Data Sheet
FS6377-01/FS6377-01g Programmable 3-PLL Clock Generator IC
Table 8. PLL Tuning Bits
Table 9. Mux Select Bits
Name
Description
MUX A Frequency Select
Name
Description
Loop Filter Time Constant A
Bit = 0
Bit = 1
Short time constant: 7µs
Long time constant: 20µs
LFTC_A
(Bit 20)
Bit 23
Bit 22
0
0
1
1
0
1
0
1
Reference frequency
Loop Filter Time Constant B
MUX_A[1:0]
(Bits 23-22)
PLL A frequency
PLL B frequency
PLL C frequency
Bit = 0
Bit = 1
Short time constant: 7µs
Long time constant: 20µs
LFTC_B
(Bit 44)
Loop Filter Time Constant C1
selected when the SEL_CD pin = 0
MUX B Frequency Select
Bit = 0
Bit = 1
Short time constant: 7µs
Long time constant: 20µs
LFTC_C1
(Bit 68)
Bit 47
Bit 46
0
0
1
1
0
1
0
1
Reference frequency
PLL A frequency
PLL B frequency
PLL C frequency
Loop Filter Time Constant C2
selected when the SEL_CD pin = 1
MUX_B[1:0]
(Bits 47-46)
Bit = 0
Short time constant: 7µs
LFTC_C2
(Bit 92)
Bit = 1
Long time constant: 20µs
Charge Pump A
Bit = 0
MUX C1 Frequency Select
selected when the SEL_CD pin = 0
Current = 2µA
Current = 10µA
CP_A
(Bit 19)
Bit 71
Bit 70
Bit = 1
0
0
1
1
0
1
0
1
Reference frequency
PLL A frequency
PLL B frequency
PLL C frequency
Charge Pump B
Bit = 0
MUX_C1[1:0]
(Bits 71-70)
Current = 2µA
Current = 10µA
CP_B
(Bit 43)
Bit = 1
Charge Pump C1
selected when the SEL_CD pin = 0
MUX C2 Frequency Select
selected when the SEL_CD pin = 1
Bit = 0
Current = 2µA
Current = 10µA
CP_C1
(Bit 67)
Bit = 1
Bit 125
Bit 124
Charge Pump C2
selected when the SEL_CD pin = 1
0
0
1
1
0
1
0
1
Reference frequency
PLL A frequency
PLL B frequency
PLL C frequency
MUX_C2[1:0]
(Bits 125-124)
Bit = 0
Bit = 1
Current = 2µA
Current = 10µA
CP_C2
(Bit 91)
MUX D1 Frequency Select
selected when the SEL_CD pin = 0
Bit 95
Bit 94
0
0
1
1
0
1
0
1
Reference frequency
PLL A frequency
PLL B frequency
PLL C frequency
MUX_D1[1:0]
(Bits 95-94)
MUX D2 Frequency Select
selected when the SEL_CD pin = 1
Bit 127
Bit 126
0
0
1
1
0
1
0
1
Reference frequency
PLL A frequency
PLL B frequency
PLL C frequency
MUX_D2[1:0]
(Bits 127-126)
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