21

4567B–DECT–03/06

T2801

6.6

VCO_DAC Adjustment

Note:

Used to pretune the VCO frequency in case of production tolerances of the device. Tuning voltage

in locked condition should be around 1.8V at room temperature. This gives margin for ambient

temperature changes

6.7

CPCS Adjustment

Note:

Used to adjust the charge pump current. This can be used to compensate the change of the tun-

ing sensitivity over frequency and device tolerances

Table 6-8.

With bit D3 - D5

Pretune DAYC Voltage

D5

D4

D3

f

00

0

-5

00

1

...

01

0

...

01

1

...

10

0

...

10

1

...

11

0

...

11

15

Table 6-9.

With bit D0 - D2

CPCS (Charge-pump Current Settings)

D2

D1

D0

CPCS

00

0

–4

00

1

–3

01

0

–2

01

1

–1

10

0

0

10

1

1

11

0

2

11

1

3