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| 型號： | 93526374518 |
| 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)： | 53/71頁 |
| 文件大小： | 269K |
| 代理商： | 93526374518 |
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2000 Aug 04
57
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
Notes
1. Definition of levels and level setting:
a) The full-scale level for analog audio signals is 1.4 V (RMS).
b) The nominal level at the digital crossbar switch is defined at
15 dB (full-scale).
c) Nominal audio input levels: external, mono: 500 mV (RMS);
9 dB (full-scale).
2. Audio performance is limited by the dynamic range of the NICAM 728 system. Due to companding, the quantization
noise is never lower than
62 dB with respect to the input level.
3. FM source; in dual mode only A (respectively B) signal modulated; measured at B (respectively A) channel output;
Vo = 1 V (RMS) of modulated channel.
4. FM source; in stereo mode only L (respectively R) signal modulated; measured at R (respectively L) channel output;
Vo = 1 V (RMS) of modulated channel.
5. If the supply voltage for the TDA9874A is switched off, because of the ESD protection circuitry, all audio input pins
are short-circuited.
6. The Philips crystal (order number 9922 520 20106) is suitable for this application.
Crystal specication (fundamental mode)
fxtal
crystal frequency
note 6
24.576
MHz
CL
load capacitance
20
pF
C1
series capacitance
20
fF
C0
parallel capacitance
7pF
Φ
pull
pulling sensitivity
CL changed from
18 to 16 pF
25
RR
equivalent series resistance
at nominal frequency
30
RN
equivalent series resistance of
unwanted mode
2RR
T
temperature range
20
+25
+70
°C
XJ
adjustment tolerance
±30
106
XD
drift
across temperature range
±30
106
XA
ageing
±5
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
10
6
–
pF
-----------
10
6
–
year
-----------
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