AD620ARZ - Low Cost Low Power Instrumentation Amplifier | Analog Devices
N.º de pieza: AD620ARZ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $11.44 | $11,44 |
| 10 | $10.3 | $103,00 |
| 100 | $9.15 | $915,00 |
| 500 | $8 | $4.000,00 |
| 1.000 | $7.2 | $7.200,00 |
AD620ARZ Descripción general
An instrumentation amplifier is a type of differential amplifier that amplifies the difference between two input signals while rejecting common-mode voltages. It is characterized by high input impedance, high common-mode rejection ratio (CMRR), and low offset voltage, making it ideal for precision measurement systems. The AD620 belongs to the family of instrumentation amplifiers, which are essential building blocks in analog signal conditioning chains, often used after sensors such as strain gauges, thermocouples, and pressure sensors.
Key features of the AD620ARZ include a maximum supply current of 1.3 mA, making it suitable for battery-powered and portable applications. It offers a CMRR of 100 dB at gain of 10, and a low input offset voltage of 50 µV. The device also features low input bias current of 1.0 nA, and a bandwidth of 120 kHz at gain of 10. The AD620ARZ is specified over the industrial temperature range of -40°C to +85°C.
Technically, the AD620 uses a classic three-op-amp topology with an internal precision resistor network, achieving excellent gain accuracy and stability. The gain is set by an external resistor RG, with the formula G = 1 + 49.4 kΩ/RG. This architecture provides high input impedance (10 GΩ) and low noise, with a voltage noise density of 9 nV/√Hz at 1 kHz. The device is laser-trimmed for low offset voltage and drift, ensuring high precision over temperature.
Typical applications include medical instrumentation (ECG, EEG), industrial process control, transducer interfaces, and data acquisition systems. The AD620ARZ is particularly suited for applications where low power consumption and high accuracy are critical, such as portable medical devices and remote sensor nodes.
When designing with the AD620ARZ, it is important to provide proper decoupling on the power supply pins and to keep the input traces short and shielded to minimize noise pickup. The gain resistor should be placed close to the device to reduce parasitic capacitance and maintain accuracy.
Alternativas directas para AD620ARZ — 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 AD620ARZ (mismo factor de forma y huella) — difiere en Gain Range, Package, Quiescent Current, Operating Temperature Range, Input Bias Current.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
AD620BRZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD620AR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
INA128UA
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
TPA1286-SO1R
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD620ARZ Valores máximos y características eléctricas
| Amplifier Type | Instrumentation Amplifier |
| Number of Circuits | 1 |
| Gain Range | 1 to 10,000 |
| Supply Voltage Range | ±2.3 V to ±18 V |
| Supply Current (Max) | 1.3 mA |
| CMRR at Gain 10 | 100 dB |
| Input Offset Voltage | 50 µV |
| Input Bias Current | 1.0 nA |
| Bandwidth at Gain 10 | 120 kHz |
| Voltage Noise Density at 1 kHz | 9 nV/√Hz |
| Input Impedance | 10 GΩ |
| Rango de temperatura de funcionamiento | -40°C to +85°C |
| Encapsulado | 8-SOIC (0.154", 3.90mm Width) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Configuración de pines de AD620ARZ
| Pin 1 | RG — Gain setting resistor connection |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | REF — Reference voltage |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply |
| Pin 8 | RG — Gain setting resistor connection |
Aplicaciones típicas
AD620ARZ es adecuado para 6 aplicacións: Medical Instrumentation (ECG/EEG), Industrial Process Control, Data Acquisition Systems, Transducer Interfaces, Portable Medical Devices, Weigh Scales and Load Cells.
Medical Instrumentation (ECG/EEG)
The AD620ARZ is ideal for ECG and EEG systems due to its low noise (9 nV/√Hz) and high CMRR (100 dB at gain 10). It amplifies tiny bioelectric signals while rejecting common-mode interference from the body and power lines. Its low supply current (1.3 mA) supports battery-operated portable monitors. The gain set by one resistor simplifies channel calibration. For multi-channel systems, multiple AD620ARZ can be used with a multiplexed ADC. The device's high input impedance (10 GΩ) prevents loading of electrode signals. Its small SOIC package enables compact PCB layouts in wearable devices.
Recomendado
Industrial Process Control
In industrial settings, the AD620ARZ conditions signals from sensors like pressure transducers and thermocouples. Its wide supply range (±2.3V to ±18V) accommodates 24V industrial rails. The high CMRR rejects noise from motors and power lines. The gain resistor allows precise scaling of sensor outputs to match ADC input ranges. The device's industrial temperature range (-40°C to +85°C) ensures reliable operation in harsh environments. Its low drift maintains accuracy over temperature. The SOIC package is compatible with automated assembly for high-volume production.
Recomendado
Data Acquisition Systems
The AD620ARZ is a front-end amplifier in data acquisition systems, providing gain and common-mode rejection before ADC conversion. Its low noise and high input impedance preserve signal integrity. The gain set by one resistor allows flexible scaling for various sensor types. The device's bandwidth of 120 kHz at gain 10 supports moderate-speed sampling. Its low power consumption is beneficial for multi-channel systems. The SOIC package allows dense board layouts. The AD620ARZ is often paired with high-resolution ADCs to achieve system accuracy.
Recomendado
Transducer Interfaces
The AD620ARZ interfaces with various transducers, including strain gauges, load cells, and pressure sensors. Its high input impedance (10 GΩ) minimizes loading on bridge circuits. The low offset voltage (50 µV) reduces measurement error. The gain resistor allows precise calibration of full-scale output. The device's low noise ensures accurate detection of small signal changes. Its wide supply range supports both battery and line-powered systems. The SOIC package is suitable for compact sensor modules. The AD620ARZ's low power is ideal for remote sensors.
Recomendado
Portable Medical Devices
The AD620ARZ is well-suited for portable medical devices like wearable heart rate monitors and glucose meters. Its low supply current (1.3 mA) extends battery life. The device operates from low supply voltages (±2.3V), compatible with 3V batteries. Its small SOIC package enables miniaturized designs. The high CMRR reduces interference from motion artifacts. The low noise ensures reliable signal detection. The gain set by one resistor simplifies design. The industrial temperature range covers body-worn applications.
Recomendado
Weigh Scales and Load Cells
The AD620ARZ amplifies the small differential output of load cells in weigh scales. Its low offset voltage and drift ensure accurate weight measurements. The gain resistor sets the sensitivity to match the load cell's full-scale output. The high CMRR rejects common-mode noise from the bridge supply. The device's low noise improves resolution. Its wide supply range supports various power architectures. The SOIC package is suitable for compact scale electronics. The AD620ARZ's low power is beneficial for battery-operated scales.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AD620ARZ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | AD620BRZ | INA128UA | TPA1286-SO1R |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Texas Instruments | 3PEAK |
Diferenciadores clave
- Low supply current of 1.3 mA (frente a INA128UA)
- High CMRR of 100 dB at gain 10 (frente a INA128UA)
- Lower cost compared to AD620BRZ (frente a AD620BRZ)
Notas de diseño
Place decoupling capacitors (0.1 µF) close to the V+ and V- pins to minimize power supply noise. Use a ground plane to reduce noise pickup. Keep input traces short and shielded to minimize interference. The gain resistor RG should be placed close to pins 1 and 8 to reduce parasitic capacitance and maintain accuracy.
Ensure the gain resistor RG is a precision resistor (1% or better) to maintain gain accuracy. Avoid running high-frequency digital traces near the input pins to prevent noise coupling. The reference pin (REF) should be bypassed with a capacitor to ground to reduce noise. Do not exceed the absolute maximum supply voltage of ±18V.
The AD620ARZ dissipates minimal power due to its low supply current (1.3 mA). At maximum supply voltage (±18V), power dissipation is approximately 47 mW, which is well within the SOIC package's thermal limits. No external heatsinking is required. Ensure adequate copper area for heat dissipation in high-temperature environments.
Información de cumplimiento
RoHS compliant per distributor data. Other compliance information not specified in provided data.
