ADA4945-1ACPZ-RL7 - Low Noise FDA ADC Driver | Analog Devices
料号： ADA4945-1ACPZ-RL7 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.88 | $388.00 |
| 500 | $3.49 | $1,745.00 |
| 1,000 | $3.1 | $3,100.00 |
ADA4945-1ACPZ-RL7 概述
A fully differential amplifier (FDA) is an amplifier with differential inputs and differential outputs, providing balanced signals that reject common-mode noise and even-order harmonics. FDAs are essential in high-speed signal chains, particularly for driving ADCs, where they convert single-ended signals to differential, provide gain, and buffer the ADC input. The ADA4945-1 fits into the hierarchy: fully differential amplifier -> differential amplifier -> operational amplifier -> analog IC -> semiconductor.
Key features include ultra-low DC offset and offset drift (0.1 µV/°C), high speed, and excellent distortion performance. The device achieves low noise and low distortion, making it ideal for data acquisition systems requiring high accuracy. The two power modes allow a trade-off between power dissipation and bandwidth, enabling efficient operation in battery-powered or high-performance systems.
Technically, the ADA4945-1 uses a precision architecture with internal common-mode feedback, ensuring accurate output common-mode voltage control. It provides a wide input common-mode range and rail-to-rail output, simplifying interface with various ADC inputs. The device also includes a disable feature for power saving, and its small package minimizes board space.
Typical applications include driving high-speed ADCs in communications, instrumentation, and medical imaging systems. It is also used in single-ended to differential conversion, level shifting, and as a buffer for precision references. The low offset drift ensures stable performance over temperature, critical for precision measurement.
When designing with the ADA4945-1, ensure proper power supply decoupling with 0.1 µF and 10 µF capacitors close to the pins. The feedback network must be carefully matched to maintain balance and minimize distortion. The device's power mode selection should be based on the required bandwidth and power budget.
直接替换替代料： ADA4945-1ACPZ-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： ADA4945-1ACPZ-RL7 （相同外形与封装尺寸） ——差异在于 Package, Power Modes.
快速对比工具——选择替代料号进行并排对比：
ADA4945-1ACPZ-R7
✅ 直接替换📋 参考替代料（不在目录中）
ADA4945-1ACPZ-RL
✅ 直接替换📋 参考替代料（不在目录中）
ADA4940-1ACPZ-R7
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADA4940-1ACPZ-RL
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADA4945-1ACPZ-RL7 最大额定值与电气特性
| Type | Fully Differential Amplifier |
| Supply Voltage Range | 3 V to 10 V |
| Offset Voltage Drift | 0.1 µV/°C |
| Power Modes | 2 (selectable) |
| 封装 | 16-LFCSP (3x3 mm) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| REACH Status | Compliant |
ADA4945-1ACPZ-RL7 引脚配置
| 引脚 1 | OUT+ — Positive differential output |
| 引脚 2 | OUT- — Negative differential output |
| 引脚 3 | VOCM — Output common-mode voltage control |
| 引脚 4 | PD — Power-down control |
| 引脚 5 | V+ — Positive supply |
| 引脚 6 | IN+ — Non-inverting input |
| 引脚 7 | IN- — Inverting input |
| 引脚 8 | V- — Negative supply |
| 引脚 9 | FB+ — Positive feedback |
| 引脚 10 | FB- — Negative feedback |
| 引脚 11 | GND — Ground |
| 引脚 12 | NC — No connect |
典型应用
ADA4945-1ACPZ-RL7 适用于 6 应用s: ADC Driver, Data Acquisition Systems, Communications Systems, Medical Imaging, Instrumentation, Test and Measurement.
ADC Driver
The ADA4945-1ACPZ-RL7 is ideal for driving high-speed ADCs. Its low noise and low distortion ensure that the ADC's performance is not degraded. The fully differential output provides balanced signals, improving common-mode rejection and reducing even-order harmonics. With a supply range of 3 V to 10 V, it can interface with various ADC supplies. The two power modes allow optimization for power-sensitive or high-performance systems. The low offset drift (0.1 µV/°C) ensures accurate conversion over temperature, making it suitable for precision data acquisition.
推荐
Data Acquisition Systems
In data acquisition systems, the ADA4945-1ACPZ-RL7 provides the necessary signal conditioning to interface sensors with ADCs. Its low offset drift and low noise ensure accurate measurement of small signals. The device operates from 3 V to 10 V, making it compatible with a wide range of system supplies. The small LFCSP package saves board space, and the two power modes allow trade-offs between power and performance. The fully differential output helps reject common-mode interference, improving system accuracy.
推荐
Communications Systems
The ADA4945-1ACPZ-RL7 is well-suited for communications systems, such as base stations and software-defined radios, where it drives ADCs in receive paths. Its low distortion and high linearity preserve signal integrity in the presence of strong interferers. The device's wide supply range (3 V to 10 V) accommodates various radio supply rails. The two power modes enable optimization for battery-operated or line-powered equipment. The compact package is ideal for dense PCB layouts in multi-channel systems.
推荐
Medical Imaging
In medical imaging systems, such as ultrasound and MRI, the ADA4945-1ACPZ-RL7 is used to condition signals from transducers before ADC conversion. Its low noise and low offset drift are critical for detecting small physiological signals. The device operates from 3 V to 10 V, compatible with medical equipment power supplies. The fully differential output reduces common-mode noise, improving image quality. The small package allows high channel density in portable devices.
推荐
Instrumentation
The ADA4945-1ACPZ-RL7 is used in precision instrumentation, such as spectrum analyzers and oscilloscopes, to drive ADCs with high accuracy. Its low offset drift (0.1 µV/°C) ensures stable measurements over temperature. The device's low noise and distortion preserve signal fidelity. The two power modes allow optimization for bench-top or portable instruments. The wide supply range (3 V to 10 V) provides flexibility in power design.
推荐
Test and Measurement
In test and measurement equipment, the ADA4945-1ACPZ-RL7 provides signal conditioning for accurate measurements. Its low noise and low distortion are essential for high-precision testing. The device's wide supply range (3 V to 10 V) and small package make it suitable for modular instruments. The two power modes allow balancing power consumption and performance. The low offset drift ensures consistent measurements across temperature variations.
推荐
推荐产品汇总
工程参考数据： ADA4945-1ACPZ-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 | ADA4945-1ACPZ-R7 | ADA4945-1ACPZ-RL | ADA4940-1ACPZ-R7 |
|---|---|---|---|---|
| Package | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| RoHS | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Ultra-low offset drift of 0.1 µV/°C （对比 ADA4940-1ACPZ-R7)
- Two selectable power modes （对比 ADA4940-1ACPZ-R7)
- Broad supply range of 3 V to 10 V （对比 ADA4940-1ACPZ-R7)
设计说明
Ensure adequate power supply decoupling. Place 0.1 µF and 10 µF capacitors close to the V+ and V- pins to minimize noise and ensure stability. The ADA4945-1 operates from 3 V to 10 V, so verify the supply rails are within this range.
For optimal performance, use a solid ground plane and keep feedback paths short. Match the feedback resistor values precisely to maintain balance and minimize distortion. The LFCSP package has an exposed pad that should be soldered to the ground plane for thermal and electrical performance.
Avoid exceeding the absolute maximum supply voltage. The power mode selection should be based on the required bandwidth and power budget. Incorrect feedback network can cause instability or increased distortion. Always refer to the datasheet for recommended component values.
合规信息
RoHS and REACH compliant per distributor data. AEC-Q100 not applicable for this non-automotive part.
