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AFE5808

更新时间： 2024-09-18 12:21:31
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德州仪器 - TI /
页数 文件大小 规格书
68页 1078K
描述
Fully Integrated, 8-Channel Ultrasound Analog Front End with Passive CW Mixer, 0.75nV/rtHz, 14/12-Bit, 65MSPS, 153mW/CH

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AFE5808 数据手册

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AFE5808  
www.ti.com  
SLOS688C –SEPTEMBER 2010–REVISED APRIL 2012  
Fully Integrated, 8-Channel Ultrasound Analog Front End with  
Passive CW Mixer, 0.75nV/rtHz, 14/12-Bit, 65MSPS, 153mW/CH  
Check for Samples: AFE5808  
1
FEATURES  
APPLICATIONS  
•
8-Channel Complete Analog Front-End  
LNA, VCAT, PGA, LPF, ADC, and CW Mixer  
•
Medical Ultrasound Imaging  
–
•
Nondestructive Evaluation Equipments  
DESCRIPTION  
•
Programmable Gain Low-Noise Amplifier  
(LNA)  
The AFE5808 is a highly integrated Analog Front-End  
(AFE) solution specifically designed for ultrasound  
systems in which high performance and small size  
are required. The AFE5808 integrates a complete  
–
–
–
–
24/18/12 dB Gain  
0.25/0.5/1 VPP Linear Input Range  
0.63/0.7/0.9 nV/rtHz Input Referred Noise  
Programmable Active Termination  
time-gain-control (TGC) imaging path and  
a
continuous wave Doppler (CWD) path. It also enables  
users to select one of various power/noise  
combinations to optimize system performance.  
Therefore, the AFE5808 is a suitable ultrasound  
analog front end solution not only for high-end  
systems, but also for portable ones.  
•
40 dB Low Noise Voltage Controlled  
Attenuator (VCAT)  
•
•
24/30 dB Programmable Gain Amplifier (PGA)  
3rd Order Linear Phase Low-Pass Filter (LPF)  
The AFE5808 contains eight channels of voltage  
controlled amplifier (VCA), 14/12-bit Analog-to-Digital  
Converter (ADC), and CW mixer. The VCA includes  
Low noise Amplifier(LNA), Voltage controlled  
–
10, 15, 20, 30 MHz  
•
•
14-bit Analog to Digital Converter (ADC)  
–
–
77 dBFS SNR at 65 MSPS  
LVDS Outputs  
Attenuator(VCAT),  
Programmable  
Gain  
Amplifier(PGA), and Low-Pass Filter (LPF). The LNA  
gain is programmable to support 250 mVPP to 1 VPP  
input signals. Programmable active termination is  
also supported by the LNA. The ultra-low noise VCAT  
provides an attenuation control range of 40dB and  
improves overall low gain SNR which benefits  
harmonic imaging and near field imaging. The PGA  
provides gain options of 24 dB and 30 dB. Before the  
ADC, a LPF can be configured as 10 MHz, 15 MHz,  
20 MHz or 30 MHz to support ultrasound applications  
with different frequencies. The high-performance 14  
bit/65 MSPS ADC in the AFE5808 achieves 77 dBFS  
SNR. It ensures excellent SNR at low chain gain. The  
ADC’s LVDS outputs enable flexible system  
integration desired for miniaturized systems.  
Noise/Power Optimizations (Full Chain)  
–
–
–
153 mW/CH at 0.75 nV/rtHz, 65 MSPS  
98 mW/CH at 1.1 nV/rtHz, 40 MSPS  
80 mW/CH at CW Mode  
•
Excellent Device-to-Device Gain Matching  
±0.5 dB(typical) and ±0.9 dB(max)  
–
•
•
•
Low Harmonic Distortion  
Fast and Consistent Overload Recovery  
Passive Mixer for Continuous Wave  
Doppler(CWD)  
–
Low Close-in Phase Noise –156 dBc/Hz at 1  
KHz off 2.5 MHz Carrier  
–
–
–
–
Phase Resolution of 1/16λ  
Support 16X, 8X, 4X and 1X CW Clocks  
12dB Suppression on 3rd and 5th Harmonics  
Flexible Input Clocks  
•
Small Package: 15 mm x 9 mm, 135-BGA  
NOTE  
AFE5808A is an enhanced version of AFE5808 and it is recommended for new designs.  
Compared to AFE5808, it expands the cut-off frequency range of the digital high pass  
filter; increases the handling capability of extreme overload signals; lowers the correlated  
noise significantly when high impedance source appears.  
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.  
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 © 2010–2012, Texas Instruments Incorporated  
 
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