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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
VCA8617OUT8
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, which
BUTTERWORTH 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 LNAProgrammable Gain Amplifier
• READABLE CONTROL REGISTERS gain rangeof the PGA
• INTEGRATED CONTINUOUS WAVE (CW) separately. The gainof
PROCESSOR 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.
