HMC7044 Datasheet, PDF (6/72 Pages) Analog Devices – JESD204B clock generation

HMC7044
Parameter
PLL1 BEHAVIOR ON REFERENCE
FAILURE¹
LOS Assertion Delay⁷
Erroneously Active ICP1 Time on
Reference Failure⁸
Temporary Frequency Glitch Due
to Reference Failure
Integrated Frequency Error Due to
Reference Failure
Signal Valid Time to Clear LOS⁹
PLL1 VTUNE LEAKAGE SOURCES
Charge Pump Tristate Leakage
Current
Board Level XTAL Tune Input Port
Board Level Loop Filter
Components
HOLDOVER CHARACTERISTICS
VTUNE Drift Over 1 sec in Tristate
Mode
Holdover
Analog-to-Digital Converter
(ADC)/Digital-to-Analog
Converter (DAC) Resolution
ADC/DAC Code 0 Voltage
ADC/DAC Code 127 Voltage
DAC Temperature Stability
ADC/DAC Integral Nonlinearity
(INL)
Holdoff Timer Period^{1, 10}
HOLDOVER EXIT—INITIAL PHASE
OFFSETS¹
Exit Criteria = Wait for Low Phase
Error
Min
2 + tDGPO
0
2
1
Typ
0.03
0.016
0.2
0.5
2
2
19
0.28
2.71
0.07
−0.11
Exit Action = None
±4
Exit Criteria = Any¹¹
Exit Action = Reset Dividers
1
Exit Action = None
HOLDOVER EXIT CHARACTERISTICS^{1, 12}
DAC Assisted Release Period per 1/2
Step (tDACASSIST)
DAC Assisted Release Time
Delay of Exit Criteria¹³ = Wait for
Low Phase Error¹⁴
Data Sheet
Max
Unit
Test Conditions/Comments
3 + tDGPO
8
3
tLCM
ns
ppm
ppm
tLOSVAL
nA
nA
nA
mV
mV
From missing signal edge to alarm on GPO
ICP1 = 1 mA, C12 = 4.6 nF, Crystek CVPD-952
VCXO
ICP1 = 1 mA, C13 = 1 μF, Crystek CVPD-952 VCXO
Crystek CVPD-952 VCXO
C12 = 4.6 nF, C13 = 1 μF, R9 = 11 kΩ, C15 =
unpopulated
C12 = 4.6 nF, C13 = 1 μF, R9 = 11 kΩ,
CVPD-950 VCXO
7-bit, monotonic, no missing code
V
V
mV/°C
LSBs
At maximum code
Worst case across codes
2²⁶
tLCM
The phase offset to make up after a transition
from holdover to acquisition when using this
feature
ns
2
tVCXO
Assumes N2 > 3 and dividers are reset upon
exit; note that VCXO lags at start; value applies
as the starting phase error if DAC assisted
release is used
±N1
tVCXO
Dividers are not reset upon exit
1/16
9
tLKD
tDACASSIST
N1/fERR_VCXO sec
Based on lock detect timer setpoint
Time from decision to leave holdover until in
fully natural acquisition; assumes no
interruption by LOS or user
Rev. B | Page 6 of 72