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FS6370

Table 8: PLL Tuning Bits

Name

Description

Loop Filter Time Constant A

Bit = 0

Short time constant: 7

µs

LFTC_A

(Bit 20)

Bit = 1

Long time constant: 20 µs

Loop Filter Time Constant B

Bit = 0

Short time constant: 7

µs

LFTC_B

(Bit 44)

Bit = 1

Long time constant: 20 µs

Loop Filter Time Constant C1 - Selected when the SEL_CD pin = 0

Bit = 0

Short time constant: 7

µs

LFTC_C1

(Bit 68)

Bit = 1

Long time constant: 20 µs

Loop Filter Time Constant C2 - Selected when the SEL_CD pin = 1

Bit = 0

Short time constant: 7

µs

LFTC_C2

(Bit 92)

Bit = 1

Long time constant: 20 µs

Charge Pump A

Bit = 0

Current = 2 µA

CP_A

(Bit 19)

Bit = 1

Current = 10 µA

Charge Pump B

Bit = 0

Current = 2 µA

CP_B

(Bit 43)

Bit = 1

Current = 10 µA

Charge Pump C1 - Selected when the SEL_CD pin = 0

Bit = 0

Current = 2 µA

CP_C1

(Bit 67)

Bit = 1

Current = 10 µA

Charge Pump C2 - Selected when the SEL_CD pin = 1

Bit = 0

Current = 2 µA

CP_C2

(Bit 91)

Bit = 1

Current = 10 µA

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