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AK2401 Arkusz danych(PDF) 74 Page - Asahi Kasei Microsystems

Numer części AK2401
Szczegółowy opis  Direct Conversion Transceiver
Download  103 Pages
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Producent  AKM [Asahi Kasei Microsystems]
Strona internetowa  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

AK2401 Arkusz danych(HTML) 74 Page - Asahi Kasei Microsystems

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[AK2401]
017003093-E-00
2017/3
74
15.5. <0x0A~0x0B>CP
Address
D7
D6
D5
D4
D3
D2
D1
D0
R/W
0x0A
X
CPOF[1:0]
CPFINE[4:0]
R/W
Initial value
0
0
0
0
0
0
0
0x0B
X
X
X
CPFAST[4:0]
R/W
Initial value
0
0
0
0
0
CPOF[1:0]: Phase Offset Adjustment by Frequency Phase Comparator
Phase noise characteristics and spurious characteristics are affected by adding an offset to the phase
when the frequency of an input signal that is input to the frequency phase comparator is locked. These
characteristics could be improved by this setting with optimized conditions. Percentages in the table
below are normalized. Normally, CPOF[1:0] bits must be set to
“00”.
CPOF
Phase Offset
[1]
[0]
0
0
0% (default)
0
1
-11%
1
0
-20%
1
1
-27%
CPFINE[4:0]: Charge Pump Current Setting for Normal Operation
CPFAST[4:0]: Charge Pump Current Setting for First Lock Mode
The charge pump current can be calculated by the equations below.
Charge Pump Current [
μA] = I
CP_MIN [μA] × (Setting Value + 1)
ICP_MIN [μA] = 2025 / Resistor Connected to the [BIAS2] pin [kΩ]
Charge Pump Current (Typ.) Unit:
μA
CPFAST[4:0]
CPFINE[4:0]
BIAS2 Pin Connected Resistance
33kΩ
27kΩ
22kΩ
0
61
75
92
1
123
150
184
2
184
225
276
3
246
300
368
・・・
・・・
n
2025 / BIAS2 Pin Resistance [k
Ω]×(n+1)
・・・
・・・
28
1780
2175
2669
29
1841
2250
2761
30
1902
2325
2853
31
1964
2400
2946


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