ADA4940-1ACPZ-RL7 - Ultralow Power Differential ADC Driver | ADI
料号： ADA4940-1ACPZ-RL7 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.33 | $6.33 |
| 10 | $5.82 | $58.20 |
| 100 | $5.12 | $512.00 |
| 500 | $4.61 | $2,305.00 |
| 1,000 | $4.1 | $4,100.00 |
ADA4940-1ACPZ-RL7 概述
A fully differential amplifier (FDA) is an amplifier that converts a single-ended input signal into a differential output, or amplifies a differential input while rejecting common-mode noise. It is a critical building block in precision data acquisition systems, providing the balanced drive required by high-resolution ADCs. The ADA4940-1 belongs to the family of differential amplifiers, which are a subset of operational amplifiers used specifically for driving ADCs and transmitting signals over long lines.
Key features include ultralow power consumption of 1.25 mA quiescent current, low noise and distortion, and an adjustable output common-mode voltage. The device supports a wide supply range and provides excellent AC performance, making it suitable for applications from DC to 1 MHz. The ADA4940-1 is optimized for driving the PULSAR family of ADCs from Analog Devices, ensuring seamless integration.
Technically, the ADA4940-1 employs a precision architecture that maintains low offset and high linearity. The adjustable common-mode output allows direct interface to ADC inputs, eliminating the need for external level shifting. The device also features a power-down mode to conserve energy in battery-powered systems. Its low power consumption does not compromise performance, making it a standout choice for portable instrumentation.
Typical applications include driving SAR ADCs in medical imaging, industrial process control, and portable battery-powered devices. The ADA4940-1 is also used in communication systems where signal integrity is paramount. Its low power and small footprint make it ideal for multi-channel data acquisition systems.
When designing with this device, ensure proper decoupling of the power supply pins and careful layout of the differential traces to minimize parasitic capacitance. The output common-mode voltage should be set to match the ADC's input range for optimal performance.
直接替换替代料： ADA4940-1ACPZ-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： ADA4940-1ACPZ-RL7 （相同外形与封装尺寸） ——差异在于 Output Type.
快速对比工具——选择替代料号进行并排对比：
ADA4940-1ACPZ-R7
✅ 直接替换📋 参考替代料（不在目录中）
ADA4940-1ACPZ-RL
✅ 直接替换📋 参考替代料（不在目录中）
ADA4940-1ACPZ
✅ 直接替换✓ 有现货
$3.92 / 个
查看数据手册 →ADA4945-1ACPZ-R2
✅ 直接替换📋 参考替代料（不在目录中）
ADA4940-1ACPZ-RL7 最大额定值与电气特性
| Amplifier Type | Differential |
| Number of Circuits | 1 |
| 输出类型 | Differential |
| Current - Supply | 1.25 mA |
| 封装 / 外壳 | 16-LFCSP-VQ (3x3) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
ADA4940-1ACPZ-RL7 引脚配置
| 引脚 1 | OUT+ — Positive differential output |
| 引脚 2 | VOCM — Output common-mode voltage control |
| 引脚 3 | V- — Negative supply voltage |
| 引脚 4 | IN- — Inverting input |
| 引脚 5 | IN+ — Non-inverting input |
| 引脚 6 | V+ — Positive supply voltage |
| 引脚 7 | PD — Power-down control |
| 引脚 8 | OUT- — Negative differential output |
| 引脚 9 | EP — Exposed pad, connect to ground |
典型应用
ADA4940-1ACPZ-RL7 适用于 6 应用s: SAR ADC Driver, Sigma-Delta ADC Driver, Portable Medical Devices, Industrial Process Control, Communication Systems, Battery-Powered Instrumentation.
SAR ADC Driver
The ADA4940-1ACPZ-RL7 is ideal for driving SAR ADCs with resolutions up to 18 bits. Its low noise and distortion ensure accurate conversion, while its 1.25 mA quiescent current minimizes power consumption in battery-powered systems. The adjustable output common-mode voltage allows direct interface to the ADC input range, simplifying the design. With a bandwidth of DC to 1 MHz, it supports a wide range of signal frequencies. The small 3x3 mm LFCSP package saves board space in multi-channel data acquisition systems.
推荐
Sigma-Delta ADC Driver
For sigma-delta ADCs, the ADA4940-1ACPZ-RL7 provides the low noise and low distortion needed to preserve signal integrity. Its ultralow power consumption is beneficial in portable instruments where battery life is critical. The device's adjustable common-mode output ensures proper biasing of the ADC input, reducing external components. The wide bandwidth supports high-frequency signals up to 1 MHz, making it suitable for audio and vibration analysis. The compact package enables dense PCB layouts in multi-channel systems.
推荐
Portable Medical Devices
In portable medical devices like patient monitors and glucose meters, the ADA4940-1ACPZ-RL7's low power consumption extends battery life. Its low noise is critical for accurate biopotential measurements. The small package allows for miniaturization of the device. The amplifier's ability to drive high-resolution ADCs ensures precise data acquisition. The adjustable common-mode voltage simplifies interfacing with various sensor outputs.
推荐
Industrial Process Control
The ADA4940-1ACPZ-RL7 is well-suited for industrial process control systems that require high accuracy and low power. It can drive ADCs that monitor temperature, pressure, and flow with 18-bit resolution. Its low distortion ensures faithful reproduction of sensor signals. The wide supply voltage range accommodates industrial power rails. The compact package is ideal for space-constrained control modules.
推荐
Communication Systems
In communication systems, the ADA4940-1ACPZ-RL7 provides the low noise and high linearity needed for driving ADCs in receivers. Its low power consumption is beneficial in battery-operated communication devices. The differential output helps reject common-mode interference, improving signal quality. The small package allows for high-density integration in RF front-ends. The adjustable common-mode voltage facilitates interfacing with various ADC input stages.
推荐
Battery-Powered Instrumentation
The ADA4940-1ACPZ-RL7 is perfect for battery-powered instrumentation where power efficiency is paramount. Its 1.25 mA quiescent current is among the lowest in its class. It can drive high-resolution ADCs for data loggers and handheld meters. The low noise ensures accurate measurements even with small signals. The compact package is ideal for portable devices.
推荐
推荐产品汇总
工程参考数据： ADA4940-1ACPZ-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 | ADA4940-1ACPZ-R7 | ADA4940-1ACPZ-RL | ADA4945-1ACPZ-R2 |
|---|---|---|---|---|
| Package | 16-LFCSP-VQ (3x3) | 16-LFCSP-VQ (3x3) | 16-LFCSP-VQ (3x3) | 16-LFCSP-VQ (3x3) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Noise | Low | Low | Low | Low |
| Distortion | Low | Low | Low | Low |
| Output Common-Mode Adjustable | Yes | Yes | Yes | Yes |
关键差异点
- Ultralow power consumption （对比 ADA4945-1ACPZ-R2)
- Pin-to-pin compatibility with ADA4945-1 （对比 ADA4945-1ACPZ-R2)
- Optimized for PULSAR ADCs （对比 Generic differential amplifiers)
设计说明
For optimal performance, place decoupling capacitors (0.1 uF and 10 uF) close to the V+ and V- pins. Use a solid ground plane and minimize trace lengths for the differential outputs. The exposed pad (EP) should be soldered to the ground plane for thermal and electrical stability.
Keep the differential input and output traces symmetrical and closely coupled to minimize common-mode noise. Avoid routing high-speed digital signals near the amplifier. Use ground fills around the amplifier to reduce parasitic capacitance.
Do not drive a purely capacitive load directly, as it can cause ringing and instability due to bond wire inductance. Use a small series resistor (e.g., 10-50 ohms) if a capacitive load is unavoidable. Also, ensure the VOCM pin is properly driven to set the output common-mode voltage within the ADC's input range.
合规信息
RoHS compliant per distributor listings. No AEC-Q100 qualification indicated.
