特性
- User Programmable for Closed-Loop Gains of +1, -1 or +2 without Use of External Resistors
- Wide -3dB Bandwidth 850MHz
- Very Fast Slew Rate 2400V/µs
- Fast Settling Time (0.1%) 11ns
- High Output Current 60mA
- Excellent Gain Accuracy 0.99V/V
- Overdrive Recovery 10ns
- Standard Operational Amplifier Pinout
- Pb-Free Plus Anneal Available (RoHS Compliant)
HFA1112 Functional Diagram
描述
Support is limited to customers who have already adopted these products.
The HFA1112/12A are closed loop Buffers featuring user programmable gain and ultra high speed performance. Manufactured on Intersil's proprietary complementary bipolar UHF-1 process, these devices offer a wide -3dB bandwidth of 850MHz, very fast slew rate, excellent gain flatness, low distortion and high output current. The HFA1112A is a more stable version optimized for unity gain applications. A unique feature of the pinout allows the user to select a voltage gain of +1, -1, or +2, without the use of any external components. Gain selection is accomplished via connections to the inputs, as described in the Application Information section. The result is a more flexible product, fewer part types in inventory, and more efficient use of board space. Compatibility with existing op amp pinouts provides flexibility to upgrade low gain amplifiers, while decreasing component count. Unlike most buffers, the standard pinout provides an upgrade path should a higher closed loop gain be needed at a future date. This amplifier is available with programmable output limiting as the HFA1113. For applications requiring a standard buffer pinout, please refer to the HFA1110 data sheet.
应用
- RF/IF Processors
- Driving Flash A/D Converters
- High-Speed Communications
- Impedance Transformation
- Line Driving
- Video Switching and Routing
- Radar Systems
- Medical Imaging Systems
- Related Literature AN9507, Video Cable Drivers Save Board Space
| Part Number | Status | Samples | Stock | Package | Lead Count (#) | Carrier Type | Pb (Lead) Free | Temp. Range (°C) |
|---|---|---|---|---|---|---|---|---|
| HFA1112IBZ | Obsolete | N/A | Out of Stock | SOIC | 8# | Tube | No | -40 to +85°C |
| HFA1112IBZ96 | Obsolete | N/A | Out of Stock | SOIC | 8# | Reel | No | -40 to +85°C |
加载中
- 应用说明英语PDF 263 KB r13an0003eu0100-biasing-op-amps 2019年12月06日AI 生成的摘要: Proper biasing of operational amplifiers is essential to avoid malfunction in AC-coupled circuits. A missing DC bias path causes long stabilization times and potential failures. Adding input resistors to ground provides a DC path for bias currents, minimizing offset errors. For single-supply AC-coupled amplifiers, biasing uses a reference voltage, ideally from a high-PSRR voltage reference or buffered voltage divider, to maintain signal symmetry and reduce noise. Understanding frequency responses of input and feedback components is crucial for setting bandwidth and gain characteristics.
- 应用说明英语PDF 564 KB an1993 2018年5月22日AI 生成的摘要: Voltage feedback (VFB) amplifiers use a differential input pair, a high-impedance stage, and an output buffer to convert input voltage differences into output voltage. The VFB amplifier's gain decreases at a dominant pole frequency due to compensation capacitors. Current feedback (CFB) amplifiers include a class AB input amplifier, current mirror, high-impedance stage, and output buffer. CFB amplifiers provide faster switching and higher slew rates by drawing charge/discharge currents directly from supply rails, unlike VFB amplifiers which are limited by biasing current sources.
- EOL 通告英语PDF 233 KB PLC17040 2017年8月04日
- 产品变更通告英语PDF 152 KB PCN12085 2012年11月07日
- 应用说明英语PDF 357 KB an1694 2004年1月19日AI 生成的摘要: The document outlines the four fundamental internal blocks of an operational amplifier and presents a simple 2:1 stage circuit diagram. It includes important legal notices from Renesas Electronics regarding the use, liability, and intellectual property rights of their semiconductor products. The document clarifies product quality grades, intended applications, and restrictions on use in life-critical or hazardous systems. It emphasizes compliance with applicable laws and safety responsibilities when using Renesas products. Contact information for Renesas sales offices worldwide is also provided.
- 应用说明英语PDF 843 KB an535 2002年6月05日AI 生成的摘要: A Data Acquisition System (DAS) requires careful design of signal conditioning, transducer selection, and signal transmission to ensure high accuracy. Signal conditioning includes multiplexing, amplification, filtering, and calibration, ideally performed near the transducer. Transducers convert physical variables to electrical signals, often voltage, with low source resistance preferred. Signal paths can be single-ended or differential; differential paths better reject common mode noise, especially for low-level signals. Shielded twisted pairs and balanced lines reduce interference. Filters, typically Butterworth low-pass, prevent aliasing and maintain signal integrity.
- 应用说明英语PDF 405 KB an9663 1999年4月12日AI 生成的摘要: The document explains converting voltage-feedback amplifiers (VFAs) to current-feedback amplifiers (CFAs), emphasizing the critical role of the feedback resistor in stability and bandwidth. It highlights layout considerations to minimize stray capacitance and noise, advises on component selection, and discusses noise characteristics and accuracy differences between CFAs and VFAs. CFAs offer better high-frequency performance and cost advantages but require careful design adjustments.
- 应用说明英语PDF 245 KB an9507 1998年8月22日AI 生成的摘要: The document outlines important legal disclaimers and usage guidelines for semiconductor products. It emphasizes user responsibility for product design and safety, disclaims liabilities for damages, and restricts unauthorized modifications or reverse engineering. Products are categorized into 'Standard' and 'High Quality' grades, each intended for specific applications. Users must comply with environmental and export laws and ensure safety measures against product failures. Contact details for Renesas Electronics sales offices worldwide are provided.
- 应用说明英语PDF 334 KB an9787 1998年8月20日AI 生成的摘要: Current Feedback Amplifiers (CFAs) offer improved high-frequency performance and stability control through the adjustment of feedback resistor RE, which trades bandwidth for stability. CFAs maintain bandwidth largely independent of closed loop gain, unlike Voltage Feedback Amplifiers (VFAs). Slew rate depends on error current and input buffer performance, with inverting gain configurations achieving faster slew rates. CFAs require a feedback resistor and cannot replace VFAs in unity gain configurations without it. Excessive input capacitance or long PCB traces can cause instability. CFAs do not support classic inverting integrators but can use non-inverting integrators instead.
- 应用说明英语PDF 328 KB an9757 1998年8月19日AI 生成的摘要: The document presents design examples for single supply DC-coupled operational amplifier circuits using resistor ratio calculations derived from given input-output voltage data. It explains how to solve simultaneous equations to determine slope and intercept, then applies these to select resistor values for practical circuit implementation. The conclusion emphasizes that single supply op amp designs are as feasible as split supply designs if proper biasing and input protection are included. It also highlights limitations such as input voltage range and output saturation. Additionally, the document includes important legal disclaimers and contact information for Renesas Electronics sales offices worldwide.
- 应用说明英语PDF 585 KB an9420 1998年8月19日AI 生成的摘要: The document explains current feedback amplifier (CFA) theory, focusing on non-inverting and inverting circuit models, stability criteria using Bode plots, and the impact of feedback and input impedances on stability and bandwidth. It highlights the minor effect of closed loop gain on stability due to input buffer impedance and discusses the trade-off between DC precision and stability. The analysis includes frequency-dependent behavior of key parameters and the influence of input capacitance on stability.
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- 应用说明英语PDF 263 KB r13an0003eu0100-biasing-op-amps 2019年12月06日AI 生成的摘要: Proper biasing of operational amplifiers is essential to avoid malfunction in AC-coupled circuits. A missing DC bias path causes long stabilization times and potential failures. Adding input resistors to ground provides a DC path for bias currents, minimizing offset errors. For single-supply AC-coupled amplifiers, biasing uses a reference voltage, ideally from a high-PSRR voltage reference or buffered voltage divider, to maintain signal symmetry and reduce noise. Understanding frequency responses of input and feedback components is crucial for setting bandwidth and gain characteristics.
- 应用说明英语PDF 564 KB an1993 2018年5月22日AI 生成的摘要: Voltage feedback (VFB) amplifiers use a differential input pair, a high-impedance stage, and an output buffer to convert input voltage differences into output voltage. The VFB amplifier's gain decreases at a dominant pole frequency due to compensation capacitors. Current feedback (CFB) amplifiers include a class AB input amplifier, current mirror, high-impedance stage, and output buffer. CFB amplifiers provide faster switching and higher slew rates by drawing charge/discharge currents directly from supply rails, unlike VFB amplifiers which are limited by biasing current sources.
- 应用说明英语PDF 357 KB an1694 2004年1月19日AI 生成的摘要: The document outlines the four fundamental internal blocks of an operational amplifier and presents a simple 2:1 stage circuit diagram. It includes important legal notices from Renesas Electronics regarding the use, liability, and intellectual property rights of their semiconductor products. The document clarifies product quality grades, intended applications, and restrictions on use in life-critical or hazardous systems. It emphasizes compliance with applicable laws and safety responsibilities when using Renesas products. Contact information for Renesas sales offices worldwide is also provided.
- 应用说明英语PDF 843 KB an535 2002年6月05日AI 生成的摘要: A Data Acquisition System (DAS) requires careful design of signal conditioning, transducer selection, and signal transmission to ensure high accuracy. Signal conditioning includes multiplexing, amplification, filtering, and calibration, ideally performed near the transducer. Transducers convert physical variables to electrical signals, often voltage, with low source resistance preferred. Signal paths can be single-ended or differential; differential paths better reject common mode noise, especially for low-level signals. Shielded twisted pairs and balanced lines reduce interference. Filters, typically Butterworth low-pass, prevent aliasing and maintain signal integrity.
- 应用说明英语PDF 405 KB an9663 1999年4月12日AI 生成的摘要: The document explains converting voltage-feedback amplifiers (VFAs) to current-feedback amplifiers (CFAs), emphasizing the critical role of the feedback resistor in stability and bandwidth. It highlights layout considerations to minimize stray capacitance and noise, advises on component selection, and discusses noise characteristics and accuracy differences between CFAs and VFAs. CFAs offer better high-frequency performance and cost advantages but require careful design adjustments.查看更多 (9)
应用说明和白皮书 (9)
- EOL 通告英语PDF 233 KB PLC17040 2017年8月04日
- 产品变更通告英语PDF 152 KB PCN12085 2012年11月07日
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