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VCA8500_0803

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
40页 993K
描述
8-Channel, Ultralow-Power, Variable Gain Amplifier with Low-Noise Pre-Amp

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VCA8500_0803 数据手册

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VCA8500  
www.ti.com  
SBOS390A–JANUARY 2008–REVISED MARCH 2008  
8-Channel, Ultralow-Power, Variable Gain Amplifier  
with Low-Noise Pre-Amp  
1
FEATURES  
APPLICATIONS  
•
Medical Imaging, Ultrasound Systems  
2345  
•
Ultralow Power: 65mW/Channel  
–
–
Portable Systems  
Low- and 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: 46dB  
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  
46dB 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: ±0.5dB  
Excellent Channel Matching: ±0.25dB  
•
•
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 a small QFN-64 PowerPAD™ package.  
•
•
Serial Control Interface  
Small Package: QFN-64, 9×9mm  
CW Switch Matrix  
(8 in ´ 10 out)  
CW  
OUT  
Logic  
SDI  
OUT  
OUT  
LPF  
(Two-  
pole)  
(1)  
PGA  
Attenuation  
(46dB)  
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
4
5
PowerPAD is a trademark of Texas Instruments.  
Infineon is a registered trademark of Infineon Technologies.  
SPI is a trademark of Motorola.  
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.  
Copyright © 2008, Texas Instruments Incorporated  
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