STW81103 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

STW81103

Multi-band RF frequency synthesizer with integrated VCOs

STMicroelectronics 

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STW81103

SPI digital interface

Table 19. SPI data structure (MSB is sent first)

MSB

LSB

Address

Data for register (24 bits)

A1 A0 D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Table 20. Address decoder and outputs

Address

A1 A0 DATABITS D23-D0 No Name

0

0

24

0

1

24

1

0

24

1

1

24

0

ST1

1

ST2

2

ST3

3

ST4

Outputs

Function

Reference divider, VCO amplitude, VCO calibration,

charge pump current, prescaler modulus

Functional modes, VCO dividers

Reserved

Reserved

7.2

Timing specification

Figure 27. SPI timing specification

tsetup thold

Data

Clock

Load

MSB

MSB-1

tdk

Table 21. SPI timing specification

Symbol

Parameter

tsetup

thold

tclk

tload

tclk_loadr

tclk_loadf

DATA to CLOCK setup time

DATA to CLOCK hold time

CLOCK cycle period

LOAD pulse width

CLOCK to LOAD rising edge

CLOCK to LOAD falling edge

LSB

tclk_loadf

t clk_loadr

tload

Min.

0.8

0.2

10

3

2

0.5

Typ.

Max.

Units

ns

ns

ns

ns

ns

ns

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