AK1599V Datasheet, PDF (24/41 Pages) Asahi Kasei Microsystems – RF Transmitter for Satellite Communication

[AK1599V]
< Address0x04: function1 >
D[19:16]
CALTM[3:0]: Set the calibration precision of VCO
CALTM[3:0] bits determines the calibration precision of VCO and time. The larger CALTM[3:0] bits are
set, the higher calibration precision becomes, but the calibration time becomes long as trade-off. The
value calculated by the following formula is recommended to achieve enough calibration precision.
However, CALTM[3:0] bits should be set between 1 and 11. 0 and Over 12 are prohibited.
CALTM[3:0] ≥ log₂ (PFD frequency / 20000)
The calibration time can be estimated as following calculation;
Calibration time = 1 / PFD frequency × {(6 + 2 ^ {CALTM[3:0]}) × 8 + 3}
D[14]
LDCNTSEL: Lock Detection Precision
Set the counter value for digital lock detection.
LDCNTSEL
0
1
Function
15 times Count
3 times Count
31 times Count
7 times Count
unlocked to locked
locked to unlocked
unlocked to locked
locked to unlocked
D[13]
LD: Lock detection function
Set the lock detection function. Refer to "8.2.1.Lock Detection" for details.
0: Digital lock detection
1: Analog lock detection
D[12]
MTLD: Local signal mute. Select disable or enable to mute during unlocked state.
0: Disable to mute local signal during unlocked state
1: Enable to mute local signal during unlocked state
Be sure to set MTLD bit = 0 when LD bit = 1, so that Lock detection is Analog mode.
D[11]
FASTEN: Fast lock up mode setting
Set enable / disable fast lock up mode.
0: Disable fast lock up mode
1: Enable fast lock up mode
Refer to "8.2.3. Fast lock up mode" for details.
015006835-E-00
- 24 -
2015/5