AFE5809_13 datasheet(78/90 Pages) TI

Part #	AFE5809

Description	Fully Integrated, 8-Channel Ultrasound Analog Front End with Passive CW Mixer, and Digital I/Q Demodulator, 0.75 nV/rtHz, 14, 12-Bit, 65 MSPS, 158 mW/CH

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Manufacturer	TI [Texas Instruments]

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AFE5809

SLOS738C – SEPTEMBER 2012 – REVISED JANUARY 2013

www.ti.com

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.

CW Clock Selection

The AFE5809 can accept differential LVDS, LVPECL, and other differential clock inputs as well as single-ended

CMOS clock. An internally generated VCM of 2.5V 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 AFE5809 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 100. Appropriate termination is recommended to achieve good signal integrity.

78

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