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TDA7468 데이터시트 PDF : 부품 기능 및 핀배열

부품번호 TDA7468
기능 TWO BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR
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TDA7468 데이터시트 및 TDA7468 PDF

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TDA7468 pdf, 반도체, 판매, 대치품
TDA7468
ELECTRICAL CHARACTERISTICS
(refer to the test circuit Tamb = 25°C, VS = 9V, f = 1KHz all controls flat (G = 0dB), unless otherwise
specified)
Symbol
SUPPLY
Parameter
Test Condition
Min. Typ. Max. Unit
VS
IS
SVR
Supply Voltage
Supply Current
Ripple Rejection
5 9 10 V
9 mA
60 90
dB
INPUT STAGE
RIN Input Resistance
VCL Clipping Level
SIN Input Separation
Ginmin Minimum Input Gain
Ginmax Maximum Input Gain
Gstep Step Resolution
MIC
RIN Input Resistance
Gmic1 Mic Input Gain 1
Gmic2 Mic Input Gain 2
Gmic3 Mic Input Gain 3
Gmin4 Mic Input Gain 4
MIXmic Mixing Rate
SURROUND
Rin Input Resistance
Ginmin Minimum Input Gain
Ginmax Maximum Input Gain
GinV Inverting Gain
Mixmin Minimum Mixing Rate
Mixmax Maximum Mixing Rate
Crosstal Crosstalk of Mux Output to 100%
k IS
Gbuffer Buffer Gain
VOLUME CONTROL
THD = 0.3%
35 50 65 K
2 2.5
Vrms
80 100
dB
-1 0
1 dB
14 dB
2 dB
35 50 65 K
14 dB
10 dB
6 dB
0 dB
50 %
35 50 65 K
-1 0
1 dB
12 dB
-1
0%
100 %
40 dB
6 dB
CRANGE1 Vol 1 Control Range
AVMAX1 Vol 1 Max. Attenuation
ASTEP1 Vol 1 Step Resolution
Match1 Matching
CRANGE2 Vol 2 Control Range
AVMAX2 Vol 2 Max. Attenuation
ASTEP2 Vol 2 Step Resolution
Match2 Matching
63
61 63 65
0.5 1 1.5
TBD
24
22 24 26
789
TBD
dB
dB
dB
dB
dB
dB
dB
dB
AVMAX1+ Vol 1 + Vol 2 Max Attenuation
AVMAX2
84 dB
4/23

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TDA7468 전자부품, 판매, 대치품
TDA7468
3 APPLICATION SUGGESTIONS
The first and the last stages are volume control blocks. The control range is 0 to -63dB (mute) with 1dB
step resolution for this first one, 0 to 24dB (mute) with 8dB step resolution for the last one.
The very high resolution allows the implementation of systems free from any noisy acoustical effect.
The TDA7468D audioprocessor provides 2 bands tones control.
3.1 Bass, Stages
The Bass cell has an internal resistor Ri = 44Ktypical.
Several filter types can be implemented, connecting external components to the Bass IN and OUT pins.
The fig.5 refers to basic T Type Bandpass Filter starting from the filter component values (R1 internal and
R2,C1,C2 external) the centre frequency Fc, the gain Av at max. boost and the filter Q factor are computed
as follows:
FC
=
--------------------------------1---------------------------------
2 ⋅ π ⋅ R1 R2 C1 C2
AV = R-----2------C-R---2-2----+--C---R-1----2-+----C-R---1--2---+--C---R--2---i---C-----1--
Q = -----RR----2-1-----C--R--1---2--+-----R-C----2-1----C----C2----2--
Viceversa, once FC, AV, and Ri internal value are fixed, the external components values will be:
C1
=
-------------A----V-----–-----1--------------
2 ⋅ π ⋅ FC Ri Q
C2 = ------Q----2--------C----1-------
AV 1 Q2
R2 = -2-------π--------C-----A1----V----F-–---C-1-----–--(--A-Q---V-2----–-----1---)-------Q---
3.2 Treble Stage
The treble stage is a high pass filter whose time constant is fixed by an internal resistor (25Ktypical) and
an external capacitor connected between treble pins and ground.
3.3 CREF
The suggested 10µF reference capacitor (CREF) value can be reduced to 4.7µF if the application requires
faster power ON.
Figure 5.
Ri internal
IN OUT
C1 C2
R2
D95AU313
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