lm49370rl National Semiconductor Corporation, lm49370rl Datasheet - Page 26

• Manufacturer Part Number: lm49370rl
• Description: Audio Sub-system With An Ultra Low Emi, Spread Spectrum, Class D Loudspeaker Amplifier, A Dual-mode Stereo Headphone Amplifier, And A Dedicated Pcm Interface For Bluetooth Transceivers
• Manufacturer: National Semiconductor Corporation

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Bits
4:0
6:5
12.8 PLL N MODULUS CONFIGURATION REGISTER
This register is used to control the modulation applied to the feedback divider of the PLL. (Note 15)
The complete N divider is a fractional divider as such:
If the modulus input is zero then the N divider is simply an integer N divider. The output from the PLL is determined by the following
formula:
Note 15: See Further Notes on PLL Programming for more details.
7
PLL_CLK_SEL
PLL_N_MOD
RSVD
Field
This programs the PLL N divider's fractional component:
This selects the clock to be used as input for the audio PLL.
Reserved.
PLL_N_MOD
TABLE 9. PLL_N_MOD (0x05h)
2 to 30
N = PLL_N + PLL_N_MOD/32
00
01
10
11
31
0
1
2
2
2
2
F
out
= (F
in
26
*N)/(M*P)
PLL_INPUT_CLK
Description
Fractional Addition
PCM_CLK_IN
2/32 to 30/32
I2S_CLK_IN
MCLK
31/32
0/32
1/32
—