VCA820
- 150-MHz Small-Signal Bandwidth
- 137-MHz, 5-VPP Bandwidth (G = +10 V/V)
- 0.1-dB Gain Flatness to 28 MHz
- 1700-V/µs Slew Rate
- > 40-dB Gain Adjust Range
- High Gain Accuracy: 20 dB ±0.4dB
- High Output Current: 160 mA
- APPLICATIONS
- AGC Receivers With RSSI
- Differential Line Receivers
- Pulse Amplitude Compensation
- Variable Attenuators
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The VCA820 is a dc-coupled, wideband, linear in dB, continuously variable, voltage-controlled gain amplifier. The VCA820 provides a differential input to single-ended conversion with a high-impedance gain control input, used to vary the gain down 40 dB from the nominal maximum gain set by the gain resistor (RG) and feedback resistor (RF).
The VCA820 internal architecture consists of two input buffers and an output current feedback amplifier stage, integrated with a multiplier core to provide a complete variable gain amplifier (VGA) system that does not require external buffering. The maximum gain is set externally with two resistors, providing flexibility in designs. The maximum gain is intended to be set between +2 V/V and +100 V/V. Operating from ±5-V supplies, the gain control voltage for the VCA820 adjusts the gain linearly in dB as the control voltage varies from 0 V to +2 V. For example, set for a maximum gain of +10 V/V, the VCA820 provides 20 dB, at +2-V input, to 20 dB at 0-V input of gain control range. The VCA820 offers excellent gain linearity. For a 20-dB maximum gain, and a gain-control input voltage varying between 1 V and 2 V, the gain does not deviate by more than ±0.4dB (maximum at +25°C).
技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | VCA820 Wideband, > 40-dB Adjust Range, Linear in dB Variable Gain Amplifier 数据表 (Rev. D) | PDF | HTML | 2015年 9月 9日 | ||
电子书 | The Signal e-book: 有关运算放大器设计主题的博客文章汇编 | 英语版 | 2018年 1月 31日 | |||
应用手册 | Implementating a Variable-Length Cat5e Cable Equalizer | 2010年 4月 25日 | ||||
应用手册 | Wireline Data Transmission and Reception | 2010年 1月 27日 | ||||
应用手册 | 所选封装材料的热学和电学性质 | 2008年 10月 16日 |
设计和开发
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封装 | 引脚 | CAD 符号、封装和 3D 模型 |
---|---|---|
SOIC (D) | 14 | Ultra Librarian |
VSSOP (DGS) | 10 | Ultra Librarian |
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