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WM8945ECS/R датащи(PDF) 70 Page - Wolfson Microelectronics plc

номер детали WM8945ECS/R
подробное описание детали  Mono Low-Power CODEC with Video Buffer and Touch Panel Controller
PDF  169 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8945ECS/R датащи(HTML) 70 Page - Wolfson Microelectronics plc

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WM8945
Production Data
w
PD, May 2011, Rev 4.1
70
u-law Companding
0
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120
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Normalised Input
0
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Figure 28 µ-Law Companding
A-law Companding
0
20
40
60
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120
0
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1
Normalised Input
0
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Figure 29 A-Law Companding
The companded data is also inverted as recommended by the G.711 standard (all 8 bits are inverted
for
-law, all even data bits are inverted for A-law). Companded data is transmitted in the first 8 MSBs
of its respective data word, and consists of sign (1 bit), exponent (3 bits) and mantissa (4 bits), as
shown in Table 46.
BIT7
BIT[6:4]
BIT[3:0]
SIGN
EXPONENT
MANTISSA
Table 46 8-bit Companded Word Composition
8-bit mode is selected whenever DAC_COMP=1 or ADC_COMP=1. The use of 8-bit data allows
samples to be passed using as few as 8 BCLK cycles per Left/Right Clock frame. When using DSP
mode B, 8-bit data words may be transferred consecutively every 8 BCLK cycles.



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