00h through the I<" />
參數(shù)資料
型號: MAX4397DCTM+T
廠商: Maxim Integrated Products
文件頁數(shù): 7/30頁
文件大?。?/td> 0K
描述: IC SW A/V SCART CON 48-TQFN
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 2,500
類型: 開關(guān)
應(yīng)用: DVD,機頂盒,電視
安裝類型: 表面貼裝
封裝/外殼: 48-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 48-TQFN-EP(7x7)
包裝: 帶卷 (TR)
To implement the zero-crossing function when switch-
ing audio signals, set the ZCD bit by loading register
00h through the I2C-compatible interface (if the ZCD bit
is not already set). Then set the mute bit low by loading
register 00h. Next, wait for a sufficient period of time for
the audio signal to cross zero. This period is a function
of the audio signal path’s low-frequency 3dB corner
(fL3dB). Thus, if fL3dB = 1kHz, the time period to wait for
a zero-crossing detect is 1/2kHz or 0.5ms.
Next, set the appropriate TV switches using register
01h. Finally, clear the mute bit (while leaving the ZCD bit
high) using register 00h. The MAX4397DA/SA switch the
signal out of mute at the next zero crossing.
To implement the zero-cross function for TV volume
changes, or for TV and phono volume bypass switch-
ing, simply ensure the ZCD bit in register 00h is set.
MAX4397DA/SA
Audio/Video Switch for Dual SCART Connectors
______________________________________________________________________________________
15
AUDIO INPUTS
AUDIO OUTPUTS
ENC_INL
TV_INL
VCR_INL
MUTE
Σ/2
MUTE
MUTE IS AN INTERNAL SIGNAL
-6dB, 0dB, OR +6dB
9.54dB
12.54dB
GNDAUD
9.54dB
ZCD
TV_OUTL
RF_MONO_OUT
TV_OUTR
VOLUME CONTROL BYPASS
VOLUME CONTROL
+6dB TO -56dB
VOLUME CONTROL
+6dB TO -56dB
I2C
VCR_OUTL
VCR_OUTR
9.54dB
ENC_INR
TV_INR
VCR_INR
VOLUME CONTROL BYPASS
Figure 5. MAX4397SA Audio Section Features Singled-Ended Encoder Input
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