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Analog Devices Inc. AD8629ARZ-REEL
- Part No.:
- AD8629ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8629ARZ-REEL.pdf
- Description:
- IC OPAMP ZERO-DRIFT 2 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,243
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Product details
Overview
AD8629ARZ-REEL from Analog Devices is a zero-drift, rail-to-rail input/output operational amplifier optimized for precision DC-coupled sensing. It delivers 1 µV offset voltage, 0.002 µV/°C drift, 130 dB CMRR, 2.5 MHz gain bandwidth, and 1.0 mA supply current - enabling high-accuracy signal conditioning in automotive pressure sensors and medical thermocouple amplifiers.
For engineers reviewing the AD8629ARZ-REEL datasheet, AD8629ARZ-REEL pinout, AD8629ARZ-REEL application, or AD8629ARZ-REEL equivalent, this page provides verified package mapping (SOIC_N-8), confirmed pin functions, real-world use-value metrics for low-drift current sensing and IR preamplification, and two validated alternative op-amps with documented parameter-level differences.
Technical Context
The AD8629ARZ-REEL implements a patented dual-stage auto-zero + chopping architecture operating at 15 kHz, eliminating 1/f noise while suppressing switching artifacts - unlike single-mode chopper or auto-zero amplifiers. Its rail-to-rail input stage supports common-mode voltages from GND to VS, and its output swings within 1 mV of rails under light load.
This topology enables stable 16-bit accuracy in systems with 5–10 kHz signal bandwidths, achieves <10 µs overload recovery via two-clock-cycle internal settling, and maintains <10 µV total offset error over −40°C to +125°C without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 1 µV typical - eliminates need for system-level offset calibration in 16-bit DAC output stages (LSB = 38 µV @ 2.5 V ref). |
| Offset Drift | 0.002 µV/°C max - ensures <0.25 µV total drift over full −40°C to +125°C range, critical for uncalibrated automotive sensor modules. |
| CMRR / PSRR | 130 dB min - rejects >99.99% of power supply ripple and common-mode interference in noisy engine control environments. |
| Input Bias Current | 100 pA max - introduces <10 nV error across 100 kΩ sensor impedance, preserving accuracy in photodiode and strain gage interfaces. |
| Gain Bandwidth | 2.5 MHz - supports closed-loop gains up to 250 with ≥20 kHz small-signal bandwidth for fast thermopile transient response. |
| Supply Current | 1.0 mA - enables battery-powered portable medical instruments with >100-hour runtime on coin-cell batteries. |
| Output Swing | Within 1 mV of rails (RL = 100 kΩ) - maximizes dynamic range in 5 V single-supply systems without level-shifting circuitry. |
Pinout & Package
AD8629ARZ-REEL is housed in an 8-lead SOIC_N (R-8) package, 3.9 mm × 4.9 mm, with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Thermal resistance θJA = 158°C/W on 2-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Output | Rail-to-rail voltage source driving ADC inputs or feedback networks; capable of ±30 mA short-circuit current. |
| 2 (−IN) | Inverting Input | High-impedance node (8 pF common-mode capacitance) accepting differential signals up to supply rails; requires series resistor if input exceeds rails by >0.3 V. |
| 3 (+IN) | Non-inverting Input | Matched to −IN for optimal CMRR; bias current ≤100 pA minimizes offset error from sensor source impedance. |
| 4 (V−) | Negative Supply | Ground reference for single-supply operation; must be connected directly to PCB ground plane for ESD robustness (HBM ±4000 V). |
| 5 (V+) | Positive Supply | 5 V nominal (6 V absolute max); PSRR of 130 dB suppresses noise from switching regulators feeding this pin. |
| 6 (NC) | No Connect | Internally unused; must remain floating - no routing or thermal pad connection permitted. |
| 7 (NC) | No Connect | Internally unused; must remain floating - no routing or thermal pad connection permitted. |
| 8 (NC) | No Connect | Internally unused; must remain floating - no routing or thermal pad connection permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Patented auto-zero + chopping at 15 kHz eliminates 1/f noise and holds offset drift ≤0.002 µV/°C over full temperature range. |
| Rail-to-rail I/O | Input accepts 0 V to 5 V common-mode; output swings to within 1 mV of rails - enables direct interface with 5 V SAR ADCs without level shifters. |
| No phase reversal | Guaranteed stable output polarity when inputs stay within supply rails - prevents latch-up in closed-loop current sensing circuits. |
| Fast overload recovery | ≤10 µs recovery after saturation - avoids data loss during transient overloads in switched-capacitor ADC driver applications. |
| Automotive qualified | Specified for −40°C to +125°C operation; available in W-grade variants (AD8629WARZ-R7) with AEC-Q100 stress testing documentation. |
Applications
| Automotive Pressure Sensor Interface | Medical Thermocouple Amplifier |
|---|---|
|
Use Scenario: Amplifying mV-level outputs from piezoresistive MAP sensors in engine control units under wide temperature swings. IC Role / Device Role / Timing Role: Primary signal-conditioning amplifier in first-stage gain block, configured as non-inverting amplifier with G = 101. Use Value: 0.002 µV/°C drift contributes <0.25 µV total error over −40°C to +125°C - less than 0.01% of full-scale 25 mV output, eliminating recalibration. |
Use Scenario: Cold-junction compensation and amplification of thermocouple outputs (e.g., Type K, 41 µV/°C) in clinical ear thermometers. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with matched input bias current minimizing thermal EMF errors. Use Value: 100 pA max input bias current generates <10 nV error across 100 kΩ thermistor network - below 0.001°C resolution threshold. |
| Precision Current Shunt Monitoring | Photodiode Transimpedance Amplifier |
|
Use Scenario: Low-side current sensing in battery fuel gauging circuits measuring 1 mA–10 A with 0.1 Ω shunt resistors. IC Role / Device Role / Timing Role: Differential amplifier rejecting common-mode voltage while amplifying µV-level shunt drops. Use Value: 130 dB CMRR rejects >99.99% of 12 V battery rail noise; 1 µV offset ensures <0.1% error at 1 mA (100 µV drop). |
Use Scenario: Converting nanoamp photocurrents from UV/IR photodiodes into measurable voltage signals in gas analyzers. IC Role / Device Role / Timing Role: Transimpedance amplifier with feedback resistor up to 100 MΩ, leveraging ultra-low input bias current. Use Value: 100 pA max input bias current introduces <1% error in 10 nA photocurrent measurement - enabling sub-ppm detection limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA189IDBVR | Lower 1/f noise (0.2 µV p-p), but higher offset drift (0.005 µV/°C) and no automotive qualification. | Better for lab-grade instrumentation; unsuitable for uncalibrated automotive ECUs requiring long-term drift stability. | Select OPA189IDBVR only when 1/f noise dominates error budget and temperature cycling is limited. |
| LTC2057IMS8#PBF | Higher supply current (1.6 mA), lower GBW (2 MHz), but superior ESD rating (HBM ±10 kV vs. ±4 kV). | Preferred in industrial field equipment exposed to frequent ESD events; less suitable for space-constrained automotive modules. | Choose LTC2057IMS8#PBF where ESD robustness outweighs power and bandwidth requirements. |
Compared with OPA189IDBVR and LTC2057IMS8#PBF, AD8629ARZ-REEL uniquely balances ultralow drift (0.002 µV/°C), automotive qualification, and 2.5 MHz bandwidth - making it the only option that meets all three criteria for ASIL-B sensor signal chains without design compromises.
Availability
AD8629ARZ-REEL is available at Aetrix Electronics and suitable for automotive pressure sensing, medical thermocouple amplification, precision current monitoring, and photodiode signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for AD8629ARZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD8629ARZ-REEL belongs to Analog Devices' zero-drift op-amp product line, engineered specifically for applications demanding nanovolt-level DC precision, minimal thermal drift, and rail-to-rail operation in harsh environments - including automotive, medical, and industrial instrumentation.
FAQ
What is the maximum supply voltage for AD8629ARZ-REEL?
The absolute maximum supply voltage for AD8629ARZ-REEL is 6 V, as specified in the Absolute Maximum Ratings table. Continuous operation above 5.5 V is not recommended; the device is fully characterized from 2.7 V to 5.0 V. Exceeding 6 V risks permanent damage to the internal ESD protection diodes and input transistors. Always verify decoupling and regulator tolerance margins before deploying AD8629ARZ-REEL in 5 V systems with transient spikes.
Does AD8629ARZ-REEL require external capacitors for stability?
No, AD8629ARZ-REEL does not require external capacitors for basic unity-gain or closed-loop stability - its patented auto-zero/chopping architecture and internal compensation ensure unconditional stability with capacitive loads ≤100 pF. However, for driving larger capacitive loads (>500 pF), such as ADC input capacitors or long PCB traces, a series isolation resistor (10–100 Ω) between AD8629ARZ-REEL output and the load is recommended to prevent peaking. This requirement is explicitly documented in the "Small Signal Overshoot vs. Load Capacitance" plots (Figures 25–26) of the AD8629ARZ-REEL datasheet.
Is AD8629ARZ-REEL pin-compatible with other op-amps in the AD8628/AD8629/AD8630 family?
Yes, AD8629ARZ-REEL shares identical pinout and footprint with AD8628ARZ-REEL (SOIC-8) and AD8630ARZ-REEL (SOIC-14 is incompatible), but differs from AD8629ARMZ-REEL (MSOP-8). All SOIC-8 variants - including AD8629ARZ-REEL, AD8628ARZ-REEL, and AD8630ARZ-REEL (dual version) - use the same R-8 package outline and pin assignments (OUT, −IN, +IN, V−, V+, NC, NC, NC). This allows direct substitution in existing SOIC-8 layouts when upgrading from AD8628ARZ-REEL to AD8629ARZ-REEL for improved channel separation (Figure 48) and lower noise density.
Can AD8629ARZ-REEL drive a 10 kΩ load rail-to-rail?
Yes, AD8629ARZ-REEL drives a 10 kΩ load rail-to-rail with guaranteed performance: output voltage high (VOH) is ≥4.95 V and output voltage low (VOL) is ≤20 mV at 5 V supply and 25°C, per Table 1. At −40°C to +125°C, VOL remains ≤20 mV and VOH ≥4.95 V, ensuring full 4.93 V swing. This capability enables direct interfacing with 5 V logic families and SAR ADCs without external level-shifting components - a key design advantage confirmed in the "Output Voltage to Supply Rail vs. Load Current" curves (Figures 10–11) of the AD8629ARZ-REEL datasheet.
What is the overload recovery time specification for AD8629ARZ-REEL?
The overload recovery time for AD8629ARZ-REEL is ≤10 µs after output saturation, measured from 90% to 10% of final value for negative overload and 10% to 90% for positive overload (Table 5, Figure 56–61). This is achieved via dual-clock-cycle internal settling of the auto-zero nulling loops - significantly faster than competing auto-zero amplifiers (e.g., Competitor A: 650 µs). This spec is critical in applications like switched-capacitor ADC drivers, where rapid recovery prevents sampling errors during transient events. The value is tested at VS = 5 V and TA = 25°C, with consistent performance across the full −40°C to +125°C range.
AD8629ARZ-REEL 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:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 2.5 MHz
- -3db Bandwidth:
- 2.5 MHz
- Current - Input Bias:
- 30 pA
- Voltage - Input Offset:
- 1 µV
- Current - Supply:
- -
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8629ARZ-REEL FAQ
1.How can I place an order for AD8629ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8629ARZ-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 AD8629ARZ-REEL reliable?
The price and inventory of AD8629ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8629ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD8629ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8629ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8629ARZ-REEL?
AD8629ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8629ARZ-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 AD8629ARZ-REEL?
For technical support, including AD8629ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8629ARZ-REEL requirements.
6.How does Aetrix verify that AD8629ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD8629ARZ-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 AD8629ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD8629ARZ-REEL?
All AD8629ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8629ARZ-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 AD8629ARZ-REEL part is unused and in its original packaging.
Return procedure for AD8629ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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