OPA827 - Low-Noise JFET Op Amp | Texas Instruments
料号： OPA827 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.24 | $1,620.00 |
| 1,000 | $2.88 | $2,880.00 |
OPA827 概述
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.
直接替换替代料： OPA827 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： OPA827 （相同外形与封装尺寸） ——差异在于 Slew Rate, Amplifier Type, Gain Bandwidth Product, Supply Voltage Range, Input Bias Current.
快速对比工具——选择替代料号进行并排对比：
OPA828IDR
✅ 直接替换✓ 有现货
$1.75 / 个
查看数据手册 →OPA2828
✅ 直接替换📋 参考替代料（不在目录中）
OPA827AID
✅ 直接替换📋 参考替代料（不在目录中）
OPA827AIDR
✅ 直接替换📋 参考替代料（不在目录中）
ADA4627-1ARZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADA4610-1ARZ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.82 / 个
查看数据手册 →OPA827 最大额定值与电气特性
| 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 |
| 工作温度范围 | -40°C to +125°C |
| Package Options | 8-SOIC, 8-VSSOP |
| RoHS 状态 | Compliant |
OPA827 引脚配置
| 引脚 1 | OFFSET N1 — Offset null pin 1 |
| 引脚 2 | IN- — Inverting input |
| 引脚 3 | IN+ — Non-inverting input |
| 引脚 4 | V- — Negative supply |
| 引脚 5 | OFFSET N2 — Offset null pin 2 |
| 引脚 6 | OUT — Output |
| 引脚 7 | V+ — Positive supply |
| 引脚 8 | NC — No connection |
典型应用
OPA827 适用于 6 应用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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： OPA827 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Lower input offset voltage (150 µV max) compared to OPA828 （对比 OPA828)
- Lower input bias current (3 pA) compared to ADA4627-1ARZ （对比 ADA4627-1ARZ)
- Wider supply voltage range (±18 V) compared to ADA4627-1ARZ （对比 ADA4627-1ARZ)
设计说明
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.
合规信息
RoHS compliant per TI product page. Not AEC-Q100 qualified.
