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AFE5808ZCF Datasheet(PDF) 60 Page - Texas Instruments

Part # AFE5808ZCF
Description  Fully Integrated, 8-Channel Ultrasound Analog Front End With Passive CW Mixer, 0.75 nV/rtHz, 14/12-Bit, 65 MSPS, 153 mW/CH
PDF  75 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

AFE5808ZCF Datasheet(HTML) 60 Page - Texas Instruments

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S0502-01
500
I/VSum
Amp
Cext
Cext
Rint/Rext
Rint/Rext
CW_OUTM
CW_OUTP
ExtSum
Amp
LNA1
INM1
LNA2
INM2
LNA8
INM8
CWIorQCHANNEL
Structure
INPUT1
INPUT2
INPUT8
AFENo.2
AFENo.3
AFENo.4
AFENo.1
CW_AMPINP
CW_AMPINM
Mixer 1
Clock
Mixer 2
Clock
Mixer 8
Clock
ACT1
ACT2
ACT8
C
AC
R
SUM
INP1
INP2
INP8
500
500
500
500
500
AFE5808
SLOS688D – SEPTEMBER 2010 – REVISED JANUARY 2014
www.ti.com
Figure 87. CW circuit with Multiple AFE5808s
NOTE
The local oscillator inputs of the passive mixer are cos(
ωt) for I-CH and sin(ωt) for Q-CH
respectively. Depending on users' CW Doppler complex FFT processing, swapping I/Q
channels in FPGA or DSP may be needed in order to get correct blood flow directions.
The CW I/Q channels are well matched internally to suppress image frequency components in Doppler spectrum.
Low tolerance components and precise operational amplifiers should be used for achieving good matching in the
external circuits as well.
CW Clock Selection
The AFE5808 can accept differential LVDS, LVPECL, and other differential clock inputs as well as single-ended
CMOS clock. An internally generated VCM of 2.5 V is applied to CW clock inputs, that is CLKP_16X/ CLKM_16X
and CLKP_1X/ CLKM_1X. Since this 2.5 V VCM is different from the one used in standard LVDS or LVPECL
clocks, AC coupling is required between clock drivers and the AFE5808 CW clock inputs. When CMOS clock is
used, CLKM_1X and CLKM_16X should be tied to ground. Common clock configurations are illustrated in
Figure 88. Appropriate termination is recommended to achieve good signal integrity.
60
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Product Folder Links: AFE5808



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