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參數(shù)資料
型號(hào): ADV7170SU
廠商: ANALOG DEVICES INC
元件分類(lèi): 顏色信號(hào)轉(zhuǎn)換
英文描述: Digital PAL/NTSC Video Encoder with 10-Bit SSAF⑩ and Advanced Power Management
中文描述: COLOR SIGNAL ENCODER, PQFP44
封裝: PLASTIC, TQFP-44
文件頁(yè)數(shù): 41/55頁(yè)
文件大小: 754K
代理商: ADV7170SU
ADV7170/ADV7171
–41–
REV. 0
APPENDIX 8
OPTIONAL DAC BUFFERING
When external buffering is needed of the ADV7170/ADV7171
DAC outputs, the configuration in Figure 83 is recommended.
This configuration shows the DAC outputs running at half
(18 mA) their full current (36 mA) capability. This will allow
the ADV7170/ADV7171 to dissipate less power; the analog cur-
rent is reduced by 50% with a R
SET
of 300
and a R
LOAD
of 75
.
This mode is recommended for 3.3 V operation as optimum
performance is obtained from the DAC outputs at 18 mA with a
V
AA
of 3.3 V. This buffer also adds extra isolation on the video
outputs (see buffer circuit in Figure 84).
When calculating absolute output full-scale current and voltage,
use the following equations:
V
OUT
=
I
OUT
×
R
LOAD
(
I
OUT
=
V
REF
×
K
)
R
SET
K
=
4.2146 constant,
V
REF
=
1.235 V
ADV7170/ADV7171
V
REF
DIGITAL
CORE
PIXEL
PORT
300
V
R
SET
V
AA
OUTPUT
BUFFER
DAC A
OUTPUT
BUFFER
OUTPUT
BUFFER
OUTPUT
BUFFER
DAC C
DAC D
DAC B
CVBS
LUMA
CHROMA
CVBS
Figure 83. Output DAC Buffering Configuration
2N2907
75
V
75
V
OUTPUT TO
TV/MONITOR
36
V
INPUT
V
AA
Figure 84. Recommended Output DAC Buffer
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADV7171 制造商:AD 制造商全稱:Analog Devices 功能描述:Digital PAL/NTSC Video Encoder with 10-Bit SSAF⑩ and Advanced Power Management
ADV7171KS 制造商:Analog Devices 功能描述:Video Encoder 4DAC 10-Bit 44-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:ADVANCED NTSC/PAL ENCODER I.C. - Bulk 制造商:Analog Devices 功能描述:IC VIDEO ENCODER 制造商:Panasonic Industrial Company 功能描述:IC
ADV7171KS-REEL 制造商:Analog Devices 功能描述:Video Encoder 4DAC 10-Bit 44-Pin MQFP T/R 制造商:Rochester Electronics LLC 功能描述:ADVANCED NTSC/PAL ENCODER I.C. - Tape and Reel
ADV7171KSU 制造商:Analog Devices 功能描述:Video Encoder 4DAC 10-Bit 44-Pin TQFP 制造商:Rochester Electronics LLC 功能描述:ADVANCED NTSC/PAL ENCODER - Bulk 制造商:Analog Devices 功能描述:IC VIDEO ENCODER
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