STW81101ATR datasheet(32/42 Pages) STMICROELECTRONICS

32 / 42 page

SPI digital interface

STW81101

32/42

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

according to the following formula:

and P is the selected Prescaler Modulus

[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]

for Direct Output

where DR equals

0.5

for Output Divided by 2

0.25

for Output Divided by 4

Table 20.

Bits (continued)

Serial Interface Address = 00h

Bit

Name

Description

OUT

⋅

()

REF_CLK

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

⋅⋅

{

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