Analog Devices Inc. AD7768 24位元ADC
Analog Devices AD7768 8/4通道、24位元Sigma-Delta (Σ-Δ) ADC內含Sigma-Delta調變器和每通道的數位濾波器，能提供AC和DC訊號的同步取樣。AD7768 ADC提供每通道最高256 kSPS的ADC輸出資料速率。AD7768 ADC可在最高110.8 kHz輸入頻寬下，達到108 dB動態範圍。其典型額定效能包括±2 ppm積分非線性 (INL)、±50 µV偏移誤差、±30 ppm增益誤差，以及−120 dB總諧波失真 (THD)。
AD7768提供高速、中等和節電模式供設計人員選擇，可選出最佳的雜訊效能與耗電量組合。AD7768 ADC有三種功率模式可選，能為低功耗DC和高效能AC測量模組提供可重複使用的平台。
AD7768 ADC也提供多樣化的數位濾波功能、經由sinc5濾波器的sinc響應、適用於低頻寬的低延遲路徑，以及低雜訊測量等功能。
特點
- 精準的AC與DC效能
- 8/4通道同步取樣
- 每通道256 kSPS ADC輸出資料速率
- 108 dB動態範圍
- 110.8kHz輸入頻寬 (BW)（−3dB頻寬）
- −120dB總諧波失真 (THD) 典型值
- ±2 ppm完整測量範圍 (FSR) 積分非線性 (INL)、±50 μV偏移誤差、±30 ppm增益誤差
- 最佳化的功率消耗和雜訊與輸入頻寬組合
- 可選擇功率、速度和輸入頻寬
- 高速：速度最快；110.8 kHz頻寬，每通道51.5 mW
- 中等：中等速度；55.4 kHz頻寬，每通道27.5 mW
- 節電：耗電最少；13.8 kHz頻寬，每通道9.375 mW
- 可選擇功率、速度和輸入頻寬
- 輸入頻寬範圍：DC至110.8 kHz
- 可程式輸入頻寬/取樣速率
- 資料介面的循環冗餘檢查 (CRC) 錯誤檢查
- 適用於菊鏈
- 線性相位數位濾波器
- 低延遲sinc5濾波器
- 寬頻磚牆式濾波器：±0.005 dB漣波至102.4 kHz
- 類比輸入預充電緩衝器
- 電源供應器
- AVDD1 = 5V，AVDD2 = 2.25V至5V
- IOVDD = 2.5V至3.3V，或IOVDD = 1.8V
- 64導線LQFP封裝，無腳墊
- 溫度範圍：-40°C至+105°C
應用
- 資料擷取系統：USB/PXI/乙太網路
- 儀器和工業控制迴路
- 音訊測試與測量
- 震動與資產條件監控
- 三相電源品質分析
- 聲納
- 高精度醫療用EEG/EMG/ECG
方塊圖
其他資源
- Understanding and Extending Safety Operation in a Sigma-Delta ADC
- Application Note
- How High Performance Modular Instruments Enable Greater Applications and Smaller Form Factor
- No Infidelity: Audio Test Platforms Benefit from New 24-Bit, Sigma-Delta ADC’s Superior SINAD
- Sigma-Delta ADC Clocking - More Than Jitter
- Article - Maximize the Performance of Your Sigma-Delta ADC Driver
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