AD7621ASTZ - 16-Bit 3 MSPS SAR ADC | Analog Devices
料号： AD7621ASTZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $24.5 | $24.50 |
| 10 | $22.1 | $221.00 |
| 100 | $19.8 | $1,980.00 |
| 500 | $17.5 | $8,750.00 |
| 1,000 | $15.9 | $15,900.00 |
AD7621ASTZ 概述
An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital values. The AD7621ASTZ belongs to the SAR ADC family, which uses a binary search algorithm to approximate the input voltage. SAR ADCs are known for their high speed, low power consumption, and excellent accuracy, making them ideal for applications requiring precise measurements at moderate sampling rates. The AD7621ASTZ is part of the PulSAR series, which is recognized for its high performance and reliability.
Key features of the AD7621ASTZ include 16-bit resolution with 2 LSB integral nonlinearity (INL), a maximum sampling rate of 3 MSPS, and a fully differential input range of ±VREF. The device operates from a single 2.5 V supply, with an analog supply range of 2.37 V to 2.63 V, and features a serial and parallel interface for flexible data transfer. The internal conversion clock eliminates the need for an external clock, simplifying system design.
The AD7621ASTZ uses a charge redistribution architecture that provides excellent linearity and low noise. The device includes an internal reference buffer, which reduces external component count and improves performance. The fully differential input allows for common-mode rejection, making it suitable for applications with noisy environments. The device also features a power-down mode to reduce power consumption when not converting.
Typical applications for the AD7621ASTZ include medical imaging, high-speed data acquisition, industrial process control, and instrumentation. Its high speed and accuracy make it ideal for applications such as digital X-ray, ultrasound, and vibration analysis. The device's small package and low power consumption enable portable and battery-powered designs.
When designing with the AD7621ASTZ, it is important to provide a clean, low-noise power supply and a stable reference voltage. The analog input should be driven with a low-impedance source to maintain accuracy. Proper decoupling of the power supply pins and careful PCB layout are essential to achieve the specified performance.
直接替换替代料： AD7621ASTZ ——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： AD7621ASTZ （相同外形与封装尺寸） ——差异在于 Architecture, Resolution, RoHS Status, Analog Supply Voltage, Data Interface.
快速对比工具——选择替代料号进行并排对比：
AD7621ASTZRL
✅ 直接替换📋 参考替代料（不在目录中）
AD7621AST
✅ 直接替换📋 参考替代料（不在目录中）
AD7621ASTZ 最大额定值与电气特性
| 分辨率 | 16 bits |
| 采样率 | 3 MSPS |
| Number of Inputs | 1 |
| Input Type | Fully Differential |
| Data Interface | Serial, Parallel |
| Architecture | SAR |
| Reference Type | External, Internal |
| Analog Supply Voltage | 2.37 V to 2.63 V |
| Digital Supply Voltage | 2.37 V to 2.63 V |
| INL（积分非线性） | 2 LSB |
| 封装 | 48-LQFP (7x7 mm) |
| 工作温度范围 | -40°C to +85°C |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| REACH Status | Compliant |
AD7621ASTZ 引脚配置
| 引脚 1 | AVDD — Analog power supply |
| 引脚 2 | IN+ — Positive analog input |
| 引脚 3 | IN- — Negative analog input |
| 引脚 4 | REF — Reference voltage input |
| 引脚 5 | REFGND — Reference ground |
| 引脚 6 | AGND — Analog ground |
| 引脚 7 | DVDD — Digital power supply |
| 引脚 8 | DGND — Digital ground |
| 引脚 9 | SDO — Serial data output |
| 引脚 10 | SCLK — Serial clock input |
| 引脚 11 | CS — Chip select |
| 引脚 12 | BUSY — Busy output |
典型应用
AD7621ASTZ 适用于 6 应用s: Medical Imaging, High-Speed Data Acquisition, Industrial Process Control, Instrumentation, Vibration Analysis, Portable Instrumentation.
Medical Imaging
The AD7621ASTZ's 16-bit resolution and 3 MSPS sampling rate enable high-quality digital X-ray and ultrasound imaging. Its low noise and high linearity ensure accurate image reconstruction, while the small LQFP package allows compact system design. The fully differential input rejects common-mode interference, improving signal integrity in medical environments.
推荐
High-Speed Data Acquisition
With 3 MSPS throughput and 16-bit accuracy, the AD7621ASTZ is ideal for high-speed data acquisition systems in test and measurement equipment. It captures fast transient signals with high fidelity, and its serial interface simplifies connection to DSPs and FPGAs. The internal conversion clock reduces external timing complexity, enabling faster system integration.
推荐
Industrial Process Control
The AD7621ASTZ provides precise analog-to-digital conversion for industrial process control loops, such as motor control and temperature monitoring. Its wide operating temperature range (-40°C to +85°C) ensures reliable operation in harsh factory environments. The device's high INL performance (2 LSB) guarantees accurate measurement of process variables, improving system efficiency and safety.
推荐
Instrumentation
In precision instrumentation, the AD7621ASTZ offers the speed and accuracy needed for spectrum analyzers, oscilloscopes, and data loggers. Its 16-bit resolution and 3 MSPS sampling rate allow capturing high-frequency signals with fine detail. The fully differential input reduces noise pickup, making it suitable for sensitive measurements in laboratory equipment.
推荐
Vibration Analysis
The AD7621ASTZ is well-suited for vibration analysis in predictive maintenance systems. Its high sampling rate captures high-frequency vibration signals, while the 16-bit resolution provides fine amplitude resolution for detecting early signs of equipment failure. The low power consumption enables battery-powered wireless sensor nodes for remote monitoring.
推荐
Portable Instrumentation
The AD7621ASTZ's low power consumption (45 mW at 3 MSPS) and small package make it ideal for portable instrumentation such as handheld multimeters and portable data loggers. Its power-down mode reduces consumption to less than 1 mW, extending battery life. The serial interface minimizes pin count, simplifying PCB design for compact devices.
推荐
推荐产品汇总
工程参考数据： AD7621ASTZ ——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 | AD7621ASTZRL | AD7621ACPZ | AD7621AST |
|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) - same | 48-LFCSP (7x7 mm) - different | 48-LQFP (7x7 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 3 MSPS | 3 MSPS | 3 MSPS | 3 MSPS |
| Input Type | Fully Differential | Fully Differential | Fully Differential | Fully Differential |
| INL | 2 LSB | 2 LSB | 2 LSB | 2 LSB |
| Supply Voltage | 2.5 V (2.37-2.63 V) | 2.5 V (2.37-2.63 V) | 2.5 V (2.37-2.63 V) | 2.5 V (2.37-2.63 V) |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
关键差异点
- High speed with 16-bit resolution （对比 AD7980BRMZ)
- Fully differential input （对比 AD7091R-2BRUZ)
- Lower power consumption （对比 AD7606BSTZ)
设计说明
Provide a clean, low-noise 2.5 V supply for AVDD and DVDD. Use a low-dropout regulator (LDO) with output noise below 10 µVrms to avoid degrading ADC performance. Decouple each supply pin with a 10 µF ceramic capacitor and a 0.1 µF capacitor placed as close to the pin as possible.
For optimal performance, use a solid ground plane and separate analog and digital ground areas, connecting them at a single point. Route analog input traces away from digital signals to minimize coupling. Place the reference decoupling capacitor (10 µF) close to the REF pin and connect REFGND directly to the analog ground plane.
Ensure the analog input source impedance is low (below 100 Ω) to avoid sampling errors. Use a driver amplifier with sufficient bandwidth and low output impedance. Avoid exceeding the absolute maximum ratings on the input pins, and ensure the reference voltage is stable and within the specified range (2.4 V to 2.6 V).
合规信息
RoHS and REACH compliant per distributor data. Not AEC-Q100 qualified.
