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VCA8617PAGRTIN/a42avai8-Channel Variable Gain Amplifier
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VCA8617PAGR-VCA8617PAGT
8-Channel Variable Gain Amplifier
Analog
Control 2-Pole
FilterDOUT CW Processor
(8 x 10)
5x8
FIFO
OUT8 VCA PGA 2-Pole
DIN
Serial
VCA8617

OUT8
VCA8617
www.ti.com
SBOS308F –AUGUST 2004–REVISED NOVEMBER 2009
8-Channel VARIABLE GAIN AMPLIFIER
Checkfor Samples: VCA8617
1FEATURES DESCRIPTION
23• 3V OPERATION
The VCA8617is an 8-channel variable gain amplifier
ideally suited to portable ultrasound applications.• LOW INPUT NOISE:
Excellent dynamic performance enables use in– 1.05nV/√HzatfIN= 5MHz low-power, high-performance portable applications.• EXTREMELY LOW POWER OPERATION: Each channel consists ofa 20dB gain Low-Noise 103mW/CHANNEL pre-Amplifier (LNA) anda Variable Gain Amplifier
(VGA). The differential outputsof the LNA can be• INTEGRATED LOW-PASS, ANTI-ALIASING switched through the 8x10 cross-point switch, whichBUTTERWORTH FILTER is programmable through the serial interface input– 14.5MHz BANDWIDTH port. INTEGRATED INPUT CLAMP DIODES The outputof the LNA• DIFFERENTIAL OUTPUT stage. The VGA consists
Voltage-Controlled Attenuator• INTEGRATED INPUT LNA
Programmable Gain Amplifier• READABLE CONTROL REGISTERS gain rangeof the PGA• INTEGRATED CONTINUOUS WAVE (CW) separately. The gainofPROCESSOR four discrete settings
40dB. The VCA has four
attenuation settings: 29dB,
Also, the VCA canbe continuously
voltage from 0dBtoa
36.5dB, and 40dB.
The output of the PGA
integrated low-pass filter.
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