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GS4901BCNE3 数据表(PDF) 4 Page - Gennum Corporation

部件名 GS4901BCNE3
功能描述  SD Clock and Timing Generator with GENLOCK
Download  95 Pages
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制造商  GENNUM [Gennum Corporation]
网页  http://www.gennum.com
标志 GENNUM - Gennum Corporation

GS4901BCNE3 数据表(HTML) 4 Page - Gennum Corporation

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GS4901B/GS4900B Preliminary Data Sheet
37703 - 0
April 2006
4 of 95
Contents
Key Features.................................................................................................................1
Applications...................................................................................................................1
Description ....................................................................................................................1
1. Pin Out ......................................................................................................................8
1.1 GS4901B Pin Assignment ..............................................................................8
1.2 GS4900B Pin Assignment ..............................................................................9
1.3 Pin Descriptions ............................................................................................10
1.4 Pre-Programmed Recognized Video Standards ...........................................20
1.5 Output Timing Signals ...................................................................................24
2. Electrical Characteristics.........................................................................................28
2.1 Absolute Maximum Ratings ..........................................................................28
2.2 DC Electrical Characteristics ........................................................................28
2.3 AC Electrical Characteristics .........................................................................30
2.4 Solder Reflow Profiles ...................................................................................33
3. Detailed Description ................................................................................................34
3.1 Functional Overview .....................................................................................34
3.2 Modes of Operation ......................................................................................34
3.2.1 Genlock Mode......................................................................................35
3.2.2 Free Run Mode....................................................................................38
3.3 Output Timing Format Selection ...................................................................39
3.4 Input Reference Signals ................................................................................40
3.4.1 HSYNC, VSYNC, and FSYNC.............................................................40
3.4.2 10FID ...................................................................................................41
3.4.3 Automatic Polarity Recognition............................................................41
3.5 Reference Format Detector ..........................................................................42
3.5.1 Horizontal and Vertical Timing Characteristic Measurements .............42
3.5.2 Input Reference Validity.......................................................................43
3.5.3 Behaviour on Loss and Re-acquisition of the Reference Signal..........44
3.5.4 Allowable Frequency Drift on the Reference .......................................46
3.6 Genlock .........................................................................................................46
3.6.1 Adjustable Locking Time......................................................................47
3.6.2 Adjustable Loop Bandwidth .................................................................48
3.6.3 Locking to Digital Timing from a Deserializer ......................................51
3.7 Clock Synthesis ............................................................................................52
3.7.1 Video Clock Synthesis .........................................................................52
3.7.2 Audio Clock Synthesis (GS4901B only) ..............................................53
3.8 Video Timing Generator ................................................................................57
3.8.1 10 Field ID Pulse .................................................................................57
3.8.2 Audio Frame Synchronizing Pulse (GS4901B only) ............................58
3.8.3 USER_1~4...........................................................................................59


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