參數(shù)資料
型號(hào)： VCA8617
元件分類： 可變?cè)鲆娣糯笃?/td>
英文描述： 8-Channel VARIABLE GAIN AMPLIFIER
中文描述： 8通道可變?cè)鲆娣糯笃?/td>
文件頁數(shù)： 1/26頁
文件大小： 400K
代理商： VCA8617
FEATURES
3V OPERATION
LOW INPUT NOISE: 1.0nV/ Hz at f
IN
= 5MHz
EXTREMELY LOW POWER OPERATION:
100mW/CHANNEL
INTEGRATED LOW-PASS, 2-POLE FILTER
15MHz BANDWIDTH
INTEGRATED INPUT CLAMP DIODES
DIFFERENTIAL OUTPUT
INTEGRATED INPUT LNA
READABLE CONTROL REGISTERS
INTEGRATED CONTINUOUS WAVE (CW)
PROCESSOR
DESCRIPTION
The VCA8617 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 20dB gain 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 gain range of the PGA can be
digitally configured separately. The gain of the PGA can
vary between four discrete settings of 25dB, 30dB,
35dB, and 40dB. 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
two-pole, low-pass filter.
10x8
FIFO
OutP
(1)
OutN
(1)
LNAIN1
LNA
V
LNA
V
LNA
Attenuator
Analog
Control
PGA
2Pole
Filter
CW Processor
OutP
(8)
OutN
(8)
LNAIN8
LNA
Attenuator
PGA
2Pole
Filter
+
1
8
+
DATA
CLK
CS
Serial
Interface
Analog
Control
CW(09)
D(03)
VCA8617
SBOS308B AUGUST 2004 REVISED NOVEMBER 2004
8-Channel
VARIABLE GAIN AMPLIFIER
!
!
www.ti.com
Copyright
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.
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