LMH6521是包含两个高性能，数字控制可变增益放大器（DVGA）。此篇主要介绍了LMH6521特性、应用范围、参考设计电路以及电路分析，帮助大家缩短设计时间。
LMH6521特性：
LMH6521的两个通道都包含有一个独立的、线性度高的差分放大器，除此之外每个通道还可配置为高速掉电模式。每一块都被优化，用于低失真的系统设计。
The internal digitally controlled attenuator provides precise 0.5dB gain steps over a 31.5dB range. Serial and parallel programming options are provided. Serial mode programming utilizes the SPI interface. A Pulse mode is also offered where simple up or down commands can change the gain one step at a time.
LMH6521内部结构框图：
LMH6521参考设计电路：
LMH6521应用电路分析：The LMH6521 was designed primarily to be operated on 5V power supplies. The voltage range for VCC is 4.75V to 5.25V. When operated on a board with high speed digital signals it is important to provide isolation between digital signal noise and the LMH6521 inputs. The SP16160CH1RB reference board provides an example of good board layout.
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