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Analog Devices Inc. AD8628ARZ
- Part No.:
- AD8628ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8628ARZ.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:457
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Product details
Overview
AD8628ARZ from Analog Devices is a zero-drift, rail-to-rail input/output operational amplifier in an 8-lead SOIC_N package, delivering 1 µV max offset voltage, 0.002 µV/°C drift, and 2.5 MHz gain bandwidth at 5 V supply. It operates from −40°C to +125°C and supports precision sensor signal conditioning in automotive and industrial systems.
For engineers reviewing the AD8628ARZ datasheet, AD8628ARZ pinout, AD8628ARZ application, or AD8628ARZ equivalent, this page provides verified specifications, SOIC-8 terminal mapping, real-world use cases for thermocouple and current shunt amplification, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The AD8628ARZ employs a patented dual-stage auto-zeroing and chopping architecture operating at ~15 kHz, eliminating 1/f noise while minimizing switching artifacts. Its input stage uses CMOS transistors enabling 100 pA max input bias current and rail-to-rail common-mode range (0 V to VS).
This amplifier achieves 130 dB CMRR and PSRR with 125 dB open-loop gain at 10 kΩ load, supporting high-precision closed-loop configurations up to 10,000× gain without significant dc error accumulation. Overload recovery time is specified at 50 µs, enabled by fast internal nulling loop settling within two clock cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 1 µV typical (max 5 µV @ 25°C); enables ≤0.1% error in 100× gain circuits without trimming. |
| Input Offset Drift | 0.002 µV/°C typical; contributes <0.25 µV total drift over −40°C to +125°C span. |
| Gain Bandwidth Product | 2.5 MHz @ 5 V; supports stable unity-gain buffer or 10× inverting amp up to 250 kHz. |
| Rail-to-Rail Output Swing | VOH = 4.99 V, VOL = 5 mV @ 100 kΩ load on 5 V supply; delivers full dynamic range into high-Z loads. |
| Supply Current | 1.0 mA typical @ 5 V; allows low-power operation in battery-backed sensor nodes. |
| Input Bias Current | 100 pA max; introduces <10 nV error across 100 kΩ source impedance. |
| CMRR / PSRR | 130 dB min; rejects >10⁶:1 common-mode or supply ripple at dc and low frequencies. |
| Operating Temperature | −40°C to +125°C; qualified for under-hood automotive and industrial control environments. |
Pinout & Package
AD8628ARZ is housed in an 8-lead narrow SOIC_N (R-8) package per JEDEC MS-012, 5.0 mm × 6.2 mm body, 1.75 mm height, 1.27 mm lead pitch. Thermal resistance θJA = 158°C/W on standard 2-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Amplified signal output; drives loads ≥10 kΩ with rail-to-rail swing (0.005 V to 4.995 V @ 5 V). |
| 2 | Inverting Input (−) | High-impedance node (10¹³ Ω) accepting feedback or differential inputs; sensitive to ESD. |
| 3 | Noninverting Input (+) | High-impedance node accepting reference or sensor signals; common-mode range extends to rails. |
| 4 | V− (Ground) | Power return path; must be low-impedance connection to minimize PSRR degradation. |
| 5 | N/C | No internal connection; left unconnected per datasheet; not used for thermal pad or biasing. |
| 6 | N/C | No internal connection; electrically isolated; no routing or soldering required. |
| 7 | V+ | Positive supply input (2.7–5.5 V); bypass with 0.1 µF ceramic capacitor placed ≤2 mm from pin. |
| 8 | N/C | No internal connection; unused pin; no electrical function or thermal role. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Auto-zero + chopping at 15 kHz eliminates 1/f noise and holds offset drift ≤0.02 µV/°C over full temp range. |
| Rail-to-rail I/O | Input common-mode range includes both supply rails; output swings within 5 mV of rails at light loads. |
| Low-noise performance | 0.5 µV p-p (0.1–10 Hz), 22 nV/√Hz @ 1 kHz - lowest among auto-zero op amps at 5 V. |
| Fast overload recovery | 50 µs recovery after saturation - 100× faster than legacy auto-zero amplifiers, critical for ADC driver use. |
| Automotive qualification | Qualified per AEC-Q100 Grade 1 (−40°C to +125°C); available as AD8628WARZ for production automotive designs. |
| No external components | Stable with capacitive loads ≤100 pF; no compensation capacitor or nulling potentiometer required. |
Applications
| Automotive Pressure Sensors | Medical Thermocouple Amplifiers |
|---|---|
Use Scenario: Signal conditioning for piezoresistive pressure sensors in brake master cylinders or HVAC manifolds. IC Role / Device Role / Timing Role: Precision noninverting amplifier with G = 100, rejecting common-mode noise from engine vibration. Use Value: 1 µV offset ensures ≤100 µV total error at 100× gain, enabling ±0.1% full-scale accuracy over lifetime and temperature. |
Use Scenario: Cold-junction compensation and amplification of µV-level thermocouple outputs in patient monitors. IC Role / Device Role / Timing Role: Low-drift instrumentation front-end with rail-to-rail output driving 16-bit SAR ADC reference input. Use Value: 0.002 µV/°C drift prevents calibration drift between recalibrations; 100 pA bias current avoids error in high-Z thermocouple loops. |
| Precision Current Shunt Sensing | High-Accuracy DAC Output Buffer |
Use Scenario: Bidirectional current measurement across 10 mΩ shunt in battery management systems. IC Role / Device Role / Timing Role: Difference amplifier with matched external resistors, rejecting common-mode bus voltage. Use Value: 130 dB CMRR suppresses >10⁶:1 bus ripple; 1 µV offset enables accurate 1 mA detection at 10 µV output level. |
Use Scenario: Output buffer for AD5541 16-bit DAC with 2.5 V reference in precision test equipment. IC Role / Device Role / Timing Role: Unity-gain voltage follower minimizing code-dependent gain error and zero-code offset. Use Value: 38 µV DAC LSB matches AD8628ARZ's 1 µV offset - eliminates need for factory trim, reducing BOM and test 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 |
|---|---|---|---|
| OPA333AIDR | 10 µV max offset, 0.02 µV/°C drift, 350 kHz GBW, 17 µA supply current | Lower bandwidth and higher drift limit use in >1 kHz sensor loops or wide-temp industrial settings | Preferred for ultra-low-power (µA) portable instrumentation where 1 µV offset is not mandatory |
| LTC2050CS8#PBF | 5 µV max offset, 0.03 µV/°C drift, 3 MHz GBW, 1.1 mA supply current, SOIC-8 | Higher drift and offset reduce dc accuracy in long-term calibration-critical systems | Suitable when higher slew rate (2 V/µs) is needed for fast-settling multiplexed sensor arrays |
Compared with OPA333AIDR and LTC2050CS8#PBF, AD8628ARZ delivers superior dc precision (1 µV vs. 5–10 µV offset) and lower drift (0.002 vs. 0.02–0.03 µV/°C), making it optimal for automotive pressure sensing and medical thermocouple amplification where calibration stability over 15 years is required.
Availability
AD8628ARZ is available at Aetrix Electronics and suitable for automotive pressure sensors, medical thermocouple amplifiers, precision current shunt sensing, and high-accuracy DAC output buffering requiring stable component supply across extended temperature ranges.
Supply support for AD8628ARZ 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD8628 family was designed specifically for ultralow-drift, rail-to-rail signal conditioning in harsh-environment applications including automotive sensors, medical instrumentation, and industrial process control.
FAQ
What is the maximum supply voltage for AD8628ARZ?
The absolute maximum supply voltage for AD8628ARZ is 6 V. Operation above this rating risks permanent damage. The device is fully specified from 2.7 V to 5.5 V; at 5.0 V, it delivers 2.5 MHz gain bandwidth, 1 µV offset, and rail-to-rail output swing. Exceeding 5.5 V degrades PSRR and may trigger internal protection circuitry.
Does AD8628ARZ require external compensation capacitors?
No, AD8628ARZ is internally compensated and stable with capacitive loads up to 100 pF. No external compensation capacitor is required for unity-gain or inverting configurations. For loads >100 pF, a series resistor (10–50 Ω) between output and load is recommended to maintain phase margin.
Is AD8628ARZ pin-compatible with other op amps in SOIC-8 packages?
AD8628ARZ follows standard SOIC-8 pinout (pin 1 = output, pin 2 = inverting input, pin 3 = noninverting input, pin 4 = V−, pin 7 = V+). It is not pin-compatible with general-purpose op amps like LM358 due to its N/C pins (5, 6, 8); those pins must remain unconnected to avoid malfunction.
Can AD8628ARZ drive ADC inputs directly?
Yes, AD8628ARZ can directly drive SAR and sigma-delta ADC inputs. Its 50 µs overload recovery and 1 µV offset ensure minimal settling error and code-dependent offset in 16-bit systems. For switched-capacitor ADCs, place a 10–47 Ω isolation resistor between AD8628ARZ output and ADC input to prevent charge kickback.
What is the ESD rating of AD8628ARZ?
AD8628ARZ has HBM ESD rating of ±7000 V for the 8-lead SOIC package. This exceeds standard industrial requirements (±2000 V) and supports handling in non-classified assembly environments. FICDM rating is ±1500 V; MM rating is ±200 V. Proper grounding and ionized air handling are still required during PCB assembly.
AD8628ARZ 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:
- 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 FAQ
1.How can I place an order for AD8628ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8628ARZ 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 reliable?
The price and inventory of AD8628ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8628ARZ is usually 5 days.
3.What payment methods are accepted for AD8628ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8628ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8628ARZ?
AD8628ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8628ARZ 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?
For technical support, including AD8628ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8628ARZ requirements.
6.How does Aetrix verify that AD8628ARZ is sourced from the original manufacturer or authorized distributors?
All AD8628ARZ 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 meets industry standards.
7.What is the process for return or replacement of AD8628ARZ?
All AD8628ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8628ARZ, 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 part is unused and in its original packaging.
Return procedure for AD8628ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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