- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄36338 > 93526374557 (NXP SEMICONDUCTORS) FM, AUDIO DEMODULATOR, PQFP44 PDF資料下載
參數(shù)資料
| 型號(hào)： | 93526374557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | PLASTIC, SOT-205, QFP-44 |
| 文件頁數(shù)： | 6/71頁 |
| 文件大小： | 269K |
| 代理商： | 93526374557 |
第1頁第2頁第3頁第4頁第5頁當(dāng)前第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁
2000 Aug 04
14
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
6.3
Description of the analog audio section
6.3.1
ANALOG 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 I2C-bus.
Table 5
Analog matrix functions
6.3.2
EXTERNAL 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
AUDIO DACS
The TDA9874A comprises a 2-channel audio DAC and an
additional single-channel audio DAC for feeding signals
from the DSP section to the analog crossbar switch. These
DACs have a resolution of 15 bits and employ four-times
oversampling and noise shaping.
6.3.4
AUDIO 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
STANDBY MODE
The standby mode (see Section 7.3.3) 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
returning to normal operation. This can be accomplished in
the same way as after a Power-on reset.
MODE
MATRIX OUTPUT
L OUTPUT
R OUTPUT
1
L input
R input
2
R input
L input
3
L input
4
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 |
|---|---|
| 935263897551 | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP32 |
| 935263898112 | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 935263897518 | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP32 |
| 935263898118 | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 935263897557 | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 935264217557 | 制造商:NXP Semiconductors 功能描述:SUB ONLY IC |
| 935267356112 | 制造商:NXP Semiconductors 功能描述:IC TEA1507PN |
| 935268081112 | 制造商:NXP Semiconductors 功能描述:SUB ONLY IC |
| 935268721125 | 制造商:NXP Semiconductors 功能描述:Buffer/Line Driver 1-CH Non-Inverting 3-ST CMOS 5-Pin TSSOP T/R |
| 935269304128 | 制造商:ST-Ericsson 功能描述:IC AUDIO CODEC W/TCH SCRN 48LQFP |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。