NAU8812EVB Nuvoton Technology Corporation of America, NAU8812EVB Datasheet - Page 45

• Manufacturer Part Number: NAU8812EVB
• Description: BOARD EVAL FOR NAU8812
• Manufacturer: Nuvoton Technology Corporation of America
• Series: emPowerAudio™r

Specifications of NAU8812EVB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MCLK
(MHz)
12.0
12.0
14.4
14.4
19.2
19.2
19.8
19.8
24.0
24.0
26.0
26.0
To complete this portion of the design example, the integer portion of the multiplier is truncated to the value, 8 and
the fractional portion is multiplied by 2
this is: (2
It is best to round this value to the nearest whole value of 3221225, or hexadecimal 0x3126E9.
Below are additional examples of results for this calculation applied to commonly available clock frequencies and
desired IMCLK 256fs sample rates.
emPowerAudio
Datasheet Revision 2.0
11.28960
12.28800
11.28960
12.28800
11.28960
12.28800
11.28960
12.28800
11.28960
12.28800
11.28960
12.28800
Desired
Output
(MHz)
24
)(0.192) = 3221225.472.
™
Frequency
MCLK/1
MCLK/1
MCLK/1
MCLK/1
MCLK/2
MCLK/2
MCLK/2
MCLK/2
MCLK/2
MCLK/2
MCLK/2
MCLK/2
Input
(f
1
)
90.3168
98.3040
90.3168
98.3040
90.3168
98.3040
90.3168
98.3040
90.3168
98.3040
90.3168
98.3040
(MHz)
f
2
24
Table 25: PLL Frequency Examples
, as to create the needed 24-bit binary fractional value. The calculation for
Divider
MCLK
f
f
f
f
f
f
f
f
f
f
f
f
PLL
PLL
PLL
PLL
PLL
PLL
PLL
PLL
PLL
PLL
PLL
PLL
bits
/2
/2
/2
/2
/2
/2
/2
/2
/2
/2
/2
/2
Page 45 of 109
10.240000
7.526400
8.192000
6.272000
6.826667
9.408000
9.122909
9.929697
7.526400
8.192000
6.947446
7.561846
R
(Hex)
10
N
7
8
6
6
9
9
9
7
8
6
7
45A1CA
D3A06D
3D70A3
EE009E
F28BD4
8FD526
86C226
3126E9
6872B0
1F76F8
86C226
3126E9
K (Hex)
PLLK[23:18]
0C
1A
3B
0C
3C
21
11
34
0F
07
21
23
Actual Register Setting
NAU8812
January 2011
PLLK[17:9]
1BB
1EA
1D0
161
100
161
145
D0
B8
93
39
93
PLLK[8:0]
1CA
1D4
126
E9
6D
B0
A3
9E
E9
26
F8
26