wm9081 Wolfson Microelectronics plc, wm9081 Datasheet - Page 70

• Manufacturer Part Number: wm9081
• Description: Mono Dac With 2.6w Class Ab/d Speaker Driver, Dynamic Range Controller And Retune Mobile Parametric Equalizer
• Manufacturer: Wolfson Microelectronics plc

WM9081
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The register fields that control the FLL are described in Table 42. Example settings for a variety of
reference frequencies and output frequencies are shown in Table 43.
R16 (10h)
FLL Control 1
R17 (11h)
FLL Control 2
R18 (12h)
FLL Control 3
R19 (13h)
FLL Control 4
REGISTER
ADDRESS
10:8
15:0
14:5
BIT
6:4
2:0
3
2
0
FLL_HOLD
FLL_FRAC
FLL_ENA
FLL_OUTDIV
[2:0]
FLL_CTRL_RAT
E [2:0]
FLL_FRATIO
[2:0]
FLL_K[15:0]
FLL_N[9:0]
LABEL
0000_0000
00_0001_0
DEFAULT
_0000_
010
000
000
0000
0
0
0
000
FLL Hold Select
0 = Disabled
1 = Enabled
This feature enables free-running mode
in FLL when reference clock is removed
Fractional enable
0 = Integer Mode
1 = Fractional Mode
Fractional Mode is recommended in all
cases
FLL Enable
0 = Disabled
1 = Enabled
F
000 = 2
001 = 4
010 = 8
011 = 16
100 = 32
101 = 64
110 = 128
111 = 256
(F
Frequency of the FLL control block
000 = F
001 = F
010 = F
011 = F
100 = F
101 = F
110 = F
111 = F
Recommended that this register is not
changed from default.
F
000 = 1
001 = 2
010 = 4
011 = 8
1XX = 16
000 recommended for high F
011 recommended for low F
Fractional multiply for F
(MSB = 0.5)
Integer multiply for F
(LSB = 1)
OUT
VCO
OUT
clock divider
clock divider
= F
VCO
VCO
VCO
VCO
VCO
VCO
VCO
VCO
VCO
PP, Rev 3.0, April 2009
DESCRIPTION
/ 1 (Recommended value)
/ 2
/ 3
/ 4
/ 5
/ 6
/ 7
/ 8
/ FLL_OUTDIV)
Pre-Production
REF
REF
REF
REF
70