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參數(shù)資料
| 型號(hào)： | BT849A |
| 英文描述： | Single-Chip Video Capture for PCI |
| 中文描述： | 單芯片的PCI視頻捕捉 |
| 文件頁(yè)數(shù)： | 74/141頁(yè) |
| 文件大?。?/td> | 1149K |
| 代理商： | BT849A |
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Bt848/848A/849A
Single-Chip Video Capture for PCI
Brooktree
64
E
LECTRICAL
I
NTERFACES
Input Interface
L848A_A
Single Crystal Operation
(Bt848A/849A Only)
The Bt848A/849A includes an internal phase locked loop that may be used to de-
code NTSC and PAL using only a single crystal. When using the PLL, a
28.636363 MHz, 50 ppm, fundamental (or third overtone) crystal must be con-
nected to XT0.
This clock is used to generate the CLKx2 frequency via the following equation:
Frequency = (F_input / PLL_X) * PLL_I.PLL_F/PLL_C
where
F_input = 28.63636 MHz (50 ppm)
PLL_X = Reference pre-divider
PLL_I = Integer input
PLL_F = Fractional input
PLL_C = Post divider
These values should be programmed as follows to generate PAL frequencies:
PAL (CLKx2 = 35.46895 MHz)
PLL_X = 1
PLL_I = 0x0E
PLL_F = 0xDCF9
PLL_C = 0
The PLL can be put into low power mode by setting PLL_I to zero. For NTSC
operation PLL_I should be set to zero. In this mode, the correct clock frequency is
already input to the system and the PLL is shut down. An out of lock or error con-
dition is indicated by the PLOCK bit in the PSTATUS register.
When using the PLL to generate the required NTSC and PAL clock frequencies
the following sequence must be followed: Initially, TGCKI bits in the TGCTRL
register must be programmed for normal operation of the XTAL ports. After the
PLL registers are programmed, the PLOCK bit in the DSTATUS register must be
polled until it has been verified that the PLL has attained lock (approximately 500
ms). At that point the TGCKI bits are set to select operation via the PLL.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BT849AKPF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Chip Video Capture for PCI |
| BT850-SA | 功能描述:BTV4.2 DUAL MODE USB HCI MODULE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
| BT850-SA-T/R | 功能描述:BTV4.2 DUAL MODE USB HCI MODULE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:2,500 |
| BT850-ST | 功能描述:BTV4.2 DUAL MODE USB HCI MODULE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
| BT850-ST-T/R | 功能描述:BTV4.2 DUAL MODE USB HCI MODULEE 制造商:laird - wireless & thermal systems 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:2,500 |
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