AD8629ARZ-REEL7 - Dual Zero-Drift Op Amp | Analog Devices
MPN: AD8629ARZ-REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.42 | $2.42 |
| 10 | $2.13 | $21.30 |
| 100 | $1.85 | $185.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.48 | $1,480.00 |
Drop-in alternatives for AD8629ARZ-REEL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD8629ARZ
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View Datasheet →AD8629WARZ-R7
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
AD8629TRZ-EP-R7
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OPA2335AIDR
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ADA4522-2ARZ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
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View Datasheet →AD8629ARZ-REEL7 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Gain Bandwidth Product | 2.5 MHz |
| Slew Rate | 1 V/µs |
| Maximum Offset Voltage | 1 µV |
| Offset Voltage Drift | 0.005 µV/°C |
| Bias Current | 30 pA |
| Noise Density | 22 nV/√Hz |
| Open-Loop Gain | 130 dB |
| Power Supply Rejection Ratio | 130 dB |
| Supply Voltage (Single) | 2.7 V to 5 V |
| Supply Voltage (Dual) | ±1.35 V to ±2.5 V |
| Rail-to-Rail Input/Output | Yes |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-SOIC |
| Mounting Type | Surface Mount |
| MSL Level | 1 (Unlimited) |
| RoHS Status | Compliant |
AD8629ARZ-REEL7 Pin Configuration
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | -IN A — Inverting input of amplifier A |
| Pin 3 | +IN A — Non-inverting input of amplifier A |
| Pin 4 | V- — Negative supply voltage |
| Pin 5 | +IN B — Non-inverting input of amplifier B |
| Pin 6 | -IN B — Inverting input of amplifier B |
| Pin 7 | OUT B — Output of amplifier B |
| Pin 8 | V+ — Positive supply voltage |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD8629ARZ-REEL7 is suitable for 6 applications: Precision Instrumentation, Medical Instrumentation, Sensor Signal Conditioning, Battery-Powered Portable Devices, ADC Driver, Load Cell Amplifier.
Precision Instrumentation
The AD8629ARZ-REEL7's ultralow offset voltage (1 µV) and drift (0.005 µV/°C) make it ideal for precision instrumentation amplifiers. In a typical bridge sensor interface, the dual op amp can be configured as a two-op-amp instrumentation amplifier, providing high common-mode rejection and accurate measurement of small differential signals. The rail-to-rail output allows direct connection to ADCs without additional level shifting, simplifying the signal chain. The low bias current (30 pA) minimizes errors when interfacing with high-impedance sensors, ensuring measurement accuracy over the industrial temperature range.
Recommended
Medical Instrumentation
In medical devices such as patient monitors and diagnostic equipment, the AD8629ARZ-REEL7 provides the precision and low noise required for biosignal amplification. Its zero-drift architecture ensures stable DC performance over time and temperature, critical for ECG and EEG signal conditioning. The low supply voltage operation (2.7 V to 5 V) is compatible with battery-powered portable medical devices. The dual-channel configuration allows for compact designs, reducing board space in space-constrained medical instruments. The high open-loop gain (130 dB) ensures linearity in precision measurement paths.
Recommended
Sensor Signal Conditioning
The AD8629ARZ-REEL7 excels in sensor signal conditioning for thermocouples, RTDs, and load cells. Its ultralow offset and drift eliminate the need for frequent calibration, reducing maintenance in industrial systems. The low bias current (30 pA) is ideal for high-impedance sensors, preventing loading errors. The rail-to-rail input and output allow the amplifier to handle signals near the supply rails, maximizing dynamic range. In a typical RTD interface, the dual op amp can be used for excitation and amplification, providing a complete solution in a single package.
Recommended
Battery-Powered Portable Devices
For battery-powered portable devices, the AD8629ARZ-REEL7 offers low power consumption and operation down to 2.7 V, extending battery life. The rail-to-rail output maximizes signal swing in low-voltage systems, improving dynamic range. The dual-channel configuration reduces component count and board space, ideal for compact handheld instruments. The zero-drift performance ensures accuracy over the battery discharge cycle, maintaining measurement integrity. Applications include portable gas detectors, handheld multimeters, and wearable health monitors.
Recommended
ADC Driver
The AD8629ARZ-REEL7 is well-suited as an ADC driver for high-resolution converters. Its low noise (22 nV/√Hz) and high open-loop gain (130 dB) ensure minimal distortion and accurate signal transfer. The rail-to-rail output can drive the full-scale input range of ADCs, maximizing resolution. The zero-drift architecture eliminates offset errors that could otherwise degrade ADC performance. In a typical SAR ADC interface, the dual op amp can be used for anti-aliasing filtering and buffering, providing a clean signal to the converter.
Recommended
Load Cell Amplifier
In load cell and weigh scale applications, the AD8629ARZ-REEL7 provides the precision and stability required for accurate weight measurement. The ultralow offset voltage (1 µV) and drift (0.005 µV/°C) minimize zero drift, ensuring consistent readings over temperature. The low bias current (30 pA) reduces errors from the bridge's high output impedance. The dual op amp can be configured as a differential amplifier to reject common-mode noise, improving measurement accuracy. The rail-to-rail output allows direct interface to ADCs, simplifying the design.
Recommended
Recommended Products Summary
Engineering reference data for AD8629ARZ-REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8629ARZ | AD8629WARZ-R7 | OPA2335AIDR | ADA4522-2ARZ |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Number of Channels | 2 | 2 | 2 | 2 | 2 |
| Gain Bandwidth Product | 2.5 MHz | 2.5 MHz | 2.5 MHz | 2 MHz | 2.7 MHz |
| Maximum Offset Voltage | 1 µV | 1 µV | 1 µV | 1 µV | 2.5 µV |
| Offset Voltage Drift | 0.005 µV/°C | 0.005 µV/°C | 0.005 µV/°C | 0.02 µV/°C | 0.002 µV/°C |
| Bias Current | 30 pA | 30 pA | 30 pA | 70 pA | 50 pA |
| Noise Density | 22 nV/√Hz | 22 nV/√Hz | 22 nV/√Hz | 12 nV/√Hz | 5.8 nV/√Hz |
Key Differentiators
- Ultralow offset voltage and drift (vs OPA2335AIDR)
- Lower bias current (vs OPA2335AIDR)
- Same-brand family compatibility (vs ADA4522-2ARZ)
Design Notes
The AD8629ARZ-REEL7 operates from 2.7 V to 5 V single supply or ±1.35 V to ±2.5 V dual supply. Ensure the supply voltage is within the specified range to avoid damage. Use 0.1 µF ceramic capacitors close to the V+ and V- pins for decoupling, and a 10 µF bulk capacitor for low-frequency stability. The low quiescent current makes it suitable for battery-powered designs, but verify the supply current in the datasheet for your specific configuration.
For optimal performance, place the AD8629ARZ-REEL7 on a solid ground plane and minimize parasitic capacitance on the input pins. Keep traces short and direct, especially for high-impedance inputs. Use guard rings around the input pins to reduce leakage currents, which is critical for achieving the low bias current (30 pA) specification. Ensure proper thermal relief for the SOIC package to avoid overheating in high-temperature environments.
Avoid exceeding the common-mode input voltage range, which is rail-to-rail, but ensure inputs do not go beyond the supply rails to prevent phase reversal. The auto-zero architecture may introduce a small clock noise at the switching frequency; use a low-pass filter if this is a concern. Do not leave unused inputs floating; tie them to a suitable voltage to prevent oscillation. Always refer to the datasheet's typical application circuits for guidance.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified; use AD8629WARZ-R7 for automotive.
