ICS844S42I Datasheet, PDF (12/27 Pages) Integrated Device Technology – On-chip crystal oscillator for reference frequency generation

ICS844S42I Data Sheet
DUAL OUTPUT RF FREQUENCY SYNTHESIZER
Table 5. Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Test Conditions
Minimum Typical Maximum
Fundamental
16
50
7
Units
MHz

pF
AC Electrical Characteristics
Table 6. AC Characteristics, V_DD = V_DDOA = V_DDOB = 3.3V ± 5%, T_A = -40°C to +85°C
Symbol Parameter
Test Conditions
Minimum
f_REF
f_VCO
Input Reference Frequency
VCO frequency range
NA, NB = ÷1
1296
1296
NA, NB = ÷2
648
NA, NB = ÷3
432
f_OUT
QA, QB Output frequency
NA, NB = ÷4
324
NA, NB = ÷6
216
NA, NB = ÷8
162
NA, NB = ÷16
81
f_QA= f_QB
NA, NB = ÷1
NA, NB ÷1
tsk(o)
Output Skew
NOTE 1, 2, 3
f_QA  f_QB
across QA and QB at
coincident edges,
NA, NB = ÷2 or ÷4
across QA and QB at
coincident edges,
NA, NB = ÷4 or ÷8
tjit(cc) Cycle-to-Cycle Jitter f_QA= f_QB
f_QA= f_QB
f > 2GHz
tjit(per) RMS Period Jitter
f_QA= f_QB
f  1GHz
f_QA= f_QB
1GHz < f  2GHz
t_R / t_F
Output
Rise/Fall Time
LVDS, LVPECL
20% to 80%
60
NA, NB = ÷1, LEV_SEL = 0
45
NA, NB = ÷1, LEV_SEL = 1
44
odc
Output Duty Cycle QA, QB
NA, NB = ÷2
46
NA, NB = ÷3
47
NA, NB = ÷4, ÷6, ÷8, ÷16
48
Typical
16
Maximum
2592
2592
1296
864
648
432
324
162
15
25
80
35
25
3.4
3.0
2.5
220
55
56
54
53
52
Units
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
ps
ps
ps
ps
ps
ps rms
ps rms
ps rms
ps
%
%
%
%
%
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 1: Defined as skew between output at the same supply voltage and with equal load conditions. Measured from V_DD/2 of the input to the
differential crossing point.
NOTE 2: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 3: Other output divider combinations may yield much greater output skews.
ICS844S42BKI REVISION A FEBRUARY 21, 2012
12
©2012 Integrated Device Technology, Inc.