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參數(shù)資料
| 型號： | TDA7402TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44 |
| 文件頁數(shù)： | 10/74頁 |
| 文件大?。?/td> | 1232K |
| 代理商： | TDA7402TR |
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Audioprocessor part
TDA7402
4.1.3
Mono differential Input 1 (MD1)
The MD1 input is designed as a basic differential stage with 56k
Ω input impedance. This
input is configurable as a single ended stereo input (see pin-out).
4.1.4
Mono differential Input 2 (MD2)
The MD2 input has the same topology as MD1, but without the possibility to configure it to
single ended.
4.1.5
Single ended stereo Input (SE1), single ended mono input (AM) and
FM-MPX input
All single ended inputs offer an input impedance of 100k
Ω. The AM pin can be connected by
software to the input of the stereo-decoder in order to use the AM noiseblanker and AM High
Cut feature.
4.2
AutoZero
The AutoZero allows a reduction of the number of pins as well as external components by
canceling any offset generated by or before the In-Gain-stage (Please notice that externally
generated offsets, e.g. generated through the leakage current of the coupling capacitors,
are not canceled).
The auto zeroing is started every time the DATA-BYTE 0 is selected and needs max. 0.3ms
for the alignment. To avoid audible clicks the Audioprocessor is muted before the loudness
stage during this time. The AutoZero feature is only present in the main signal path.
4.2.1
AutoZero for stereo decoder selection
A special procedure is recommended for selecting the stereo decoder at the main input-
selector to guarantee an optimum offset cancellation:
1.
SoftMute or Mute the signal-path
2.
Temporary deselect the stereo decoder at all input selectors
3.
Configure the stereo decoder via IIC-Bus
4.
Wait 1ms
5.
Select the stereo decoder at the main input selector first
The root cause of this procedure is, that after muting the stereo decoder (Step 1), the
internal stereo decoder filters have to settle in order to perform a proper offset cancellation.
4.2.2
AutoZero remain
In some cases, for example if the P is executing a refresh cycle of the I2C Bus
programming, it is not useful to start a new AutoZero action because no new source is
selected and an undesired mute would appear at the outputs. For such applications the
A619 could be switched in the AutoZero Remain Mode (Bit 6 of the subaddress byte). If
this bit is set to high, the DATABYTE 0 could be loaded without invoking the AutoZero and
the old adjustment value remains.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| TDA7403 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:BASIC SIGNAL PROCESSOR |
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| TDA7403D | 功能描述:音頻 DSP Basic Signal Process RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| TDA7403DTR | 功能描述:音頻 DSP Basic Signal Process RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
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