Datasheet > VCA8617PAGT

VCA8617PAGT

更新时间： 2024-11-02 21:55:15

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描述
8-Channel VARIABLE GAIN AMPLIFIER

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VCA8617PAGT 数据手册

VCA8617

SBOS308B − AUGUST 2004 − REVISED NOVEMBER 2004

8-Channel

VARIABLE GAIN AMPLIFIER

INTEGRATED INPUT CLAMP DIODES

DIFFERENTIAL OUTPUT

INTEGRATED INPUT LNA

READABLE CONTROL REGISTERS

INTEGRATED CONTINUOUS WAVE (CW)

PROCESSOR

F_DEATURES

3V OPERATION

LOW INPUT NOISE: 1.0nV//Hz at f = 5MHz

EXTREMELY LOW POWER OPERATION:

100mW/CHANNEL

INTEGRATED LOW-PASS, 2-POLE FILTER

15MHz BANDWIDTH

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.

(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.

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

10x8

(0−3)

(0−9)

CW Processor

FIFO

DATA

CLK

•••

Serial

Interface

Analog

Control

OutP⁽¹⁾

OutN⁽¹⁾

2−Pole

Filter

•••

LNAIN1

LNA

Attenuator

PGA

−

V_LNA

OutP⁽⁸⁾

OutN⁽⁸⁾

2−Pole

Filter

LNAIN8

LNA

Attenuator

PGA

−

Analog

Control

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.

All trademarks are the property of their respective owners.

ꢀꢁ ꢂ ꢃꢄ ꢅ ꢆꢇ ꢂꢈ ꢃ ꢉꢆꢉ ꢊꢋ ꢌꢍ ꢎ ꢏꢐ ꢑꢊꢍꢋ ꢊꢒ ꢓꢔ ꢎ ꢎ ꢕꢋꢑ ꢐꢒ ꢍꢌ ꢖꢔꢗ ꢘꢊꢓ ꢐꢑꢊ ꢍꢋ ꢙꢐ ꢑꢕꢚ ꢀꢎ ꢍꢙꢔ ꢓꢑꢒ

ꢓ ꢍꢋ ꢌꢍꢎ ꢏ ꢑꢍ ꢒ ꢖꢕ ꢓ ꢊ ꢌꢊ ꢓ ꢐ ꢑꢊ ꢍꢋꢒ ꢖ ꢕꢎ ꢑꢛꢕ ꢑꢕ ꢎ ꢏꢒ ꢍꢌ ꢆꢕꢜ ꢐꢒ ꢇꢋꢒ ꢑꢎ ꢔꢏ ꢕꢋꢑ ꢒ ꢒꢑ ꢐꢋꢙ ꢐꢎ ꢙ ꢝ ꢐꢎ ꢎ ꢐ ꢋꢑꢞꢚ

ꢀꢎ ꢍ ꢙꢔꢓ ꢑ ꢊꢍ ꢋ ꢖꢎ ꢍ ꢓ ꢕ ꢒ ꢒ ꢊꢋ ꢟ ꢙꢍ ꢕ ꢒ ꢋꢍꢑ ꢋꢕ ꢓꢕ ꢒꢒ ꢐꢎ ꢊꢘ ꢞ ꢊꢋꢓ ꢘꢔꢙ ꢕ ꢑꢕ ꢒꢑꢊ ꢋꢟ ꢍꢌ ꢐꢘ ꢘ ꢖꢐ ꢎ ꢐꢏ ꢕꢑꢕ ꢎ ꢒꢚ

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与VCA8617PAGT相关器件

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