ADA4941-1ARZ-RL7 - Differential ADC Driver | Analog Devices
料号： ADA4941-1ARZ-RL7 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.24 | $1,620.00 |
| 1,000 | $2.88 | $2,880.00 |
ADA4941-1ARZ-RL7 概述
A differential ADC driver is an amplifier that converts a single-ended input signal into a differential output, which is required by many high-performance ADCs to improve noise immunity and dynamic range. The ADA4941-1 belongs to the category of differential amplifiers, which are a subset of operational amplifiers used in signal conditioning chains. These amplifiers are essential in precision data acquisition systems where the ADC's performance depends on the quality of the driving signal.
Key features of the ADA4941-1 include ultralow distortion of 120 dBc THD at 10 kHz, low noise enabling 97 dB SNR at 100 kHz with a 4 V p-p output, and extremely low power consumption on a 3 V supply. The device operates from a single supply, simplifying power supply design. Its high input impedance minimizes loading on the source, and the differential output provides the balanced drive required by modern ADCs.
Technically, the ADA4941-1 uses a single-ended to differential conversion with a fixed gain of +2, eliminating the need for external gain-setting resistors. The output common-mode voltage is set by an internal reference, ensuring proper ADC input range. The XFCB process provides high speed and low distortion while maintaining low power, making it suitable for battery-powered and portable instrumentation.
Typical applications include driving 16-bit and 18-bit SAR ADCs in medical imaging, industrial process control, and precision data acquisition systems. The device is also used in communication systems where high dynamic range is required. Its low power consumption makes it ideal for portable and battery-operated equipment.
When designing with the ADA4941-1, ensure that the input signal is within the common-mode input range and that the output is properly filtered to avoid aliasing. The device is available in an 8-lead SOIC package, and the RL7 suffix indicates tape and reel packaging for automated assembly.
直接替换替代料： ADA4941-1ARZ-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： ADA4941-1ARZ-RL7 （相同外形与封装尺寸） ——差异在于 Input Impedance, Package.
快速对比工具——选择替代料号进行并排对比：
ADA4941-1YRZ-R7
✅ 直接替换📋 参考替代料（不在目录中）
ADA4941-1ARZ
✅ 直接替换✓ 有现货
$2.88 / 个
查看数据手册 →ADA4940-1ARZ
⚡ 相同封装📋 参考替代料（不在目录中）
THS4521
⚡ 相同封装 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LTC6363HMS8-2#PBF
⚡ 相同封装 ⚠️ 规格未核验✓ 有现货
$3.75 / 个
查看数据手册 →ADA4941-1ARZ-RL7 最大额定值与电气特性
| Type | Differential ADC Driver |
| Number of Channels | 1 |
| Gain | +2 (fixed) |
| 电源电压 | 3 V to 5 V (single supply) |
| 电源电流 | 1.25 mA (typical) |
| THD | 120 dBc at 10 kHz |
| SNR | 97 dB at 100 kHz, 4 V p-p |
| Input Impedance | High |
| 输出类型 | Differential |
| 封装 | 8-Lead SOIC (SOIC-8) |
| 工作温度范围 | -40°C to +125°C |
| RoHS | Compliant |
| REACH | Compliant |
| 安装类型 | Surface Mount |
| Packaging | Tape & Reel (RL7) |
ADA4941-1ARZ-RL7 引脚配置
| 引脚 1 | OUT+ — Positive differential output |
| 引脚 2 | V- — Negative supply (ground in single-supply operation) |
| 引脚 3 | IN- — Inverting input (connected to ground for gain +2) |
| 引脚 4 | IN+ — Non-inverting input (signal input) |
| 引脚 5 | V+ — Positive supply |
| 引脚 6 | OUT- — Negative differential output |
| 引脚 7 | VOCM — Output common-mode voltage (typically left floating or connected to reference) |
| 引脚 8 | NC — No connect |
典型应用
ADA4941-1ARZ-RL7 适用于 6 应用s: Driving 16-bit and 18-bit SAR ADCs, Medical Imaging Systems, Industrial Process Control, Portable Instrumentation, Communication Systems, Test and Measurement Equipment.
Driving 16-bit and 18-bit SAR ADCs
The ADA4941-1ARZ-RL7 is specifically optimized to drive high-resolution SAR ADCs such as the AD7687, AD7690, and AD7691. Its low noise (97 dB SNR) and low distortion (120 dBc THD) ensure that the ADC's performance is not degraded. The fixed gain of +2 simplifies the interface, and the differential output provides the balanced drive required by these ADCs. This application is critical in precision data acquisition systems where signal integrity is paramount.
推荐
Medical Imaging Systems
In medical imaging equipment such as ultrasound and MRI, high-resolution ADCs are used to digitize analog signals. The ADA4941-1ARZ-RL7 provides the low noise and low distortion necessary to preserve image quality. Its low power consumption (1.25 mA) is beneficial for portable or battery-powered medical devices. The single-supply operation simplifies power supply design, and the small SOIC package saves board space.
推荐
Industrial Process Control
Industrial process control systems require accurate measurement of sensors and transducers. The ADA4941-1ARZ-RL7 drives the ADC that digitizes these signals, ensuring high fidelity. Its wide supply voltage range (3 V to 5 V) allows operation from common industrial power rails. The device's robustness over -40°C to +125°C makes it suitable for harsh industrial environments.
推荐
Portable Instrumentation
Portable instruments such as handheld multimeters and data loggers benefit from the ADA4941-1ARZ-RL7's low power consumption and small footprint. The device operates from a 3 V supply, making it compatible with battery-powered systems. Its high input impedance minimizes loading on the sensor, and the differential output improves noise immunity in electrically noisy environments.
推荐
Communication Systems
In communication systems, the ADA4941-1ARZ-RL7 can be used to drive ADCs in receivers and base stations. Its high dynamic range (97 dB SNR) is essential for handling weak signals in the presence of strong interferers. The low distortion ensures that the signal is not corrupted, maintaining the integrity of the communication link. The device's low power is advantageous in remote or battery-powered communication nodes.
推荐
Test and Measurement Equipment
Test and measurement equipment such as oscilloscopes and spectrum analyzers require high-speed, high-resolution ADCs. The ADA4941-1ARZ-RL7 provides the necessary drive with low noise and distortion, ensuring accurate measurements. Its single-ended to differential conversion is ideal for interfacing with various signal sources. The device's wide temperature range and reliability make it suitable for professional test equipment.
推荐
推荐产品汇总
工程参考数据： ADA4941-1ARZ-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 | ADA4941-1YRZ-R7 | ADA4941-1ARZ | ADA4940-1ARZ | THS4521 |
|---|---|---|---|---|---|
| Package | 8-Lead SOIC | 8-Lead SOIC | 8-Lead SOIC | 8-Lead SOIC | 8-Lead SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Gain Configuration | Fixed +2 | Fixed +2 | Fixed +2 | Adjustable | Adjustable |
| Input Type | Single-ended | Single-ended | Single-ended | Differential | Differential |
| Supply Voltage Range | 3 V to 5 V | 3 V to 5 V | 3 V to 5 V | 2.7 V to 7 V | 2.7 V to 5.5 V |
| Supply Current | 1.25 mA | 1.25 mA | 1.25 mA | 1.25 mA | 1.1 mA |
| THD at 10 kHz | 120 dBc | 120 dBc | 120 dBc | 120 dBc | 120 dBc |
| SNR at 100 kHz | 97 dB | 97 dB | 97 dB | 97 dB | 95 dB |
关键差异点
- Fixed gain of +2 simplifies design （对比 ADA4940-1ARZ)
- Single-ended to differential conversion （对比 THS4521)
- Optimized for PulSAR ADCs （对比 LTC6363)
设计说明
The ADA4941-1ARZ-RL7 operates from a single 3 V to 5 V supply. Ensure that the supply is well decoupled with a 0.1 µF ceramic capacitor placed close to the V+ pin. The low quiescent current of 1.25 mA makes it suitable for battery-powered applications, but the supply voltage must remain within the specified range to maintain performance.
For optimal performance, place the ADA4941-1ARZ-RL7 close to the ADC it drives to minimize trace length and parasitic capacitance. Use a solid ground plane and avoid routing high-speed digital signals near the analog input and output traces. The differential output traces should be routed as a pair with controlled impedance to maintain signal integrity.
A common mistake is to leave the VOCM pin unconnected when the ADC requires a specific common-mode voltage. The VOCM pin can be driven by a reference voltage to set the output common-mode level. Additionally, ensure that the input signal is within the common-mode input range of the amplifier to avoid clipping. Refer to the datasheet for the recommended input and output voltage ranges.
合规信息
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified.
