ADA4895-2ARZ-RL7 - Dual 1nV/√Hz G≥10 Stable Amp | Analog Devices
料号： ADA4895-2ARZ-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 |
ADA4895-2ARZ-RL7 概述
A voltage feedback amplifier is a type of operational amplifier where the output voltage is fed back to the inverting input to control gain. The ADA4895-2 is specifically optimized for high-speed signal conditioning, providing a small signal bandwidth of 236 MHz at a gain of +10 and a slew rate of 943 V/μs. It settles to 0.1% in 22 ns, making it ideal for applications requiring fast and accurate signal processing. The rail-to-rail output stage allows maximum output swing, which is critical for driving ADCs and other mixed-signal devices.
Key features of the ADA4895-2 include a 1/f noise of 2 nV/√Hz at 10 Hz, a spurious-free dynamic range of -72 dBc at 2 MHz, and a low input bias current of 11 µA. The amplifier is gain-of-10 stable, ensuring stability in high-gain configurations without external compensation. The low noise and high bandwidth make it an excellent choice for ultrasound, low noise preamplifiers, and drivers of high-performance ADCs.
The ADA4895-2 utilizes a complementary bipolar process, achieving a balance between speed, noise, and power consumption. The dual configuration provides two independent amplifiers in a single package, saving board space and reducing component count. The wide supply range and rail-to-rail output enhance design flexibility, allowing the amplifier to interface with various ADC and DAC voltage levels.
Typical applications include ultrasound imaging, low noise preamplifiers, ADC drivers, and active filters. The amplifier's high slew rate and fast settling time ensure accurate reproduction of high-frequency signals, while the low noise preserves signal integrity in sensitive measurement systems.
When designing with the ADA4895-2, ensure proper power supply decoupling with 0.1 µF capacitors close to the supply pins. The gain-setting resistors should be placed near the amplifier to minimize parasitic capacitance and maintain stability. The thermal resistance of the MSOP package should be considered for high-power applications, although the low quiescent current minimizes self-heating.
直接替换替代料： ADA4895-2ARZ-RL7 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
ADA4895-2ARMZ-RL
✅ 直接替换📋 参考替代料（不在目录中）
ADA4895-2ARMZ-R7
✅ 直接替换📋 参考替代料（不在目录中）
ADA4895-2ARZ-RL7 最大额定值与电气特性
| Number of Channels | 2 |
| Amplifier Type | Voltage Feedback |
| Gain Stability | G ≥ 10 stable |
| Input Voltage Noise Density | 1 nV/√Hz |
| 1/f Noise at 10 Hz | 2 nV/√Hz |
| Small Signal Bandwidth (G=+10) | 236 MHz |
| Slew Rate | 943 V/μs |
| Settling Time to 0.1% | 22 ns |
| Spurious-Free Dynamic Range | -72 dBc at 2 MHz |
| Input Bias Current | 11 µA |
| Quiescent Current per Amplifier | 3 mA |
| Supply Voltage Range | 3 V to 10 V |
| 输出类型 | Rail-to-Rail |
| 封装 | 10-MSOP |
| RoHS 状态 | Compliant |
ADA4895-2ARZ-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 |
| 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 |
| 引脚 9 | NC — No connect |
| 引脚 10 | NC — No connect |
典型应用
ADA4895-2ARZ-RL7 适用于 6 应用s: Ultrasound Imaging, Low Noise Preamplifiers, ADC Drivers, Active Filters, Test and Measurement, Communications.
Ultrasound Imaging
The ADA4895-2ARZ-RL7 is ideal for ultrasound imaging systems due to its low input noise of 1 nV/√Hz and high bandwidth of 236 MHz. In ultrasound receivers, the amplifier conditions the echo signals from piezoelectric transducers, requiring low noise to preserve weak signals and high slew rate to handle fast transients. The dual configuration allows processing of multiple channels, reducing component count. The rail-to-rail output ensures maximum dynamic range for subsequent ADC conversion. With a supply range of 3 V to 10 V, it can operate from the system's analog supply. The fast settling time of 22 ns ensures accurate signal acquisition in time-gain compensation circuits.
推荐
Low Noise Preamplifiers
The ADA4895-2ARZ-RL7 excels as a low noise preamplifier in applications such as sensor interfaces and instrumentation. Its 1 nV/√Hz input noise density minimizes signal degradation, while the gain-of-10 stability allows high gain without oscillation. The wide supply range supports various sensor biasing schemes. The dual amplifier can be used for differential or stereo signal paths, saving board space. The rail-to-rail output maximizes signal swing, and the low quiescent current of 3 mA per amplifier is ideal for battery-powered instruments. The high bandwidth ensures minimal phase shift for accurate signal reproduction.
推荐
ADC Drivers
The ADA4895-2ARZ-RL7 is well-suited for driving high-performance ADCs, such as the AD9268, due to its low noise, high bandwidth, and fast settling time. In ADC driver circuits, the amplifier buffers and scales the input signal to match the ADC's full-scale range. The rail-to-rail output ensures the ADC input is driven to its maximum range, improving dynamic range. The low distortion (-72 dBc SFDR) preserves signal fidelity. The dual configuration can drive two ADC channels or provide differential drive. The wide supply range allows interfacing with various ADC supply voltages.
推荐
Active Filters
The ADA4895-2ARZ-RL7 can be used in active filter designs, such as low-pass or high-pass filters, due to its high bandwidth and fast slew rate. In active filters, the amplifier provides gain and buffering, and its high gain-bandwidth product ensures accurate filter response at high frequencies. The low noise performance is critical for maintaining signal-to-noise ratio in the passband. The rail-to-rail output allows the filter to drive loads close to the supply rails. The dual configuration enables multi-stage filters in a single package, reducing board space. The wide supply range supports various filter topologies.
推荐
Test and Measurement
In test and measurement equipment, the ADA4895-2ARZ-RL7 provides high-speed signal conditioning with low noise and fast settling. It can be used in oscilloscope front-ends, spectrum analyzers, and data acquisition systems. The high bandwidth of 236 MHz ensures accurate reproduction of high-frequency signals, while the low noise preserves measurement accuracy. The dual configuration allows simultaneous processing of multiple channels, such as I/Q signals. The rail-to-rail output maximizes dynamic range for ADC conversion. The wide supply range and low power consumption make it suitable for portable instruments.
推荐
Communications
The ADA4895-2ARZ-RL7 is used in communications systems for IF and baseband signal conditioning. Its high bandwidth and low distortion are essential for maintaining signal integrity in modems, transceivers, and software-defined radios. The amplifier can drive ADCs in receivers or DACs in transmitters. The low noise performance improves receiver sensitivity. The dual configuration is useful for I/Q signal paths, reducing component count. The wide supply range allows operation from common 5 V or 3.3 V rails. The fast settling time supports high-speed data rates.
推荐
推荐产品汇总
工程参考数据： ADA4895-2ARZ-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 | ADA4895-2ARMZ-RL | ADA4895-2ARMZ-R7 | ADA4895-1ARZ-RL7 |
|---|---|---|---|---|
| Package | 10-MSOP | 10-MSOP | 10-MSOP | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 2 | 2 | 2 | 1 |
| Input Voltage Noise Density | 1 nV/√Hz | 1 nV/√Hz | 1 nV/√Hz | 1 nV/√Hz |
| Bandwidth (G=+10) | 236 MHz | 236 MHz | 236 MHz | 236 MHz |
| Slew Rate | 943 V/μs | 943 V/μs | 943 V/μs | 943 V/μs |
| Supply Voltage Range | 3 V to 10 V | 3 V to 10 V | 3 V to 10 V | 3 V to 10 V |
| Quiescent Current per Amplifier | 3 mA | 3 mA | 3 mA | 3 mA |
关键差异点
- Low input noise of 1 nV/√Hz （对比 ADA4897-1SRJZ-EPR7)
- Dual channel in 10-MSOP （对比 ADA4895-1ARZ-RL7)
- Gain-of-10 stable （对比 ADA4897-1SRJZ-EPR7)
设计说明
The ADA4895-2ARZ-RL7 operates from a 3 V to 10 V supply. Use low-ESR ceramic capacitors (0.1 µF) close to each supply pin to ensure stability and reduce noise. For optimal performance, a 10 µF bulk capacitor may be added at the supply entry. The low quiescent current of 3 mA per amplifier minimizes power dissipation, but ensure the supply voltage does not exceed the absolute maximum rating.
For high-speed operation, place the gain-setting resistors and feedback network as close to the amplifier as possible to minimize parasitic capacitance and inductance. Use a ground plane to provide a low-impedance return path. Keep the input traces short and shielded if necessary. The MSOP package has a thermal pad; connect it to a large copper area for heat dissipation, although the low power consumption reduces thermal concerns.
The ADA4895-2 is gain-of-10 stable; operating at lower gains may cause instability. Ensure the feedback network is designed for a closed-loop gain of at least 10. Avoid excessive capacitive loading on the output, which can cause ringing. Use a small series resistor (e.g., 50 Ω) if driving long cables or high capacitance loads. Also, ensure the input common-mode voltage is within the specified range to avoid distortion.
合规信息
RoHS compliance indicated by distributor listings. Other compliance details not specified in the provided data.
