00h through the I<" />
參數(shù)資料
型號(hào): MAX4397SCTM+T
廠商: Maxim Integrated Products
文件頁(yè)數(shù): 7/30頁(yè)
文件大小: 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(biāo)準(zhǔn)包裝: 2,500
類型: 開關(guān)
應(yīng)用: DVD,機(jī)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 MAX4397 switches 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.
MAX4397
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. MAX4397S Audio Section Features Singled-Ended Encoder Input
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