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Analog Devices Inc. AD8628ARZ-REEL
- Part No.:
- AD8628ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8628ARZ-REEL.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,308
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Product details
Overview
AD8628ARZ-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 0.5 µV p-p (0.1 Hz–10 Hz) noise - enabling high-accuracy signal conditioning in automotive pressure sensors and medical thermocouple interfaces.
For engineers reviewing the AD8628ARZ-REEL datasheet, AD8628ARZ-REEL pinout, AD8628ARZ-REEL application, or AD8628ARZ-REEL equivalent, key selection considerations include its 8-lead SOIC_N package, −40°C to +125°C operation, single-supply 2.7 V–5 V compatibility, ultralow drift stability, and absence of external capacitor requirements for auto-zero functionality.
Technical Context
The AD8628ARZ-REEL employs a patented ping-pong auto-zeroing and chopping architecture operating at 15 kHz, eliminating 1/f noise while minimizing switching artifacts. Its input stage uses ESD-protected JFET inputs with 100 pA max bias current and 8.0 pF common-mode capacitance.
This architecture enables true 16-bit accuracy in systems with 5 kHz–10 kHz signal bandwidths, supports rail-to-rail output swing within 5 mV of rails (at 10 kΩ load), and achieves overload recovery in under 10 µs - critical for interfacing with switched-capacitor ADCs and precision DAC output stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 1 µV typical - ensures ≤38 µV error at 16-bit DAC LSB level (2.5 V reference), eliminating need for system-level trimming. |
| Offset Drift | 0.002 µV/°C - guarantees <0.25 µV total drift over −40°C to +125°C, preserving calibration integrity in automotive under-hood environments. |
| CMRR / PSRR | 130 dB - rejects >99.999% of supply and common-mode interference, essential for low-level sensor signals in noisy industrial or vehicle power domains. |
| Gain Bandwidth | 2.5 MHz - supports stable closed-loop gain ≥100 up to 25 kHz, suitable for anti-alias filtering before 100 kSPS ADCs. |
| Noise (0.1–10 Hz) | 0.5 µV p-p - enables sub-µV resolution in dc measurements lasting >200 ms, e.g., thermopile or strain gage outputs. |
| Supply Current | 1.0 mA - allows battery-powered portable instrumentation with multi-year runtime when paired with low-duty-cycle sampling. |
| Output Swing | Rail-to-rail, ±5 mV - maximizes dynamic range from 0 V to 5 V supplies, reducing need for level-shifting circuitry in unipolar data acquisition systems. |
Pinout & Package
AD8628ARZ-REEL is housed in an 8-lead narrow SOIC (SOIC_N, package code R-8), 3.9 mm × 4.9 mm body, 1.27 mm pitch, with exposed pad not present. Thermal resistance θJA = 158°C/W on standard two-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null (not used) | Unconnected in standard configuration; no external trim required due to internal auto-zeroing. |
| 2 | Inverting Input (−) | High-impedance node (8 pF CIN) accepting rail-to-rail common-mode voltages from GND to VS. |
| 3 | Noninverting Input (+) | Matches Pin 2 characteristics; differential input voltage limited to ±5 V or supply, whichever is less. |
| 4 | V− (GND) | Ground reference for single-supply operation; must be low-impedance to maintain PSRR and noise performance. |
| 5 | Output | Capable of sourcing/sinking ±30 mA; swings within 5 mV of rails into 10 kΩ load, supporting direct interface to SAR ADC inputs. |
| 6 | V+ (Supply) | Accepts 2.7 V–5.5 V; PSRR of 130 dB minimizes supply ripple coupling into output signal path. |
| 7 | NC | No internal connection; electrically isolated to prevent parasitic coupling or latch-up risk. |
| 8 | Offset Null (not used) | Left open; internal trimming eliminates need for external potentiometer or resistor network. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift topology | Ping-pong auto-zero + chopping at 15 kHz eliminates 1/f noise and holds offset stable across temperature and time without external components. |
| Rail-to-rail I/O | Input common-mode range extends 300 mV beyond rails; output drives within 5 mV of V− and V+, maximizing usable signal range in 5 V systems. |
| Low-noise precision | 0.5 µV p-p (0.1–10 Hz) and 22 nV/√Hz @ 1 kHz enable 16-bit accuracy in 5–10 kHz bandwidth applications without post-processing filtering. |
| Fast overload recovery | 6 µs (positive) / 9 µs (negative) recovery after saturation - 100× faster than legacy auto-zero amplifiers, preventing settling errors in fast-sampling sensor systems. |
| Automotive qualified | Specified for −40°C to +125°C operation with AEC-Q200-aligned reliability; available in W-grade variants (not this part), but AD8628ARZ-REEL meets same temp range and robustness. |
Applications
| Automotive Pressure Sensors | Medical Thermocouple Amplifiers |
|---|---|
Use Scenario: Signal conditioning for piezoresistive pressure transducers in engine manifold or brake line monitoring, operating continuously at 125°C ambient. IC Role / Device Role / Timing Role: Primary front-end amplifier providing gain, offset correction, and rail-to-rail buffering before 16-bit sigma-delta ADC. Use Value: 0.002 µV/°C drift prevents >0.25 µV calibration drift over full temperature range, maintaining ±0.1% FS accuracy without recalibration. | Use Scenario: Cold-junction compensation and amplification of µV-level thermocouple outputs (Type K/J) in handheld clinical thermometers. IC Role / Device Role / Timing Role: Precision dc-coupled preamplifier with gain ≥1000, rejecting thermal EMF errors from PCB copper traces. Use Value: 0.5 µV p-p (0.1–10 Hz) noise enables resolution of <0.01°C temperature steps without averaging, meeting FDA Class II device requirements. |
| Precision Current Shunt Sensing | High-Accuracy DAC Output Buffer |
Use Scenario: Low-side current measurement of 1 mA–10 A loads in battery fuel gauging and motor control feedback loops. IC Role / Device Role / Timing Role: Difference amplifier in bidirectional shunt configuration, rejecting common-mode voltage up to 5 V while resolving 100 µV drops. Use Value: 130 dB CMRR suppresses >99.999% of shunt common-mode noise; 100 pA input bias avoids >0.1% error on 100 Ω shunts at 1 mA. | Use Scenario: Output buffer for AD5541 16-bit DAC in industrial process controllers requiring untrimmed 0–5 V analog outputs. IC Role / Device Role / Timing Role: Unity-gain stable output driver with rail-to-rail swing, compensating DAC output impedance (~6 kΩ). Use Value: 1 µV offset contributes <3% of DAC LSB (38 µV); combined DAC+AD8628ARZ-REEL settling time is 1.4 µs, preserving 1 MSPS throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDR | 1.8 µV offset, 0.02 µV/°C drift, 350 kHz GBW, 17 nV/√Hz noise - higher drift and lower bandwidth than AD8628ARZ-REEL. | Better suited for low-power (<200 µA), low-bandwidth (<100 kHz) portable instrumentation where ultra-low drift is secondary. | Select OPA333AIDR only if supply current <200 µA is mandatory and 16-bit accuracy over temperature is not required. |
| LTC2050CS5#TRMPBF | 0.5 µV offset, 0.015 µV/°C drift, 3 MHz GBW, 0.6 µV p-p noise - slightly better offset but higher 0.1–10 Hz noise and SOT-23-5 packaging only. | Preferred for space-constrained designs needing lowest possible offset, but lacks SOIC option and has longer overload recovery (>50 µs). | Choose LTC2050CS5#TRMPBF when board area is critical and SOIC footprint is unavailable; verify layout accommodates SOT-23 thermal limits (θJA = 230°C/W). |
Compared with OPA333AIDR and LTC2050CS5#TRMPBF, AD8628ARZ-REEL uniquely balances ultralow drift (0.002 µV/°C), low 0.1–10 Hz noise (0.5 µV p-p), SOIC-8 manufacturability, and 2.5 MHz bandwidth - making it optimal for automotive and medical systems demanding long-term calibration stability without layout compromise.
Availability
AD8628ARZ-REEL is available at Aetrix Electronics and suitable for automotive pressure sensing, medical thermocouple amplification, precision current shunt monitoring, and high-resolution DAC buffering requiring stable component supply across extended temperature ranges.
Supply support for AD8628ARZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD8628ARZ-REEL belongs to Analog Devices' zero-drift precision op amp product line, engineered specifically for applications where dc accuracy, thermal stability, and noise performance cannot be compromised - including automotive sensors, medical diagnostics, and test equipment.
FAQ
What is the maximum supply voltage for AD8628ARZ-REEL?
The absolute maximum supply voltage for AD8628ARZ-REEL is 6 V. Operation is fully specified from 2.7 V to 5.5 V single supply. Exceeding 6 V risks permanent damage per Absolute Maximum Ratings (Table 3). For reliable 5 V system design, AD8628ARZ-REEL maintains full performance at VS = 5.0 V, including 130 dB PSRR and rail-to-rail output swing.
Does AD8628ARZ-REEL require external capacitors for auto-zero stabilization?
No, AD8628ARZ-REEL requires no external capacitors for auto-zero operation. Its integrated ping-pong architecture eliminates 1/f noise and stabilizes offset without external components - a key differentiator from earlier auto-zero amplifiers. This simplifies layout, reduces BOM count, and improves reliability in space-constrained or high-vibration environments where capacitor solder joints may fail.
What is the overload recovery time of AD8628ARZ-REEL, and why does it matter?
AD8628ARZ-REEL recovers from positive input overload in 6 µs and negative overload in 9 µs. This sub-10 µs recovery is critical when driving switched-capacitor ADCs or multiplexed sensor arrays, where transient-induced saturation must settle before next conversion cycle. Slower recovery (e.g., >100 µs in legacy parts) causes measurement errors and dead-time penalties in high-throughput systems.
Can AD8628ARZ-REEL operate from a 2.7 V single supply?
Yes, AD8628ARZ-REEL is fully specified for 2.7 V single-supply operation. At VS = 2.7 V, it maintains rail-to-rail input/output swing (0–2.7 V), 115 dB CMRR, 2 MHz GBW, and 0.5 µV p-p (0.1–10 Hz) noise. This enables compatibility with Li-ion battery-powered devices and low-voltage industrial controllers without performance degradation.
Is AD8628ARZ-REEL pin-compatible with other op amps in the AD8628/AD8629/AD8630 family?
AD8628ARZ-REEL (8-lead SOIC) shares identical pinout with AD8629ARZ-REEL and AD8629ARMZ-REEL in SOIC and MSOP packages respectively, but not with AD8628 variants in TSOT-5 or SOT-23-5. All SOIC-packaged members use the same R-8 footprint and pin assignment (Pins 1,7 NC; Pins 2,3 inputs; Pin 5 output; Pins 4,6 supplies), enabling drop-in replacement where gain, bandwidth, and channel count align.
AD8628ARZ-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:
- 1
- 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:
- 850µA
- 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
AD8628ARZ-REEL FAQ
1.How can I place an order for AD8628ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8628ARZ-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 AD8628ARZ-REEL reliable?
The price and inventory of AD8628ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8628ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD8628ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8628ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8628ARZ-REEL?
AD8628ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8628ARZ-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 AD8628ARZ-REEL?
For technical support, including AD8628ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8628ARZ-REEL requirements.
6.How does Aetrix verify that AD8628ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD8628ARZ-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 AD8628ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD8628ARZ-REEL?
All AD8628ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8628ARZ-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 AD8628ARZ-REEL part is unused and in its original packaging.
Return procedure for AD8628ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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