ak4141 AKM Semiconductor, Inc., ak4141 Datasheet - Page 82

• Manufacturer Part Number: ak4141
• Description: Nicam/a2/eia-j Digital Stereo Decoder
• Manufacturer: AKM Semiconductor, Inc.

CR2N [15:0]
CR2Q[15:0]: Carrier 2 quality.
MS0952-E-00
Addr
Addr
70H
71H
72H
73H
Carrier 1 average magnitude noise. An FM carrier has a constant magnitude. This is a measure of its average
difference from its average.
When reading these registers, always read the high byte first. The low byte is only updated when the high byte is
read. This ensures that the values read from the two registers come from the same 16-bit word.
This is the ratio of CR2M to CR2N. This is an approximation of S/N ratio.
When reading these registers, always read the high byte first. The low byte is only updated when the high byte is
read. This ensures that the values read from the two registers come from the same 16-bit word.
CR2N
CR1Q =
[15:0] = Portion of full scale x 1.647
Carrier 2 Magnitude Noise 1
Carrier 2 Magnitude Noise 0
Carrier 2 Signal Quality 1
Carrier 2 Signal Quality 0
CR1M
Register Name
Register Name
Default
Default
R/W
R/W
/
CR2Q [15:0]
CR2N[15:8]
CR1N
0xAD9B
0x2B9C
0x15DB
0x0AF4
0x057D
0xFFFF
0x02C0
0x00B1
0x002C
0x000B
0x5702
0x0161
0x0059
0x0016
0x4000
0x1000
0x0400
0x0100
0x0040
0x0010
0x0004
x 2
6
(unsigned)
Table 100. Carrier 2 average magnitude noise
Average Carrier Magnitude Noise (dBFS)
Table 101. Carrier 2 quality
Ratio of CR2M to CR2N (dB)
2
* 2
D7
D7
14
(unsigned)
- 82 -
>60
-12
-18
-24
-30
-36
-42
-48
-54
-60
-66
-72
-12
-24
48
36
24
12
-6
D6
D6
0
0
D5
D5
CR2N[15:8]
CR2Q[15:8]
CR2N[7:0]
CR2Q[7:0]
00000000
00000000
D4
D4
RD
RD
D3
D3
D2
D2
D1
D1
[AK4141]
2008/05
D0
D0