STW81101ATR datasheet(30/48 Pages) STMICROELECTRONICS

30 / 48 page

I2C bus interface

STW81101

30/48

B_COUNTER

B[10:3]. Counter value (bit B11 in the previous register, bits B[2:0] in the next register)

A_COUNTER

Bits B[2:0] for B_COUNTER, A_COUNTER value.

REF_DIVIDER

Reference clock divider ratio R[9:1] (bits R1, R0 in the next register).

CONTROL

The CONTROL register is used to set the charge pump current, the VCO output voltage

amplitude and the prescaler modulus:

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

according to the following formula:

MSB

LSB

B10

B9B8B7

B6B5B4

MSB

LSB

MSB

LSB

MSB

LSB

PLL_A1

PLL_A0

CPSEL2

CPSEL1

CPSEL0

PSC_SEL

PLL_A[1:0]:

VCO amplitude

CPSEL[2:0]:

charge pump output current

PSC_SEL:

prescaler modulus select ('0' for P=16, '1' for P=19)

where

DR equals

{

for direct output

0.5

for output divided by 2

0.25 for output divided by 4

OUT

()

REF

CLK

–

-----------------------------------

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