AD7986BCPZ - 18-Bit 2 MSPS SAR ADC | Analog Devices
MPN： AD7986BCPZ ✓ 啟用中AD7986BCPZ 概覽
An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital numbers, enabling digital processing and storage. SAR ADCs use a binary search algorithm to determine the digital output, offering a good balance of speed, resolution, and power consumption. The AD7986 belongs to the PulSAR family, known for high accuracy and low noise, and is used in applications such as medical imaging, industrial process control, and scientific instrumentation.
Key features include a 2 MSPS throughput, 18-bit resolution, and a typical signal-to-noise ratio (SNR) of 98 dB. The device supports both SPI and daisy-chain serial interfaces, allowing multiple ADCs to be connected to a single bus. It also includes a busy indicator and a conversion result readback feature. The LFCSP package provides excellent thermal performance and a small footprint for space-constrained designs.
The AD7986 uses a charge redistribution architecture with an internal reference buffer, achieving high linearity and low drift. The device operates over the industrial temperature range of -40°C to +85°C. Its low power dissipation and high speed make it suitable for portable and battery-powered instruments where power efficiency is critical.
Typical applications include high-speed data acquisition, medical imaging (e.g., ultrasound), industrial automation, and test and measurement equipment. The device's high SNR and low distortion ensure accurate signal reproduction in demanding environments.
When designing with the AD7986, ensure proper decoupling of the AVDD and DVDD supplies, and use a low-noise reference voltage source. The VIO pin must be connected to the appropriate logic level to match the host interface. Careful PCB layout, including a solid ground plane and short trace lengths, is essential to achieve the specified performance.
直接替換替代品，適用於 AD7986BCPZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD7986BCPZ （相同外形與佔位） — 差異在於 Input Type, Resolution, Sampling Rate.
AD7986BCPZ-RL7
✅ 直接替換📋 參考替代品（不在目錄中）
AD7980BCPZ-RL7
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD7986BCPZ 最大額定值與電氣特性
| 解析度 | 18 Bit |
| 取樣率 | 2 MSPS |
| Number of Inputs | 1 |
| Input Type | Differential |
| Architecture | SAR |
| 供應電壓 | 2.5 V |
| Digital Supply Voltage (VIO) | 1.8 V to 2.7 V |
| Power Dissipation | 15 mW |
| SNR (Typical) | 98 dB |
| 介面 | SPI, Daisy-Chain |
| 封裝 | 20-Lead LFCSP (4x4 mm) |
| 工作溫度範圍 | -40°C to +85°C |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
| 安裝類型 | Surface Mount |
AD7986BCPZ 腳位配置
| 腳位 1 | AVDD — Analog power supply (2.5 V) |
| 腳位 2 | IN+ — Positive differential input |
| 腳位 3 | IN- — Negative differential input |
| 腳位 4 | GND — Ground |
| 腳位 5 | REF — Reference voltage input |
| 腳位 6 | REFGND — Reference ground |
| 腳位 7 | DVDD — Digital power supply (2.5 V) |
| 腳位 8 | VIO — Digital interface supply (1.8 V to 2.7 V) |
| 腳位 9 | SDI — Serial data input (for daisy-chain) |
| 腳位 10 | SCK — Serial clock input |
| 腳位 11 | SDO — Serial data output |
| 腳位 12 | CNV — Conversion start input |
| 腳位 13 | BUSY — Busy indicator output |
| 腳位 14 | GND — Ground |
| 腳位 15 | GND — Ground |
| 腳位 16 | GND — Ground |
| 腳位 17 | GND — Ground |
| 腳位 18 | GND — Ground |
| 腳位 19 | GND — Ground |
| 腳位 20 | GND — Ground |
典型應用
AD7986BCPZ 適用於 6 應用s: Medical Imaging, Industrial Automation, Test and Measurement, Scientific Instrumentation, Audio and Acoustic Analysis, Aerospace and Defense.
Medical Imaging
The AD7986BCPZ's 18-bit resolution and 2 MSPS sampling rate enable high-fidelity signal capture in ultrasound and MRI systems. Its low power consumption (15 mW) is critical for portable devices, and the high SNR (98 dB) ensures accurate image reconstruction. The differential input rejects common-mode noise, improving signal integrity in noisy clinical environments.
推薦
Industrial Automation
In industrial process control and automation, the AD7986BCPZ provides precise analog-to-digital conversion for sensors and transducers. Its 2 MSPS throughput supports real-time monitoring, while the SPI interface simplifies integration with microcontrollers. The wide operating temperature range (-40°C to +85°C) ensures reliability in harsh factory environments, and the low power dissipation reduces heat buildup in enclosed systems.
推薦
Test and Measurement
The AD7986BCPZ is ideal for high-speed data acquisition in oscilloscopes, spectrum analyzers, and other test equipment. Its 18-bit resolution and 2 MSPS sampling rate allow accurate capture of fast transient signals. The low noise and high linearity ensure measurement accuracy, while the small LFCSP package saves board space in compact instruments. The daisy-chain interface enables multi-channel synchronization.
推薦
Scientific Instrumentation
For scientific instruments such as spectrometers and particle detectors, the AD7986BCPZ offers the high resolution and speed needed to capture subtle signal variations. Its low power consumption is advantageous for battery-operated field instruments. The differential input reduces interference, and the wide temperature range supports outdoor and laboratory use. The SPI interface allows easy connection to DSPs and FPGAs.
推薦
Audio and Acoustic Analysis
The AD7986BCPZ's high SNR (98 dB) and 18-bit resolution make it suitable for professional audio and acoustic measurement applications. It can digitize high-frequency signals with low distortion, enabling accurate analysis of sound waves and vibrations. The low power consumption is beneficial for portable audio analyzers, and the small package allows integration into compact devices.
推薦
Aerospace and Defense
In aerospace and defense systems, the AD7986BCPZ provides reliable high-speed conversion for radar, communication, and guidance systems. Its wide temperature range and low power consumption are critical for airborne and satellite applications. The high SNR ensures signal integrity in noisy electromagnetic environments, and the compact LFCSP package withstands vibration and thermal cycling.
推薦
推薦產品摘要
工程參考資料，適用於 AD7986BCPZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD7986BCPZ-RL7 | AD7980BCPZ | AD7980BRMZ |
|---|---|---|---|---|
| Package | 20-Lead LFCSP (4x4 mm) | 20-Lead LFCSP (4x4 mm) - same | 20-Lead LFCSP (4x4 mm) - same | 10-Lead MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18 Bit | 18 Bit | 16 Bit | 16 Bit |
| Sampling Rate | 2 MSPS | 2 MSPS | 1 MSPS | 1 MSPS |
| Power Dissipation | 15 mW | 15 mW | 7 mW | 7 mW |
| SNR (Typical) | 98 dB | 98 dB | 91 dB | 91 dB |
| Interface | SPI, Daisy-Chain | SPI, Daisy-Chain | SPI, Daisy-Chain | SPI, Daisy-Chain |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
主要差異化特點
- Higher resolution and speed (對比AD7980BCPZ)
- Higher SNR (對比AD7980BCPZ)
- Pin-compatible with AD7980BCPZ (對比AD7980BCPZ)
設計說明
Use separate analog and digital power supplies (AVDD and DVDD) with proper decoupling. Place 0.1 µF and 10 µF capacitors close to each supply pin. The VIO supply should be decoupled with a 0.1 µF capacitor. Ensure the reference voltage (REF) is low-noise and stable, as it directly affects conversion accuracy.
Maintain a solid ground plane under the ADC and avoid routing digital traces near analog inputs. Keep the analog input traces short and shielded to minimize noise pickup. Use a star-ground topology to separate analog and digital grounds, connecting them at a single point. Follow the layout guidelines in the AD7986 datasheet for optimal performance.
Do not exceed the absolute maximum ratings for supply voltages. Ensure the VIO voltage matches the host interface logic level to avoid damage. The CNV pin must be held low during conversion to prevent false triggers. Use a low-jitter clock for SCK to maintain timing accuracy. Verify the reference voltage is within the specified range to avoid clipping.
合規資訊
RoHS compliant and lead-free per Analog Devices product page. AEC-Q100 not applicable for this industrial ADC.
