參數(shù)資料
型號(hào)： ADV7177KSZ-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 37/44頁(yè)
文件大?。?/td> 0K
描述： IC DAC VIDEO NTSC 3-CH 44MQFP
產(chǎn)品變化通告： ADV7xxx Obsolescence 16/Jan/2012
標(biāo)準(zhǔn)包裝： 800
類(lèi)型： 視頻編碼器
應(yīng)用： 機(jī)頂盒，電視
電壓 - 電源，模擬： 3 V ~ 3.6 V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 44-QFP
供應(yīng)商設(shè)備封裝： 44-MQFP（10x10）
包裝： 帶卷 (TR)
ADV7177/ADV7178
Rev. C | Page 42 of 44
OPTIONAL DAC BUFFERING
For external buffering of the ADV7177/ADV7178 DAC
outputs, the configuration in Figure 65 is recommended. This
configuration shows the DAC outputs running at half (18 mA)
their full-current (34.7 mA) capability. This allows the devices
to dissipate less power; the analog current is reduced by 50%
with a RSET of 300 and a RLOAD 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 VAA of 3.3 V.
This buffer also adds extra isolation on the video outputs, as the
buffer circuit in Figure 66 shows. When calculating absolute
output full current and voltage, use the following equation:
VOUT = IOUT × RLOAD
IOUT =
()
SET
REF
R
K
V
×
where K = 4.2146 constant, VREF = 1.235 V
ADV7177/ADV7178
VREF
DIGITAL
CORE
PIXEL
PORT
300
RSET
75
75
75
VAA
DAC A
DAC B
DAC C
00228-065
OUTPUT
BUFFER
OUTPUT
BUFFER
OUTPUT
BUFFER
Figure 65. Output DAC Buffering Configuration
AD8051
VCC–
OUTPUT TO
TV MONITOR
INPUT/
OPTIONAL
FILTER O/P
5
2
3
1
4
VCC+
00228-066
Figure 66. 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
ADV7178 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Integrated Digital CCIR-601 to PAL/NTSC Video Encoder
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(chēng):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
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