AK1541_17 Datasheet, PDF (21/37 Pages) Asahi Kasei Microsystems – 20 to 600Mhz Delta-Sigma Fractional-N Frequency Synthesizer

[AK1541]
< Address 3: Div >
D19 D18 D17 D16 D15 D14
D[13:12]
D11
D10
D[9:8]
0 0 0 0 CPHI DITH LDCKSEL[1:0] LD CPPOLA PRE[1:0]
Z
CPHIZ: Selects normal or TRI-STATE for the CP1/CP2 output.
D[7:0]
R[7:0]
Addres
00s11
D15
Function
Remarks
0 Charge pumps are activated.
Use this setting for normal operation.
1 TRI-STATE
Note 1)
Note 1) The charge pump output is put in the high-impedance (Hi-Z) state.
DITH: Selects dithering ON or OFF for a delta-sigma circuit.
D14
0 DITH OFF
1 DITH ON
Function
Remarks
Recommended
It is used to control the turning On or Off dithering to cancel cyclical noise.
In normal operation, ”1”= DITH ON is recommended.
LDCKSEL[1:0] : Sets a phase error value for lock detect.
D13 D12
Function
0 0 1 cycle of the REFIN clock
0 1 2 cycles of the REFIN clock
1 0 3 cycles of the REFIN clock
1 1 Prohibited
Remarks
For detailed functional descriptions, see the section “Lock Detect (LD) Signal” in “8. Block Functional
Description”.
LD: Selects analog or digital for the lock detect.
D11
Function
0 Digital Lock Detect
1 Analog Lock Detect
Remarks
For detailed functional descriptions, see the section “Lock Detect (LD) Signal” in “8. Block Functional
Description”.
MS1043-E-05
21
2013/03