AD8628ARZ - Zero-Drift Op Amp, Rail-to-Rail | Analog Devices
N.º de pieza: AD8628ARZ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.35 | $2,35 |
| 10 | $2.11 | $21,10 |
| 100 | $1.87 | $187,00 |
| 500 | $1.68 | $840,00 |
| 1.000 | $1.49 | $1.490,00 |
AD8628ARZ Descripción general
A zero-drift amplifier is a type of operational amplifier that uses auto-zeroing or chopping techniques to continuously correct offset voltage and drift, achieving near-zero offset and drift over temperature and time. This category sits within the broader hierarchy of operational amplifiers, which are fundamental building blocks in analog signal processing, and ultimately within linear integrated circuits. The AD8628ARZ belongs to the AD8628/AD8629/AD8630 family of wide bandwidth auto-zero amplifiers, which are designed for applications requiring high DC precision.
Key features include rail-to-rail input and output swing, which maximizes dynamic range in low-voltage applications, and a low noise density of 19.4 nV/√Hz at 1 kHz, as shown in the datasheet comparison. The auto-zero architecture eliminates 1/f noise, providing a flat noise spectrum down to DC. The device also offers a wide bandwidth of 2.5 MHz and a slew rate of 1 V/µs, balancing speed with precision.
Technically, the AD8628 uses a chopper-stabilized input stage that samples and nulls the input offset voltage at a high frequency, resulting in exceptional DC accuracy. The output stage is rail-to-rail, allowing the output to swing within millivolts of the supply rails. The device is fully specified for 5 V single-supply operation, but can also operate from dual supplies up to ±2.5 V. The SOIC-8 package is industry-standard, enabling drop-in replacement in many designs.
Typical applications include precision instrumentation, thermocouple and RTD signal conditioning, medical instrumentation, and battery-powered devices where low power and high accuracy are critical. The AD8628ARZ is also used in high-resolution ADC driver circuits, as referenced in Analog Devices application notes such as AN-1525, which uses the AD8628 with the AD5541/AD5542 DAC.
When designing with this amplifier, pay attention to the input common-mode range, which includes both rails, and ensure proper decoupling of the power supply pins with 0.1 µF ceramic capacitors placed close to the device. The auto-zero clock can generate high-frequency noise, so filtering at the output may be necessary in sensitive applications.
Alternativas directas para AD8628ARZ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con AD8628ARZ (mismo factor de forma y huella) — difiere en Package, Amplifier Type, Slew Rate, Gain Bandwidth Product, Input Bias Current.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
AD8629ARZ
✅ Sustitución directa✓ En stock
$1.55 / unidad
Ver hoja de datos →AD8630ARZ
✅ Sustitución directa✓ En stock
$2.7 / unidad
Ver hoja de datos →ADA4522-1ARZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$1.42 / unidad
Ver hoja de datos →AD8538ARZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$0.52 / unidad
Ver hoja de datos →AD8539ARZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$0.82 / unidad
Ver hoja de datos →OPA2188AIDR
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MCP6V11-E/SN
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
AD8628ARZ Valores máximos y características eléctricas
| Amplifier Type | Zero-Drift |
| Number of Circuits | 1 |
| Tipo de salida | Rail-to-Rail |
| Slew Rate | 1 V/µs |
| Gain Bandwidth Product | 2.5 MHz |
| Current - Input Bias | 100 pA (max) |
| Voltage - Input Offset | 1 µV |
| Current - Supply | 1 mA |
| Current - Output / Channel | 30 mA |
| Voltage - Supply Span (Min) | 2.7 V |
| Voltage - Supply Span (Max) | 5 V |
| Temperatura de funcionamiento | -40°C to +125°C |
| Encapsulado / Carcasa | 8-SOIC |
| Tipo de montaje | Surface Mount |
| Supplier Device Package | 8-SOIC |
| Estado RoHS | Compliant |
Configuración de pines de AD8628ARZ
| Pin 1 | OUT — Output |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NC — No connect |
| Pin 6 | NC — No connect |
| Pin 7 | V+ — Positive supply |
| Pin 8 | NC — No connect |
Aplicaciones típicas
AD8628ARZ es adecuado para 6 aplicacións: Precision Instrumentation, Sensor Signal Conditioning, Medical Instrumentation, Battery-Powered Devices, ADC Driver Circuits, Industrial Process Control.
Precision Instrumentation
The AD8628ARZ's ultralow offset voltage of 1 µV and drift of 0.002 µV/°C make it ideal for precision instrumentation amplifiers. Its rail-to-rail input/output allows maximum dynamic range in low-voltage systems. The high CMRR of 130 dB rejects common-mode noise, ensuring accurate measurements in industrial and laboratory equipment. The device's low bias current of 100 pA minimizes loading on high-impedance sensors, preserving signal integrity. With a bandwidth of 2.5 MHz, it can handle a wide range of signal frequencies while maintaining precision.
Recomendado
Sensor Signal Conditioning
The AD8628ARZ is well-suited for conditioning signals from thermocouples, RTDs, and strain gauges. Its low offset and drift ensure accurate conversion of small sensor voltages, while the rail-to-rail output allows direct interface to ADCs. The device's low noise of 19.4 nV/√Hz at 1 kHz preserves signal fidelity. Operating from a 5 V supply, it can be used in battery-powered sensor nodes. The auto-zero architecture eliminates 1/f noise, making it ideal for DC-coupled measurements. According to the AD8628 datasheet, the device is designed for precision sensor applications.
Recomendado
Medical Instrumentation
In medical devices such as patient monitors and diagnostic equipment, the AD8628ARZ provides the precision and low noise required for accurate biopotential measurements. Its ultralow offset voltage of 1 µV and drift of 0.002 µV/°C ensure stable performance over time and temperature. The device operates from a 5 V supply, compatible with many medical systems. The rail-to-rail output allows direct connection to ADCs without additional circuitry. The low power consumption of 1 mA extends battery life in portable devices. According to the AD8628 datasheet, the device is suitable for medical instrumentation.
Recomendado
Battery-Powered Devices
The AD8628ARZ is ideal for battery-powered devices due to its low supply current of 1 mA and operation from 2.7 V to 5 V. Its rail-to-rail input and output maximize dynamic range in low-voltage systems, while the low offset and drift ensure accurate measurements over time. The device's small SOIC-8 package saves board space. The auto-zero architecture maintains precision even as the battery voltage drops. This makes it suitable for portable instruments, wireless sensors, and handheld medical devices. According to the AD8628 datasheet, the device is designed for low-power applications.
Recomendado
ADC Driver Circuits
The AD8628ARZ is used to drive high-resolution ADCs, as referenced in Analog Devices application note AN-1525, which uses the AD8628 with the AD5541/AD5542 DAC. Its low output impedance and rail-to-rail output ensure full-scale swing into the ADC input. The low noise and high PSRR of 130 dB prevent power supply noise from degrading ADC performance. The device's bandwidth of 2.5 MHz is sufficient for many ADC sampling rates. The auto-zero architecture provides a stable reference for precision conversions. This makes it ideal for data acquisition systems.
Recomendado
Industrial Process Control
In industrial process control, the AD8628ARZ provides accurate signal conditioning for pressure, temperature, and flow sensors. Its high CMRR of 130 dB rejects common-mode noise from long cable runs. The device operates from a 5 V supply, common in industrial systems. The low offset and drift ensure long-term stability, reducing calibration frequency. The rail-to-rail output allows direct interface to PLCs and ADCs. The device's robustness over -40°C to +125°C makes it suitable for harsh environments. According to the AD8628 datasheet, it is designed for precision industrial applications.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AD8628ARZ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | AD8629ARZ | ADA4522-1ARZ | OPA2188AIDR |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Number of Channels | 1 | 2 | 1 | 2 |
| Input Offset Voltage | 1 µV | 1 µV | 2.5 µV | 25 µV |
| Input Offset Drift | 0.002 µV/°C | 0.002 µV/°C | 0.002 µV/°C | 0.02 µV/°C |
| Supply Voltage Range | 2.7 V to 5 V | 2.7 V to 5 V | 2.2 V to 5.5 V | 4.5 V to 36 V |
| Bandwidth | 2.5 MHz | 2.5 MHz | 2.7 MHz | 2 MHz |
| Noise Density at 1 kHz | 19.4 nV/√Hz | 19.4 nV/√Hz | 5.8 nV/√Hz | 8 nV/√Hz |
Diferenciadores clave
- Ultralow offset voltage of 1 µV (frente a OPA2188AIDR)
- Extremely low drift of 0.002 µV/°C (frente a OPA2188AIDR)
- Lower noise density (frente a AD8538ARZ)
Notas de diseño
The AD8628ARZ operates from a 2.7 V to 5 V single supply or dual supplies up to ±2.5 V. Ensure the supply voltage is within the absolute maximum ratings. Use 0.1 µF ceramic capacitors close to the V+ and V- pins for decoupling. For best performance, keep the supply clean and free of ripple, as the device has high PSRR of 130 dB.
Place the AD8628ARZ close to the signal source to minimize trace length and reduce noise pickup. Use a ground plane to provide a low-impedance return path. Keep the input traces short and shielded if necessary. The SOIC-8 package has a thermal pad that should be connected to the ground plane for improved thermal performance, though the device dissipates low power.
The auto-zero clock can generate high-frequency noise at the output. In sensitive applications, add a low-pass filter at the output to remove this noise. Also, ensure the input common-mode voltage stays within the specified range, which includes both rails. Avoid exceeding the maximum supply voltage of 5 V, as this can damage the device.
Información de cumplimiento
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
