参数资料
型号: ADV7177KSZ
厂商: Analog Devices Inc
文件页数: 37/44页
文件大小: 0K
描述: IC DAC VIDEO NTSC 3-CH 44MQFP
产品变化通告: ADV7xxx Obsolescence 16/Jan/2012
标准包装: 96
类型: 视频编码器
应用: 机顶盒,电视
电压 - 电源,模拟: 3 V ~ 3.6 V
安装类型: 表面贴装
封装/外壳: 44-QFP
供应商设备封装: 44-MQFP(10x10)
包装: 托盘
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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相关代理商/技术参数
参数描述
ADV7177KSZ-REEL 功能描述:IC DAC VIDEO NTSC 3-CH 44MQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 编码器,解码器,转换器 系列:- 产品变化通告:Development Systems Discontinuation 26/Apr/2011 标准包装:1 系列:- 类型:编码器 应用:DVB-S.2 系统 电压 - 电源,模拟:- 电压 - 电源,数字:- 安装类型:- 封装/外壳:模块 供应商设备封装:模块 包装:散装 其它名称:Q4645799
ADV7178 制造商:AD 制造商全称: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 制造商全称:Analog Devices 功能描述:Chip Scale PAL/NTSC Video Encoder with Advanced Power Management