Amplifier is suitable for cable set top boxes, cable modems, xDSL modems and xDSL central office line cards. It offers very low noise, high performance amplifiers that are widely deployed as xDSL receivers.

The first VGA that precedes the filters offers 24dB of continuous gain control with fixed gain options of 9dB, 12dB, and 15dB, and sets a differential input impedance of 400ohms. The filters provide a six-pole Butterworth response with 0.5dB corner frequencies from 1MHz to 63MHz in 1MHz steps. For operation beyond 63MHz, the filter can be disabled and completely bypassed, thereby extending the ?3dB BW up to 1100MHz. A wideband peak detector is available to monitor the peak signal at the filter inputs. The pair of VGAs that follow the filters each provides 24dB of continuous gain control with fixed gain options of 12dB, 15dB, 18dB, and 21dB. The output buffers offer an additional option of 3dB or 9dB gain and provide a differential output impedance of less than 10ohms. They are capable of driving 1.5Vp-p into 400ohms loads at better than 65dBc HD3. The output common-mode voltage defaults to VPS/2 and can be adjusted down to 900mV via the VOCM pin. Independent, built-in dc offset correction loops for each channel can be disabled via the SPI if fully dc-coupled operation is desired. The high-pass corner frequency is determined by external capacitors on the OFS1 and OFS2 pins and the postfilter VGA gain.