ADA4941-1ARZ - 18-Bit Differential ADC Driver | Analog Devices
料号： ADA4941-1ARZ ✓ 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 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 class of differential amplifiers, which are essential building blocks in signal chains for precision measurement, medical imaging, and communications. By providing a balanced output, it enables the full-scale input range of the ADC to be utilized, enhancing the signal-to-noise ratio (SNR) and reducing even-order harmonics.
Key features include ultralow distortion of 120 dBc THD at 10 kHz, low noise achieving 97 dB SNR at 100 kHz with 4 V p-p output, and extremely low power consumption on a 3 V supply. The device operates from a single supply, simplifying power design. It offers high input impedance, which minimizes loading on the preceding stage. The ADA4941-1 is available in an 8-lead SOIC package (ARZ suffix), suitable for space-constrained applications.
Technically, the ADA4941-1 uses a differential architecture with an internal common-mode feedback loop that sets the output common-mode voltage to a reference level, typically mid-supply. This allows direct coupling to ADCs with a specified common-mode input range. The XFCB process provides high-speed complementary bipolar transistors with excellent matching, contributing to the low distortion and noise performance. The device is stable with capacitive loads, simplifying PCB layout.
Typical applications include driving 16-bit and 18-bit PulSAR ADCs such as the AD7687, AD7690, and AD7691. It is also used in industrial process control, medical instrumentation, and communications systems where high resolution and low power are critical. The single-ended-to-differential conversion capability makes it versatile for interfacing sensors and transducers to differential ADCs.
When designing with the ADA4941-1, ensure proper supply decoupling with 0.1 uF and 10 uF capacitors close to the VCC and VEE pins. The output common-mode voltage can be adjusted via the VOCM pin to match the ADC input range. For optimal performance, use precision resistors with low temperature coefficient for the gain-setting network.
直接替换替代料： ADA4941-1ARZ ——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 （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature Range, Input Impedance, Output Type, Process Technology.
快速对比工具——选择替代料号进行并排对比：
ADA4941-1YRZ
✅ 直接替换📋 参考替代料（不在目录中）
ADA4940-1ARZ
⚡ 相同封装📋 参考替代料（不在目录中）
ADA4940-1ARZ-R7
⚡ 相同封装📋 参考替代料（不在目录中）
ADA4895-1ARZ
⚡ 相同封装 ⚠️ 规格未核验✓ 有现货
$2.19 / 个
查看数据手册 →ADA4941-1ARZ 最大额定值与电气特性
| Type | Differential ADC Driver |
| Configuration | Single-ended to differential, G = +2 |
| 电源电压 | 3 V to 5 V (single supply) |
| 静态电流 | 1.25 mA (typical) |
| THD | 120 dBc at 10 kHz |
| SNR | 97 dB at 100 kHz, 4 V p-p |
| Input Impedance | High (typical) |
| Output Common-Mode Range | Adjustable via VOCM pin |
| 封装 | 8-Lead SOIC (ARZ) |
| 工作温度范围 | -40°C to +125°C |
| RoHS Compliant | Yes |
| Process Technology | XFCB (eXtra fast complementary bipolar) |
ADA4941-1ARZ 引脚配置
| 引脚 1 | VOCM — Output common-mode voltage set point |
| 引脚 2 | VIN- — Inverting input |
| 引脚 3 | VIN+ — Non-inverting input |
| 引脚 4 | VEE — Negative supply (ground for single supply) |
| 引脚 5 | VOUT- — Inverting output |
| 引脚 6 | VOUT+ — Non-inverting output |
| 引脚 7 | VCC — Positive supply |
| 引脚 8 | NC — No connect |
典型应用
ADA4941-1ARZ 适用于 6 应用s: Driving 16-bit and 18-bit PulSAR ADCs, Industrial Process Control, Medical Instrumentation, Communications Systems, Test and Measurement Equipment, Portable and Battery-Powered Devices.
Driving 16-bit and 18-bit PulSAR ADCs
The ADA4941-1ARZ is specifically designed to drive high-resolution SAR ADCs such as the AD7687, AD7690, and AD7691. Its low noise and distortion ensure that the ADC's performance is not degraded. The single-ended to differential conversion allows direct interface with differential inputs, maximizing dynamic range. With a gain of +2, it provides the required signal swing for full-scale ADC input. The low power consumption makes it suitable for battery-powered data acquisition systems.
推荐
Industrial Process Control
In industrial process control, precise measurement of sensor signals is critical. The ADA4941-1ARZ converts single-ended sensor outputs to differential signals for high-resolution ADCs, improving noise immunity in noisy industrial environments. Its low power and small SOIC package make it ideal for distributed control modules. The high input impedance minimizes loading on sensors, preserving signal integrity. The device's wide temperature range (-40°C to +125°C) ensures reliable operation in harsh conditions.
推荐
Medical Instrumentation
Medical devices such as patient monitors and diagnostic equipment require high accuracy and low noise. The ADA4941-1ARZ provides the necessary signal conditioning for biopotential and imaging sensors, converting single-ended signals to differential for high-resolution ADCs. Its low power consumption extends battery life in portable devices. The ultralow distortion ensures faithful reproduction of physiological signals. The device's small footprint allows for compact medical device designs.
推荐
Communications Systems
In communications systems, the ADA4941-1ARZ is used to interface analog baseband signals to high-speed ADCs in receivers. Its differential output reduces common-mode noise and improves dynamic range, essential for maintaining signal integrity in RF and IF chains. The device's low distortion is critical for minimizing intermodulation products. With a 3 V supply, it is compatible with low-voltage digital signal processors. The high input impedance allows direct connection to filters and mixers.
推荐
Test and Measurement Equipment
The ADA4941-1ARZ is ideal for test and measurement equipment such as data acquisition cards and spectrum analyzers. Its high SNR and low distortion ensure accurate signal analysis. The single-ended to differential conversion simplifies interfacing with various sensors and signal sources. The device's low power consumption is beneficial for multi-channel systems. The SOIC package is easy to integrate into existing PCB designs.
推荐
Portable and Battery-Powered Devices
For portable devices, power efficiency is paramount. The ADA4941-1ARZ operates from a 3 V supply and draws only 1.25 mA quiescent current, making it ideal for battery-powered applications. Its low noise and distortion ensure high-quality signal processing in audio and sensor applications. The small SOIC package saves board space. The device's wide temperature range allows use in outdoor and automotive environments.
推荐
推荐产品汇总
工程参考数据： ADA4941-1ARZ ——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 | ADA4940-1ARZ | ADA4895-1ARZ |
|---|---|---|---|---|
| Package | 8-Lead SOIC | 8-Lead SOIC | 8-Lead SOIC | 8-Lead SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Configuration | Single-ended to differential, G=+2 | Single-ended to differential, G=+2 | Fully differential, adjustable gain | Single-ended op amp |
| Supply Voltage | 3 V to 5 V | 3 V to 5 V | 3 V to 5 V | 2.7 V to 12 V |
| Quiescent Current | 1.25 mA | 1.25 mA | 1.25 mA | 2.3 mA |
| THD at 10 kHz | 120 dBc | 120 dBc | 120 dBc | 100 dBc |
| SNR at 100 kHz | 97 dB | 97 dB | 97 dB | 90 dB |
| Output Type | Differential | Differential | Differential | Single-ended |
关键差异点
- Fixed gain of +2 simplifies design （对比 ADA4940-1ARZ)
- Optimized for single-ended sources （对比 ADA4940-1ARZ)
- Lower quiescent current than ADA4895-1 （对比 ADA4895-1ARZ)
设计说明
The ADA4941-1ARZ operates from a single 3 V to 5 V supply. Use a low-noise LDO regulator to supply VCC and VEE (ground) to minimize power supply noise. Place 0.1 uF and 10 uF decoupling capacitors close to the VCC and VEE pins. For best performance, keep the analog supply separate from digital supplies to avoid coupling noise.
For optimal noise performance, use a solid ground plane and minimize trace lengths. Place the ADA4941-1 close to the ADC to reduce parasitic capacitance and inductance. Use precision resistors (0.1% tolerance) for the gain-setting network to maintain accuracy. Ensure the feedback network is symmetrical to preserve balance.
Do not exceed the absolute maximum supply voltage of 5.5 V. The VOCM pin should be bypassed with a 0.1 uF capacitor to ground to set the output common-mode voltage. Avoid driving capacitive loads greater than 100 pF without a series resistor, as this may cause instability. Always refer to the datasheet for the recommended application circuit.
合规信息
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
