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. The AD8325 is packaged in a low-cost 28-lead TSSOP, operates from a single 5 V supply, and has an operational temperature range of -40°C to +85°C. An evaluation board is available for this product and may be ordered using the following product number AD8325-EVAL. * 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 75Ω Output Impedance * Transmit Enable and Transmit Disable Modes * Upper Bandwidth:100 MHz (Full Gain Range) * 5 V Supply Operation * Supports SPI Interfaces