AD7621ASTZ - 16-Bit 3 MSPS SAR ADC | Analog Devices
MPN: AD7621ASTZ ✓ Hoạt độngAD7621ASTZ Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho AD7621ASTZ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD7621ASTZ (cùng hình factor và footprint) — khác nhau ở Architecture, Resolution, RoHS Status, Analog Supply Voltage, Data Interface.
AD7621ASTZRL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7621AST
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7621ASTZ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Tỷ lệ lấy mẫu | 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 (Bất định tích hợp) | 2 LSB |
| Hộp | 48-LQFP (7x7 mm) |
| Khoảng nhiệt độ hoạt động | -40°C to +85°C |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| REACH Status | Compliant |
Cấu hình chân AD7621ASTZ
| Chân 1 | AVDD — Analog power supply |
| Chân 2 | IN+ — Positive analog input |
| Chân 3 | IN- — Negative analog input |
| Chân 4 | REF — Reference voltage input |
| Chân 5 | REFGND — Reference ground |
| Chân 6 | AGND — Analog ground |
| Chân 7 | DVDD — Digital power supply |
| Chân 8 | DGND — Digital ground |
| Chân 9 | SDO — Serial data output |
| Chân 10 | SCLK — Serial clock input |
| Chân 11 | CS — Chip select |
| Chân 12 | BUSY — Busy output |
Ứng dụng tiêu biểu
AD7621ASTZ phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7621ASTZ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- High speed with 16-bit resolution (vsAD7980BRMZ)
- Fully differential input (vsAD7091R-2BRUZ)
- Lower power consumption (vsAD7606BSTZ)
Ghi chú thiết kế
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).
Thông tin tuân thủ
RoHS and REACH compliant per distributor data. Not AEC-Q100 qualified.
