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參數(shù)資料
| 型號： | MAX4397S |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Audio/Video Switch For Dual SCART Connectors |
| 中文描述： | 音頻/視頻開關(guān)，用于雙SCART連接器 |
| 文件頁數(shù)： | 13/30頁 |
| 文件大?。?/td> | 834K |
| 代理商： | MAX4397S |
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Video Outputs
The DC level at the video outputs is controlled so that
coupling capacitors are not required, and all of the
video outputs are capable of driving a DC-coupled,
150
, back-terminated coax load with respect to
ground. Since some televisions and VCRs use the hori-
zontal sync height for automatic gain control, the
MAX4397 accurately reproduces the sync height to
within ±2%.
Slow Switching
The MAX4397 supports the IEC 933-1, Amendment 1,
tri-level slow switching that selects the aspect ratio for
the display (TV). Under I
2
C-compatible control, the
MAX4397 sets the slow-switching output voltage level.
Table 1 shows the valid input levels of the slow-switch-
ing signal and the corresponding operating modes of
the display device.
Two bidirectional ports are available for slow-switching
signals for the TV and VCR. The slow-switching input
status is continuously read and stored in the register
0Eh. The slow-switching outputs can be set to a logic
level or high impedance by writing to registers 07h and
09h. See Tables 8 and 10 for details.
Fast Switching
The VCR or MPEG decoder outputs a fast-switching
signal to the display device or TV to insert on-screen
display (OSD). The fast-switching signal can also be
set to a constant high or low output signal through the
I
2
C interface. The fast-switching output can be set
through writing to register 07h.
Y/C Mixer
The MAX4397 includes an on-chip mixer to produce
Composite video (CVBS) when S-video (Y and C) is
present. The Composite video drives the
RF_CVBS_OUT output pin. The circuit sums Y and C
signals to obtain the CVBS component. A +6dB output
buffer drives RF_CVBS_OUT.
Video Reconstruction Filter
The encoder DAC outputs need to be lowpass-filtered
to reject the out-of-band noise. The MAX4397 inte-
grates the reconstruction filter. The filter is fourth order,
which is composed of two Sallen-Key biquad in cas-
cade, implementing a Butterworth-type transfer func-
tion. The internal reconstruction filters feature a 6MHz
cutoff frequency, and -35dB minimum attenuation at
27MHz. Note that the SET pin is used to set the accura-
cy of the filter cutoff frequency. Connect a 100k
resis-
tor from SET to ground.
SCART Audio Switching
Audio Inputs
All audio inputs for the MAX4397S are single-ended
and are AC-coupled. The MAX4397D audio inputs are
singled-ended and AC-coupled except for the audio
encoder input, which is differential DC-coupled.
The audio block has three stereo audio inputs from the
TV, the VCR, and the MPEG decoder SCART. Each
input has a 100k
resistor connected to an internally
generated voltage equal to 0.23 x V
12
, except for the
encoder input of the MAX4397D, where the DC bias is
fixed externally.
M
Audio/Video Switch for Dual SCART Connectors
______________________________________________________________________________________
13
Table 1. Slow-Switching Modes
SLOW-SWITCHING
SIGNAL VOLTAGE
(V)
MODE
0 to 2
Display device uses an internal source
such as a built-in tuner to provide a
video signal
4.5 to 7.0
Display device uses a video signal from
the SCART connector and sets the
display to 16:9 aspect ratio
9.5 to 12.6
Display device uses a signal from the
SCART connector and sets the display
to 4:3 aspect ratio
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4397SACTM+ | 功能描述:視頻開關(guān) IC Audio/Video Switch for Dual SCART Con RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| MAX4397SACTM+T | 功能描述:視頻開關(guān) IC Audio/Video Switch for Dual SCART Con RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| MAX4397SCTM | 功能描述:視頻開關(guān) IC RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| MAX4397SCTM+ | 功能描述:視頻開關(guān) IC Audio/Video Switch for Dual SCART Con RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| MAX4397SCTM+T | 功能描述:視頻開關(guān) IC Audio/Video Switch for Dual SCART Con RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關(guān)閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
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