T2801 Просмотр технического описания (PDF) - Atmel Corporation
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T2801 Datasheet PDF : 31 Pages
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T2801
6.6 VCO_DAC Adjustment
Table 6-8. With bit D3 - D5
D5
0
0
0
0
1
1
1
1
Pretune DAYC Voltage
D4
D3
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
fVCO/%
-5
...
...
...
...
...
...
5
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
Table 6-9. With bit D0 - D2
CPCS (Charge-pump Current Settings)
D2
D1
D0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
CPCS
–4
–3
–2
–1
0
1
2
3
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
21
4567B–DECT–03/06
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