AD AD8321是一款低成本、數(shù)字控制式可變增益放大器，并針對同軸線路驅(qū)動應用進行了優(yōu)化，如根據(jù)DOCSIS*(上行)標準設計的電纜調(diào)制解調(diào)器等。所需輸出增益由8比特串行字決定，輸出增益范圍為53.4 dB，增益變化為0.75 dB/LSB。
AD8321提供低成本的20引腳SOIC封裝，采用+9 V單電源供電，工作溫度范圍為-40℃至+85°C。
本產(chǎn)品提供評估板，請用以下器件編號訂購：AD8321-EVAL。評估板的原理圖和布局參見產(chǎn)品數(shù)據(jù)手冊。
特點和優(yōu)勢
線性dB增益響應，增益范圍：>53 dB
驅(qū)動低失真(>11 dBm)信號至75 Ω負載中：SFDR：–53 dBc (42 MHz)
極低輸出噪聲電平
在上電和關斷情況下保持75 Ω恒定輸出阻抗
無需線路變壓器
上行帶寬：235 MHz(最小增益)
9 V單電源供電
省電功能
支持SPI接口
低成本
FEATURES
Linear in dB Gain Response Over >53 dB Range
Drives Low Distortion >11 dBm Signal into 75 ? Load:
–53 dBc SFDR at 42 MHz
Very Low Output Noise Level
Maintains Constant 75 ? Output Impedance
Power-Up and Power-Down Condition
No Line Transformer Required VIN+
Upper Bandwidth: 235 MHz (Min Gain) VIN–
9V Single Supply Operation
Power-Down Functionality
Supports SPI Interface
Low Cost
AD8321 功能框圖
**注意 & Noted:
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