ADS1245
- 20-Bit Effective Resolution
- High-Impedance Buffered Input
- ±2.5V Differential Input Range
- Pin-Compatible with ADS1244
- 0.0006% INL (typ), 0.0015% INL (max)
- Simple Two-Wire Serial Interface
- Simultaneous 50Hz and 60Hz Rejection
- Single Conversions with Sleep Mode
- Single-Cycle Settling
- Self-Calibration
- Well Suited for Multi-Channel Systems
- Easily Connects to the MSP430
- Current Consumption: 158µA
- Analog Supply: 2.5V to 5.25V
- Digital Supply: 1.8V to 3.6V
- APPLICATIONS
- Hand-Held Instrumentation
- Portable Medical Equipment
- Industrial Process Control
- Test and Measurement Systems
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The ADS1245 is a 24-bit, delta-sigma analog-to-digital converter (ADC). It offers excellent performance and very low power in an MSOP-10 package and is well suited for demanding high-resolution measurements, especially in portable and other space- and power-constrained systems.
The buffered input presents an impedance of 3G
, minimizing measurement errors when using high-impedance sources. The ADS1245 is compatible with ADS1244 and offers a direct upgrade path for designs requiring higher input impedance.
A third-order delta-sigma (
) modulator and digital filter form the basis of the ADC. The analog modulator has a ±2.5V differential input range. The digital filter rejects both 50Hz and 60Hz signals, completely settles in one cycle, and outputs data at 15 samples per second (SPS).
A simple, two-wire serial interface provides all the necessary control. Data retrieval, self-calibration, and Sleep mode are handled with a few simple waveforms. When only single conversions are needed, the ADS1245 can be shut down (Sleep mode) while idle between measurements to dramatically reduce the overall power dissipation. Multiple ADS1245s can be connected together to create a synchronously sampling multichannel measurement system. The ADS1245 is designed to easily connect to microcontrollers, such as the MSP430.
The ADS1245 supports 2.5V to 5.25V analog supplies and 1.8V to 3.6V digital supplies. Power is typically less than 470µW in normal operation and less than 1µW during Sleep mode.
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技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | ADS1245: Low-Power, 24-Bit Analog-to-Digital Converter datasheet (Rev. A) | 2003/8/14 | |||
| 應用說明 | Digital Filter Types in Delta-Sigma ADCs (Rev. A) | PDF | HTML | 2023/3/29 | |||
| 電子書 | Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs | 2015/3/19 | ||||
| 應用說明 | Data Capture with Multiple ADS1244 or ADS1245 Devices in Parallel | 2004/6/2 | ||||
| 應用說明 | Inputs Currents for High-Resolution ADCs | 2003/3/6 |
設計與開發
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ANALOG-ENGINEER-CALC — PC software analog engineer's calculator
類比工程師的計算機旨在加速類比電路設計工程師定期使用的許多重複計算。此基於 PC 的工具提供圖形介面，列出各種常見計算，從使用回饋電阻器設定運算放大器增益到選擇適當的電路設計元件以穩定類比數位轉換器 (ADC) 驅動緩衝電路。
除了作為獨立工具使用外，此計算機還與類比工程師口袋參考中描述的概念相得益彰。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VSSOP (DGS) | 10 | Ultra Librarian |