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AFE5807_14

更新时间： 2024-09-19 02:58:19
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71页 1091K
描述
Fully Integrated, 8-Channel Ultrasound Analog Front End with Passive CW Mixer, 1.05 nV/rtHz, 12-Bit, 80 MSPS, 117 mW/CH

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AFE5807  
www.ti.com  
SLOS703B –SEPTEMBER 2010–REVISED APRIL 2012  
Fully Integrated, 8-Channel Ultrasound Analog Front End with  
Passive CW Mixer,  
1.05 nV/rtHz, 12-Bit, 80 MSPS, 117 mW/CH  
Check for Samples: AFE5807  
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 AFE5807 is an integrated Analog Front-End  
(AFE) solution specifically designed for ultrasound  
systems in which high performance and small size  
are required. The AFE5807 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 IRN (Low Noise Mode)  
0.99/1.0/1.05 nV/rtHz IRN (Low Power Mode)  
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 AFE5807 is a suitable ultrasound  
analog front end solution not only for high-end  
systems, but also for portable systems.  
•
40 dB Low Noise Voltage Controlled  
Attenuator (VCAT)  
•
•
24/30 dB Programmable Gain Amplifier (PGA)  
3rd Order Linear Phase Low-Pass Filter (LPF)  
The AFE5807 contains eight channels of voltage  
controlled amplifier (VCA), 12-bit Analog-to-Digital  
Converter (ADC), and CW mixer. The VCA includes  
Low noise Amplifier (LNA), Voltage controlled  
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 40 dB 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 12  
bit/80 MSPS ADC in the AFE5807 achieves 70 dBFS  
SNR. It ensures excellent SNR at low chain gain. The  
ADC’s LVDS outputs enable flexible system  
integration desired for miniaturized systems. The  
AFE5807 also integrates a low power passive mixer  
and a low noise summing amplifier to accomplish on-  
chip CWD beamformer. 16 selectable phase-delays  
can be applied to each analog input signal.  
Meanwhile a unique 3rd and 5th order harmonic  
suppression filter is implemented to enhance CW  
sensitivity.  
–
10, 15, 20, 30 MHz  
•
•
12-bit Analog to Digital Converter (ADC)  
–
–
70 dBFS SNR at 80 MSPS  
LVDS Outputs  
Noise/Power Optimizations (Full Chain)  
–
–
–
117 mW/CH at 1.05 nV/rtHz, 80 MSPS  
159 mW/CH at 0.75 nV/rtHz, 80 MSPS  
80 mW/CH at CW Mode  
•
Excellent Device-to-Device Gain Matching  
±0.5 dB(typical) and ±1 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  
The AFE5807 is available in a 15mm × 9mm, 135-pin  
BGA package and it is specified for operation from  
0°C to 85°C. It is also pin-to-pin compatible to the  
AFE5808, AFE5803, and AFE5808A.  
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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