AD7944BCPZ - 14-Bit 2.5 MSPS PulSAR ADC | Analog Devices
MPN: AD7944BCPZ ✓ Hoạt độngAD7944BCPZ Tóm tắt
A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm to convert an analog input into a digital output. It typically offers high speed and low power consumption, making it suitable for applications such as data acquisition, industrial process control, and medical instrumentation. The AD7944 is a high-performance member of this family, providing 14-bit resolution at 2.5 MSPS while dissipating only 15.5 mW, which is ideal for power-sensitive portable and battery-powered systems.
Key features of the AD7944 include a 14-bit resolution, 2.5 MSPS throughput, and a serial interface that is compatible with 1.8 V, 2.5 V, and 2.7 V supplies via the separate VIO supply. The device also offers a pseudo-differential input, an internal reference buffer, and a power-down mode to reduce power consumption when not converting. The LFCSP package provides a compact footprint for space-constrained designs.
Technically, the AD7944 uses a charge redistribution SAR architecture with a capacitive DAC, achieving excellent linearity and low noise. The device includes an internal reference buffer that allows the use of an external reference, and it supports both SPI and daisy-chain modes for easy integration with microcontrollers and DSPs. The pseudo-differential input simplifies signal conditioning while maintaining good common-mode rejection.
Typical applications for the AD7944 include high-speed data acquisition systems, industrial process control, medical imaging, and portable instrumentation. Its combination of speed, resolution, and low power makes it suitable for battery-powered devices where power efficiency is critical. The device is also used in communication systems for digitizing analog signals with high accuracy.
When designing with the AD7944, ensure that the reference voltage is stable and well-decoupled, as it directly affects conversion accuracy. The VIO supply should be matched to the host interface logic level to avoid signal integrity issues. Proper PCB layout with separate analog and digital ground planes is recommended to minimize noise coupling.
Bộ thay thế dễ dàng lắp đặt cho AD7944BCPZ — 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 AD7944BCPZ (cùng hình factor và footprint) — khác nhau ở Resolution, Package, Sampling Rate, Data Interface, Supply Voltage.
AD7944BCPZ-RL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7942BCPZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7946BCPZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7980BCPZ-RL7
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7690BCPZRL7
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7944BCPZ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 14 Bit |
| Tỷ lệ lấy mẫu | 2.5 MSPS |
| Number of Inputs | 1 |
| Input Type | Pseudo-Differential |
| Data Interface | SPI, DSP |
| Architecture | SAR |
| Supply Voltage - Analog | 2.5 V |
| Supply Voltage - Digital | 1.8 V to 2.7 V (VIO) |
| Power Dissipation | 15.5 mW |
| Khoảng nhiệt độ hoạt động | -40°C to +85°C |
| Hộp | 20-LFCSP (4x4 mm) |
| Kiểu lắp đặt | Surface Mount |
| Reference Type | External |
Cấu hình chân AD7944BCPZ
| Chân 1 | REF — Reference input |
| Chân 2 | IN+ — Positive analog input |
| Chân 3 | IN- — Negative analog input |
| Chân 4 | GND — Ground |
| Chân 5 | VIO — Digital interface supply |
| Chân 6 | SCK — Serial clock input |
| Chân 7 | SDI — Serial data input |
| Chân 8 | SDO — Serial data output |
| Chân 9 | CNV — Convert input |
| Chân 10 | VDD — Analog supply |
| Chân 11 | GND — Ground |
| Chân 12 | GND — Ground |
Ứng dụng tiêu biểu
AD7944BCPZ phù hợp cho 6 Áp dụngs: High-Speed Data Acquisition, Industrial Process Control, Medical Instrumentation, Portable Instrumentation, Communication Systems, Test and Measurement.
High-Speed Data Acquisition
The AD7944BCPZ's 2.5 MSPS sampling rate and 14-bit resolution make it ideal for high-speed data acquisition systems. It digitizes fast-changing signals with high accuracy, enabling precise measurement in applications like vibration analysis and transient capture. The low power consumption of 15.5 mW allows for portable and battery-operated data loggers. Its SPI interface simplifies connection to microcontrollers and FPGAs, and the pseudo-differential input reduces noise coupling, ensuring reliable data capture in industrial environments.
Được đề xuất
Industrial Process Control
In industrial process control, the AD7944BCPZ provides accurate, high-speed conversion of sensor signals such as temperature, pressure, and flow. Its 14-bit resolution ensures fine granularity, while the 2.5 MSPS throughput allows real-time monitoring of fast-changing processes. The device operates over -40°C to +85°C, suitable for harsh factory environments. The serial interface with VIO supply enables direct connection to 1.8V or 3.3V logic, simplifying integration with industrial controllers. Its low power dissipation reduces heat in control cabinets, enhancing system reliability.
Được đề xuất
Medical Instrumentation
The AD7944BCPZ is well-suited for medical instrumentation such as patient monitoring and diagnostic equipment. Its high speed and resolution enable accurate digitization of biological signals like ECG and EEG. The low power consumption of 15.5 mW is critical for battery-powered portable devices. The small LFCSP package saves board space in compact medical devices. The pseudo-differential input helps reject common-mode noise from the human body, improving signal quality. The SPI interface allows easy integration with medical-grade microcontrollers.
Được đề xuất
Portable Instrumentation
For portable instrumentation, the AD7944BCPZ offers an excellent balance of speed, resolution, and power efficiency. Its 2.5 MSPS sampling rate enables fast measurements, while 14-bit resolution provides good accuracy. The device's low power dissipation extends battery life in handheld meters and data loggers. The compact LFCSP package is ideal for space-constrained designs. The serial interface with VIO supply allows direct connection to low-voltage microcontrollers, reducing component count. The pseudo-differential input simplifies sensor interfacing.
Được đề xuất
Communication Systems
In communication systems, the AD7944BCPZ digitizes analog signals for baseband processing. Its high sampling rate of 2.5 MSPS supports wideband signals, while 14-bit resolution ensures good signal-to-noise ratio. The low power consumption is beneficial for battery-operated communication devices. The serial interface with VIO supply allows direct connection to DSPs and FPGAs. The pseudo-differential input helps reject common-mode interference, improving signal integrity in noisy environments.
Được đề xuất
Test and Measurement
The AD7944BCPZ is ideal for test and measurement equipment such as oscilloscopes and spectrum analyzers. Its 2.5 MSPS sampling rate captures fast transients, and 14-bit resolution provides accurate amplitude measurements. The low power consumption reduces heat in benchtop instruments. The compact LFCSP package allows high-density designs. The SPI interface enables fast data transfer to processing units. The pseudo-differential input supports various probe configurations, making it versatile for different measurement scenarios.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7944BCPZ — 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 | AD7944BCPZ-RL7 | AD7942BCPZ | AD7946BCPZ | AD7980BCPZ | AD7690BCPZ |
|---|---|---|---|---|---|---|
| Package | 20-LFCSP (4x4 mm) | 20-LFCSP (4x4 mm) - same | 20-LFCSP (4x4 mm) - same | 20-LFCSP (4x4 mm) - same | 20-LFCSP (4x4 mm) - same | 20-LFCSP (4x4 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 14 Bit | 14 Bit | 14 Bit | 14 Bit | 16 Bit | 16 Bit |
| Sampling Rate | 2.5 MSPS | 2.5 MSPS | 250 kSPS | 4 MSPS | 1 MSPS | 400 kSPS |
| Input Type | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential |
| Data Interface | SPI, DSP | SPI, DSP | SPI, DSP | SPI, DSP | SPI, DSP | SPI, DSP |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -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
- Higher sampling rate than AD7942 (vsAD7942BCPZ)
- Lower power than higher-speed alternatives (vsAD7946BCPZ)
- 14-bit resolution with 2.5 MSPS (vsAD7980BCPZ)
Ghi chú thiết kế
The AD7944BCPZ requires a clean 2.5 V analog supply and a separate VIO supply for the digital interface. Use low-dropout regulators with low output noise and adequate decoupling capacitors (e.g., 10 uF and 0.1 uF) close to the VDD and VIO pins. The VIO supply should be matched to the host logic level to ensure proper signal levels and avoid latch-up.
For optimal performance, use a solid ground plane and separate analog and digital ground areas, connecting them at a single point near the ADC. Place the reference decoupling capacitor (e.g., 10 uF) close to the REF pin. Keep analog input traces short and shielded to minimize noise pickup. Follow the layout guidelines in the AD7944 datasheet for best results.
Ensure the reference voltage is stable and within the specified range, as it directly affects conversion accuracy. Avoid driving the analog input beyond the supply rails, as this can cause latch-up. The pseudo-differential input should be driven with a low-impedance source to maintain linearity. Also, ensure the serial clock (SCK) is clean and free of glitches to prevent data corruption.
Thông tin tuân thủ
RoHS compliance is indicated by the 'Z' suffix in the part number. Other compliance details not specified in the provided data.
