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參數(shù)資料
| 型號： | TDA8745H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Satellite sound receiver with I2C-bus control |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 文件頁數(shù)： | 10/40頁 |
| 文件大?。?/td> | 261K |
| 代理商： | TDA8745H |
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1996 Mar 11
10
Philips Semiconductors
Preliminary specification
Satellite sound receiver with I
2
C-bus control
TDA8745
Output pins 23 and 22 can be muted by setting the
OML and OMR signals to logic 1. In addition, automatic
muting is also possible, the presence detector (as
described in Section “Presence detector”) sets the PDL bit
(PDR for other channel). Absence of a carrier at the
selected frequency results in automatic muting. This
mechanism is enabled or inhibited by the PDM bit
(Presence Detector auto Mute).
All outputs (pins 21, 22 and 23) are line drivers with
SCART level capability and are short-circuit protected by
means of 125
output resistors. Pins 34 and 30 are also
line drivers at SCART level and can be used as signal
outputs before the IC’s output selection (i.e. for decoder
box use).
ABBREVIATIONS
BPF = Band-Pass Filter.
f
mod
= modulating frequency.
f
M
= frequency deviation of the main Channel.
f
S1
= frequency deviation of secondary Channel 1 (left).
f
S2
= frequency deviation of secondary Channel 2 (right).
f
OM
= carrier frequency of main Channel.
f
OS1
= carrier frequency of secondary Channel 1.
f
OS2
= carrier frequency of secondary Channel 2.
IF = Intermediate Frequency.
IL = Input Left.
IR = Input Right.
LPF = Low-Pass Filter.
NR = Noise Reduction.
OML = Output Mute Left.
OMR = Output Mute Right.
OS = Output Select.
PDM = Presence Detector auto Mute.
PE = Port Extension.
PLL = Phase-Locked Loop.
POR = Power-On Reset.
S/N = Signal-to-Noise ratio.
VCO = Voltage Controlled Oscillator.
handbook, halfpage
(dB)
10
5
MBE284
10
4
10
3
10
2
10
4
8
12
16
20
24
f (Hz)
20 dB
0 dB
Fig.4
Noise reduction transfer as function of
input level.
handbook, halfpage
(dB)
10
5
MBE285
10
4
10
3
10
2
10
4
0
4
8
12
16
f (Hz)
50
μ
s
75
μ
s
flat
J17
Fig.5 LF de-emphasis curves.
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