AFE5812_15 datasheet(38/109 Pages) TI

Part #	AFE5812

Description	AFE5812 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, 180 mW/CH

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Manufacturer	TI [Texas Instruments]

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1

T

16

I/Q CLK

Generator

4X/8X Clock

D Q

INV

1X Clock

LNA1

Weight

LNA2~8

In-phase

CLK

Quadrature

CLK

I/V

Summed

In-Phase

Summed

Quadrature

AFE5812

SLOS816A – MARCH 2015 – REVISED MARCH 2015

www.ti.com

Figure 71. 8 × ƒcw and 4 × ƒcw Block Diagram

Figure 72. 8 × ƒcw and 4 × ƒcw Timing Diagram

10.3.5.3 1 × ƒcw Mode

The 1 × ƒcw mode requires in-phase and quadrature clocks with low phase noise specifications. The

phase

delay resolution is also achieved by weighting the in-phase and quadrature signals as described in the 8 × ƒcw

and 4 × ƒcw modes.

38

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