參數(shù)資料
型號(hào)： GS4901B
廠商： Gennum Corporation
英文描述： SD Clock and Timing Generator with GENLOCK
中文描述： 統(tǒng)計(jì)時(shí)鐘和定時(shí)發(fā)生器鎖相
文件頁(yè)數(shù)： 4/95頁(yè)
文件大小： 898K
代理商： GS4901B
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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