LMK04031BISQ National Semiconductor, LMK04031BISQ Datasheet - Page 38

• Manufacturer Part Number: LMK04031BISQ
• Manufacturer: National Semiconductor

Specifications of LMK04031BISQ

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 48
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

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16.12 REGISTER 15
16.12.1 PLL2_N: PLL2_N Counter
The PLL2_N Counter is 18 bits wide. It divides the output of
the VCO Divider and is connected to the PLL2 Phase Detec-
tor. Each time the PLL2_N Counter value is updated via the
uWire interface, an internal algorithm is triggered that opti-
mizes the VCO performance.
b4 b3 b2 b1 b0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
PLL_MUX [4:0]
TABLE 27. PLL_MUX: LD Pin Selectable Outputs
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0 PLL2 Analog Lock Detect Open Drain
1 PLL2 Analog Lock Detect Open Drain
0
1
0
1
0
1
0 PLL1 Digital Lock Detect Active HIGH
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
PLL1 Digital Lock Detect Active LOW
PLL2 Digital Lock Detect Active High
Inverted PLL1 and PLL2 Digital Lock
PLL2 Digital Lock Detect Active Low
PLL2 Analog Lock Detect Push Pull
PLL1 and PLL2 Digital Lock Detect
PLL2_N Divider Output / 2
PLL2_R Divider Output / 2
PLL1_N Divider Output / 2
PLL1_R Divider Output / 2
LD Output
Logic High
Logic Low
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
NMOS
PMOS
Detect
HiZ
38
16.12.2 PLL2_CP_GAIN: PLL2 Charge Pump Current and
Output Control
The PLL2 charge pump output current level is controlled with
the PLL2_CP_GAIN register. The following table presents the
charge pump current control values.
16.12.3 VCO_DIV: PLL2 VCO Divide Register
A divider is provided on the output of the PLL2 VCO to enable
a wide range of output clock frequencies. The output of this
divider is placed on the input path for the clock distribution
section, which feeds each of the individual clock channels.
The divider provides integer divide ratios from 2 to 8.
TABLE 29. PLL2_CP_GAIN: PLL2 Charge Pump Current
b17 b16
0
0
0
1
PLL2_CP_GAIN [1:0]
b3
TABLE 30. VCO_DIV: PLL2 VCO Divider Values
0
0
0
0
0
0
0
0
1
b1
TABLE 28. PLL2_N: PLL2_N Counter Values
X
0
0
1
1
0
0
0
1
...
...
VCO_DIV [3:0]
b2
0
0
0
0
1
1
1
1
0
b6 b5 b4 b3 b2 b1 b0
0
0
0
1
.
N [17:0]
b0
X
0
1
0
1
0
0
0
1
.
Selections
0
0
0
1
.
b1
0
0
1
1
0
0
1
1
0
0
0
0
1
.
CP_TRI
0
0
0
1
.
1
0
0
0
0
0
0
1
1
b0
.
0
1
0
1
0
1
0
1
0
0
1
0
1
.
Current (µA)
Charge
Pump
Not Valid
1600
3200
Hi-Z
VALUE
262143
100
400
Divide
Invalid
Invalid
Value
...
2
3
4
5
6
7
8
1
2