AD8321

a 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 Upper Bandwidth: 235 MHz (Min Gain) 9 V Single Supply Operation Power-Down Functionality Supports SPI Interface Low Cost APPLICATIONS Gain Programmable Line Driver HFC High Speed Data Modems Interactive CATV Set-Top Boxes CATV Plant Test Equipment General Purpose IF Variable Gain Block Gain Programmable CATV Line Driver AD8321 FUNCTIONAL BLOCK DIAGRAM VCC GND VIN+ VIN– AD8321 INV ATTENUATOR CORE PWR AMP REVERSE AMP VOUT DATADASTHAIFLTARTECGHISTER DATA SHIFT REGISTER POWERDOWN/ SWITCH INTER PD DATEN CLK SDATA DISTORTIONOB–dBcSOLETE DESCRIPTION The AD8321 is a low cost digitally controlled variable gain amplifier optimized for coaxial line driving applications such as cable modems that are designed...