lm49350rl National Semiconductor Corporation, lm49350rl Datasheet - Page 36

• Manufacturer Part Number: lm49350rl
• Description: High Performance Audio Codec Sub-system With A Ground-referenced Stereo Headphone Amplifier & An Ultra Low Emi Class D Loudspeaker Amplifier With Dual I2s/pcm Digital Audio Interfaces
• Manufacturer: National Semiconductor Corporation

www.national.com
19.0 PLL Setup Registers
The LM49350 contains two PLLs for flexible operation of its dual audio ports. PLL1 has a P1 and P2 output divider thereby allowing
PLL1 to generate two distinct clock outputs. The equations for PLL1's generated output clocks are as follows:
where:
The equations for PLL2's generated output clock are as follows:
where:
f
f
N
M
P
P
f
N
M
P = (PLL2_P + 1) / 2
OUT1
OUT2
OUT3
1
2
1
2
1
2
= (PLL1_P1 + 1) / 2
= (PLL1_P2 + 1) / 2
= PLL1_N + PLL1_N_MOD
= PLL2_N + PLL2_N_MOD
= (PLL1_M + 1) / 2
= (PLL2_M + 1) / 2
= (f
= (f
= (f
IN
IN
IN
.N
. N
. N
2
1
1
/ M
/ M
/ M
2
.P)
1
1
. P
. P
1
2
)
)
FIGURE 13: PLL1 Loop
FIGURE 14: PLL2 Loop
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