參數(shù)資料
型號： TDA9874AH
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： Digital TV sound demodulator/decoder
中文描述： AM/FM, AUDIO DEMODULATOR, PQFP44
封裝： 14 X 14 MM, 2.20 MM HEIGHT, PLASTIC, SOT-205-1, QFP-44
文件頁數(shù)： 14/68頁
文件大小： 231K
代理商： TDA9874AH
1999 Dec 03
14
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874A
6.3
Description of the analog audio section
6.3.1
A
NALOG CROSSBAR SWITCH AND ANALOG MATRIX
The TDA9874A has one external analog stereo input, one
mono input, one 2-channel and one single-channel output
port. Analog source selector switches are employed to
provide the desired analog signal routing capability, which
is done by the analog crossbar switch section.
The basic signal routing philosophy of the TDA9874A is
that each switch handles two signal channels at the same
time (e.g. left and right, language A and B) directly at the
source. For an overview of the signal flow see Fig.7.
Each source selector switch is followed by an analog
matrix to perform further selection tasks, such as putting a
signal from one input channel, say language A, to both
output channels or for swapping left and right channels.
The analog matrix provides the functions given in Table 5.
Automatic matrixing for TV applications is also supported.
All switches and matrices are controlled via the I
2
C-bus.
Table 5
Analog matrix functions
6.3.2
E
XTERNAL AND MONO INPUTS
The external and mono inputs accept signal levels of up to
1.4 V (RMS). By adding external series resistors to
provide suitable attenuation, the external input could be
used as a SCART input. Whenever the external or mono
input is selected, the output of the DAC is muted to
improve the crosstalk performance.
6.3.3
A
UDIO
DAC
S
The TDA9874A comprises a 2-channel audio DAC and an
additional single-channel audio DAC for feeding signals
fromtheDSPsection to theanalogcrossbarswitch.These
DACs have a resolution of 15 bits and employ four-times
oversampling and noise shaping.
6.3.4
A
UDIO OUTPUT BUFFERS
The output buffers provide a gain of 0 dB and offer a
muting possibility. The post filter capacitors of the audio
DACs are connected to the buffer outputs.
6.3.5
S
TANDBY MODE
The standby mode (see Section 10.3.3) disables most
functions and reduces power dissipation of the
TDA9874A. It provides no other function.
Internal registers may lose their information in standby
mode. Therefore, the device needs to be initialized on
returningtonormaloperation.Thiscanbeaccomplishedin
the same way as after a Power-on reset.
MODE
MATRIX OUTPUT
L OUTPUT
R OUTPUT
1
2
3
4
L input
R input
L input
R input
R input
L input
L input
R input
handbook, full pagewidth
MHB589
OUTR
source select
matrix
mono (AM)
EXTIL
EXTIR
DACL
DACR
DACM
OUTL
OUTM
Fig.6 Switch diagram for the analog audio section.
相關(guān)PDF資料
PDF描述
TDA9874APS Digital TV sound demodulator/decoder
TDCS6440G SONET/SDH 40 Gbits/s Cross Connect( SONET/SDH 40G位/秒交叉連接器件)
TDK5100F 434 MHz ASK/FSK Transmitter in 10-pin Package
TDK5100 ASK/FSK Transmitter 868/433 MHz
TE28F004S3-150 BYTE-WIDE SMART 3 FlashFile MEMORY FAMILY 4, 8, AND 16 MBIT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA9874AH/V2,557 功能描述:音頻放大器 DIGITAL STEREO DECODER VCR 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
TDA9874AHB 功能描述:音頻放大器 DIGITAL STEREO DECODER VCR 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
TDA9874APS 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder
TDA9874H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder
TDA9875 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*