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 | $1.45 | $1,450.00 |
Drop-in alternatives for AD8629ARZ-REEL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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OPA2335AIDR
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View Datasheet →AD8629ARZ-REEL7 Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Supply Voltage - Single | 2.7 V to 5 V |
| Supply Voltage - Dual | ±1.35 V to ±2.5 V |
| Gain Bandwidth Product | 2.5 MHz |
| Slew Rate | 1 V/µs |
| Input Offset Voltage | 1 µV (max) |
| Offset Drift | 0.005 µV/°C |
| Input Bias Current | 30 pA |
| Voltage Noise Density | 22 nV/√Hz |
| Open-Loop Gain | 130 dB |
| Power Supply Rejection Ratio | 130 dB |
| Common-Mode Rejection Ratio | 130 dB |
| Output Type | Rail-to-Rail |
| 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 or ground |
| 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 |
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 Sensor Signal Conditioning, Medical Instrumentation, Battery-Powered Portable Devices, Industrial Process Control, Test and Measurement Equipment, Automotive Electronics.
Precision Sensor Signal Conditioning
The AD8629ARZ-REEL7's ultralow offset (1 µV) and drift (0.005 µV/°C) make it ideal for amplifying small sensor signals from thermocouples, RTDs, and strain gauges. Its rail-to-rail input and output allow direct interfacing with ADCs, and the low bias current (30 pA) minimizes loading on high-impedance sensors. The dual channel enables differential or multi-sensor configurations, reducing component count and board space. With a supply range down to 2.7 V, it supports battery-powered portable instruments. The high CMRR (130 dB) rejects common-mode noise, ensuring accurate measurements in industrial environments.
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 ultralow offset and drift ensure stable readings over time, critical for long-term monitoring. The low supply voltage (2.7 V) is compatible with battery-operated devices, and the rail-to-rail output maximizes dynamic range for ECG and EEG signals. The dual-channel configuration allows simultaneous processing of multiple signals, such as ECG and respiration. The device's small 8-SOIC package is suitable for compact, portable designs. Compliance with medical standards is supported by its wide temperature range and reliability.
Recommended
Battery-Powered Portable Devices
The AD8629ARZ-REEL7 is optimized for battery-powered applications due to its low supply voltage (2.7 V to 5 V) and low quiescent current. Its rail-to-rail input and output allow full use of the supply range, extending battery life. The zero-drift architecture ensures accuracy over the battery's discharge cycle, maintaining performance as voltage drops. Typical uses include portable gas detectors, handheld multimeters, and wearable health monitors. The dual-channel design reduces power consumption compared to using two single amplifiers. The device's small footprint and wide temperature range make it suitable for rugged portable equipment.
Recommended
Industrial Process Control
In industrial settings, the AD8629ARZ-REEL7 provides accurate signal conditioning for pressure, temperature, and flow sensors. Its high CMRR (130 dB) and PSRR (130 dB) reject noise from motors and power lines, ensuring reliable operation in harsh environments. The wide temperature range (-40°C to +125°C) allows use in extreme conditions. The low offset and drift minimize calibration requirements, reducing maintenance costs. The dual-channel configuration enables implementation of bridge amplifiers or multiple sensor inputs. The device's robustness and precision make it suitable for PLCs, transmitters, and process controllers.
Recommended
Test and Measurement Equipment
The AD8629ARZ-REEL7 is used in precision test equipment such as digital multimeters, data loggers, and bench instruments. Its ultralow offset and drift ensure accurate DC measurements, while the 2.5 MHz bandwidth supports AC signals up to moderate frequencies. The rail-to-rail output allows direct drive of ADC inputs without additional circuitry. The low bias current (30 pA) is essential for high-impedance measurements. The dual-channel configuration is useful for differential measurements or simultaneous sampling of two signals. The device's stability over temperature and time makes it ideal for calibration-grade instruments.
Recommended
Automotive Electronics
The AD8629ARZ-REEL7 is suitable for automotive applications such as battery monitoring, motor control, and sensor interfaces. Its wide temperature range (-40°C to +125°C) meets automotive requirements, and the low offset and drift ensure accurate current sensing over the vehicle's operating range. The rail-to-rail I/O allows interfacing with 3.3 V and 5 V microcontrollers. The dual-channel configuration is useful for monitoring multiple battery cells or phase currents. The device's low power consumption is beneficial for always-on systems. For AEC-Q100 qualified versions, consider the AD8629WARZ-R7.
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 | AD8628ARZ | 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 | 1 | 2 | 2 |
| Supply Voltage Range | 2.7V to 5V | 2.7V to 5V | 2.7V to 5V | 2.7V to 5.5V | 4.5V to 55V |
| Input Offset Voltage (max) | 1 µV | 1 µV | 1 µV | 5 µV | 2.5 µV |
| Offset Drift | 0.005 µV/°C | 0.005 µV/°C | 0.005 µV/°C | 0.05 µV/°C | 0.002 µV/°C |
| Gain Bandwidth Product | 2.5 MHz | 2.5 MHz | 2.5 MHz | 3.5 MHz | 2.7 MHz |
| Voltage Noise Density | 22 nV/√Hz | 22 nV/√Hz | 22 nV/√Hz | 12 nV/√Hz | 5.8 nV/√Hz |
Key Differentiators
- Ultralow offset voltage of 1 µV (vs OPA2335AIDR)
- Extremely low offset drift of 0.005 µV/°C (vs OPA2335AIDR)
- Lower supply voltage operation (2.7V) (vs ADA4522-2ARZ)
Design Notes
The AD8629ARZ-REEL7 operates from 2.7V to 5V single supply. Ensure the supply is well-regulated and decoupled with a 0.1µF ceramic capacitor close to the V+ pin and a 10µF bulk capacitor if the supply is shared with other components. For dual supply operation, use ±1.35V to ±2.5V and decouple both rails. The low quiescent current (typical 1.2mA per amplifier) makes it suitable for battery-powered designs, but verify the supply voltage does not exceed the absolute maximum rating of 6V.
For optimal performance, place the AD8629ARZ-REEL7 on a PCB with a solid ground plane. Keep input traces short and shielded to minimize noise pickup. Use guard rings around the input pins to reduce leakage currents, especially in high-impedance applications. The 8-SOIC package has a thermal pad (exposed pad) that should be soldered to a copper area for heat dissipation, though power dissipation is typically low. Follow the layout guidelines in the datasheet for best results.
Avoid exceeding the common-mode input voltage range, which is from V- to V+ (rail-to-rail). Input voltages beyond these rails can cause phase reversal and output saturation. Also, ensure the output load does not exceed the specified output current capability (typically ±30mA). When driving capacitive loads, add a series resistor (e.g., 50Ω) to maintain stability. The zero-drift architecture may produce a small clock feedthrough at the switching frequency; filter it if necessary.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified for standard version; use AD8629WARZ-R7 for automotive.
