximizing dynamic range and SNR in data acquisition systems. |
| Input Bias Current | 40 pA max - prevents >0.4 mV error across 10 MΩ sensor sources, suitable for high-impedance pH and ion-selective electrodes. |
Pinout & Package
AD8638ARZ-REEL7 is packaged in a 5-lead SOT-23 (RJ-5) with exposed pad connected to V−. Pin 1 = OUT, Pin 2 = V−, Pin 3 = +IN, Pin 4 = −IN, Pin 5 = V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Capable of sourcing/sinking ±19 mA; rail-to-rail swing enables direct interface with SAR ADCs and low-voltage logic. |
| 2 (V−) | Negative supply rail | Must be connected to system ground or negative rail; exposed thermal pad tied to V− improves thermal stability and PSRR. |
| 3 (+IN) | Non-inverting input | High-impedance node (22.5 TΩ); requires guard ring routing to minimize leakage in µV-level measurements. |
| 4 (−IN) | Inverting input | Differential pair input; sensitive to ESD - must remain within −0.1 V to +14 V at 16 V supply to avoid phase reversal. |
| 5 (V+) | Positive supply rail | Accepts 5–16 V; PSRR of 143 dB suppresses ripple from switch-mode power supplies feeding sensor subsystems. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-zero + chopper hybrid topology | Eliminates 1/f noise internally; achieves 1.2 μV p-p (0.1–10 Hz) without external filtering - reduces BOM count in portable medical devices. |
| Overload recovery time | <50 μs - recovers in under two internal clock cycles after saturation, enabling fast settling in multiplexed sensor arrays. |
| No external capacitors required | Stable with 20 pF load at unity gain - simplifies layout and avoids instability risks in high-density PCBs. |
| Extended temperature range | Specified from −40°C to +125°C - qualified for under-hood automotive pressure transducers and industrial motor feedback circuits. |
| Low supply current | 1.3 mA max - enables battery-powered precision instrumentation with >1-year runtime on coin-cell batteries. |
Applications
| Pressure and Position Sensors | Medical Instrumentation |
|---|---|
Use Scenario: Amplifying mV-level outputs from piezoresistive pressure bridges in HVAC and industrial control systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with gain ≥1000 and sub-μV offset stability over temperature. Use Value: Enables direct 16-bit ADC digitization without zero-drift correction firmware, reducing MCU overhead and calibration complexity. |
Use Scenario: Signal conditioning for ECG, EEG, and EMG biopotential electrodes requiring ultra-low noise and high CMRR. IC Role / Device Role / Timing Role: First-stage dc-coupled amplifier with 1.2 μV p-p 0.1–10 Hz noise and 133 dB CMRR to reject 50/60 Hz mains interference. Use Value: Achieves diagnostic-grade signal fidelity without notch filters, preserving waveform integrity for arrhythmia detection algorithms. |
| Thermocouple Amplifiers | Precision Current Sensing |
Use Scenario: Cold-junction compensation and linearization of Type-K/J thermocouples in furnace controllers and lab equipment. IC Role / Device Role / Timing Role: Low-drift, rail-to-rail output op-amp configured as difference amplifier with matched resistor networks. Use Value: Maintains <±1°C accuracy over −40°C to +125°C ambient without periodic recalibration, meeting IEC 61511 functional safety requirements. |
Use Scenario: High-side current monitoring in 12 V/24 V industrial power supplies and motor drives using 10 mΩ shunts. IC Role / Device Role / Timing Role: Zero-drift current-sense amplifier with 40 pA bias current to minimize offset error across wide temperature range. Use Value: Delivers ±0.1% full-scale accuracy at 100 A measurement with no gain/offset trimming, reducing test time and component cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8628ARZ | 2.7–5 V supply only; 1 μV typ offset but limited to 5 V max - not usable in 12/16 V systems. | Targeted at low-voltage portable electronics; lacks extended supply range and automotive qualification. | Select AD8628ARZ only when operating strictly below 5 V and lowest possible offset is mandatory. |
| LTC2057HS5#TRMPBF | Higher 0.5 μV max offset drift (0.05 μV/°C), 1.8 mA supply current, SO-8 package - larger footprint and higher power. | Optimized for ultra-low drift in aerospace-grade instrumentation; no SOT-23 option available. | Choose LTC2057HS5#TRMPBF when drift budget is tighter than 0.04 μV/°C and board area is not constrained. |
Compared with AD8638ARZ-REEL7, AD8628ARZ sacrifices supply flexibility for marginally lower offset, while LTC2057HS5#TRMPBF trades package size and power for enhanced drift performance - making AD8638ARZ-REEL7 the optimal balance of precision, voltage range, and miniaturization for industrial sensor nodes.
Availability
AD8638ARZ-REEL7 is available at Aetrix Electronics and suitable for pressure transducers, thermocouple interfaces, and medical biosignal acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8638ARZ-REEL7 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 AD8638 is part of Analog Devices' auto-zero op-amp family designed specifically for ultra-precision dc signal chains in harsh environments - emphasizing near-zero drift, rail-to-rail output, and robust operation from −40°C to +125°C.
FAQ
What is the maximum supply voltage for AD8638ARZ-REEL7?
The AD8638ARZ-REEL7 has an absolute maximum supply voltage rating of 16 V, with recommended operation from 5 V to 16 V single supply (or ±2.5 V to ±8 V dual supply). Exceeding 16 V risks permanent damage per Absolute Maximum Ratings table. The device maintains full specification compliance across this entire range, including 136 dB gain and 133 dB CMRR at both 5 V and 16 V operation.
Does AD8638ARZ-REEL7 require external capacitors for stability?
No, AD8638ARZ-REEL7 is internally compensated and stable with capacitive loads up to 20 pF at unity gain, as confirmed in the Typical Performance Characteristics section. No external compensation capacitors are needed - simplifying layout and eliminating risk of peaking or oscillation in standard gain configurations. For loads >20 pF, a small series resistor (e.g., 10–50 Ω) at the output is recommended.
Is AD8638ARZ-REEL7 qualified for automotive applications?
No - AD8638ARZ-REEL7 is the commercial/industrial grade variant. The automotive-qualified version is AD8639 (dual) and AD8638A (automotive-grade single), which undergo AEC-Q100 stress testing. AD8638ARZ-REEL7 operates across −40°C to +125°C but lacks automotive-specific reliability documentation, traceability, and PPAP support required for Tier-1 vehicle systems.
What is the input voltage range limitation for AD8638ARZ-REEL7 at 16 V supply?
At 16 V supply, the AD8638ARZ-REEL7 input common-mode voltage range is specified from −0.1 V to +14 V. Inputs must remain within this window to prevent phase reversal or ESD diode conduction. Exceeding +14 V (e.g., by >0.3 V above V+) forward-biases internal clamp diodes, risking damage if input current exceeds 10 mA - external series resistors are mandatory for overvoltage protection.
How does the auto-zero + chopper architecture reduce noise in AD8638ARZ-REEL7?
The AD8638ARZ-REEL7 uses a patented ping-pong arrangement combining auto-zeroing and chopping at 15 kHz. This cancels 1/f noise internally while minimizing switching artifacts - achieving 1.2 μV p-p (0.1–10 Hz) and 60 nV/√Hz at 1 kHz. Unlike pure chopper amps, it avoids large spectral spikes; unlike pure auto-zero amps, it suppresses aliased wideband noise - delivering clean, filter-free precision for dc-coupled measurements.
AD8638ARZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- 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
- 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
AD8638ARZ-REEL7 FAQ
1.How can I place an order for AD8638ARZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8638ARZ-REEL7 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 AD8638ARZ-REEL7 reliable?
The price and inventory of AD8638ARZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8638ARZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD8638ARZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8638ARZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8638ARZ-REEL7?
AD8638ARZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8638ARZ-REEL7 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 AD8638ARZ-REEL7?
For technical support, including AD8638ARZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8638ARZ-REEL7 requirements.
6.How does Aetrix verify that AD8638ARZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD8638ARZ-REEL7 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 AD8638ARZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD8638ARZ-REEL7?
All AD8638ARZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8638ARZ-REEL7, 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 AD8638ARZ-REEL7 part is unused and in its original packaging.
Return procedure for AD8638ARZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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