TDA8745 データシートの表示（PDF） - Philips Electronics
部品番号
コンポーネント説明
一致するリスト
TDA8745 Datasheet PDF : 40 Pages
| |||
Philips Semiconductors
Satellite sound receiver with I2C-bus control
Preliminary specification
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 Ω 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.
fmod = modulating frequency.
∆fM = frequency deviation of the main Channel.
∆fS1 = frequency deviation of secondary Channel 1 (left).
∆fS2 = frequency deviation of secondary Channel 2 (right).
fOM = carrier frequency of main Channel.
fOS1 = carrier frequency of secondary Channel 1.
fOS2 = 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, h0alfpage
transfer
(dB)
4
MBE284
0 dB
8
12
16
20 dB
20
24
10
102
10 3
10 4 f (Hz) 10 5
8
hatnradnbosofek,r halfpage
(dB)
4
0
4
8
12
16
10
102
MBE285
flat
J17
50 µs
75 µs
10 3
10 4 f (Hz) 10 5
Fig.4 Noise reduction transfer as function of
input level.
1996 Mar 11
10
Fig.5 LF de-emphasis curves.
Share Link: 