SM8721AB Datasheet, PDF (5/8 Pages) Nippon Precision Circuits Inc – 3-PLL Multi-Output Clock Generator

SM8721AB
AC Characteristics
V_DD = (V_DD1, V_DD2, V_DD3) = 3.3 ± 0.3V, V_SS = (V_SS1, V_SS2, V_SS3) = 0V, Ta = −40 to +85°C unless otherwise
noted.
Parameter
Symbol
Pins
Conditions
Rating
Unit
min
typ
max
Output clock rise time^*1
t_r
CLK1, CLK2, C_L = 15pF, V_OL = 0.2V_DD to
REF_CLK V_OH = 0.8V_DD transition
–
2.0
–
ns
Output clock fall time^*1
t_f
CLK1, CLK2, C_L = 15pF, V_OH = 0.8V_DD to
REF_CLK V_OL = 0.2V_DD transition
–
2.0
–
ns
Output clock jitter^*2,*3
t_jitter
(1-sigma)
t_jitter
(peak-peak)
CLK1, CLK2,
REF_CLK
CLK1, CLK2,
REF_CLK
Ta = 25°C, C_L = 15pF,
V_O = 0.5V_DD
Ta = 25°C, C_L = 15pF,
V_O = 0.5V_DD
–
30
–
ps
–
180
–
ps
Dt1
Output clock duty cycle^{*1, *3}
CLK1, CLK2, Ta = 25°C, C_L = 15pF,
REF_CLK V_O = 0.5V_DD
45
50
55
%
Dt2
CLK1
Ta = 25°C, C_L = 15pF,
V_O = 0.5V_DD, 114.54546MHz
40
50
60
%
Power-up time^*3,*4,*5
t_P
CLK1, CLK2,
REF_CLK
–
1
5
ms
*1. Measured using the circuit shown in figure 1 on the NPC standard evaluation board.
*2. Measured using the circuit shown in figure 2 on the NPC standard evaluation board.
*3. The crystal oscillator element coefficients for characteristics measurements are described below (HP4195 measurement equipment).
f = 14.318182MHz crystal: R = 12.16Ω, L = 10.34mH, Ca = 11.95fF, Cb = 4.03pF
f = 28.636363MHz crystal: R = 12.50Ω, L = 5.89mH, Ca = 5.25fF, Cb = 1.65pF
Cb
L Ca R
*4. The power-up time is the time from when the supply reaches 3.0V after the supply is turned ON until each output clock reaches its designated
frequency to within ±0.1%.
*5. Measured using the NPC standard evaluation board.
14.318182/
28.636363MHz
DUT
Active Probe
(HP1152A)
DUT:Device under test
Passive Probe
(HP10435A)
Oscilloscope
(Infinium
HP54845A)
Frequency &
Time Interval
Analyzer
(HP5371A)
Figure 1. Measurement circuit 1
14.318182/
28.636363MHz
DUT
Active Probe
(HP1152A)
DUT:Device under test
Oscilloscope
(Infinium
HP54845A)
Jitter
Measurement
System
(ASA, M1)
Figure 2. Measurement circuit 2
SEIKO NPC CORPORATION —5