ADA4805-2ARMZ - Dual 105MHz Low Power Op Amp | Analog Devices
料号： ADA4805-2ARMZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.79 | $3.79 |
| 10 | $3.45 | $34.50 |
| 100 | $2.98 | $298.00 |
| 500 | $2.65 | $1,325.00 |
| 1,000 | $2.4 | $2,400.00 |
ADA4805-2ARMZ 概述
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and typically a single-ended output. It is a fundamental building block in analog electronics, used in signal conditioning, filtering, and buffering applications. The ADA4805-2 is a voltage feedback amplifier, which provides high bandwidth and low distortion, suitable for driving ADCs and other precision circuits. In the hierarchy of analog ICs, it falls under amplifiers, then operational amplifiers, then high-speed op amps, and finally low-power high-speed op amps.
Key features of the ADA4805-2 include a 105 MHz bandwidth, a slew rate of 225 V/µs, and a low input voltage noise of 3.1 nV/√Hz. The rail-to-rail output stage allows maximum dynamic range, especially in single-supply applications. The low quiescent current of 500 µA per amplifier makes it suitable for battery-powered and portable instrumentation. The device also features a low offset voltage of 0.2 µV/°C drift, ensuring accuracy over temperature.
Technically, the ADA4805-2 uses a complementary bipolar process, providing high speed and low noise. The amplifier is stable with capacitive loads up to 100 pF, and its output can swing within 50 mV of the rails. The input common-mode range extends beyond the rails, allowing overvoltage protection. The device is specified over the industrial temperature range of -40°C to +125°C.
Typical applications include portable instrumentation, battery-powered medical devices, active filters, and ADC driver circuits. The low power and high speed make it ideal for high-resolution data acquisition systems where power efficiency is critical. The rail-to-rail output ensures full-scale signal swing, maximizing the dynamic range of the ADC.
When designing with the ADA4805-2, ensure proper decoupling of the power supply pins with 0.1 µF ceramic capacitors placed close to the device. The MSOP package has a thermal resistance of 190°C/W, so consider power dissipation in high-temperature environments. For best performance, use a solid ground plane and minimize parasitic capacitance on the inputs.
直接替换替代料： ADA4805-2ARMZ ——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： ADA4805-2ARMZ （相同外形与封装尺寸） ——差异在于 Input Voltage Noise Density, Package, Slew Rate, Quiescent Current per Amplifier, Supply Voltage Range (Dual).
快速对比工具——选择替代料号进行并排对比：
ADA4805-2TRMZ-EP
✅ 直接替换📋 参考替代料（不在目录中）
ADA4805-2ARMZ-R7
✅ 直接替换📋 参考替代料（不在目录中）
ADA4805-2TRMZ-EPR7
✅ 直接替换📋 参考替代料（不在目录中）
ADA4807-2ARMZ
✅ 直接替换✓ 有现货
$1.82 / 个
查看数据手册 →ADA4805-2ARMZ 最大额定值与电气特性
| Number of Channels | 2 |
| Amplifier Type | Voltage Feedback |
| Bandwidth (-3dB) | 105 MHz |
| Slew Rate | 225 V/µs |
| Quiescent Current per Amplifier | 500 µA |
| Supply Voltage Range (Dual) | ±1.5 V to ±5 V |
| Supply Voltage Range (Single) | 3 V to 5 V |
| Input Voltage Noise | 3.1 nV/√Hz |
| Offset Voltage Drift | 0.2 µV/°C |
| 输出类型 | Rail-to-Rail |
| 封装 | 8-MSOP |
| 工作温度范围 | -40°C to +125°C |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| MSL 等级 | 1 |
ADA4805-2ARMZ 引脚配置
| 引脚 1 | OUT1 — Output of amplifier 1 |
| 引脚 2 | -IN1 — Inverting input of amplifier 1 |
| 引脚 3 | +IN1 — Non-inverting input of amplifier 1 |
| 引脚 4 | V- — Negative supply voltage |
| 引脚 5 | +IN2 — Non-inverting input of amplifier 2 |
| 引脚 6 | -IN2 — Inverting input of amplifier 2 |
| 引脚 7 | OUT2 — Output of amplifier 2 |
| 引脚 8 | V+ — Positive supply voltage |
典型应用
ADA4805-2ARMZ 适用于 6 应用s: Portable Instrumentation, Battery-Powered Medical Devices, ADC Driver Circuits, Active Filters, High-Speed Data Acquisition, Test and Measurement Equipment.
Portable Instrumentation
The ADA4805-2ARMZ's low quiescent current of 500 µA per amplifier and wide supply range from ±1.5 V to ±5 V make it ideal for battery-powered portable instruments. Its 105 MHz bandwidth and rail-to-rail output ensure accurate signal conditioning in handheld multimeters, data loggers, and portable medical devices. The low noise of 3.1 nV/√Hz preserves signal integrity in precision measurement circuits. With an MSOP-8 package, it saves board space in compact designs. The amplifier can drive high-resolution ADCs directly, reducing component count and power consumption in portable systems.
推荐
Battery-Powered Medical Devices
In battery-powered medical devices such as glucose monitors and wearable health trackers, the ADA4805-2ARMZ provides high-speed signal conditioning with minimal power consumption. Its 500 µA quiescent current extends battery life, while the 105 MHz bandwidth supports fast signal processing for ECG and EEG signals. The rail-to-rail output maximizes dynamic range in single-supply 3 V systems. The low offset drift of 0.2 µV/°C ensures accurate measurements over temperature. The MSOP-8 package is suitable for compact medical device PCBs. The amplifier's low noise is critical for detecting weak biomedical signals.
推荐
ADC Driver Circuits
The ADA4805-2ARMZ is an excellent choice for driving high-resolution ADCs in data acquisition systems. Its 105 MHz bandwidth and 225 V/µs slew rate allow it to settle quickly for accurate sampling. The low output impedance and rail-to-rail output ensure full-scale signal swing to the ADC input. The low noise of 3.1 nV/√Hz minimizes noise contribution to the conversion. The amplifier can drive capacitive loads up to 100 pF, making it stable with ADC input capacitance. In multi-channel systems, the dual-channel configuration saves space and power. The wide supply range accommodates various ADC supply voltages.
推荐
Active Filters
The ADA4805-2ARMZ is well-suited for active filter designs in communication and instrumentation systems. Its 105 MHz bandwidth allows implementation of high-frequency filters with minimal phase error. The low quiescent current makes it efficient for multi-stage filters. The rail-to-rail output enables large signal swings without clipping. The low input voltage noise ensures a clean signal path. The amplifier's high slew rate of 225 V/µs prevents distortion in fast-moving signals. With dual channels, it can implement second-order filters in a single package. The MSOP-8 package is ideal for compact filter modules.
推荐
High-Speed Data Acquisition
In high-speed data acquisition systems, the ADA4805-2ARMZ provides the necessary bandwidth and low power to condition signals before digitization. Its 105 MHz bandwidth supports sampling rates up to several MSPS. The low noise and low distortion preserve signal fidelity. The rail-to-rail output maximizes the ADC's dynamic range. The amplifier's fast settling time ensures accurate conversion in multiplexed systems. The dual-channel configuration allows simultaneous sampling of two signals. The wide supply range from ±1.5 V to ±5 V provides flexibility in system design. The MSOP-8 package is suitable for dense PCB layouts.
推荐
Test and Measurement Equipment
The ADA4805-2ARMZ is ideal for test and measurement equipment such as oscilloscopes, spectrum analyzers, and signal generators. Its 105 MHz bandwidth and 225 V/µs slew rate enable accurate reproduction of high-frequency waveforms. The low noise of 3.1 nV/√Hz ensures precise measurements. The rail-to-rail output allows full-scale signal generation. The low quiescent current reduces heat generation in benchtop instruments. The dual-channel configuration is useful for differential measurements. The wide supply range accommodates various power architectures. The MSOP-8 package is compact for multi-channel instruments.
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推荐产品汇总
工程参考数据： ADA4805-2ARMZ ——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 | ADA4805-2TRMZ-EP | ADA4805-2ARMZ-R7 | ADA4807-2ARMZ |
|---|---|---|---|---|
| Package | 8-MSOP | 8-MSOP | 8-MSOP | 8-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Bandwidth | 105 MHz | 105 MHz | 105 MHz | 220 MHz |
| Quiescent Current per Amplifier | 500 µA | 500 µA | 500 µA | 1.5 mA |
| Slew Rate | 225 V/µs | 225 V/µs | 225 V/µs | 500 V/µs |
| Input Voltage Noise | 3.1 nV/√Hz | 3.1 nV/√Hz | 3.1 nV/√Hz | 3.1 nV/√Hz |
| Supply Voltage Range | ±1.5 V to ±5 V | ±1.5 V to ±5 V | ±1.5 V to ±5 V | ±1.5 V to ±5 V |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C |
关键差异点
- Low quiescent current of 500 µA per amplifier （对比 ADA4807-2ARMZ)
- 105 MHz bandwidth with low power （对比 ADA4807-2ARMZ)
- Enhanced product version available （对比 ADA4805-2ARMZ-R7)
设计说明
The ADA4805-2ARMZ operates from ±1.5 V to ±5 V dual supplies or 3 V to 5 V single supply. Ensure that the supply voltage is within the specified range to avoid damage. Use 0.1 µF ceramic capacitors close to the V+ and V- pins for decoupling. For best performance, use a low-impedance ground plane.
The MSOP-8 package has a thermal resistance of 190°C/W. For high-power applications, ensure adequate copper area on the PCB to dissipate heat. Place the amplifier away from heat sources. Use short traces for input and output to minimize parasitic capacitance and inductance.
Avoid driving capacitive loads greater than 100 pF directly, as this may cause instability. If larger capacitive loads are required, add a series resistor at the output. Also, ensure that the input common-mode voltage does not exceed the specified range, although the device has overvoltage protection.
合规信息
RoHS compliant per distributor listings. AEC-Q100 not applicable for this industrial-grade part.
