ICS843020-01 Datasheet, PDF (8/20 Pages) Integrated Circuit Systems – FEMTOCLOCKS-TM 680MHZ, CRYSTAL-TO- 3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS843020-01
FEMTOCLOCKS™ 680MHZ, CRYSTAL-TO-
3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
TABLE 5. INPUT FREQUENCY CHARACTERISTICS, V_CC = V_CCA = V_CCO = 3.3V±5%, TA = 0°C TO 70°C
Symbol Parameter
Test Conditions
Minimum Typical Maximum Units
TEST_CLK; NOTE 1
12
32
MHz
f_IN
Input Frequency
XTAL_IN, XTAL_OUT;
NOTE 1
12
32
MHz
S_CLOCK
32
MHz
NOTE 1: For the input crystal and TEST_CLK frequency range, the M value must be set for the VCO to operate within the
560MHz to 680MHz range. Using the minimum input frequency of 12MHz, valid values of M are 47 ≤ M ≤ 57, with input
divider P = ÷1 (P_DIV = Float). Using the maximum frequency of 32MHz, valid values of M are 18 ≤ M ≤ 21.
TABLE 6. CRYSTAL CHARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Drive Level
Test Conditions
Minimum Typical Maximum
Fundamental
12
32
50
7
1
Units
MHz
Ω
pF
mW
TABLE
7.
AC
CHARACTERISTICS,
V
CC
=
V
CCA
=
V
CCO
=
3.3V±5%,
TA
=
0°C
TO
70°C
Symbol Parameter
Test Conditions
Minimum Typical
F
OUT
tjit(Ø)
tsk(o)
Output Frequency
RMS Phase Jitter, (Random);
NOTE 1, 4
Output Skew; NOTE 2, 3
156.25MHz
(1.875MHz to 20MHz)
70
0.49
t /t
RF
Output Rise/Fall Time
M, N to nP_LOAD
20% to 80%
175
5
t_S
Setup Time S_DATA to S_CLOCK
5
S_CLOCK to S_LOAD
5
M, N to nP_LOAD
5
t_H
Hold Time S_DATA to S_CLOCK
5
S_CLOCK to S_LOAD
5
odc
Output Duty Cycle
47
t_LOCK
PLL Lock Time
See Parameter Measurement Information section.
NOTE 1: Please refer to the Phase Noise Plot.
NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions.
Measured at the output differential cross points.
NOTE 3: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 4: Tested with P_DIV = V_CC/2.
Maximum Units
680
MHz
ps
10
ps
800
ps
ns
ns
ns
ns
ns
ns
53
%
1
ms
843020AY-01
www.icst.com/products/hiperclocks.html
8
REV. B APRIL 14, 2005