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VCA8500IRGCR

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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VCA8500IRGCR 数据手册

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VCA8500  
www.ti.com  
SBOS390–JANUARY 2008  
8-Channel, Ultra-Low Power Variable Gain Amplifier  
with Low-Noise Pre-Amp  
1
FEATURES  
APPLICATIONS  
•
Medical Imaging, Ultrasound Systems  
23  
•
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  
250mVPP Linear 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.  
a
small, 64-pin QFN PowerPAD™  
•
•
Serial Control Interface  
Small Package: QFN-64, 9×9 mm  
CW Switch Matrix  
(8 in ´ 10 out)  
CW  
OUT  
Logic  
SDI  
OUT  
OUT  
VCA  
(0dB to  
-45dB)  
LPF  
(Two-  
pole)  
(1)  
PGA  
LNA  
IN  
LNA  
20dB  
Clamping  
Circuit  
VCA8500  
(1 of 8 Channels)  
Gain  
Control  
NOTE (1): 20dB, 25dB, 27dB, or 30dB gain setting.  
1
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.  
2
3
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.  
Copyright © 2008, Texas Instruments Incorporated  
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VCA8500IRGCR 替代型号

型号 品牌 替代类型 描述 数据表
VCA8500IRGCTG4 TI

完全替代

 8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp
VCA8500IRGCT TI

完全替代

 8-Channel, Ultra-Low Power Variable Gain Amplifier with Low-Noise Pre-Amp
VCA8500IRGCRG4 TI

类似代替

 8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp

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