AD620ARZ - Low Cost Low Power Instrumentation Amplifier | Analog Devices
部品番号: AD620ARZ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 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 概要
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.
ドロップイン代替品: AD620ARZ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: AD620ARZ （同一形状・フットプリント） — 相違点: Gain Range, Package, Quiescent Current, Operating Temperature Range, Input Bias Current.
クイック比較ツール — 並列比較する代替部品を選択:
AD620BRZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD620AR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA128UA
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
TPA1286-SO1R
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD620ARZ 最大定格＆電気的特性
| 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 |
| 動作温度範囲 | -40°C to +85°C |
| パッケージ | 8-SOIC (0.154", 3.90mm Width) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
AD620ARZ ピン構成
| ピン 1 | RG — Gain setting resistor connection |
| ピン 2 | -IN — Inverting input |
| ピン 3 | +IN — Non-inverting input |
| ピン 4 | V- — Negative supply |
| ピン 5 | REF — Reference voltage |
| ピン 6 | OUT — Output |
| ピン 7 | V+ — Positive supply |
| ピン 8 | RG — Gain setting resistor connection |
主な用途
AD620ARZ の用途: 6 件s: 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.
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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.
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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.
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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.
おすすめ
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.
おすすめ
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.
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おすすめ製品の概要
エンジニアリング参考データ: AD620ARZ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | AD620BRZ | INA128UA | TPA1286-SO1R |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Texas Instruments | 3PEAK |
主な差別化要因
- Low supply current of 1.3 mA （vs INA128UA)
- High CMRR of 100 dB at gain 10 （vs INA128UA)
- Lower cost compared to AD620BRZ （vs AD620BRZ)
設計ノート
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.
コンプライアンス情報
RoHS compliant per distributor data. Other compliance information not specified in provided data.
