AD7690BRMZ - 18-Bit 400kSPS PulSAR ADC | Analog Devices
MPN: AD7690BRMZ ✓ Hoạt độngAD7690BRMZ Tóm tắt
An ADC (analog-to-digital converter) is a device that converts continuous analog signals into discrete digital numbers, enabling digital processing of real-world signals. SAR ADCs use a binary search algorithm to approximate the input voltage, offering a good balance of speed, resolution, and power consumption. The AD7690 belongs to the PulSAR family, known for low power and high precision, and is widely used in data acquisition systems, industrial process control, and medical instrumentation.
Key features of the AD7690BRMZ include 18-bit resolution with no missing codes, a 400 kSPS sampling rate, and a power dissipation that scales linearly with throughput. The differential input range is ±VREF, with VREF ranging from 2.3V to 5.25V, allowing flexible reference configurations. The device also offers a pseudo-differential mode for single-ended applications. The SPI interface supports daisy-chaining, reducing the number of digital lines required in multi-channel systems.
Technically, the AD7690 uses a charge redistribution architecture with a capacitive DAC, achieving excellent linearity and low noise. The internal conversion clock eliminates the need for an external clock, simplifying design. The device operates over a temperature range of -40°C to +125°C, making it suitable for industrial environments. The MSOP-10 package is small, saving board space, and is available in tape and reel for automated assembly.
Typical applications include high-speed data acquisition, industrial process control, medical imaging, and battery-powered instrumentation. The high resolution and speed make it ideal for precision measurement systems where accuracy is critical. The low power consumption, which scales with throughput, is beneficial for portable devices.
When designing with the AD7690BRMZ, ensure a clean, low-impedance reference voltage and adequate decoupling on VDD and VIO. The differential input should be driven with a low-impedance source to maintain accuracy. For best performance, use a precision reference and careful PCB layout to minimize noise.
Bộ thay thế dễ dàng lắp đặt cho AD7690BRMZ — 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 AD7690BRMZ (cùng hình factor và footprint) — khác nhau ở Architecture, Package, Resolution, RoHS Status, Sampling Rate.
AD7690BRMZ-RL7
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD7980BRMZ
✅ Drop-In ⚠️ Thông số chưa được xác minh✗ Hết hàng
$16.8636 / Đơn vị
Xem tài liệu →AD7691BRMZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7693BRMZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7946BRM
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7690BRMZ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 18 bits |
| Tỷ lệ lấy mẫu | 400 kSPS |
| Input Type | Differential |
| Number of Inputs | 1 |
| Architecture | SAR |
| INL (Max) | 1.5 LSB |
| Supply Voltage (VDD) | 5 V |
| Logic Supply (VIO) | 1.8 V to 5 V |
| Reference Voltage (VREF) | 2.3 V to 5.25 V |
| Power Dissipation | 12.5 mW at 400 kSPS |
| Nhiệt độ hoạt động | -40°C to +125°C |
| Hộp | 10-MSOP |
| Kiểu lắp đặt | Surface Mount |
| Giao diện | SPI, DSP compatible |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD7690BRMZ
| Chân 1 | IN+ — Positive differential input |
| Chân 2 | IN- — Negative differential input |
| Chân 3 | GND — Ground |
| Chân 4 | VREF — Reference voltage input |
| Chân 5 | VDD — Power supply (5V) |
| Chân 6 | VIO — Logic supply (1.8V to 5V) |
| Chân 7 | SDI — Serial data input (for daisy-chain) |
| Chân 8 | SDO — Serial data output |
| Chân 9 | SCK — Serial clock input |
| Chân 10 | CNV — Convert input (start conversion) |
Ứng dụng tiêu biểu
AD7690BRMZ phù hợp cho 6 Áp dụngs: High-Speed Data Acquisition, Industrial Process Control, Medical Instrumentation, Battery-Powered Instrumentation, Precision Measurement Systems, Audio Test Equipment.
High-Speed Data Acquisition
The AD7690BRMZ's 400 kSPS sampling rate and 18-bit resolution make it ideal for high-speed data acquisition systems. It accurately captures fast-changing signals with low distortion, enabling precise measurement in applications like vibration analysis and transient recording. The SPI interface simplifies connection to microcontrollers or DSPs, and the differential input rejects common-mode noise, improving signal integrity.
Được đề xuất
Industrial Process Control
In industrial process control, the AD7690BRMZ provides high accuracy and stability over a wide temperature range (-40°C to +125°C). Its 18-bit resolution ensures precise monitoring of sensors such as pressure, temperature, and flow. The device's low power consumption and small MSOP package make it suitable for distributed control nodes. The SPI interface allows easy integration with industrial microcontrollers, and the differential input helps reject electrical noise common in factory environments.
Được đề xuất
Medical Instrumentation
The AD7690BRMZ is well-suited for medical instrumentation such as patient monitoring and diagnostic equipment. Its high resolution and low noise are critical for accurate biopotential measurements like ECG and EEG. The 400 kSPS sampling rate supports real-time signal processing, while the small package enables compact device designs. The device's low power consumption is beneficial for battery-powered portable monitors. The SPI interface allows seamless connection to medical-grade microcontrollers.
Được đề xuất
Battery-Powered Instrumentation
For battery-powered instruments, the AD7690BRMZ offers power scaling with throughput, consuming only 12.5 mW at 400 kSPS and less at lower rates. This makes it ideal for portable data loggers and field instruments. The wide supply voltage range (VDD 5V, VIO 1.8V-5V) allows operation from various battery chemistries. The small MSOP package minimizes board space, and the SPI interface reduces pin count, saving power and size.
Được đề xuất
Precision Measurement Systems
The AD7690BRMZ excels in precision measurement systems such as digital multimeters and precision scales. Its 18-bit resolution and 1.5 LSB INL ensure accurate readings. The differential input allows direct connection to bridge sensors, rejecting common-mode noise. The internal conversion clock simplifies design, and the SPI interface supports high-speed data transfer to the host processor. The device's stability over temperature ensures consistent performance in varying environments.
Được đề xuất
Audio Test Equipment
In audio test equipment, the AD7690BRMZ provides high-resolution digitization of audio signals for analysis. Its 18-bit resolution and 400 kSPS sampling rate capture audio frequencies with low distortion. The differential input reduces noise, and the low power consumption is suitable for portable test devices. The SPI interface allows easy integration with DSPs for real-time audio analysis. The device's small package is ideal for compact test instruments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD7690BRMZ — 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 | AD7690BRMZ-RL7 | AD7980BRMZ | AD7691BRMZ | AD7693BRMZ | AD7946BRM |
|---|---|---|---|---|---|---|
| Package | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18 bits | 18 bits | 18 bits | 16 bits | 16 bits | 14 bits |
| Sampling Rate | 400 kSPS | 400 kSPS | 400 kSPS | 250 kSPS | 500 kSPS | 250 kSPS |
| Input Type | Differential | Differential | Pseudo-differential | Differential | Differential | Differential |
| INL (Max) | 1.5 LSB | 1.5 LSB | 1.5 LSB | 1.5 LSB | 1.5 LSB | 1.5 LSB |
| Power Dissipation | 12.5 mW | 12.5 mW | 12.5 mW | 8.5 mW | 15 mW | 7.5 mW |
| Reference Voltage Range | 2.3V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V | 2.3V to 5.25V |
Bảo phân biệt quan trọng
- Higher resolution than AD7691BRMZ (vsAD7691BRMZ)
- Higher sampling rate than AD7946BRM (vsAD7946BRM)
- Differential input vs pseudo-differential in AD7980BRMZ (vsAD7980BRMZ)
Ghi chú thiết kế
Decouple VDD and VIO with 0.1uF and 10uF capacitors placed close to the pins. The VIO supply should be matched to the host logic level to avoid overvoltage. Power consumption scales with throughput, so reduce sampling rate to save power in battery applications.
Use a solid ground plane and separate analog and digital grounds, connecting them at a single point. Keep the reference input (VREF) clean with a low-impedance source and bypass capacitor. Route differential input traces symmetrically to minimize noise pickup.
Ensure the input signal settles within the acquisition time; use a low-impedance driver or buffer. Avoid exceeding the absolute maximum ratings on IN+ and IN-. For daisy-chain operation, ensure proper timing on SDI and CNV. Always consult the datasheet for recommended operating conditions.
Thông tin tuân thủ
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
