GENERAL DESCRIPTION

The AD8325 is a low-cost, digitally controlled, variable gain amplifier optimized for coaxial line driving applications such as cable modems that are designed to the MCNS-DOCSIS upstream standard. An 8-bit serial word determines the desired output gain over a 59.45 dB range resulting in gain changes of 0.7526 dB/LSB.

FEATURES

Supports DOCSIS Standard for Reverse Path Transmission

Gain Programmable in 0.75 dB Steps Over a 59.45 dB Range

Low Distortion at 61 dBmV Output

–57 dBc SFDR at 21 MHz

–55 dBc SFDR at 42 MHz

Output Noise Level

–48 dBmV in 160 kHz

Maintains 75 Ω Output Impedance Transmit Enable and Transmit Disable Modes

Upper Bandwidth: 100 MHz (Full Gain Range)

5 V Supply Operation

Supports SPI Interfaces

APPLICATIONS

Gain-Programmable Line Driver DOCSIS High-Speed Data Modems Interactive Cable Set-Top Boxes PC Plug-in Cable Modems

General-Purpose Digitally Controlled Variable Gain Block

AD8325屬于集成電路（IC） > 驅(qū)動(dòng)器，接收器，收發(fā)器。亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的AD8325驅(qū)動(dòng)器，接收器，收發(fā)器該系列產(chǎn)品的主要功能是提供必需的硬件資源，以通過延長電纜或印制線進(jìn)行通信。確切的功能會(huì)因所采用的通信協(xié)議而異，可能包括諸如瞬態(tài)抑制之類的功能，這些功能對于通信用途可能并非絕對必要，但對于可能的使用環(huán)境卻是明智之選。