LM7705
- Regulated Output Voltage −0.232 V
- Output Voltage Tolerance 5%
- Output Voltage Ripple 4 mVPP
- Supply Voltage 3 V to 5.25 V
- Conversion Efficiency Up to 98%
- Quiescent Current 78 µA
- Shutdown Current 20 nA
- Turnon Time 500 µs
- Operating Temperature Range −40°C to 125°C
- 8-Pin VSSOP Package
The LM7705 device is a switched capacitor voltage inverter with a low noise, −0.23 V fixed negative voltage regulator. This device is designed to be used with low voltage amplifiers to enable the amplifiers output to swing to zero volts. The −0.23 V is used to supply the negative supply pin of an amplifier while maintaining less then 5.5 V across the amplifier. Rail-to-Rail output amplifiers cannot output zero volts when operating from a single-supply voltage and can result in error accumulation due to amplifier output saturation voltage being amplified by following gain stages. A small negative supply voltage will prevent the amplifiers output from saturating at zero volts and will help maintain an accurate zero through a signal processing chain. Additionally, when an amplifier is used to drive an input of the ADC, the amplifier can output a zero voltage signal and the full input range of an ADC can be used. The LM7705 device has a shutdown pin to minimize standby power consumption.
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 | LM7705 Low-Noise Negative Bias Generator datasheet (Rev. D) | PDF | HTML | 2018/5/8 | ||
| Circuit design | Charge pump circuit (–0.3V) for negative amplifier supply (Rev. A) | PDF | HTML | 2024/8/21 | |||
| 應用說明 | Quick Reference Guide To TI Buck Switching DC/DC Application Notes (Rev. B) | PDF | HTML | 2022/5/23 | |||
| 技術文章 | How to achieve microvoltage-level precision in thermopile applications | PDF | HTML | 2021/12/9 | |||
| 應用說明 | Attenuator Amplifier Design to Maximize the Input Voltage of Differential ADCs | 2018/6/14 | ||||
| 技術文章 | Unique active mux capability combines buffer and switch into one solution | PDF | HTML | 2017/10/10 |
設計與開發
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ADS8168EVM-PDK — ADS8168 8 通道 16 位元 1MSPS SAR ADC 評估模組性能展示套件 (PDK)
ADS8168 評估模組 (EVM) 性能示範套件 (PDK) 是用於評估 ADS8168 漸近法暫存器 (SAR) 類比轉數位轉換器 (ADC) 性能的平台。ADS8168EVM-PDK 內含 ADS8168EVM 板、精密主機介面 (PHI) 控制器電路板，以及隨附的電腦軟體，可讓使用者透過通用序列匯流排 (USB) 與 ADC 通訊、擷取資料，以及執行資料分析。
LM7705MMEVAL — 用於 LM7705 的評估板
This evaluation board is designed to demonstrate the functionality of Texas Instruments LM7705 Low Noise Negative Bias Generator. The board has a dual Operational Amplifier that can be connected to ground or biased with the on board LM7705. In the last case a True zero amplifier is demonstrated.
許多 TI 參考設計包含 LM7705
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。