WM8941GEFL/RV Wolfson Microelectronics, WM8941GEFL/RV Datasheet - Page 67

• Manufacturer Part Number: WM8941GEFL/RV
• Description: Audio CODECs Mono CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8941GEFL/RV

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-28
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pre Production
w
Table 52 8-bit Companded Word Composition
Figure 39 u-Law Companding
Figure 40 A-Law Companding
Companding converts 13 bits (µ-law) or 12 bits (A-law) to 8 bits using non-linear quantization. The
input data range is separated into 8 levels, allowing low amplitude signals better precision than that
of high amplitude signals. This is to exploit the operation of the human auditory system, where
louder sounds do not require as much resolution as quieter sounds. The companded signal is an 8-
bit word containing sign (1-bit), exponent (3-bits) and mantissa (4-bits).
SIGN
BIT7
120
100
120
100
80
60
40
20
80
60
40
20
0
0
0
0
0.1
EXPONENT
0.2
0.2
BIT[6:4]
0.3
u-law Companding
A-law Companding
0.4
Normalised Input
0.4
Normalised Input
0.5
0.6
0.6
0.7
MANTISSA
BIT[3:0]
0.8
0.8
PP, Rev 3.3, December 2007
0.9
1
1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
WM8941
67