PR

EL

IM

INA

RY

EVB71122

300 to 930MHz Receiver

Evaluation Board Description

39012 71122 01

Page 10 of 32

EVB Description

Rev. 001

Sept/06

2.2.4

Counter Settings in ABC Mode – 8 Preconfigured Channels

In ABC mode (SPISEL=0), the counter settings are hard-wired. In below table all frequency units are in MHz.

FSK

N

P

A

R

1

369.5

120.5

490.0

3675

114

32

27

0.133

75

10

122.5

2

2

371.1

121.0

492.0

3691

115

32

11

0.133

75

10

123.0

2

3

375.3

122.4

497.7

3733

116

32

21

0.133

75

10

124.4

2

4

376.9

123.0

499.9

3749

117

32

5

0.133

75

10

125.0

2

5

388.3

126.8

515.1

3863

120

32

23

0.133

75

10

128.8

2

6

391.5

127.8

519.3

3895

121

32

23

0.133

75

10

129.8

2

7

394.3

128.8

523.1

3923

122

32

19

0.133

75

10

130.8

2

8

395.9

129.3

525.2

3939

123

32

3

0.133

75

10

131.3

2

List of Mathematical Acronyms

A

divider ratio of the swallow counter (part of feedback divider)

FB

f

frequency at the feedback divider output

(x)

floor

The floor function gives the largest integer less than or equal to x.

For example, floor(5.4) gives 5, floor(-6.3) gives -7.

PFD

f

PFD frequency in locked state

R

RO

f

R

f

=

reference frequency of the PLL

RO

f

frequency of the crystal reference oscillator

VCO

f

frequency of the VCO (equals the LO1 signal of the first mixer)

A

P

N

N

tot

+

⋅

=

total divider ratio of the PLL feedback path

N

divider ratio of the program counter (part of feedback divider)

LO2

N

P

divider ratio of the prescaler (part of feedback divider)

R

divider ratio of the reference divider R