OPA827 - Low-Noise JFET Op Amp | Texas Instruments
MPN： OPA827 ✓ 啟用中OPA827 概覽
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, used in signal conditioning, filtering, and instrumentation. The OPA827 belongs to the JFET-input op amp family, which offers very high input impedance and low input bias current, making it ideal for interfacing with high-impedance sources such as sensors and photodiodes. Within the hierarchy of analog ICs, it is a precision amplifier, a subset of linear amplifiers, and part of the broader signal chain IC category.
Key features of the OPA827 include its low offset voltage (150 µV max), low drift (0.5 µV/°C typ), low bias current (3 pA typ), and low noise (4 nV/√Hz at 10 kHz, 250 nVPP 0.1-10 Hz). It also offers a high open-loop gain of 120 dB, a gain bandwidth product of 22 MHz, and a slew rate of 28 V/µs. The device is fully specified over the extended temperature range and is RoHS compliant.
Technically, the OPA827 uses a JFET input stage to achieve its low bias current and high input impedance, while a precision bipolar output stage provides low output impedance and high drive capability. The amplifier is internally compensated for unity-gain stability, simplifying design. Its low distortion and high linearity make it suitable for high-performance audio and precision instrumentation.
Typical applications include high-end audio preamplifiers and DAC output buffers, precision data acquisition systems, active filters, and sensor signal conditioning. The low noise and low bias current are particularly beneficial in photodiode amplifiers and medical instrumentation.
When designing with the OPA827, ensure proper decoupling of the power supply pins with 0.1 µF ceramic capacitors placed close to the device, as recommended in the datasheet. Also, consider the input common-mode range and output swing limitations for your specific supply voltages.
直接替換替代品，適用於 OPA827 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： OPA827 （相同外形與佔位） — 差異在於 Slew Rate, Amplifier Type, Gain Bandwidth Product, Supply Voltage Range, Input Bias Current.
OPA828IDR
✅ 直接替換聯絡詢價
查看資料表 →OPA2828
✅ 直接替換📋 參考替代品（不在目錄中）
OPA827AID
✅ 直接替換📋 參考替代品（不在目錄中）
OPA827AIDR
✅ 直接替換📋 參考替代品（不在目錄中）
ADA4627-1ARZ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADA4610-1ARZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →OPA827 最大額定值與電氣特性
| Number of Channels | 1 |
| Supply Voltage Range (Dual) | ±4 V to ±18 V |
| Supply Voltage Range (Single) | 8 V to 36 V |
| Input Offset Voltage (Max) | 150 µV |
| Input Offset Drift (Typ) | 0.5 µV/°C |
| Input Bias Current (Typ) | 3 pA |
| Input Voltage Noise Density (10 kHz) | 4 nV/√Hz |
| Input Voltage Noise (0.1-10 Hz) | 250 nVPP |
| Gain Bandwidth Product | 22 MHz |
| Slew Rate | 28 V/µs |
| Open-Loop Gain | 120 dB |
| Output Current (Typ) | 30 mA |
| 工作溫度範圍 | -40°C to +125°C |
| Package Options | 8-SOIC, 8-VSSOP |
| RoHS 狀態 | Compliant |
OPA827 腳位配置
| 腳位 1 | OFFSET N1 — Offset null pin 1 |
| 腳位 2 | IN- — Inverting input |
| 腳位 3 | IN+ — Non-inverting input |
| 腳位 4 | V- — Negative supply |
| 腳位 5 | OFFSET N2 — Offset null pin 2 |
| 腳位 6 | OUT — Output |
| 腳位 7 | V+ — Positive supply |
| 腳位 8 | NC — No connection |
典型應用
OPA827 適用於 6 應用s: High-End Audio Preamplifier, Precision Data Acquisition, Active Filter, Photodiode Amplifier, Medical Instrumentation, Test and Measurement.
High-End Audio Preamplifier
The OPA827's low noise (4 nV/√Hz) and low distortion make it ideal for high-end audio preamplifiers. It provides clean signal amplification with minimal coloration, preserving audio fidelity. Its high slew rate (28 V/µs) ensures accurate reproduction of fast transients, while its low offset voltage (150 µV) eliminates the need for DC blocking capacitors in many designs.
推薦
Precision Data Acquisition
In precision data acquisition systems, the OPA827's low offset voltage (150 µV max) and low drift (0.5 µV/°C) ensure accurate signal conditioning. Its low bias current (3 pA) minimizes errors when interfacing with high-impedance sensors. The wide supply range (up to ±18 V) accommodates various ADC input ranges, and its 22 MHz bandwidth supports high-speed sampling.
推薦
Active Filter
The OPA827 is well-suited for active filters due to its high open-loop gain (120 dB) and unity-gain stability. Its low noise and low distortion preserve signal integrity in filters for audio and instrumentation. The 22 MHz gain bandwidth product allows implementation of filters up to several MHz, while the JFET input minimizes loading on preceding stages.
推薦
Photodiode Amplifier
The OPA827's low input bias current (3 pA) and low voltage noise (4 nV/√Hz) make it excellent for photodiode transimpedance amplifiers. It accurately converts small photocurrents to voltage with minimal error. The high bandwidth (22 MHz) supports fast optical signals, and the low offset voltage reduces DC errors in the output.
推薦
Medical Instrumentation
In medical instrumentation, the OPA827's precision and low noise are critical for accurate signal acquisition. Its low offset voltage and drift ensure reliable measurements over temperature. The low bias current is ideal for high-impedance electrodes, and the wide supply range supports various medical device power rails. The device's reliability and extended temperature range (-40°C to +125°C) make it suitable for demanding medical environments.
推薦
Test and Measurement
The OPA827 is ideal for test and measurement equipment due to its high precision and low noise. It provides accurate signal conditioning in oscilloscopes, spectrum analyzers, and data loggers. Its low offset voltage and drift ensure measurement accuracy, while the high bandwidth supports high-frequency signals. The JFET input minimizes loading on the device under test.
推薦
推薦產品摘要
工程參考資料，適用於 OPA827 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | OPA828 | OPA2828 | ADA4627-1ARZ |
|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOIC-8 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Input Offset Voltage (Max) | 150 µV | 500 µV | 500 µV | 200 µV |
| Input Bias Current (Typ) | 3 pA | 10 pA | 10 pA | 10 pA |
| Voltage Noise Density (10 kHz) | 4 nV/√Hz | 4 nV/√Hz | 4 nV/√Hz | 3.8 nV/√Hz |
| Gain Bandwidth Product | 22 MHz | 45 MHz | 45 MHz | 19 MHz |
| Slew Rate | 28 V/µs | 150 V/µs | 150 V/µs | 48 V/µs |
| Supply Voltage Range (Dual) | ±4 V to ±18 V | ±4 V to ±18 V | ±4 V to ±18 V | ±5 V to ±15 V |
主要差異化特點
- Lower input offset voltage (150 µV max) compared to OPA828 (對比OPA828)
- Lower input bias current (3 pA) compared to ADA4627-1ARZ (對比ADA4627-1ARZ)
- Wider supply voltage range (±18 V) compared to ADA4627-1ARZ (對比ADA4627-1ARZ)
設計說明
Decouple the power supply pins with 0.1 µF ceramic capacitors placed as close as possible to the V+ and V- pins. Additionally, use a 10 µF tantalum capacitor in parallel for low-frequency decoupling. This is critical for maintaining the OPA827's low noise performance, as power supply noise can couple into the output.
For optimal performance, use a ground plane and keep the input traces short and shielded. The OPA827's JFET input has very high impedance, making it susceptible to noise pickup. Avoid routing high-speed digital traces near the input pins. Also, consider adding a guard ring around the input pins to reduce leakage currents.
Do not exceed the absolute maximum supply voltage of ±20 V. Also, ensure the input common-mode voltage stays within the specified range to avoid phase reversal. When using the offset null pins, connect a potentiometer between them and the wiper to V- to adjust offset, but note that this may affect drift.
合規資訊
RoHS compliant per TI product page. Not AEC-Q100 qualified.
