- 您现在的位置：买卖IC网 > PDF目录98183 > TC90A80N Y/C SEPARATOR IC, PDIP28 PDF资料下载
参数资料
| 型号： | TC90A80N |
| 元件分类： | 信号分离 |
| 英文描述： | Y/C SEPARATOR IC, PDIP28 |
| 封装： | 0.400 INCH, 1.78 MM PITCH, PLASTIC, SDIP-28 |
| 文件页数： | 2/23页 |
| 文件大小： | 378K |
| 代理商： | TC90A80N |
TC90A80N/F
2002-12-04
10
Functions
Bus Setting
Function
Skew
Y/C
Sep
C-
Delay Drang
CK
Select
CNR
YNR
Y-
EQ/NC
V-
Emph Skew
Killer
P-
M/H
Sync
output
Y/C
MIX
Y-
OUT
C-
OUT
OFF
Y
C
OFF
3 Line
Comb
Sep
O
C-N.C
×
O
×
O
C.Sync
ON
Y/C
Mute
OFF
Y
C
YCS
(composite video
signal input)
ON
BPF
Sep
O
C-N.C
×
O
HDPV
ON
Y/C
Mute
OFF
Y
C
OFF
×
O
×
O
C.Sync
ON
Y/C
Mute
OFF
Y
C
NR
(Y and C input
independently)
ON
×
O
C-N.C
×
O
×
O
HDPV
ON
Y/C
Mute
O: Specified, ×: Not specified
Description of Functions
(1) 3-line Y/C separation circuit (VTR Record Mode)
Provides clear Y and C separation using a dynamic comb filter, which logically extracts the chrominance signal, based on
the result of detecting vertical 3-line non correlation using two 1-H delay lines.
Also incorporates a vertical edge enhancer with coring function, which produces a clearer record signal with suppressed
noise.
(2) YNR and CNR circuits (VTR Playback Mode)
Independently incorporates cyclic noise reduction using 1-H delay lines for Y and C, effectively reducing vertical
non-correlation noise in the playback signal.
(3) Skew corrector (Special Playback Mode for VHS VTR ×5 speed videotape)
From composite sync pulse signal (sync separation output) detects horizontal skew in units of 0.2 H (×2 = 0.4 H before
and after Cue/Rev noise bar) generated at special playback of VHS VTR ×5 speed videotape. Using the detection result,
automatically corrects horizontal skew included in the input playback video signal by switching the delay time for line
memory.
This function can be used for both composite video signals and independently-applied Y and C signals.
1) Pseudo vertical (PV) signal and composite signal necessary for detecting skew
Based on the reference signal of the horizontal frequency generated from the input composite sync signal, detects the
position of input sync signal in units of 0.2 H. Because skew is detected due to the noise included in the input
composite signal, apply the composite sync signal from which noise is reduced to some extent at sync separation (no
filter in the IC).
Note that erroneous skew detection around the period where vertical sync signal is included can be prevented by
halting skew detection and by setting PLL to the fh as reference during the PV pulse period. So, apply pseudo vertical
signal.
2) Supplementary function: pin 17 (HDPVOUT)
In Skew Correction Mode, pin 17 drives out the HD pulse (width: approx. 4 s) which synchronizes with the video
signal after skew correction; in modes other than Skew Correction, pin 17 drives out the input composite sync signal.
Pin 17 can also be used for output with the input PV mixed using the I2C bus (in Skew Correction Mode only). Use pin
17 for later-stage circuit such as 3DNR. Note, however, that since the HD lock position and jitter performance are not
designed for high precision, do not use pin 17 directly for circuits requiring high precision.
3) Recommended use conditions (eg, search speed)
Since the skew amount is not the same for Cue/Rev with ×5 speed tape, depending on the search speed, after skew
correction, horizontal synchronization may become inconsistent at junctions between fields. As a result, the time for
each field differs and vertical synchronization degrades.
To avoid this phenomenon, it is necessary to select a search speed where four types of skew comprise a cycle during a
1-V pulse period (excluding PV pulse period). Consider a search speed with no or not much degradation of vertical
synchronization, paying attention to the position of the noise bar.
(Example): In ×11 Cue Mode, skew for the 1-V pulse period consists of Skew 0 H → noise → skew 0.4 H → noise →
skew 0.8 H → noise → skew 0.2 H → noise → skew 0.6 H → noise → skew 0 H. Where, consistency of
horizontal synchronization is maintained. Degradation of vertical synchronization can also be made less
conspicuous visually by increasing the search speed.
相关PDF资料 |
PDF描述 |
|---|---|
| TC90A92AFG | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| TC9163AN | SPECIALTY ANALOG CIRCUIT, PDIP28 |
| TC9164AF | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| TC9162AF | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| TC9181P | PLL FREQUENCY SYNTHESIZER, 10 MHz, PDIP18 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC90A92AFG | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:3D comb & Video Decoder |
| TC90L01NG | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Audio/Video Switching IC for TVs |
| TC9106BP | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:TC9106BP CB TRANSCEIVER PLL FREQUENCY SYNTHESIZER |
| TC9109BP | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:TC9109BP CB TRANSCEIVER PLL FREQUENCY SYNTHESIZER |
| TC911 | 制造商:TELCOM 制造商全称:TelCom Semiconductor, Inc 功能描述:AUTO-ZEROED OPERATIONAL AMPLIFIERS |
发布紧急采购，3分钟左右您将得到回复。