ADA4528-2ARMZ-RL7 - Zero-Drift Dual Op Amp | Analog Devices
料号： ADA4528-2ARMZ-RL7 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.19 | $2,190.00 |
ADA4528-2ARMZ-RL7 概述
Zero-drift amplifiers, also known as auto-zero or chopper amplifiers, are a class of operational amplifiers that continuously correct their input offset voltage and drift using a switching technique. This results in extremely low offset voltage (typically 2 µV) and near-zero drift over temperature, making them essential for high-precision DC measurement systems. The ADA4528-2 belongs to the precision op amp family, which is a subset of linear amplifiers used in signal conditioning chains.
Key features include ultralow voltage noise density of 5.6 nV/√Hz, a gain-bandwidth product of 6.5 MHz, and a slew rate of 3.4 V/µs. The device also offers excellent CMRR and PSRR specifications, ensuring accurate amplification in noisy environments. The rail-to-rail input and output stages maximize dynamic range, particularly in low-voltage single-supply applications.
The ADA4528-2 uses a proprietary auto-zero architecture that eliminates 1/f noise, providing a flat noise spectrum down to DC. This makes it superior to conventional amplifiers for DC precision applications. The device is specified over the extended industrial temperature range of -40°C to +125°C, ensuring reliable operation in harsh environments.
Typical applications include precision sensor interfaces, thermocouple amplifiers, load cell signal conditioning, and battery-powered instrumentation. The low supply current of 1.5 mA per amplifier makes it suitable for portable devices.
When designing with this device, ensure proper decoupling of the power supply pins with 0.1 µF ceramic capacitors placed close to the IC. The input common-mode range includes both rails, allowing direct interface with sensors without level shifting.
直接替换替代料： ADA4528-2ARMZ-RL7 ——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： ADA4528-2ARMZ-RL7 （相同外形与封装尺寸） ——差异在于 Slew Rate, RoHS Status, Amplifier Type, Bandwidth (-3 dB), Rail-to-Rail Input/Output.
快速对比工具——选择替代料号进行并排对比：
ADA4528-2ARMZ-R7
✅ 直接替换📋 参考替代料（不在目录中）
ADA4528-2ARMZ
✅ 直接替换✓ 有现货
$2.8 / 个
查看数据手册 →ADA4522-2ARMZ-R7
✅ 直接替换📋 参考替代料（不在目录中）
ADA4528-2ARMZ-RL7 最大额定值与电气特性
| Number of Channels | 2 |
| Supply Voltage Range | 2.2 V to 5.5 V |
| Supply Voltage Range (Dual) | ±1.1 V to ±2.75 V |
| Input Offset Voltage | 2 µV (typical) |
| Input Bias Current | 125 pA (typical) |
| Voltage Noise Density | 5.6 nV/√Hz |
| Gain Bandwidth Product | 6.5 MHz |
| Slew Rate | 3.4 V/µs |
| CMRR | 140 dB (typical) |
| PSRR | 140 dB (typical) |
| Rail-to-Rail Input/Output | Yes |
| Supply Current (per Amp) | 1.5 mA |
| 工作温度范围 | -40°C to +125°C |
| 封装 | 8-MSOP |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
ADA4528-2ARMZ-RL7 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 (ground in single-supply operation) |
| 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 |
典型应用
ADA4528-2ARMZ-RL7 适用于 6 应用s: Precision Sensor Interfaces, Medical Instrumentation, Thermocouple Amplifiers, Battery-Powered Instrumentation, Weigh Scales and Load Cells, Data Acquisition Systems.
Precision Sensor Interfaces
The ADA4528-2's ultralow offset (2 µV) and drift make it ideal for amplifying signals from position sensors, pressure sensors, and strain gages. Its rail-to-rail input allows direct connection to sensor bridges without level shifting, and the low noise (5.6 nV/√Hz) preserves signal integrity. In a typical load cell interface, the op amp amplifies the millivolt-level bridge output to a range suitable for an ADC, achieving high accuracy over temperature.
推荐
Medical Instrumentation
In medical devices such as patient monitors and diagnostic equipment, the ADA4528-2 provides the precision needed for biosignal amplification. Its low offset and drift ensure accurate DC measurements, while the low noise is critical for ECG and EEG signals that are in the microvolt range. The wide supply range (2.2 V to 5.5 V) allows operation from battery or USB power, and the small MSOP package saves board space in portable devices.
推荐
Thermocouple Amplifiers
Thermocouples produce very small voltages (tens of microvolts per degree) that require high-gain, low-offset amplification. The ADA4528-2's zero-drift architecture eliminates offset drift that would otherwise cause temperature measurement errors. Its low bias current (125 pA) minimizes loading on the thermocouple, and the rail-to-rail output allows direct interface with ADCs. The device operates over the full industrial temperature range, making it suitable for process control and HVAC systems.
推荐
Battery-Powered Instrumentation
The ADA4528-2's low supply current (1.5 mA per amplifier) and wide supply range make it ideal for battery-powered instruments. It can operate directly from a 3.3 V or 5 V rail, and its rail-to-rail output maximizes dynamic range for the ADC. The zero-drift feature ensures stable measurements over the battery's discharge cycle, and the small MSOP package is perfect for handheld devices. Applications include portable gas detectors, pH meters, and field transmitters.
推荐
Weigh Scales and Load Cells
Load cell signals are typically a few millivolts at full scale, requiring precise amplification. The ADA4528-2's ultralow offset (2 µV) and drift ensure accurate weight readings over time and temperature. Its high CMRR (140 dB) rejects common-mode noise from the bridge supply, and the low noise (5.6 nV/√Hz) allows high resolution. The dual op amp can be used for both the main amplifier and a buffer for the reference voltage, simplifying the design.
推荐
Data Acquisition Systems
In multi-channel data acquisition systems, the ADA4528-2 provides precision signal conditioning before the ADC. Its low offset and drift ensure accurate DC measurements, while the 6.5 MHz bandwidth supports higher-speed signals. The rail-to-rail output allows full-scale use of the ADC input range, and the dual configuration saves space. The device is ideal for industrial automation, test equipment, and environmental monitoring systems.
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推荐产品汇总
工程参考数据： ADA4528-2ARMZ-RL7 ——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 | ADA4528-2ARMZ-R7 | ADA4528-2ARMZ | ADA4522-2ARMZ-R7 |
|---|---|---|---|---|
| Package | 8-MSOP | 8-MSOP | 8-MSOP | 8-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 2 | 2 | 2 | 2 |
| Input Offset Voltage | 2 µV | 2 µV | 2 µV | 10 µV |
| Voltage Noise Density | 5.6 nV/√Hz | 5.6 nV/√Hz | 5.6 nV/√Hz | 12 nV/√Hz |
| Gain Bandwidth Product | 6.5 MHz | 6.5 MHz | 6.5 MHz | 2.7 MHz |
| Supply Voltage Range | 2.2 V to 5.5 V | 2.2 V to 5.5 V | 2.2 V to 5.5 V | 2.7 V to 5.5 V |
| Rail-to-Rail I/O | Yes | Yes | Yes | Yes |
关键差异点
- Ultralow offset voltage of 2 µV （对比 ADA4522-2ARMZ-R7)
- Lower voltage noise density （对比 ADA4522-2ARMZ-R7)
- Higher bandwidth （对比 ADA4522-2ARMZ-R7)
设计说明
Bypass each supply pin with a 0.1 µF ceramic capacitor placed as close to the pin as possible. For best performance, use a 10 µF tantalum capacitor in parallel for low-frequency decoupling. The ADA4528-2 operates from 2.2 V to 5.5 V, so ensure the supply is clean and within this range to avoid output errors.
For optimal noise performance, keep the input traces short and shielded from digital signals. Use a ground plane under the op amp and avoid routing high-frequency signals near the inputs. The MSOP package has a thermal pad that should be soldered to a copper pour for better heat dissipation, though power dissipation is typically low.
Do not exceed the absolute maximum supply voltage of 6 V. The input common-mode range includes both rails, but avoid driving inputs beyond the rails by more than 0.3 V. For best offset performance, use metal-film resistors in the feedback network to minimize thermoelectric voltages.
合规信息
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
