參數(shù)資料
型號(hào)： ADV7178KS
廠(chǎng)商： ANALOG DEVICES INC
元件分類(lèi)： 顏色信號(hào)轉(zhuǎn)換
英文描述： Integrated Digital CCIR-601 to PAL/NTSC Video Encoder
中文描述： COLOR SIGNAL ENCODER, PQFP44
封裝： PLASTIC, MO-112-AA-1, MQFP-44
文件頁(yè)數(shù)： 37/38頁(yè)
文件大?。?/td> 280K
代理商： ADV7178KS
ADV7177/ADV7178
–37–
REV. 0
For external buffering of the ADV7177/ADV7178 DAC out-
puts, the configuration in Figure 67 is recommended. This
configuration shows the DAC outputs running at half (18 mA)
their full current (34.7 mA) capability. This will allow the
ADV7177/ADV7178 to dissipate less power, the analog current is
reduced by 50% with a R
SET
of 300
and a R
LOAD
of 75
. This
mode is recommended for 3.3 volt operation as optimum perfor-
mance is obtained from the DAC outputs at 18 mA with a V
AA
of
3.3 volts. This buffer also adds extra isolation on the video out-
APPENDIX 6
OPTIONAL DAC BUFFERING
puts, see buffer circuit in Figure 68. When calculating absolute
output full current and voltage, use the following equation:
V
OUT
=
I
OUT
×
R
LOAD
(
I
OUT
=
V
REF
×
K
)
R
SET
K
=
4.2146 constant,
V
REF
=
1.235 V
ADV7177/ADV7178
V
REF
DIGITAL
CORE
PIXEL
PORT
300
V
R
SET
75
V
75
V
75
V
V
AA
OUTPUT
BUFFER
DAC A
OUTPUT
BUFFER
OUTPUT
BUFFER
DAC C
DAC B
Figure 67. Output DAC Buffering Configuration
2N2907
75
V
75
V
OUTPUT TO
TV/MONITOR
36
V
INPUT
V
CC
Figure 68. Recommended Output DAC Buffer
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參數(shù)描述
ADV7178KS-REEL 制造商:Analog Devices 功能描述:
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ADV7179BCP1 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Chip Scale PAL/NTSC Video Encoder with Advanced Power Management
ADV7179BCP-REEL 制造商:Analog Devices 功能描述:Video Encoder 3DAC 10-Bit 40-Pin LFCSP EP T/R
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