OPA323
- Zero cross amplifier for 1.7V to 5.5V applications
- High rail-to-rail CMRR: 114dB typical
- High gain-bandwidth product: 20MHz
- Fast slew-rate: 33V/µs typical
- Fast 0.01% settling: 200ns typical for 2V step
- Low input offset voltage: ±150µV typical
- Low noise floor: 5.5nV/√Hz typical at 10kHz
- High output current: ±110mA typical ISC at 5.5V
- Quiescent current: 1.6mA/ch typical
- Rail-to-rail input and output
- Unity-gain stable
- Drives up to 150pF without sustained oscillations
- Internal RFI and EMI filtered input pins
- Operating temperature range: –40°C to 125°C
The OPAx323 family of op amps includes single (OPA323), dual (OPA2323), and quad-channel (OPA4323), low-voltage (1.7V to 5.5V), high-bandwidth (20MHz) amplifiers (op amps) with a zero-crossover input stage and a rail-to-rail output stage. The zero-crossover input stage enables OPAx323 to achieve high linearity and low distortion for input signals with rail-to-rail swing that are typical in ADC driver applications. Gain-bandwidth of 20MHz provides a fast settling response for ADC sampling speeds between 0.5MSPS to 5MSPS depending on the settling performance required. The OPAx323 is well-optimized for power savings as the device consumes just 1.6mA typical quiescent current.
The OPAx323 easily supports precision performance in high gain voltage sensing applications such as the wheatstone bridge, because of a maximum offset drift of 2µV/°C and thermal noise floor of 5.5nV/rt-Hz with a minimum of 100dB CMRR. This unique combination of higher precision (low offset, drift, noise, distortion, and CMRR) and higher gain-bandwidth (fast settling and slewing) enables use in multiple applications such as the motor rotary encoders, microphone audio pre-amplifiers and ultrasonic transducers.
The OPAx323 achieves a high slew-rate of 33V/µs allowing for fast detection of faults in motor current sensing applications. Unlike traditional amplifiers, the zero-cross over input stage allows for identical precision performance for both low and high-side sensing applications, thus making OPAx323 the best choice for current sensing in a variety of end equipments such as the solar string inverters, power delivery, grid and EV infrastructure. OPAx323S devices provide shutdown functionality for additional power savings and help disable the amplifier when idle. The family features standard and small size as well as leaded and QFN packages across all the channel variants.
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 | OPAx323 20MHz High Bandwidth, 114dB CMRR, Low Voltage (1.7V to 5.5V), RRIO Zero-Cross Operational Amplifier datasheet (Rev. C) | PDF | HTML | 2025/4/10 | ||
| 應用說明 | Create Automated SPICE Designs Using PSpice-for-TI | PDF | HTML | 2025/10/27 | |||
| Circuit design | Half-Wave Rectifier Circuit (Rev. B) | PDF | HTML | 2024/5/17 | |||
| Circuit design | Photodiode Amplifier Circuit (Rev. B) | PDF | HTML | 2024/5/2 | |||
| Application brief | Zero-crossover Amplifiers: Features and Benefits (Rev. B) | PDF | HTML | 2023/11/8 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
DIP-ADAPTER-EVM — DIP 轉接器評估模組
Speed up your op amp prototyping and testing with the DIP-Adapter-EVM, which provides a fast, easy and inexpensive way to interface with small, surface-mount ICs. You can connect any supported op amp using the included Samtec terminal strips or wire them directly to existing circuits.
The (...)
DIYAMP-EVM — 通用自製 (DIY) 放大器電路評估模組
DIYAMP-EVM 是一系列評估模組 (EVM)，提供工程師與自組愛好者 (DIYers) 實作型放大器電路，協助快速驗證設計概念並模擬結果。提供三種業界標準封裝（SC70、SOT-23 和 SOIC）與 12 種常見放大器配置，支援單電源與雙電源架構的放大器、濾波器、穩定補償與比較器應用。
DIYAMP-EVM 可快速製作電路原型，並採用常見的 0805 或 0603 表面裝載元件。透過多種組合方式，此 EVM 可建立從簡單放大器電路到複雜訊號鏈的各種評估電路。此 EVM 支援模擬板、超微型 A 版 (SMA)、接頭和有線介面連接方式，並與大多數類比數位轉換器 (ADC) (...)
OPAx323 Stability Automated Non-Inverting Amplifier PSpice Model
OPAx32x Simulation for Half-Wave Rectifier Circuit TINA-TI Reference Design
Simulation for Photodiode Amplifier TINA-TI Reference Design
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
PSpice for TI 設計和模擬環境可讓您使用其內建函式庫來模擬複雜的混合訊號設計。在進行佈局和製造之前，建立完整的終端設備設計和解決方案原型，進而縮短上市時間並降低開發成本。
在 PSpice for TI 設計與模擬工具中，您可以搜尋 TI (...)
TINA-TI — 基於 SPICE 的類比模擬程式
TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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 |
|---|---|---|
| SOT-SC70 (DCK) | 5 | Ultra Librarian |