AFE5808A datasheet(54/66 Pages) TI1

No de pièce	AFE5808A

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

PDF	66 Pages

Scroll/Zoom	100%

Fabricant	TI1 [Texas Instruments]

Site Internet	http://www.ti.com

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54 / 66 page

S0501-01

I/VSum

Amp

CW_AMPINP

CW_OUTM

CW_AMPINM

CW_OUTP

EXT

INT

2000Ω

1000Ω

500Ω

250Ω

AFE5808A

SLOS729B – OCTOBER 2011 – REVISED APRIL 2012

www.ti.com

Figure 87. CW Summing Amplifier Block Diagram

Multiple AFE5808As are usually utilized in parallel to expand CW beamformer channel count. These AFE5808As’

CW outputs can be summed and filtered externally further to achieve desired gain and filter response. AC

coupling capacitors CAC are required to block DC component of the CW carrier signal. CAC can vary from 1 µF to

10s

μF depending on the desired low frequency Doppler signal from slow blood flow. Multiple AFE5808As’ I/Q

outputs can be summed together with a low noise external differential amplifiers before 16/18-bit differential

audio ADCs. TI’s ultralow noise differential precision amplifier OPA1632 and THS4130 are suitable devices.

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AFE5808A Fiches technique(PDF) 54 Page - Texas Instruments