AD8629ARZ-REEL7 - Dual Zero-Drift Op Amp | Analog Devices
Référence : AD8629ARZ-REEL7 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 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 |
AD8629ARZ-REEL7 Présentation
Zero-drift amplifiers, also known as auto-zero or chopper-stabilized amplifiers, are a class of operational amplifiers that continuously correct their input offset voltage and drift, achieving near-zero offset and drift over temperature and time. They are essential in precision measurement systems where accuracy is paramount, such as in sensor signal conditioning, medical instrumentation, and precision current sensing. The AD8629ARZ-REEL7 fits into the hierarchy of operational amplifiers, specifically precision amplifiers, and is a key component in analog signal processing chains.
Key features include a maximum offset voltage of 1 µV, a temperature drift of 0.005 µV/°C, and a bias current of 30 pA. The amplifier provides a gain bandwidth product of 2.5 MHz and a slew rate of 1 V/µs, with a low noise density of 22 nV/√Hz. It also features a high open-loop gain of 130 dB and a power supply rejection ratio of 130 dB, ensuring stable performance in noisy environments. The rail-to-rail input and output capability allows maximum dynamic range in low-voltage applications.
Technically, the AD8629 uses a proprietary auto-zero topology that reduces digital switching noise, a common issue in chopper-stabilized amplifiers. This results in a clean output with minimal ripple, making it suitable for high-resolution ADC drivers and precision filters. The device is fully specified over the industrial temperature range of -40°C to +125°C, ensuring reliable operation in harsh environments.
Typical applications include precision instrumentation, thermocouple and RTD signal conditioning, load cell amplifiers, and battery-powered portable devices where low power consumption and high accuracy are critical. The dual-channel configuration allows for compact designs, reducing board space and component count.
When designing with the AD8629ARZ-REEL7, ensure proper decoupling with 0.1 µF capacitors close to the supply pins to maintain stability. The rail-to-rail input stage requires careful attention to common-mode voltage limits to avoid phase reversal. For best performance, use a solid ground plane and minimize parasitic capacitance on the inputs.
Alternatives de remplacement direct pour AD8629ARZ-REEL7 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec AD8629ARZ-REEL7 (même facteur de forme et même empreinte) — différant par Package, Amplifier Type, RoHS Status, Number of Channels, Operating Temperature Range.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AD8629ARZ
✅ Remplacement direct✓ En stock
$1.55 / unité
Voir la fiche technique →AD8629WARZ-R7
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
AD8629TRZ-EP-R7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
OPA2335AIDR
✅ Remplacement direct✓ En stock
$3.81 / unité
Voir la fiche technique →ADA4522-2ARZ
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$3.9 / unité
Voir la fiche technique →AD8629ARZ-REEL7 Valeurs maximales et caractéristiques électriques
| 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 |
| Densité de bruit | 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 |
| Plage de température de fonctionnement | -40°C to +125°C |
| Boîtier | 8-SOIC |
| Type de montage | Surface Mount |
| Niveau MSL | 1 (Unlimited) |
| Statut RoHS | Compliant |
Configuration des broches de AD8629ARZ-REEL7
| Broche 1 | OUT A — Output of amplifier A |
| Broche 2 | -IN A — Inverting input of amplifier A |
| Broche 3 | +IN A — Non-inverting input of amplifier A |
| Broche 4 | V- — Negative supply voltage |
| Broche 5 | +IN B — Non-inverting input of amplifier B |
| Broche 6 | -IN B — Inverting input of amplifier B |
| Broche 7 | OUT B — Output of amplifier B |
| Broche 8 | V+ — Positive supply voltage |
Applications typiques
AD8629ARZ-REEL7 convient pour 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AD8629ARZ-REEL7 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- Ultralow offset voltage and drift (vs OPA2335AIDR)
- Lower bias current (vs OPA2335AIDR)
- Same-brand family compatibility (vs ADA4522-2ARZ)
Notes de conception
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.
Informations de conformité
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified; use AD8629WARZ-R7 for automotive.
