STW81200 datasheet(8/58 Pages) STMICROELECTRONICS

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Pin definitions

STW81200

8/58

DocID025943 Rev 7

Table 2. Pin description

Pin No

Name

Description

Observation

CBYP_4V5

Connection for 4.5 V regulator

bypass capacitor

2VREG_4V5

Regulated output voltage for 4.5V

regulator

Adjustable output voltage: 5.0 V, 4.5 V,

2.6 V, 3.3 V

VCC_VCO_Core

Supply voltage for VCO Core

Must be connected to VREG_4V5 or

VREG_VCO

HW_PD

HW Power Down

CMOS Schmitt Triggered Input, 1.8 V

compatible, 3.3 V tolerant

PD_RF1

RF1 output stage Power Down

control

CMOS Schmitt Triggered Input, 1.8 V

compatible, 3.3 V tolerant

PD_RF2/FL_SW

RF2 output stage Power Down

Control / Fast Lock switch

CMOS Schmitt Triggered Input, 1.8 V

compatible, 3.3V tolerant (with Fast lock

feature disabled); High impedance/

GND shorted output (with Fast Lock

feature enabled)

CBYP

Connection for VCO circuitry

regulator bypass capacitor

8VREG_VCO

Regulated output voltage for VCO

circuitry regulator

VIN_LDO_VCO

Supply voltage for VCO circuitry

regulator

Connection for reference voltage

filtering capacitor

VCTRL

VCO control voltage

EXTVCO_INP

External VCO positive input

This pin must be connected to ground if

external VCO is not used

EXTVCO_INN

External VCO negative input

This pin must be connected to ground if

external VCO is not used

VDD_CP

Supply voltage for Charge Pump

bias

This pin must be connected to

VREG_VCO

ICP

PLL charge pump output

VCC_CPOUT

Supply voltage for Charge Pump

output stage

This pin must be connected to

VREG_4V5 or VREG_VCO

VDD_PFD

Supply voltage for PFD

This pin must be connected to

VREG_REF

VIN_LDO_REF

Supply voltage for PLL regulator

VREG_REF

Regulated output voltage for

Reference Clock regulator

REF_CLKN

Reference clock negative input

REF_CLKP

Reference clock positive input

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