ICS844N255I Datasheet, PDF (8/21 Pages) Integrated Device Technology – Six differential LVDS clock outputs

ICS844N255I Data Sheet
FEMTOCLOCK^® NG CRYSTAL-TO-LVDS CLOCK SYNTHESIZER
AC Electrical Characteristics
Table 6. AC Characteristics, V_DD = V_DDOX = 2.5V±5%, T_A = -40°C to 85°C
Symbol Parameter
Test Conditions
QA
f_OUT
QB, QC
Output Frequency
QD
QE
f_REF
Reference Frequency
156.25MHz
Integration Range: 1MHz – 20MHz
Integration Range: 12kHz – 20MHz
tjit(Ø)
RMS Phase Jitter
(Random);
NOTE 1
125MHz
Integration Range: 12kHz – 20MHz
Integration Range: 10kHz – 1.5MHz
Integration Range: 1.5MHz – 62.5MHz
Integration Range: 12kHz – 20MHz
100MHz
Integration Range: 10kHz – 1.5MHz
Integration Range: 1.5MHz – 50MHz
Offset: 100Hz
Φ_N
Single-Side Band
Noise Power
156.25MHz
Offset: 1kHz
Offset: 10kHz
Offset: 100kHz
Offset: 20MHz
100MHz
tjit(cc) Cycle-to-Cycle Jitter; NOTE 2
125MHz
156.25MHz
tsk(b)
Bank Skew;
NOTE 2, 3
QB[0:1],
nQB[0:1]
t_R / t_F
t_LOCK
odc
Output Rise/Fall Time
PLL Lock Time
Output Duty Cycle
20% to 80%
Minimum
125
100
25
25
250
48
Typical
25
0.27
0.30
0.30
0.26
0.25
0.31
0.26
0.28
-58
-117
-127
-133
-157
8
Maximum Units
156.25 MHz
125
MHz
50
MHz
50
MHz
MHz
0.34
ps
0.39
ps
0.43
ps
0.40
ps
0.40
ps
0.43
ps
0.38
ps
0.42
ps
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
6.8
ps
6.7
ps
7.3
ps
16
ps
650
ps
10
ms
52
%
NOTE: Electrical parameters are guaranteed over the specified ambient operating temperature range, which is established when the device is
mounted in a test socket with maintained transverse airflow greater than 500 lfpm. The device will meet specifications after thermal equilibrium
has been reached under these conditions.
NOTE: Characterized with 25MHz crystal, unless otherwise noted.
NOTE: V_DDOX denotes V_DDOA, V_DDOB, V_DDOC, V_DDOD, and V_DDOE.
NOTE 1: Please refer to the phase noise plots.
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 3: Defined as skew within a bank of outputs at the same voltage and with equal load conditions.
ICS844N255AKILF REVISION A NOVEMBER 23, 2011
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©2011 Integrated Device Technology, Inc.