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VCA2616 Datasheet(PDF) 1 Page - Burr-Brown (TI) |
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VCA2616 Datasheet(HTML) 1 Page - Burr-Brown (TI) |
1 / 19 page FEATURES q LOW-NOISE PREAMP: – Low Input Noise: 0.95nV/ √Hz – Active Termination Noise Reduction – Switchable Termination Value – 80MHz Bandwidth – 5dB to 25dB Gain – Differential In and Out q LOW-NOISE VARIABLE GAIN AMPLIFIER: – Low-Noise VCA – Up to 40dB Gain Range – 40MHz Bandwidth – Differential In and Out q LOW CROSSTALK: 66dB at Max Gain, 5MHz q HIGH-SPEED VARIABLE GAIN ADJUST q SWITCHABLE EXTERNAL PROCESSING APPLICATIONS q ULTRASOUND SYSTEMS q WIRELESS RECEIVERS q TEST EQUIPMENT DESCRIPTION The VCA2616 and VCA2611 are dual, Low-Noise Preamplifiers (LNP), plus low-noise Variable Gain Amplifiers (VGA). The VCA2611 is an upgraded version of the VCA2616. The only difference between the VCA2616 and the VCA2611 is the input structure to the LNP. The VCA2616 is limited to –0.3V negative- going input spikes; the VCA2611 is limited to –2.0V negative- going input spikes. This change allows the user to use slower and less expensive input clamping diodes prior to the LNP input. In some designs, input clamping may not be required. The combination of Active Termination (AT) and Maximum Gain Select (MGS) allow for the best noise performance. The VCA2616 and VCA2611 also feature low crosstalk and out- standing 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 termina- tion. The termination value can also be switched to accommo- date 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 program- mability makes the VCA2616 and VCA2611 versatile building blocks in a number of applications where noise performance is critical. The VCA2616 and VCA2611 are available in a TQFP-48 package. Dual, Variable-Gain Amplifier with Low-Noise Preamp Low Noise Preamp 5dB to 25dB Programmable Gain Amplifier 24 to 45dB Voltage Controlled Attenuator Analog Control Maximum Gain Select RF 2 RF 1 FB FBSW LNP INP LNP INN LNP GS1 LNP GS2 LNP GS3 LNP Gain Set Input LNP OUTP SEL VCA INP LNP OUTN VCA INN VCA CNTL FB CNTL VCA OUTP VCA OUTN MGS 1 MGS 2 MGS 3 Maximum Gain Select VCA2616 (1 of 2 Channels) VCA2616 VCA2611 SBOS234E – MARCH 2002 – REVISED NOVEMBER 2004 VCA2 616 www.ti.com Copyright © 2002-2004, Texas Instruments Incorporated All trademarks are the property of their respective owners. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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