Datasheet > VCA8617_14

VCA8617_14

更新时间： 2024-11-04 02:58:47

品牌	Logo	应用领域
德州仪器 - TI		放大器
页数	文件大小	规格书
35页	725K
描述
8-Channel VARIABLE GAIN AMPLIFIER

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VCA8617_14 数据手册

VCA8617

www.ti.com

SBOS308F –AUGUST 2004–REVISED NOVEMBER 2009

8-Channel VARIABLE GAIN AMPLIFIER

Check for Samples: VCA8617

FEATURES

DESCRIPTION

•

3V OPERATION

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.

•

LOW INPUT NOISE:

–

1.05nV/√Hz at f_IN= 5MHz

EXTREMELY LOW POWER OPERATION:

103mW/CHANNEL

•

–

INTEGRATED LOW-PASS, ANTI-ALIASING

BUTTERWORTH FILTER

–

14.5MHz BANDWIDTH

•

INTEGRATED INPUT CLAMP DIODES

DIFFERENTIAL OUTPUT

The output of the LNA is fed directly into the VGA

stage. The VGA consists of two parts,

Voltage-Controlled Attenuator (VCA) and

INTEGRATED INPUT LNA

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.

READABLE CONTROL REGISTERS

INTEGRATED CONTINUOUS WAVE (CW)

PROCESSOR

The output of the PGA feeds directly into an

integrated low-pass filter.

VCA8617

5x8

CW Processor

(8 x 10)

CW(0-9)

D_OUT

FIFO

D_IN

Serial

CLK

Interface

ATN

Analog

Control

V_CNTRL

OUT1

2-Pole

Filter

IN1

LNA

VCA

PGA

V_LNA

OUT8

2-Pole

Filter

IN8

LNA

VCA

PGA

V_LNA

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.

SPI is a trademark of Motorola, Inc.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...35

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