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ICS810001-22

Description
FemtoClock⑩ Dual VCXO Video PLL
File Size167KB,19 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
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ICS810001-22 Overview

FemtoClock⑩ Dual VCXO Video PLL

FemtoClock™ Dual VCXO Video PLL
810001-22
DATA SHEET
General Description
The 810001-22 is a PLL based synchronous clock generator that is
optimized for digital video clock jitter attenuation and frequency
translation. The device contains two internal frequency multiplication
stages that are cascaded in series. The first stage is a VCXO PLL
that is optimized to provide reference clock jitter attenuation, and to
support the complex PLL multiplication ratios needed for video rate
conversion.
The second stage is a FemtoClock™ frequency multiplier that
provides the low jitter, high frequency video output clock.
Preset multiplication ratios are selected from internal lookup tables
using device input selection pins. The multiplication ratios are
optimized to support common video rates used in professional video
system applications. The VCXO requires the use of an external,
inexpensive pullable crystal. Two crystal connections are provided
(pin selectable) so that both 60 and 59.94Hz base frame rates can
be supported. The VCXO requires external passive loop filter
components which are used to set the PLL loop bandwidth and
damping characteristics.
Features
Jitter attenuation and frequency translation of video clock signals
Supports SMTPE 292M, ITU-R Rec. 601/656 and
MPEG-transport clocks
Support of High-Definition (HD) and Standard-Definition (SD) pixel
rates
Dual VCXO-PLL supports both 60 and 59.94Hz base frame rates
in one device
Dual PLL mode for high-frequency clock generation (32.967MHz
to 162MHz)
VCXO-PLL mode for low-frequency clock generation (27MHz and
26.973MHz)
One LVCMOS/LVTTL PLL clock output
Two selectable LVCMOS/LVTTL input clocks
LVCMOS/LVTTL compatible control signals
RMS phase jitter @148.5MHz, using a 27MHz crystal
(12kHz – 20MHz): 1.01ps (typical)
3.3V supply voltage
0°C to 70°C ambient operating temperature
Available in a lead-free (RoHS 6) 32-VFQFN package
Use replacement part: 8T49N241-dddNLGI
Supported Input Frequencies
f
VCXO
= 27MHz
67.5kHz
56.25kHz
45.0kHz
37.5kHz
33.75kHz
31.4685kHz
31.25kHz
28.125kHz
27.0kHz
22.5kHz
18.75kHz
18kHz
15.7343kHz
15.625kHz
f
VCXO
= 26.973MHz
67.4326
56.1938
44.955
37.4625
33.7163
31.4371
31.2188
28.0969
26.973
22.4775
18.7313
17.982
15.7185
15.6094
Supported Output Frequencies
f
VCXO
= 27MHz
148.5
74.25
49.5
33
162
81
54
36
27
f
VCXO
= 26.973MHz
148.3516
74.1758
49.4505
32.967
161.8382
80.9191
53.9461
35.9640
26.973
810001-22 Rev A 8/14/15
1
©2015 Integrated Device Technology, Inc.

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