FS6131 datasheet(17/44 Pages) ONSEMI

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FS6131

Table 4: Device Configuration Bits

Name

Description

REFerence Divider SouRCe

Bit = 0

Crystal Oscillator (VCXO)

REFDSRC

(Bit 12)

Bit = 1

REF pin

main loop SHUT down select

Bit = 0

Disabled (main loop operates)

SHUT

(Bit 13)

Bit = 1

Enabled (main loop shuts down)

Phase Detector REFerence source

Bit = 0

Reference Divider

PDREF

(Bit 14)

Bit = 1

REF pin

Phase Detector FeedBacK source

Bit = 0

Feedback Divider

PDFBK

(Bit 15)

Bit = 1

FBK pin

FeedBacK Divider SouRCe

Bit 39 = 0

Bit 38 = 0

Post Divider Output

Bit 39 = 0

Bit 38 = 1

FBK pin

Bit 39 = 1

Bit 38 = 0

VCO Output (Post Divider Input)

FBKDSRC[1:0]

(Bits 39-38)

Bit 39 = 1

Bit 38 = 1

FBK pin

EXTernal Loop Filter select

Bit = 0

Internal Loop Filter

EXTLF

(Bit 42)

Bit = 1

EXTLF pin

OSCillator TYPe

Bit = 0

Low Phase Jitter Oscillator

OSCTYPE

(Bit 45)

Bit = 1

FS6031 Compatible Oscillator

OUTput MUltipleXer select

Bit 47 = 0

Bit 46 = 0

Main Loop PLL (VCO Output)

Bit 47 = 0

Bit 46 = 1

Reference Divider Output

Bit 47 = 1

Bit 46 = 0

Phase Detector Input

OUTMUX[1:0]

(Bits 47-46)

Bit 47 = 1

Bit 46 = 1

VCXO Output

clock GobBLer control

Bit = 0

No Clock Phase Adjust

GBL

(Bit 48)

Bit = 1

Clock Phase Delay

CLKP/CLKN output mode

Bit = 0

PECL Output

(positive-ECL output drive)

CMOS

(Bit 60)

Bit = 1

CMOS Output /

Lock Status Indicator

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