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PCM1802 数据表(PDF) 12 Page - Texas Instruments

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部件名 PCM1802
功能描述  SINGLE-ENDED ANALOG-INPUT 24-BIT, 96-kHz STEREO A/D CONVERTER
PDF  24 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

PCM1802 数据表(HTML) 12 Page - Texas Instruments

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PCM1802
SLES023B – DECEMBER 2001 – REVISED MARCH 2002
12
www.ti.com
PRINCIPLES OF OPERATION
VINL
1
3
4
VREF1
VREF2
0.1
µF
1
µF
20 k
Ω
+
–
+
–
Delta-Sigma
Modulator
(+)
(–)
Reference
5
VCC
+
10
µF
Figure 20. Analog Front End (Left Channel)
1st
SW-CAP
Integrator
Analog
In
X(z)
+
–
+
–
2nd
SW-CAP
Integrator
3rd
SW-CAP
Integrator
+
–
4th
SW-CAP
Integrator
+
+
+
+
+
+
+
+
5th
SW-CAP
Integrator
Digital
Out
Y(z)
Comparator
Qn(z)
H(z)
1-Bit
DAC
STF(z) = H(z) / [1 + H(z)]
NTF(z) = 1 / [1 + H(z)]
Y(z) = STF(z) * X(z) + NTF(z) * Qn(z)
Signal Transfer Function
Noise Transfer Function
Figure 21. Block Diagram of Fifth-Order Delta-Sigma Modulator



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