STW81103 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

STW81103

Multi-band RF frequency synthesizer with integrated VCOs

STMicroelectronics 

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SPI digital interface

STW81103

7.3

Bit tables

Table 22. Bits at 00h and ST1

Serial interface address = 00h

Register name = ST1

Bit

Name

Description

[23]

R9

[22]

R8

[21]

R7

[20]

R6

[19]

R5

Reference clock divider ratio

[18]

R4

[17]

R3

[16]

R2

[15]

R1

[14]

R0

[13]

PLL_A1

VCO amplitude control

[12]

PLL_A0

[11]

CPSEL2

[10]

CPSEL1

Charge pump output current control

[9]

CPSEL0

[8]

PSC_SEL

Prescaler modulus select (0 for P=16, 1 for P=19)

[7]

INITCAL

For test purposes only; must be set to 0

[6]

SERCAL

Enable VCO calibration (see Section 7.4)

[5]

SELEXTCAL

For test purposes only; must be set to ‘0’

[4]

CAL4

[3]

CAL3

[2]

CAL2

For test purposes only; must be set to ‘0’

[1]

CAL1

[0]

CAL0

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