SP Amp Variable Gain Amp Dual 5.25V 48-Pin TQFP T/R

The VCA2613 is a dual, Low-Noise Preamplifier (LNP), plus low-noise Variable Gain Amplifier (VGA). The combination 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 5dB, 17dB, 22dB or 25dB. Low input impedance is achieved by AT, resulting in as much as a 4.6dB improvement in noise figure over conventional shunt termination. The termination value can also be switched to accommodate 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 0dB 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 combination 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.

LOW NOISE PREAMP:

• Low Input Noise: 1.0nV/vHz
• Active Termination Noise Reduction
• Switchable Termination Value
• 80MHz Bandwidth
• 5dB to 25dB Gain
• Differential In and Out

LOW NOISE VARIABLE GAIN AMPLIFIER:

• Low Noise VCA: 3.3nV/vHz, Differential Programming Optimizes Noise Figure
• 24dB to 45dB Gain
• 40MHz Bandwidth
• Differential In and Out

LOW CROSSTALK: 52dB at Max Gain, 5MHz

HIGH-SPEED VARIABLE GAIN ADJUST

SWITCHABLE EXTERNAL PROCESSING

APPLICATIONS

• ULTRASOUND SYSTEMS
• WIRELESS RECEIVERS
• TEST EQUIPMENT