STW82103B datasheet(41/67 Pages) STMICROELECTRONICS

Part #	STW82103B

Description	RF down converter with embedded integer-N synthesizer

PDF	67 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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41 / 67 page

STW82103B

I2C bus interface

Doc ID 018517 Rev 2

41/67

CONTROL

PLL control register

Address:

0x04

Type:

Reset:

0x00

Description:

Least significant bits of the reference clock divider ratio value and PLL control bits.

654

3210

[R1:0]

PLL_A[1:0]

CPSEL[2:0]

PSC_SEL

[7:6] R[1:0]: Reference clock divider ratio (bits R[9:2] in the REF_DIVIDER register)

[5:4] PLL_A[1:0]:

VCO amplitude

[3:1] CPSEL[2:0]: Charge Pump output current

[0] PSC_SEL: Prescaler Modulus select (‘0’ for P=16, ‘1’ for P=19)

The LO output frequency is programmed by setting the proper value for A, B and R

according to the following formula

Where:

–DR equals 0.5 for VCOA (VCO output frequency divided by 2) or 1 for VCOB (VCO

output frequency)

– P is the selected Prescaler Modulus

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ref

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STW82103B Datasheet(PDF) 41 Page - STMicroelectronics