參數(shù)資料
型號(hào)： TDA9855
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： I2C-bus controlled BTSC stereo/SAP decoder and audio processor
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP52
封裝： 0.600 INCH, PLASTIC, SOT-274-1, SDIP-52
文件頁(yè)數(shù)： 37/52頁(yè)
文件大?。?/td> 345K
代理商： TDA9855
1997 Nov 04
37
Philips Semiconductors
Product specification
I
2
C-bus controlled BTSC stereo/SAP
decoder and audio processor
TDA9855
APPLICATION HINTS
Selection of input signals by using the zero-crossing mute mode
(see Fig.11)
A selection between the internal signal path and the external input LIL/LIR produces a modulation click depending on the
difference of the signal values at the time of switching.
At t
1
the maximum possible difference between signals is 7 V (p-p) and gives a large click. Using the zero-crossing
detector no modulation click is audible.
For example: The selection is enabled at t
1
, the microcontroller sets the zero-crossing bit (TZCM = 1) and then the mute
bit (GMU = 1) via the I
2
C-bus. The output signal follows the input A signal, until the next zero-crossing occurs and then
activates mute.
After a fixed delay time before t
2
, the microcontroller has to send the forced mute mode (TZCM = 0) and the return to the
zero-crossing mode (TZCM = 1) to be sure that mute is enabled.
The output signal remains muted until the next signal zero-crossing of input B occurs, and then follows that signal.
The delay time t
2
t
1
is e.g. 40 ms. The zero-crossing function is working at the lowest frequency of 40 Hz.
Fig.11 Zero-crossing function; only one channel shown.
handbook, full pagewidth
V
t
t1
4
0
1
2
3
4
1
2
3
t2
MED436
(1)
(2)
(3)
(1) Input A (internal signal).
(2) Output.
(3) Input B (external input signal).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA9855/V2,112 功能描述:音頻放大器 BTSC STEREO DECODER RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA9855N 功能描述:音頻放大器 BTSC STEREO DECODER DBXTV/AUD RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA9855WP 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:I2C-bus controlled BTSC stereo/SAP decoder and audio processor
TDA9859 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal hi-fi audio processor for TV
TDA9859H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal hi-fi audio processor for TV
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