STW81101AT datasheet(36/48 Pages) STMICROELECTRONICS

36 / 48 page

SPI digital interface

STW81101

36/48

The LO output frequency is programmed by setting the proper values for A, B and R

according to the following formula:

Table 22.

Bits at 01h and ST2

Serial interface address = 01h

Bit

Name

Description

[23]

PD6

DEVICE FUNCTIONAL MODES

0. Power down

1. Enable VCO A, output frequency divided by 2

2. Enable VCO B, output frequency divided by 2

3. Enable external VCO, output frequency divided by 2

4. Enable VCO A, output frequency divided by 4

5. Enable VCO B, output frequency divided by 4

6. Enable external VCO, output frequency divided by 4

7. Enable VCO A, direct output

8. Enable VCO B, direct output

9. Enable external VCO, direct output

[22]

PD5

[21]

PD4

[20]

PD3

[19]

PD2

[18]

PD1

[17]

PD0

[16]

B11

B Counter Bits

[15]

B10

[14]

[13]

[12]

[11]

[10]

[9]

[8]

[7]

[6]

[5]

[4]

A Counter Bits

[3]

[2]

[1]

[0]

where DR equals

{

for direct output

0.5

for output divided by 2

0.25 for output divided by 4

and

P is the selected prescaler modulus.

OUT

()

REF

CLK

–

----------------------------

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