LM49352RLX/NOPB National Semiconductor, LM49352RLX/NOPB Datasheet - Page 40

• Manufacturer Part Number: LM49352RLX/NOPB
• Description: IC AMP AUDIO MONO D1.4W 36USMD
• Manufacturer: National Semiconductor
• Series: Boomer®, PowerWise®r
• Type: Class Dr

Specifications of LM49352RLX/NOPB

• Output Type: 1-Channel (Mono) with Mono and Stereo Headphones
• Max Output Power X Channels @ Load: 1.4W x 1 @ 8 Ohm; 65mW x 2 @ 32 Ohm
• Features: Depop, Differential Inputs, I²C, I²S, Microphone, Shutdown, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 36-MicroSMDxt
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Other names: LM49352RLX

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18.0 PLL Setup Registers
The LM49352 contains a PLL for flexible operation of its dual audio ports. The PLL has a P1 and P2 output divider thereby allowing
the PLL to generate two distinct clock outputs. The equations for the PLL's generated output clocks are as follows:
where:
The VCO frequency and comparison frequencies are as follows:
Keep f
f
f
N = PLL_N + PLL_N_MOD
M = (PLL_M + 1) / 2
P
P
f
f
OUT1
OUT2
VCO
COMP
1
2
= (PLL_P1 + 1) / 2
= (PLL_P2 + 1) / 2
f
VCO
= f
IN
12.288
= (f
= (f
19.68
= f
14.4
16.2
16.8
19.2
19.8
14.4
(MHz)
12
13
26
27
12
13
OUT
between 140MHz to 240MHz and keep f
IN
IN
IN
/M
.P
. N / M . P
. N / M . P
1
2
)
)
15.5
12.5
13.5
12.5
20.5
16.5
32.5
22.5
12.5
12.5
2.5
3.5
10
M
9
TABLE 8. PLL Settings for Common System Clock Frequencies
175
128
128
160
128
192
128
147
147
144
147
32
32
96
N
N_MOD
COMP
FIGURE 13. PLL Loop
26
19
0
0
0
0
0
0
0
0
0
0
0
0
between 700KHz to 5MHz.
40
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
18.5
12
12
12
16
15
P
12288000
12287970
12288000
12288000
12288000
12288000
12288000
12288000
12288000
12288000
11289600
11289600
11289603
11289600
f
OUT
(Hz)
Error (Hz)
30072730
–30
+3
0
0
0
0
0
0
0
0
0
0
0
0