AK1590 Datasheet, PDF (22/36 Pages) Asahi Kasei Microsystems – 1GHz Delta-Sigma Fractional-N Frequency Synthesizer

[AK1590]
< Address 3: Div >
D19 D18 D17 D16 D15 D14
0
0
0
0 CPHIZ DITH
D[13:12]
LDCKSEL[1:0]
D11 D10
D[9:8]
LD CPPOLA PRE[1:0]
D[7:0]
R[7:0]
Addres
00s11
CPHIZ: Select normal or TRI-STATE for the CP1/CP2 output.
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 Hi-Z state.
DITH: Select dithering ON or OFF for a delta-sigma circuit.
D14
Function
Remarks
0 DITH OFF
Low Noise mode
1 DITH ON
Low Spurious mode
It is used to control the turning On or Off for dithering to cancel cyclical noise.
LDCKSEL[1:0] : Set phase error values for lock detect.
D13 D12
Function
Remarks
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
For detailed functional descriptions, see the section “Lock Detect (LD) Signal” in “8. Block Functional
Description”.
LD: Select analog or digital for the lock detect.
D11
Function
Remarks
0 Digital Lock Detect
1 Analog Lock Detect
For detailed functional descriptions, see the section “Lock Detect (LD) Signal” in “8. Block Functional
Description”.
CPPOLA: Select positive or negative output polarity for Charge Pump 1 and Charge Pump 2.
D10
Function
Remarks
0 Positive
1 Negative
MS1478-E-01
22
2013/2