参数资料
型号: TB1311AFG
元件分类: 信号分离
英文描述: SYNC SEPARATOR IC, PQFP80
封装: 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80
文件页数: 17/46页
文件大小: 948K
代理商: TB1311AFG
TB1311AFG
2006-05-29
24
No-input detection
This function detects whether there is input or not. It is useful for detecting no-input of 525i or 625i even if which is a
weakened signal strength.
(1)0 (no-input)
1 (detected)
When Nmin ≦ N1 ≦ Nmax, and when N2 ≧ Ndet, SIG DET returns 1.
Where, Nmin: the number set by H COUNT MIN
Nmax: the number set by H COUNT MAX
Ndet: the number set by SIG DET N
N1: the number of the H-sync count in the counter during an internal window (approx. 2 ms)
N2: the number of conditions that “Nmin ≦ N1 ≦ Nmax”
is detected
(2) 1 (detected)
0 (no-input)
When N1 ≦ Nmin, N1 ≧ Nmax, and when N3 ≧ Nreset, SIG DET returns 0.
Where, Nreset: the number set by SIG RESET N
N3: the number of conditions that “N1 ≦ Nmin and N1 ≧ Nmax” is detected
Ex
t.
C
ap
.
SYN
C
F
IL
TE
R
pin
Fig. Block diagram for no-input detection
Decide how to use no-input detection after making a thorough evaluation using a prototype TV set.
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