STW81102 Datasheet, PDF (31/43 Pages) STMicroelectronics – Multi-band RF frequency synthesizer with integrated VCOs

STW81102
SPI digital interface
Table 18. SPI data structure
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 19. Address decoder and outputs
Address
Outputs
DATABITS
A1
A0
No
Name
D23-D0
Function
Reference divider, VCO amplitude,
0
0
24
0
ST1 VCO Calibration, Charge Pump
current, Prescaler Modulus
0
1
24
1
ST2 Functional modes, VCO dividers
1
0
24
2
ST3 Reserved
1
1
24
3
ST4 Reserved
6.2
Timing specification
Figure 27. SPI Timing specification
Table 20. SPI Timing specification
Parameter
Description
tsetup DATA to CLOCK setup time
thold DATA to clock hold time
tclk
tload
CLOCK cycle period
LOAD pulse width
tclk_loadr CLOCK to LOAD rising edge
tclk_loadf CLOCK to LOAD falling edge
Min.
Typ.
Max.
Unit
0.8
ns
0.2
ns
10
ns
3
ns
2
ns
0.5
ns
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