AD8512ARZ - Precision Low Noise JFET Op Amp | Analog Devices
部品番号: AD8512ARZ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $3.5 | $3.50 |
| 10 | $3.15 | $31.50 |
| 100 | $2.8 | $280.00 |
| 500 | $2.5 | $1,250.00 |
| 1,000 | $2.25 | $2,250.00 |
AD8512ARZ 概要
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output. It is a fundamental building block in analog electronics, used in applications such as amplification, filtering, and signal conditioning. Op amps are categorized by parameters like input offset voltage, input bias current, noise, bandwidth, and slew rate. The AD8512ARZ is a JFET-input op amp, which offers very high input impedance and low input bias current, making it suitable for interfacing with high-impedance sources.
Key features of the AD8512ARZ include a low offset voltage of typically 100 µV, low input bias current of 1 pA, and low voltage noise of 8 nV/√Hz. It has a gain bandwidth product of 8 MHz and a slew rate of 20 V/µs. The device operates from a supply voltage range of ±5 V to ±15 V, and its output can swing within 1 V of the rails. The AD8512ARZ is specified over the industrial temperature range of -40°C to +125°C.
The AD8512ARZ uses a precision JFET input stage that provides high input impedance and low bias current, combined with a bipolar output stage for robust drive capability. The device is designed for low noise and low distortion, making it suitable for audio and precision measurement applications. Its wide bandwidth and high slew rate allow it to handle fast signals without significant distortion.
Typical applications include precision instrumentation, active filters, data acquisition systems, and audio preamplifiers. The low input bias current makes it ideal for photodiode amplifiers and other high-impedance sensor interfaces. The device's low noise and low offset ensure accurate signal processing in precision measurement systems.
When designing with the AD8512ARZ, consider the input common-mode voltage range and ensure it is not exceeded. The device is stable with capacitive loads up to 500 pF, but for larger loads, an isolation resistor may be required. Proper decoupling of the power supply pins with 0.1 µF capacitors is recommended.
ドロップイン代替品: AD8512ARZ — 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: AD8512ARZ （同一形状・フットプリント） — 相違点: Slew Rate, Gain Bandwidth Product, Amplifier Type, Current - Supply, Voltage - Supply Span (Max).
クイック比較ツール — 並列比較する代替部品を選択:
AD8512ARZ-REEL
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD8512AR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD8628ARZ
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$1.49 / 個
データシートを見る →ADA4077-2ARZ
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$2.19 / 個
データシートを見る →AD820ARZ
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$2.2 / 個
データシートを見る →OPA2188
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
AD8512ARZ 最大定格＆電気的特性
| Amplifier Type | JFET |
| Number of Circuits | 2 |
| 出力タイプ | Rail-to-Rail |
| Slew Rate | 20 V/µs |
| Gain Bandwidth Product | 8 MHz |
| Current - Input Bias | 1 pA |
| Voltage - Input Offset | 100 µV |
| Current - Supply | 2.5 mA (x2 channels) |
| Current - Output / Channel | 70 mA |
| Voltage - Supply Span (Min) | ±5 V |
| Voltage - Supply Span (Max) | ±15 V |
| 動作温度 | -40°C to +125°C |
| パッケージ / ケース | 8-SOIC |
| 実装タイプ | Surface Mount |
| Voltage Noise | 8 nV/√Hz |
| Input Common-Mode Voltage Range | ±13 V (typical) |
| Capacitive Load Stability | 500 pF |
AD8512ARZ ピン構成
| ピン 1 | OUT A — Output of amplifier A |
| ピン 2 | -IN A — Inverting input of amplifier A |
| ピン 3 | +IN A — Non-inverting input of amplifier A |
| ピン 4 | V- — Negative power supply |
| ピン 5 | +IN B — Non-inverting input of amplifier B |
| ピン 6 | -IN B — Inverting input of amplifier B |
| ピン 7 | OUT B — Output of amplifier B |
| ピン 8 | V+ — Positive power supply |
主な用途
AD8512ARZ の用途: 6 件s: Precision Instrumentation, Active Filters, Data Acquisition Systems, Audio Preamplifiers, Photodiode Amplifiers, Medical Instrumentation.
Precision Instrumentation
The AD8512ARZ's low offset voltage (100 µV) and low input bias current (1 pA) make it ideal for precision instrumentation amplifiers. In a typical data acquisition system, the AD8512ARZ buffers high-impedance sensors, ensuring minimal loading and accurate signal transfer. Its low noise (8 nV/√Hz) preserves signal integrity, while the wide supply range (±5V to ±15V) accommodates various system rails. The dual-channel configuration allows simultaneous processing of multiple signals, reducing component count and board space. For best performance, use precision resistors and proper guarding techniques to minimize leakage currents.
おすすめ
Active Filters
The AD8512ARZ's 8 MHz gain bandwidth product and 20 V/µs slew rate enable high-frequency active filter designs. In a 4th-order low-pass filter, the AD8512ARZ provides sufficient loop gain to maintain accuracy up to 1 MHz. Its low offset and noise ensure minimal DC error and noise in the passband. The JFET input stage allows the use of high-value resistors without introducing significant bias current errors. For optimal performance, use low-tolerance capacitors and place the filter components close to the amplifier to minimize parasitic inductance.
おすすめ
Data Acquisition Systems
In data acquisition systems, the AD8512ARZ serves as a buffer or gain stage before the ADC. Its low input bias current (1 pA) minimizes errors when driving high-impedance sources, and its low noise (8 nV/√Hz) ensures accurate conversion. The wide bandwidth supports fast sampling rates, while the rail-to-rail output maximizes ADC input range. The dual-channel configuration is ideal for differential or multi-channel acquisition. To achieve 16-bit accuracy, ensure the amplifier's noise and offset are well below the ADC's LSB size, and use proper anti-aliasing filters.
おすすめ
Audio Preamplifiers
The AD8512ARZ's low voltage noise (8 nV/√Hz) and low distortion make it an excellent choice for audio preamplifiers. In a phono preamp, the AD8512ARZ amplifies low-level signals from a cartridge while maintaining a clean signal path. Its wide bandwidth (8 MHz) ensures accurate reproduction of high-frequency audio content, and its high slew rate (20 V/µs) prevents slew-induced distortion. The JFET input provides high input impedance, which is essential for matching high-impedance sources like guitar pickups. For best audio performance, use high-quality passive components and proper power supply decoupling.
おすすめ
Photodiode Amplifiers
The AD8512ARZ's extremely low input bias current (1 pA) is ideal for photodiode transimpedance amplifiers. In a photodiode circuit, the AD8512ARZ converts the small photocurrent into a voltage with minimal offset error. Its low voltage noise (8 nV/√Hz) ensures high signal-to-noise ratio, even for low light levels. The wide bandwidth supports fast optical signals, and the JFET input minimizes loading on the photodiode. To achieve optimal performance, use a feedback capacitor to compensate for the photodiode's capacitance and maintain stability.
おすすめ
Medical Instrumentation
In medical instrumentation, the AD8512ARZ is used in ECG and EEG amplifiers due to its low noise and low offset. Its low input bias current (1 pA) minimizes electrode polarization effects, and its high common-mode rejection ensures accurate measurement of small bio-signals. The wide supply range allows operation from battery or isolated supplies. The dual-channel configuration is useful for multi-lead monitoring. For safety, ensure proper isolation and use medical-grade power supplies. The AD8512ARZ's reliability and precision make it suitable for diagnostic equipment.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: AD8512ARZ — 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 | AD8512ARZ-REEL | AD8512AR | AD8628ARZ | ADA4077-2ARZ | OPA2188 |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Gain Bandwidth Product | 8 MHz | 8 MHz | 8 MHz | 2 MHz | 3.9 MHz | 2 MHz |
| Slew Rate | 20 V/µs | 20 V/µs | 20 V/µs | 1 V/µs | 1.2 V/µs | 0.8 V/µs |
| Input Offset Voltage | 100 µV | 100 µV | 100 µV | 50 µV | 15 µV | 0.5 µV |
| Input Bias Current | 1 pA | 1 pA | 1 pA | 30 pA | 0.5 nA | 150 pA |
| Voltage Noise | 8 nV/√Hz | 8 nV/√Hz | 8 nV/√Hz | 22 nV/√Hz | 7 nV/√Hz | 8 nV/√Hz |
| Supply Voltage Range | ±5V to ±15V | ±5V to ±15V | ±5V to ±15V | 2.7V to 5V | ±2.5V to ±18V | 4.5V to 36V |
主な差別化要因
- Ultra-low input bias current of 1 pA （vs ADA4077-2ARZ)
- Higher slew rate of 20 V/µs （vs AD8628ARZ)
- Wider supply voltage range （vs AD8628ARZ)
設計ノート
Proper power supply decoupling is critical for the AD8512ARZ. Place 0.1 µF ceramic capacitors close to the V+ and V- pins, and optionally add 10 µF tantalum capacitors for lower frequency decoupling. This minimizes power supply noise and ensures stable operation, especially in high-gain applications.
For optimal performance, use a ground plane and keep the input traces short and shielded. The AD8512ARZ has very low input bias current (1 pA), so minimize leakage paths by cleaning the PCB and using guard rings around the inputs. This is especially important in high-impedance applications like photodiode amplifiers.
Do not exceed the input common-mode voltage range, which is typically ±13 V for ±15 V supplies. Exceeding this range can cause phase reversal and output saturation. Also, the device is stable with capacitive loads up to 500 pF; for larger loads, add an isolation resistor (e.g., 50 Ω) in series with the output to maintain stability.
コンプライアンス情報
The 'Z' suffix indicates lead-free and RoHS compliant. AEC-Q100 not applicable for this commercial-grade part.
