参数资料
型号: ADV7188BSTZ
厂商: Analog Devices Inc
文件页数: 24/112页
文件大小: 0K
描述: IC DECODER VID MULTIFORM 80LQFP
标准包装: 1
类型: 视频解码器
应用: 机顶盒,视频播放器,录音机
电压 - 电源,模拟: 3.15 V ~ 3.45 V
电压 - 电源,数字: 1.65 V ~ 2 V
安装类型: 表面贴装
封装/外壳: 80-LQFP
供应商设备封装: 80-LQFP(14x14)
包装: 托盘
ADV7188
Rev. A | Page 19 of 112
Fast Blank and Contrast Reduction
Programmable Thresholds
The internal fast blank and contrast reduction signals are
resolved from the trilevel FB signal using two comparators, as
shown in Figure 11. To facilitate compliance with different
input level standards, the reference level to these comparators is
programmable via FB_LEVEL [1:0] and CNTR_LEVEL [1:0].
The resulting thresholds are given in Table 15.
FB_LEVEL [1:0], Address 0xF1 [5:4]
These bits control the reference level for the fast blank comparator.
CNTR_LEVEL [1:0], Address 0xF1 [7:6]
These bits control the reference level for the contrast reduction
comparator.
+
PROGRAMMABLE
THRESHOLDS
+
CONTRAST
REDUCTION
COMPARATOR
C
FAST BLANK
COMPARATOR
FAST BLANK
FB PIN
C
N
T
R
_E
NABL
E
CNT
R
_L
E
V
E
L
[1:
0]
F
B
_L
EV
E
L
[1:0
]
05
47
8-
01
1
Figure 11. Fast Blank and Contrast Reduction Programmable Threshold
Table 15. Fast Blank and Contrast Reduction Programmable Threshold I2C Controls
CNTR_ENABLE
FB_LEVEL [1:0]
CNTR_LEVEL [1:0]
Fast Blanking Threshold (V)
Contrast Reduction Threshold (V)
0
00 (default)
XX
1.4
n/a
0
01
XX
1.6
n/a
0
10
XX
1.8
n/a
0
11
XX
2.0
n/a
1
00 (default)
00
1.6
0.4
1
01
1.8
0.6
1
10
2.0
0.8
1
11
2.2
2.0
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