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VCA8613YR Datasheet(PDF) 1 Page - Texas Instruments |
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VCA8613YR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 21 page 8-Channel VARIABLE GAIN AMPLIFIER FEATURES q 3V OPERATION q LOW INPUT NOISE: 1.2nV √Hz at f IN = 5MHz q EXTREMELY LOW POWER OPERATION: 75mW/CHANNEL q INTEGRATED LOW-PASS, 2-POLE FILTER 14MHz BANDWIDTH VCA8613 SBOS200C – APRIL 2003 – REVISED MARCH 2004 www.ti.com Copyright © 2003-2004, Texas Instruments Incorporated OutP(1) OutN(1) LNAIN1 LNA V LNA V LNA Attenuator Analog Control PGA 2-Pole Filter CW(1-10) D(0-3) CW Processor 5x8 FIFO OutP(8) OutN(8) LNAIN8 LNA Attenuator PGA 2-Pole Filter • • • • • • DATA CLK CS Serial Interface DESCRIPTION The VCA8613 is an 8-channel variable gain amplifier ideally suited to portable ultrasound applications. Excellent dynamic performance enables use in low-power, high-performance portable applications. Each channel consists of a Low-Noise pre-Amplifier (LNA) and a Variable Gain Amplifier (VGA). The differential outputs of the LNA can be switched through the 8x10 cross-point switch, which is programmable through the serial interface input port. The output of the LNA is fed directly into the VGA stage. The VGA consists of two parts, a Voltage Controlled Attenuator (VCA) and a Programmable Gain Amplifier (PGA). The gain and q INTEGRATED INPUT CLAMP DIODES q DIFFERENTIAL OUTPUT q INTEGRATED INPUT LNA q READABLE CONTROL REGISTERS q INTEGRATED CONTINUOUS WAVE (CW) PROCESSOR gain range of the PGA can be digitally configured separately. The gain of the PGA can be varied between two discrete settings of 21dB and 26dB. The VCA has four programmable maximum attenuation settings: 29dB, 33dB, 36.5dB, and 40dB. Also, the VCA can be continuously varied by a control voltage from 0dB to a maximum of 29dB, 33dB, 36.5dB, and 40dB. The output of the PGA feeds directly into an integrated 2-pole, low-pass filter, allowing for direct connection to a differential input Analog-to-Digital Converter (ADC), such as the ADS5121 or ADS5122 from Texas Instruments. The VCA8613 is available in a TQFP-64 package. 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. All trademarks are the property of their respective owners. VCA8613 ® 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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