FS6131 datasheet(18/44 Pages) ONSEMI

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FS6131

Table 5: LOCK/IPRG Pin Configuration Bits

Name

Description

Crystal Loop Lock STATus Mode /

Main Loop Phase Align STATus mode

(see also Table 6)

Bit 63 = 0

Bit 62 = 0

Crystal Loop Lock status:

Locked or Unlocked

Bit 63 = 0

Bit 62 = 1

Crystal Loop Lock status:

Out of Range High or Low

Bit 63 = 1

Bit 62 = 0

Main Loop Phase Align status

STAT[1:0]

(Bits 63-62)

Bit 63 = 1

Bit 62 = 1

Feedback Divider output

Table 6: Lock Status

CMOS

STAT [1]

STAT [0]

LOCK /

IPRG PIN

STAT[1]

Read

Status

Locked

Unlocked

Out-of-Range: Low

Out-of-Range: High

Table 7: Main Loop Tuning Bits

Name

Description

VCO SPeeD range select (see Table 16)

Bit = 0

High Speed Range

VCOSPD

(Bit 44)

Bit = 1

Low Speed Range

Main Loop Charge Pump current

Bit 41 = 0

Bit 40 = 0

Current = 1.5

μA

Bit 41 = 0

Bit 40 = 1

Current = 5

μA

Bit 41 = 1

Bit 40 = 0

Current = 8

μA

MLCP[1:0]

(Bits 41-40)

Bit 41 = 1

Bit 40 = 1

Current = 24

μA

Loop Filter Time Constant (internal)

Bit = 0

Short Time Constant: 13.5

μs

LFTC

(Bit 43)

Bit = 1

Long Time Constant: 135

μs

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