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PDF GS4915 Data sheet ( Hoja de datos )
| Número de pieza | GS4915 | |
| Descripción | ClockCleaner | |
| Fabricantes | Gennum | |
| Logotipo |  |
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GS4915 ClockCleaner™
Key Features
• Reduces jitter for clocks of 148.5MHz,
148.5/1.001MHz, 74.25MHz, 74.25/1.001MHz and
27MHz
• Output jitter as low as 20ps peak to peak
• Automatic bypass mode for all other clock rates
• Loop bandwidth adjustable as low as 2kHz
• Output skew control
• Input selectable as differential or single-ended
• Both single-ended and differential outputs
• Uses the GO1555 VCO
• Small 6mm x 6mm 40-pin QFN package
• Pb-free and RoHS compliant
Applications
High definition video systems. Digital video recording,
playback, processing and display devices.
Description
The GS4915 provides a low jitter clock output when fed
with an HD or SD video clock input. Other input clock
frequencies between 12MHz and 165MHz can be
automatically passed through to the GS4915 outputs.
An internal 2:1 mux allows the user to select between a
differential or single-ended (LVCMOS) input clock. Both a
single-ended LVCMOS- compatible and an
LVDS-compatible differential output are provided.
The GS4915 may operate in either auto or fixed frequency
mode. In auto mode, the device will automatically clean the
selected input clock if its frequency is found to be one of the
supported SD or HD clock rates. In fixed mode, the user
selects only one of these frequencies to be cleaned.
In addition, the device allows the user to select between
auto or manual bypass operation. In autobypass mode, the
GS4915 will automatically bypass its cleaning stage and
pass the input clock signal directly to the output whenever
the device is unlocked, which includes the case where the
input frequency is something other than the five
frequencies supported. In manual bypass mode, the input
signal passes through directly to the output.
The GS4915 can optionally double the output frequency for
74.25MHz or 74.175MHz HD clocks in order to provide
optimal jitter performance of some serializers.
The GS4915 also provides the user with a 2-state skew
control. The output clocks produced by the device may be
advanced by ¼ of an output CLK period in order to
accommodate downstream setup and hold requirements.
The GS4915 is designed to operate with the GO1555 VCO.
The GS4915 Clock Cleaner complements Gennum's
GS4911B Clock and Timing Generator for implementing a
video genlock solution. Whereas the GS4911B itself cleans
low-frequency jitter, the GS4915 is designed to clean
primarily the higher frequency jitter of clocks generated by
the GS4911B.
GS4915 ClockCleaner™
Data Sheet
39145 - 5
June 2009
www.gennum.com
1 of 27
1 page  
1. Pin Out
1.1 Pin Assignment
REG_VDD
AGND
PD_VDD
CLKIN
CLKIN
AGND
IN_VDD
CLKIN_SE
AGND
RESET
40 39 38 37 36 35 34 33 32 31
1 30
2 29
3 28
4 27
5
GS4915
26
40-pin QFN
6
(Top View)
25
7 24
8 23
9 22
10 21
11 12 13 14 15 16 17 18 19 20
AGND
CLKOUT
CLKOUT
DIFF_OUT_VDD
AGND
D_VDD
CLKOUT_SE
SE_VDD
GND
LOCK
Figure 1-1: 40-Pin QFN
Ground Pad
(Bottom of Package)
GS4915 ClockCleaner™
Data Sheet
39145 - 5
June 2009
5 of 27
5 Page 
Table 2-2: AC Electrical Characteristics (Continued)
VDD = 1.8V ±5%, TA = 0ºC to 70ºC, unless otherwise shown
Parameter
Symbol Conditions
Output Jitter
Differential Output
Output Jitter
Single-ended Output
Output Duty Cycle
–
–
–
–
–
Differential Clock Output Rise / Fall Time –
Single-ended Clock Output Rise / Fall
Time
–
Input Clock Frequency
–
Output Clock Frequency
–
Lock Detect Time
tLOCKD
Unlock Detect Time
tUNLOCKD
Lock Time
Device Latency
tLOCK
–
Device Latency Difference
–
NOTES:
1. One UI refers to one cycle of the input CLK.
2. Assuming power up has already occurred.
3. Difference between cleaning and bypass modes.
100kHz to 10MHz
Unfiltered
100kHz to 10MHz
Unfiltered
Differential output
Single-ended
output
100Ω diff. load
10 pF load
–
–
Within 300ppm of
reference
frequency
Within 700ppm of
reference
frequency
–
Differential in,
Differential out,
SKEW_EN = LOW
Differential in,
Differential out,
SKEW_EN = HIGH
Single ended in,
single ended out,
SKEW_EN = LOW
Single ended in,
single ended out,
SKEW_EN = HIGH
–
Min
–
–
–
–
45
40
–
–
12
12
–
–
–
–
–
–
–
–
Typ
20
40
60
100
–
–
500
1200
–
–
–
–
–
1.2
1.2 -
Tout/4
3.5
3.5 -
Tout/4
750
Max
–
–
–
–
55
60
Units
ps
ps
ps
ps
%
%
Notes
–
–
–
–
–
–
– ps –
– ps –
165 MHz
165 MHz
500 us
–
–
–
500 us
–
1s 2
– ns –
– ns –
– ns –
– ns –
– ps 3
GS4915 ClockCleaner™
Data Sheet
39145 - 5
June 2009
11 of 27
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet GS4915.PDF ] | |
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