STW81200 datasheet(35/58 Pages) STMICROELECTRONICS

부품명	STW81200

상세설명	Wideband RF PLL fractional/integer frequency synthesizer with integrated VCOs and LDOs

PDF	58 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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35 / 58 page

DocID025943 Rev 7

35/58

STW81200

Circuit description

7.15

STW81200 register descriptions

ST0 Register

Address:

STW81200BaseAddress + 0x00

Type:

R/W

Description:

Master register. N divider, CP current

765

4321

[26]

RESERVED: must be set to ‘0’

[25:21]

CP_SEL: Set Charge Pump pulse current value (0 to 4.9 mA; step ~158

μA)

00000: (0) set ICP=0

00001: (1) set ICP=158

μA

00010: (2) set ICP=316

μA

…

11110: (30) set ICP=4.74 mA

11111: (31) set ICP=4.90 mA

[20:19]

PFD_DEL: Set PFD anti-backlash delay / down-split current value

00: (0) 1.2 ns / 0 A (default)

01: (1) 1.9 ns / 0.25*ICP

10: (2) 2.5 ns / 0.5*ICP

11: (3) 3.0 ns / 0.75*ICP

[18]

RESERVED: must be set to ‘0’

[17]

RESERVED: must be set to ‘0’

[16:0]

N: Set integer part of N divider ratio (NINT)

For NINT ≥ 512, fractional mode is not allowed (FRAC and MOD settings are ignored)

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