15. Electrical Characteristics
260
Tsi384 User Manual
May 5, 2014
Integrated Device Technology
www.idt.com
15.6.4
Reference Clock
The following table lists the Tsi384’s electrical characteristics for the differential SerDes reference
clock input (PCIE_REFCLK_n/p).
Figure 43: Weighing Function for RMS Phase Jitter Calculation
Table 54: Reference Clock (PCIE_REFCLK_n/p) Electrical Characteristics
Symbol
Parameter
Min.
Typ.
Max.
Unit
Notes
V
SW
Input Voltage Swing
0.1
0.5
1
V
V
DIFF
Differential Input Voltage
Swing
V
DIFF =
V
SW
* 2
V
V
CM
Differential Input
Common Mode Range
[(PCIE_REFCLK_p
+PCIE_REFCLK_n)/2]
175
-
2000
mV
PCIE_REFCLK_p/n must
be AC coupled.
Fin
Input Clock Frequency
100.00
-
100.00
MHz
F
PCIE_REFCLK_P/N
Reference Clock
Frequency Tolerance
-300
-
+300
ppm
ppm with respect to
100 MHz, based on the
PCIe Specification.
Fin_DC
Reference Clock Duty
Cycle
40
50
60
%
-
J
CLK-REF
Total Phase Jitter (rms)
-
-
3
ps
rms
See
a
.
a. Total Permissible Phase Jitter on the Reference Clock is 3 ps rms. This value is specified with assumption that the
measurement is performed with a 20 GSamples/s scope with more than 1 million samples. The zero-crossing times of each
rising edges are recorded and an average Reference Clock is calculated. This average period may be subtracted from each
sequential, instantaneous period to find the difference between each reference clock rising edge and the ideal placement to
produce the Phase Jitter Sequence. The PSD of the phase jitter is calculated and integrated after being weighted with the
transfer function shown in
. The square root of the resulting integral is the rms Total Phase Jitter.
Zin
Input Impedance
80
100
114
Ohms
Magnitude
0 dB
20 dB/Decade
40 dB/Decade
1.5 MHz
10 MHz
Frequency
Содержание TSI384
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Страница 10: ...Contents 10 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...
Страница 36: ...2 Signal Descriptions 36 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...
Страница 56: ...4 Addressing 56 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...
Страница 62: ...5 Configuration Transactions 62 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...
Страница 74: ...6 Bridging 74 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...
Страница 78: ...7 PCI X Arbitration 78 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...
Страница 128: ...11 Power Management 128 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...
Страница 136: ...12 Serial EEPROM 136 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...
Страница 142: ...13 JTAG 142 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...
Страница 268: ...16 Packaging 268 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...
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Страница 280: ...Index 280 Tsi384 User Manual May 5 2014 Integrated Device Technology www idt com ...