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AFE5809ZCF Datasheet(PDF) 65 Page - Texas Instruments

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No. de pieza AFE5809ZCF
Descripción Electrónicos  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
PDF  90 Pages
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

AFE5809ZCF Datasheet(HTML) 65 Page - Texas Instruments

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M
M
DC Removal Block
Down Conversion
(I Phase)
Down Conversion
(Q Phase)
Decimator
Decimation
Filter
Down
Sampler
Decimator
Down
Sampler
Decimation
Filter
To Channel
Multiplexing
To Channel
Multiplexing
Channel A
A.I
A.Q
AFE5809
www.ti.com
SLOS738C – SEPTEMBER 2012 – REVISED JANUARY 2013
Figure 85. Digital Demodulator Block
1. DC Removal Block is used to remove DC offset. An offset value can be given to specific register.
2. Down Conversion or Demodulation of signal is done by multiplying signal by cos(
ω0t) and by -sin(ω0t) to give
out I phase and Q phase respectively. cos(
ωt) and -sin(ωt) are 14-bit wide plus a sign bit. ω = 2πf, f can be
set with resolution Fs /216, where Fs is the ADC sampling frequency.
NOTE
The digital demodulator is based on a conventional down converter, that is, -sin(
ω0t) is
used for Q phase.
3. Decimator Block has two functions, Decimation Filter and Down Sampler. Decimation Filter is a variable
coefficient symmetric FIR filter and it's coefficients can be given using Coefficient RAM. Number of taps of
FIR filter is 16 x decimation factor (M). For decimation factor of M, 8M coefficients have to be stored in
Coefficient Bank. Each coefficient is 14 bit wide. Down-sampler gives out 1 sample followed by M-1 samples
zeros.
4. In Figure 86, channel multiplexing is implemented for flexible data routing. :
Copyright © 2012–2013, Texas Instruments Incorporated
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