VCA2612

® VCA VCA2612 261 2 For most current data sheet and other product information, visit www.burr-brown.com Dual, VARIABLE GAIN AMPLIFIER with Low Noise Preamp TM FEATURES q LOW NOISE PREAMP: Low Input Noise: 1.25nV/√Hz Active Termination Noise Reduction Switchable Termination Value 80MHz Bandwidth 5dB to 25dB Gain Differential Input /Output q LOW NOISE VARIABLE GAIN AMPLIFIER: Low Noise VCA: 3.3nV/√Hz, Differential Programming Optimizes Noise Figure 24dB to 45dB Gain 40MHz Bandwidth Differential Input /Output q LOW CROSSTALK: 52dB at Max Gain, 5MHz q HIGH-SPEED VARIABLE GAIN ADJUST q SWITCHABLE EXTERNAL PROCESSING DESCRIPTION The VCA2612 is a highly integrated, dual receive channel, signal processing subsystem. Each channel of the product consists of a low noise pre-amplifier (LNP) and a Variable Gain Amplifier (VGA). The LNP circuit provides the necessary connections to implement Active Termination (AT), a method of cable termination which results in up to 4.6dB noise figure improvement. Different cable termination characteristics can be accommodated by utilizing the VCA2612’s switchable LNA feedback pins. The LNP has the ability to accept both differential and single ended inputs, and generates a differential output signal. The LNP provides strappable gains of 5dB, 17dB, 22dB and 25dB. The output of the LNP can be accessed externally for further signal processing, or fed directly into the VGA. The VCA2612’s VGA section consists of two parts, the Volta...