STW81103 datasheet(37/53 Pages) STMICROELECTRONICS

Part #	STW81103

Description	Multi-band RF frequency synthesizer with integrated VCOs

PDF	53 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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37 / 53 page

STW81103

SPI digital interface

37/53

7.2

Timing specification

Figure 27.

SPI timing specification

Table 19.

SPI data structure (MSB is sent first)

MSB

LSB

Address

Data for register (24 bits)

D23

D22

D21

D20

D19

D18

D17 D16

D15

D14

D13 D12 D11 D10 D9

Table 20.

Address decoder and outputs

Address

Outputs

DATABITS D23-D0

Name

Function

0024

ST1

Reference divider, VCO amplitude, VCO calibration,

charge pump current, prescaler modulus

ST2

Functional modes, VCO dividers

1024

ST3

Reserved

1124

ST4

Reserved

Data

MSBMSB-1

LSB

tsetup

tdk

clk_loadr

tload

thold

Clock

Load

clk_loadf

Table 21.

SPI timing specification

Symbol

Parameter

Min.

Typ.

Max.

Units

tsetup

DATA to CLOCK setup time

0.8

thold

DATA to CLOCK hold time

0.2

tclk

CLOCK cycle period

tload

LOAD pulse width

tclk_loadr

CLOCK to LOAD rising edge

tclk_loadf

CLOCK to LOAD falling edge

0.5

STW81103 Datasheet(PDF) 37 Page - STMicroelectronics

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