STW81102 datasheet(27/43 Pages) STMICROELECTRONICS

tên linh kiện	STW81102

Giải thích chi tiết về linh kiện	Multi-band RF frequency synthesizer with integrated VCOs

PDF	43 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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STW81102

I2C bus interface

27/43

5.3.2

B_COUNTER

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

5.3.3

A_COUNTER

Bits B[2:0] for B Counter, A Counter value.

5.3.4

REF_DIVIDER

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

5.3.5

CONTROL

The CONTROL register is used to set the Charge Pump current, the VCO output voltage

amplitude and the Prescaler Modulus.

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)

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

according to the following formula:

MSB

LSB

B10

B9B8

B7B6B5

B4B3

MSB

LSB

MSB

LSB

MSB

LSB

PLL_

SEL2

SEL1

SEL0

PSC_

SEL

OUT

⋅

()

REF_CLK

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

⋅⋅

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