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Электронный компонент: TDA7440D

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1/17
TDA7440D
April 1999
1
FEATURES
INPUT MULTIPLEXER
4 STEREO INPUTS
SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
ONE STEREO OUTPUT
TREBLE AND BASS CONTROL IN 2.0dB
STEPS
VOLUME CONTROL IN 1.0dB STEPS
TWO SPEAKER ATTENUATORS:
TWO INDEPENDENT SPEAKER CONTROL
IN 1.0dB STEPS FOR BALANCE FACILITY
INDEPENDENT MUTE FUNCTION
ALL FUNCTION ARE PROGRAMMABLE VIA
SERIAL BUS
2
DESCRIPTION
The TDA7440D is a volume tone (bass and treble)
balance (Left/Right) processor for quality audio
applications in Hi-Fi systems.
Selectable input gain is provided. Control of all the
functions is accomplished by serial bus.
The AC signal setting is obtained by resistor net-
works and switches combined with operational
amplifiers.
Thanks to the used BIPOLAR/CMOS Technology,
Low Distortion, Low Noise and DC stepping are
obtained
TONE CONTROL
DIGITALLY CONTROLLED AUDIO PROCESSOR
Figure 2. Block Diagram
0/30dB
2dB STEP
MUXOUTL
INL
VOLUME
VOLUME
TREBLE
TREBLE
TREBLE(L)
MUXOUTR
INR
TREBLE(R)
BOUT(L)
SPKR ATT
LEFT
LOUT
SCL
SDA
DIG_GND
ROUT
D98AU883
I
2
CBUS DECODER + LATCHES
100K
100K
100K
100K
G
L-IN1
L-IN2
L-IN3
L-IN4
100K
100K
100K
100K
R-IN1
R-IN2
R-IN3
R-IN4
G
INPUT MULTIPLEXER
+ GAIN
BASS
BIN(L)
BASS
SPKR ATT
RIGHT
BOUT(R)
BIN(R)
SUPPLY
CREF
AGND
V
S
27
4
5
6
7
3
2
1
28
21
22
20
26
24
25
10
11
19
12
13
23
8
9
18
14
15
R
B
R
B
V
REF
Figure 1. Package
Table 1. Order Codes
Part Number
Package
TDA7440D
SO-28
TDA7440D013TR
Tape & Reel
SO-28
REV. 3
TDA7440D
2/17
Figure 3. Pin Connection (Top view)
Table 2. Absolute Maximum Ratings
Table 3. Thermal Data
Table 4. Quick Reference Data
Symbol
Parameter
Value
Unit
V
S
Operating Supply Voltage
10.5
V
T
amb
Operating Ambient Temperature
0 to 70
C
T
stg
Storage Temperature Range
-55 to 150
C
Symbol
Parameter
Value
Unit
R
th j-pin
Thermal Resistance Junction-pins
85
C/W
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
S
Supply Voltage
6
9
10.2
V
V
CL
Max. input signal handling
2
Vrms
THD
Total Harmonic Distortion V = 1Vrms f = 1KHz
0.01
0.1
%
S/N
Signal to Noise Ratio V
out
= 1Vrms (mode = OFF)
106
dB
S
C
Channel Separation f = 1KHz
90
dB
Input Gain in (2dB step)
0
30
dB
Volume Control (1dB step)
-47
0
dB
Treble Control (2dB step)
-14
+14
dB
Bass Control (2dB step)
-14
+14
dB
Balance Control 1dB step
-79
0
dB
Mute Attenuation
100
dB
L_IN3
L_IN4
MUXOUTL
IN(L)
MUXOUT(R)
BIN(R)
IN(R)
BOUT(R)
BIN(L)
1
3
2
4
5
6
7
8
9
BOUT(L)
N.C.
N.C.
TREBLE(R)
TREBLE(L)
SCL
SDA
DIG-GND
CREF
23
22
21
20
19
17
18
16
15
D98AU884
10
11
12
13
14
28
27
26
25
24
R_IN3
R_IN2
R_IN1
L_IN1
L_IN2
V
S
AGND
ROUT
LOUT
R_IN4
3/17
TDA7440D
Table 5. Electrical Characteristcs
Refer to the test circuit T
amb
= 25C, V
S
= 9V, R
L
= 10K
, R
G
= 600
, all controls flat (G = 0dB), unless
otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
SUPPLY
V
S
Supply Voltage
6
9
10.2
V
I
S
Supply Current
4
7
10
mA
SVR
Ripple Rejection
60
90
dB
INPUT STAGE
R
IN
Input Resistance
70
100
130
K
V
CL
Clipping Level
THD = 0.3%
2
2.5
Vrms
S
IN
Input Separation
The selected input is grounded
through a 2.2
capacitor
80
100
dB
G
inmin
Minimum Input Gain
-1
0
1
dB
G
inman
Maximum Input Gain
29
30
31
dB
G
step
Step Resolution
1.5
2
2.5
dB
VOLUME CONTROL
R
i
Input Resistance
20
33
50
K
C
RANGE
Control Range
45
47
49
dB
A
VMAX
Max. Attenuation
45
47
49
dB
A
STEP
Step Resolution
0.5
1
1.5
dB
E
A
Attenuation Set Error
A
V
= 0 to -24dB
-1.0
0
1.0
dB
A
V
= -24 to -47dB
-1.5
0
1.5
dB
E
T
Tracking Error
A
V
= 0 to -24dB
0
1
dB
A
V
= -24 to -47dB
0
2
dB
V
DC
DC Step
adjacent attenuation steps from
0dB to A
V
max
0
0.5
3
mV
mV
A
mute
Mute Attenuation
80
100
dB
BASS CONTROL (1)
Gb
Control Range
Max. Boost/cut
+12.0
+14.0
+16.0
dB
B
STEP
Step Resolution
1
2
3
dB
R
B
Internal Feedback Resistance
33
44
55
K
TREBLE CONTROL (1)
Gt
Control Range
Max. Boost/cut
+13.0
+14.0
+15.0
dB
T
STEP
Step Resolution
1
2
3
dB
SPEAKER ATTENUATORS
C
RANGE
Control Range
70
76
82
dB
S
STEP
Step Resolution
0.5
1
1.5
dB
E
A
Attenuation Set Error
A
V
= 0 to -20dB
-1.5
0
1.5
dB
A
V
= -20 to -56dB
-2
0
2
dB
V
DC
DC Step
adjacent attenuation steps
0
3
mV
A
mute
Mute Attenuation
80
100
dB
NOTE1:
1) The device is functionally good at Vs = 5V. a step down, on Vs, to 4V does't reset the device.
2) BASS and TREBLE response: The center frequency and the response quality can be chosen by the external circuitry.
TDA7440D
4/17
Figure 4. Test Circuit
AUDIO OUTPUTS
V
CLIP
Clipping Level
d = 0.3%
2.1
2.6
Vrms
R
L
Output Load Resistance
2
K
R
O
Output Impedance
10
30
50
V
DC
DC Voltage Level
3.5
3.8
4.1
V
GENERAL
E
NO
Output Noise
All gains = 0dB;
5
15
V
BW = 20Hz to 20KHz flat
E
t
Total Tracking Error
A
V
= 0 to -24dB
0
1
dB
A
V
= -24 to -47dB
0
2
dB
S/N
Signal to Noise Ratio
All gains 0dB; V
O
= 1Vrms
95
106
dB
S
C
Channel Separation Left/Right
80
100
dB
d
Distortion
A
V
= 0; V
I
= 1Vrms
0.01
0.08
%
BUS INPUT
V
IL
Input Low Voltage
1
V
V
IH
Input High Voltage
3
V
I
IN
Input Current
V
IN
= 0.4V
-5
0
5
A
V
O
Output Voltage SDA
Acknowledge
I
O
= 1.6mA
0.4
0.8
V
Table 5. Electrical Characteristcs (continued)
Refer to the test circuit T
amb
= 25C, V
S
= 9V, R
L
= 10K
, R
G
= 600
, all controls flat (G = 0dB), unless
otherwise specified.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
10
F
5.6nF
100nF
100nF
5.6K
2.2
F
5.6nF
2.2
F
100nF
100nF
5.6K
0.47
F
0.47
F
0.47
F
0.47
F
0.47
F
0.47
F
0.47
F
0.47
F
0/30dB
2dB STEP
MUXOUTL
INL
VOLUME
VOLUME
TREBLE
TREBLE
TREBLE(L)
MUXOUTR
INR
TREBLE(R)
BOUT(L)
SPKR ATT
LEFT
LOUT
SCL
SDA
DIG_GND
ROUT
D98AU885
I
2
CBUS DECODER + LATCHES
100K
100K
100K
100K
G
L-IN1
L-IN2
L-IN3
L-IN4
100K
100K
100K
100K
R-IN1
R-IN2
R-IN3
R-IN4
G
INPUT MULTIPLEXER
+ GAIN
BASS
BIN(L)
BASS
SPKR ATT
RIGHT
BOUT(R)
BIN(R)
SUPPLY
CREF
AGND
V
S
27
4
5
6
7
3
2
1
28
21
22
20
26
24
25
10
11
19
12
13
23
8
9
18
14
15
R
B
R
B
V
REF
5/17
TDA7440D
3
APPLICATION SUGGESTIONS
The first and the last stages are volume control blocks. The control range is 0 to -47dB (mute) for the first
one, 0 to -79dB (mute) for the last one. Both of them have 1dB step resolution. The very high resolution
allows the implementation of systems free from any noisy acoustical effect.
The TDA7440D audioprocessor provides 3 bands tones control.
3.1 Bass Stage
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:
Viceversa, once Fc, Av, and Ri internal value are fixed, the external components values will be:
Figure 5.
Treble Stage
The treble stage is a high pass filter whose time constant is fixed by an internal resistor (25K
typical) and
an external capacitor connected between treble pins and ground.
Typical responses are reported in Figg. 14 to 17.
CREF
The suggested 10mF reference capacitor (CREF) value can be reduced to 4.7mF if the application re-
quires faster power ON.
F
C
1
2
R1 R2 C1 C2
-----------------------------------------------------------------
=
A
V
R2 C2
R2 C1
R
i
C1
+
+
R2 C1
R2 C2
+
----------------------------------------------------------------
=
Q
R1 R2 C1 C2
R2 C1
R2 C2
+
--------------------------------------------------
=
C1
A
V
1
2
F
C
R
i
Q
------------------------------------------
C2
Q
2
C1
A
V
1
Q
2
------------------------------
R2
A
V
1
Q
2
2
C1 F
C
A
V
1
(
)
Q
-----------------------------------------------------------------------
=
=
=
Ri internal
C
2
OUT
IN
C
1
R
2
D95AU313