Texas Instruments LMK04828 - Manual DAC Value Settings

LMK04821 , LMK04826 , LMK04828
SNAS605AR –MARCH 2013–REVISED DECEMBER 2015 www.ti.com
9.7.6.2 MAN_DAC[9:8], MAN_DAC[7:0]
These registers set the value of the DAC in holdover mode when used manually.
Table 43. MAN_DAC[9:0]
MSB LSB
0x14B[1:0] 0x14C[7:0]
POR
BIT REGISTERS NAME DESCRIPTION
DEFAULT
See LOS_TIMEOUT, LOS_EN, TRACK_EN, HOLDOVER_FORCE,
7:2 0x14B
MAN_DAC_EN, MAN_DAC[9:8] for information on these bits.
Sets the value of the manual DAC when in manual DAC mode.
Field Value DAC Value
1:0 0x14B MAN_DAC[9:8] 2
0 (0x00) 0
1 (0x01) 1
2 (0x02) 2
... ...
7:0 0x14C MAN_DAC[7:0] 0
1022 (0x3FE) 1022
1023 (0x3FF) 1023
9.7.6.3 DAC_TRIP_LOW
This register contains the high value at which holdover mode is entered.
Table 44. Register 0x14D
POR
BIT NAME DESCRIPTION
DEFAULT
7:6 NA 0 Reserved
Voltage from GND at which holdover is entered if HOLDOVER_VTUNE_DET is enabled.
Field Value DAC Trip Value
0 (0x00) 1 x Vcc / 64
1 (0x01) 2 x Vcc / 64
2 (0x02) 3 x Vcc / 64
5:0 DAC_TRIP_LOW 0
3 (0x03) 4 x Vcc / 64
... ...
61 (0x17) 62 x Vcc / 64
62 (0x18) 63 x Vcc / 64
63 (0x19) 64 x Vcc / 64
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