VCA2613 Datasheet | Burr-Brown

FEATURES q LOW NOISE PREAMP: Low Input Noise: 1.0n V/√Hz Active Termination Noise Reduction Switchable Termination Value 80MHz Bandwidth 5d B to 25d B Gain Differential In and Out q LOW NOISE VARIABLE GAIN AMPLIFIER: Low Noise VCA: 3.3n V/√Hz, Differential Programming Optimizes Noise Figure 24d B to 45d B Gain 40MHz Bandwidth Differential In and Out q LOW CROSSTALK: 52d B at Max Gain, 5MHz q HIGH-SPEED VARIABLE GAIN ADJUST q SWITCHABLE EXTERNAL PROCESSING DESCRIPTION The VCA2613 is a dual, Low-Noise Preamplifier (LNP), plus low-noise Variable Gain Amplifier (VGA). The bination of Active Termination (AT) and Maximum Gain Select (MGS) allow for the best noise performance. The VCA2613 also features low crosstalk and outstanding distortion performance. The LNP has differential input and output capability and is strappable for gains of 5d B, 17d B, 22d B or 25d B. Low input impedance is achieved by AT, resulting in as much as a 4.6d B improvement in noise figure over conventional shunt termination. The termination value can also be switched to acmodate different sources. The output of the LNP is available for external signal processing. The variable gain is controlled by an analog voltage whose gain varies from 0d B to the gain set by the MGS. The ability to program the variable gain also allows the user to optimize dynamic range. The VCA input can be switched from the LNP to external circuits for different applications. The output can be used in either a single-ended or differential mode to drive high-performance Analog-to-Digital (A/D) converters, and is cleanly limited for optimum overdrive recovery. The bination of low noise, gain, and gain range programmability makes the VCA2613 a versatile building block in a number of applications where noise performance is critical. The VCA2613 is available in a TQFP-48 package. Maximum Gain Select FBCNTL RF2 RF1 LNPOUTN VCAINN VCACNTL MGS0 MGS1 MGS2 FBSW FB VCA2613 (1 of 2 Channels) APPLICATIONS q ULTRASOUND SYSTEMS q WIRELESS RECEIVERS q...