VCA8500

更新时间： 2024-11-03 03:20:31

品牌	Logo	应用领域
德州仪器 - TI		放大器
页数	文件大小	规格书
15页	297K
描述
8-Channel, Ultra-Low Power Variable Gain Amplifier with Low-Noise Pre-Amp

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VCA8500 数据手册

VCA8500

www.ti.com

SBOS390–JANUARY 2008

8-Channel, Ultra-Low Power Variable Gain Amplifier

with Low-Noise Pre-Amp

FEATURES

APPLICATIONS

•

Medical Imaging, Ultrasound Systems

•

Ultra-low Power: 63mW/Channel

–

Portable Systems

Low-, Mid-Range Systems

•

Low Noise: 0.8nV/√Hz

Low-Noise Pre-amp (LNP):

–

20dB Fixed Gain

DESCRIPTION

250mV_PPLinear Input Range

The VCA8500 is an 8-channel variable gain amplifier

consisting of a Low-Noise Pre-amplifier (LNP) and a

Variable-Gain Amplifier (VGA). This combination,

along with the device features, makes it ideal for a

variety of ultrasound systems.

•

Variable Gain Amplifier:

–

Gain Control Range: 45dB

Selectable PGA Gain: 20dB, 25dB, 27dB,

30dB

–

Fast Overload Recovery

Output Clamping Control

The LNP gain is fixed at 20dB, and has excellent

noise and signal handling characteristics. The gain of

the voltage-controlled attenuator can vary over a

45-dB range with a 0V to 1.2V control voltage

common to all channels of the VCA8500.

•

Integrated Low-Pass Filter:

–

Second-Order, Linear Phase

Bandwidth: 10MHz, 15MHz

The Post-Gain Amplifier (PGA) can be programmed

for four gain settings: 20dB, 25dB, 27dB, or 30dB

gain. As a means to improve system overload

recovery time, the VCA8500 provides an internal

clamping function. The PGA settings as well the

clamp levels are controlled through the serial

interface.

High Accuracy:

–

Low Gain Error: ±0.25 dB

Excellent Channel Matching: ±0.5dB

•

Distortion, HD2: –50dBc at 5MHz

Integrated CW Switch Matrix:

–

Easy Current Summing

The VCA8500 is built on TI’s BiCOM process and is

available in

package.

small, 64-pin QFN PowerPAD™

•

Serial Control Interface

Small Package: QFN-64, 9×9 mm

CW Switch Matrix

(8 in ´ 10 out)

OUT

Logic

SDI

OUT

VCA

(0dB to

-45dB)

LPF

(Two-

pole)

(1)

PGA

LNA

20dB

Clamping

Circuit

VCA8500

(1 of 8 Channels)

Gain

Control

NOTE (1): 20dB, 25dB, 27dB, or 30dB gain setting.

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.

PowerPAD is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

PRODUCT PREVIEW information concerns products in the

formative or design phase of development. Characteristic data and

other specifications are design goals. Texas Instruments reserves

the right to change or discontinue these products without notice.

12 3 4 5 6 7...15

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与VCA8500相关器件

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VCA8500_0803	TI	获取价格	8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp
VCA8500IRGCR	TI	获取价格	8-Channel, Ultra-Low Power Variable Gain Amplifier with Low-Noise Pre-Amp
VCA8500IRGCRG4	TI	获取价格	8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp
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VCA8613	TI	获取价格	8-Channel VARIABLE GAIN AMPLIFIER
VCA8613YR	TI	获取价格	8-Channel VARIABLE GAIN AMPLIFIER
VCA8613YT	TI	获取价格	8-Channel VARIABLE GAIN AMPLIFIER
VCA8617	TI	获取价格	8-Channel VARIABLE GAIN AMPLIFIER
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