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參數資料
| 型號： | ADV7178 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Integrated Digital CCIR-601 to PAL/NTSC Video Encoder |
| 中文描述： | 綜合數字無線電咨詢委員會，601到PAL / NTSC制式視頻編碼器 |
| 文件頁數： | 37/38頁 |
| 文件大小： | 280K |
| 代理商： | ADV7178 |
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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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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADV7178KS | 制造商:Analog Devices 功能描述: |
| ADV7178KS-REEL | 制造商:Analog Devices 功能描述: |
| ADV7179 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
| ADV7179BCP | 制造商:Analog Devices 功能描述:Video Encoder 3DAC 10-Bit 40-Pin LFCSP EP 制造商:Analog Devices 功能描述:IC VIDEO ENCODER |
| ADV7179BCP1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Chip Scale PAL/NTSC Video Encoder with Advanced Power Management |
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