AD8656ARZ - Dual 3nV Precision CMOS Op Amp | Analog Devices
料号： AD8656ARZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.82 | $1,820.00 |
AD8656ARZ 概述
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 signal conditioning, filtering, and buffering. The AD8656 belongs to the precision CMOS amplifier family, which is a subset of operational amplifiers optimized for low offset, low noise, and low drift. These amplifiers are essential in applications requiring accurate signal amplification, such as sensor interfaces, data acquisition systems, and medical instrumentation.
Key features of the AD8656ARZ include a supply voltage range of 2.7 V to 5.5 V, a gain-bandwidth product of 28 MHz, and a slew rate of 11 V/µs. The device operates over the industrial temperature range of -40°C to +125°C. The low noise and low distortion performance, combined with rail-to-rail inputs and outputs, make it ideal for driving high-resolution ADCs and audio signal chains. The DigiTrim technology ensures precise offset voltage, reducing the need for external calibration.
Technically, the AD8656 uses a CMOS process with DigiTrim, which is a proprietary trimming technique that adjusts the offset voltage during manufacturing. This results in a maximum offset voltage of 250 µV over the common-mode range, which is significantly lower than standard CMOS amplifiers. The amplifier also features a high common-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR), enhancing its performance in noisy environments. The output stage is capable of driving capacitive loads, making it suitable for ADC buffer applications.
Typical applications include precision sensor signal conditioning, ADC drivers, active filters, and audio processing. The low noise and low distortion make it particularly well-suited for high-end audio equipment and medical devices where signal integrity is critical. The rail-to-rail output allows full-scale signal swing, maximizing the dynamic range in single-supply systems.
When designing with the AD8656, it is important to provide adequate power supply decoupling with 0.1 µF and 10 µF capacitors close to the supply pins. Additionally, the input common-mode voltage should be kept within the specified range to avoid performance degradation. The device is RoHS compliant and available in tape and reel packaging.
直接替换替代料： AD8656ARZ ——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： AD8656ARZ （相同外形与封装尺寸） ——差异在于 Slew Rate, Amplifier Type, Gain Bandwidth Product, Operating Temperature, Package.
快速对比工具——选择替代料号进行并排对比：
AD8655ARZ
✅ 直接替换✓ 有现货
$1.91 / 个
查看数据手册 →OPA2134UA/2K5
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.45 / 个
查看数据手册 →LM4562MA/NOPB
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD8620ARZ
✅ 直接替换✓ 有现货
$8.5 / 个
查看数据手册 →ADA4610-2ARZ
✅ 直接替换✓ 有现货
$2.19 / 个
查看数据手册 →AD8656ARZ 最大额定值与电气特性
| Number of Channels | 2 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Input Offset Voltage (max) | 250 µV over VCM |
| Voltage Noise Density | 2.7 nV/√Hz at 10 kHz |
| THD+N | 0.0007% |
| Gain-Bandwidth Product | 28 MHz |
| Slew Rate | 11 V/µs |
| Input Type | Rail-to-Rail |
| 输出类型 | Rail-to-Rail |
| 工作温度范围 | -40°C to +125°C |
| 封装 | 8-SOIC |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Amplifier Type | CMOS |
| Technology | DigiTrim |
AD8656ARZ 引脚配置
| 引脚 1 | OUT A — Output of amplifier A |
| 引脚 2 | -IN A — Inverting input of amplifier A |
| 引脚 3 | +IN A — Non-inverting input of amplifier A |
| 引脚 4 | V- — Negative supply voltage |
| 引脚 5 | +IN B — Non-inverting input of amplifier B |
| 引脚 6 | -IN B — Inverting input of amplifier B |
| 引脚 7 | OUT B — Output of amplifier B |
| 引脚 8 | V+ — Positive supply voltage |
典型应用
AD8656ARZ 适用于 6 应用s: Precision Sensor Signal Conditioning, ADC Driver, Active Filters, Audio Processing, Medical Instrumentation, Battery-Powered Devices.
Precision Sensor Signal Conditioning
The AD8656ARZ's low input offset voltage (250 µV max) and low noise (2.7 nV/√Hz) make it ideal for amplifying small sensor signals, such as those from thermocouples or strain gauges. Its rail-to-rail output allows full-scale signal swing, maximizing dynamic range in single-supply systems. The dual-channel configuration enables simultaneous conditioning of multiple sensors, reducing component count and board space. The high CMRR and PSRR reject common-mode noise and power supply variations, ensuring accurate measurements in industrial environments.
推荐
ADC Driver
The AD8656ARZ is well-suited for driving high-resolution ADCs, such as the AD7172-2, due to its low noise and low distortion. Its rail-to-rail output can swing close to the ADC's full-scale input range, maximizing the signal-to-noise ratio. The fast slew rate (11 V/µs) ensures accurate settling for high-speed sampling. The dual-channel configuration allows driving two ADC inputs or implementing a differential driver with a single IC. The low output impedance ensures stable driving of the ADC's sampling capacitor.
推荐
Active Filters
The AD8656ARZ's 28 MHz gain-bandwidth product and low noise make it suitable for active filter designs, such as low-pass or band-pass filters in communication systems. Its rail-to-rail input and output allow wide dynamic range, and the low distortion (0.0007% THD+N) preserves signal integrity. The dual-channel configuration enables implementing a second-order filter with a single IC, saving space. The high slew rate ensures minimal distortion for large signal swings.
推荐
Audio Processing
The AD8656ARZ's low noise (2.7 nV/√Hz) and low THD+N (0.0007%) make it an excellent choice for high-fidelity audio applications, such as headphone amplifiers or audio mixers. Its rail-to-rail output can drive headphones directly without additional circuitry. The dual-channel configuration is ideal for stereo audio paths. The wide supply voltage range (2.7 V to 5.5 V) allows operation from a single lithium-ion battery, making it suitable for portable audio devices.
推荐
Medical Instrumentation
The AD8656ARZ's precision and low noise are critical for medical devices such as ECG or EEG amplifiers, where signal integrity is paramount. Its low offset voltage (250 µV max) ensures accurate biopotential measurements, and the rail-to-rail output allows interfacing with ADCs. The dual-channel configuration can be used for multi-lead measurements. The industrial temperature range (-40°C to +125°C) ensures reliable operation in clinical environments.
推荐
Battery-Powered Devices
The AD8656ARZ's low supply voltage (2.7 V) and low quiescent current make it suitable for battery-powered devices, such as portable sensors or wearables. Its rail-to-rail input and output maximize signal swing with limited supply headroom. The low noise ensures accurate signal processing even with weak sensor outputs. The dual-channel configuration reduces component count, saving board space and power. The device is available in a small 8-SOIC package, ideal for compact designs.
推荐
推荐产品汇总
工程参考数据： AD8656ARZ ——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 | AD8656ARMZ | AD8655ARZ | OPA2134UA/2K5 | LM4562MA/NOPB | AD8620ARZ | ADA4610-2ARZ |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-MSOP | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| Number of Channels | 2 | 2 | 1 | 2 | 2 | 2 | 2 |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | ±2.5 V to ±18 V | ±2.5 V to ±17 V | ±5 V to ±13 V | ±5 V to ±15 V |
| Input Offset Voltage (max) | 250 µV | 250 µV | 250 µV | 500 µV | 100 µV | 100 µV | 400 µV |
| Voltage Noise Density | 2.7 nV/√Hz | 2.7 nV/√Hz | 2.7 nV/√Hz | 8 nV/√Hz | 2.7 nV/√Hz | 6 nV/√Hz | 7.3 nV/√Hz |
| Gain-Bandwidth Product | 28 MHz | 28 MHz | 28 MHz | 8 MHz | 55 MHz | 25 MHz | 16.3 MHz |
| Slew Rate | 11 V/µs | 11 V/µs | 11 V/µs | 20 V/µs | 20 V/µs | 25 V/µs | 16 V/µs |
关键差异点
- Lowest noise in its class （对比 OPA2134UA/2K5)
- DigiTrim technology for low offset （对比 LM4562MA/NOPB)
- Rail-to-rail input and output （对比 AD8620ARZ)
设计说明
Ensure proper power supply decoupling by placing 0.1 µF and 10 µF capacitors as close as possible to the V+ and V- pins. This minimizes high-frequency noise and ensures stable operation. For single-supply applications, connect V- to ground and use a single 2.7 V to 5.5 V supply.
For optimal noise performance, use a ground plane and keep input traces short and shielded. Avoid routing high-frequency digital signals near the input pins. Use surface-mount components to minimize parasitic inductance and capacitance.
Do not exceed the absolute maximum supply voltage of 6 V, as this can damage the device. Also, ensure the input common-mode voltage stays within the specified range to avoid phase reversal. For ADC driving applications, consider adding a small series resistor (e.g., 10 Ω) to isolate the amplifier output from the ADC's sampling capacitor.
合规信息
RoHS compliant per Analog Devices product page. No AEC-Q100 qualification indicated for this part.
