AD7685BCPZ - 16-Bit 250kSPS PulSAR ADC | Analog Devices
MPN: AD7685BCPZ ✓ Hoạt độngAD7685BCPZ 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 employs a charge redistribution capacitor array to perform the conversion, offering a balance of speed, resolution, and power consumption. SAR ADCs are widely used in applications requiring high accuracy and moderate sampling rates, such as industrial process control, medical instrumentation, and portable battery-powered devices.
Key features of the AD7685BCPZ include 16-bit resolution with no missing codes, a 250 kSPS sampling rate, and a low power consumption of typically 3.5 mW at 5 V supply. The device also features a pseudo-differential input, an SPI-compatible serial interface, and a power-down mode for energy savings. The LFCSP package provides excellent thermal performance and a small footprint, enabling high-density PCB layouts.
The AD7685 uses a charge redistribution architecture with an internal track-and-hold circuit, ensuring accurate sampling of the input signal. The device includes a precision reference input that can be driven by an external reference, allowing flexibility in system design. The SPI interface supports daisy-chaining of multiple ADCs, simplifying multi-channel data acquisition systems.
Typical applications include battery-powered instrumentation, data acquisition systems, industrial process control, and medical devices. The AD7685's low power and high accuracy make it suitable for portable and remote sensing applications where power efficiency is critical.
When designing with the AD7685BCPZ, ensure a clean analog supply and a stable reference voltage to achieve optimal performance. Proper PCB layout with adequate decoupling and grounding is essential to minimize noise and maximize SNR.
Bộ thay thế dễ dàng lắp đặt cho AD7685BCPZ — 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 AD7685BCPZ (cùng hình factor và footprint) — khác nhau ở Sampling Rate, Input Type, Resolution, Package, Supply Voltage.
AD7685BCPZ-R2
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7685BCPZRL7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7690BCPZRL7
✅ 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 →AD7980BCPZ-RL7
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD7685BCPZ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Tỷ lệ lấy mẫu | 250 kSPS |
| Input Type | Pseudo-differential |
| Điện áp cung cấp | 2.3 V to 5.5 V |
| Power Consumption | 3.5 mW at 5 V |
| Giao diện | SPI |
| Hộp | 10-LFCSP-WD (3x3 mm) |
| Nhiệt độ hoạt động | -40C to +125C |
| No Missing Codes | Yes |
| Điện áp tham chiếu | External, 0.5V to VDD |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD7685BCPZ
| Chân 1 | VDD — Power supply, 2.3V to 5.5V |
| Chân 2 | GND — Ground |
| Chân 3 | REF — Reference input, external |
| Chân 4 | IN+ — Positive analog input |
| Chân 5 | IN- — Negative analog input |
| Chân 6 | SDO — Serial data output |
| Chân 7 | SCK — Serial clock input |
| Chân 8 | CS — Chip select, active low |
| Chân 9 | PD — Power down, active high |
| Chân 10 | EP — Exposed pad, connect to GND |
Ứng dụng tiêu biểu
AD7685BCPZ phù hợp cho 6 Áp dụngs: Battery-Powered Instrumentation, Data Acquisition Systems, Industrial Process Control, Medical Instrumentation, Portable Test Equipment, Sensor Signal Conditioning.
Battery-Powered Instrumentation
The AD7685BCPZ's low power consumption (3.5 mW at 5 V) and wide supply range (2.3 V to 5.5 V) make it ideal for portable instruments. Its 16-bit resolution ensures accurate measurements, while the small LFCSP package saves board space. The SPI interface simplifies connection to low-power microcontrollers, and power-down modes extend battery life in duty-cycled applications.
Được đề xuất
Data Acquisition Systems
The AD7685BCPZ provides 16-bit resolution at 250 kSPS, making it suitable for multi-channel data acquisition systems. Its pseudo-differential input rejects common-mode noise, and the SPI interface supports daisy-chaining for multiple channels. The device's low power and small footprint enable high-density designs in industrial and laboratory equipment.
Được đề xuất
Industrial Process Control
In industrial process control, the AD7685BCPZ offers the accuracy and speed needed for monitoring sensors and actuators. Its 16-bit resolution ensures precise control, while the wide supply range accommodates various industrial power rails. The device's robust operating temperature range (-40C to +125C) suits harsh environments, and the SPI interface integrates easily with industrial microcontrollers.
Được đề xuất
Medical Instrumentation
The AD7685BCPZ is well-suited for medical devices such as patient monitors and diagnostic equipment. Its low power consumption is critical for battery-operated devices, and the 16-bit resolution provides the accuracy required for vital sign measurements. The compact LFCSP package allows miniaturization, and the SPI interface enables easy integration with medical-grade microcontrollers.
Được đề xuất
Portable Test Equipment
For portable test equipment like handheld multimeters and data loggers, the AD7685BCPZ offers a balance of performance and power efficiency. Its 250 kSPS sampling rate is sufficient for many test applications, and the low power consumption extends battery life. The small package and SPI interface make it easy to design into compact, battery-powered devices.
Được đề xuất
Sensor Signal Conditioning
The AD7685BCPZ is ideal for conditioning signals from sensors such as temperature, pressure, and strain gauges. Its 16-bit resolution captures fine sensor variations, and the pseudo-differential input helps reject noise. The device's low power and small size are advantageous in distributed sensor networks, and the SPI interface allows easy connection to sensor hub microcontrollers.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7685BCPZ — 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 | AD7685BCPZ-R2 | AD7685BCPZRL7 | AD7690BCPZRL7 | AD7980BCPZ-RL7 |
|---|---|---|---|---|---|
| Package | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) | 10-LFCSP-WD (3x3 mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 400 kSPS | 1 MSPS |
| Supply Voltage | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V | 2.3V to 5.5V |
| Interface | SPI | SPI | SPI | SPI | SPI |
| Input Type | Pseudo-differential | Pseudo-differential | Pseudo-differential | Pseudo-differential | Pseudo-differential |
Bảo phân biệt quan trọng
- Low power consumption of 3.5 mW at 5V (vsAD7980BCPZ)
- 250 kSPS sampling rate (vsAD7690BCPZRL7)
- Small 10-lead LFCSP package (vsAD7980BCPZ)
Ghi chú thiết kế
The AD7685BCPZ operates from 2.3V to 5.5V. Use a low-noise LDO to supply VDD and a precision reference for REF. Decouple VDD with a 10uF and 0.1uF capacitor close to the pin. The reference input should be bypassed with a 10uF capacitor to ensure stable operation.
For optimal performance, place the AD7685BCPZ close to the signal source and use a solid ground plane. Keep analog and digital grounds separate and connect them at a single point. Route the SPI lines away from analog inputs to minimize crosstalk.
Ensure the input signal is within the specified common-mode range. The pseudo-differential input requires IN- to be connected to a reference voltage, typically GND. Avoid floating the PD pin; tie it to GND if not used. Also, ensure the SPI clock does not exceed the maximum specified frequency.
Thông tin tuân thủ
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.