參數(shù)資料
型號(hào)： BT458LPJ80
英文描述： Video DAC with Color Palette (RAMDAC)
中文描述： 視頻DAC的調(diào)色板（的RAMDAC）
文件頁數(shù)： 33/60頁
文件大?。?/td> 647K
代理商： BT458LPJ80
L45801 Rev. N
Conexant
4-1
4
4.0 Application Information
4.1 Clock Interfacing
Because of the high clock rates at which the Bt457 and Bt458 can operate, they
will accept differential clock signals (CLOCK and CLOCK*). These clock inputs
are generated by ECL logic operating at +5 V The CLOCK and CLOCK* inputs
require termination resistors (220
to GND) that should be located as close as
possible to the clock driver. A 150
chip resistor connected between the
RAMDAC
’
s CLOCK and CLOCK* pins is also required to ensure proper
termination. It should be located as close as possible to the RAMDAC.
Figure 4-1
illustrates the location.
Figure 4-1. Generating the Bt458 Clock Signals
+5V
14
MONITOR
PRODUCTS
970E
7
220
330
+5V
220
220
150
0.1
1K
VAA
CLOCK
CLOCK*
LDA
VREF
CLOCK
CLOCK*
LDA*
VREF
Bt438
Bt458
457-8_007
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