Philips tda7439 DATASHEETS
DIGITALLY CONTROLLED AUDIO PROCESSOR
MUXOUTR INR TREBLE(R)
MIN(R) MOUT(R) BOUT(R)BIN(R)
CREF
Figure 1. Package
T
1FEATURES
■ INPUT MULTI PL EXER
– 4 STEREO INPUTS
– SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
■ ONE STEREO OUTPUT
■ TREBLE, MID DLE AND BASS CONT R OL IN
2.0dB STEPS
■ VOLUME CONTROL IN 1.0dB STEPS
■ TWO SPEAKER ATTENUATORS:
– TWO INDEPENDENT SPEAK ER CONT ROL
IN 1.0dB STEPS FOR BALANCE FACILITY
– INDEPENDENT MUTE FUNCTION
■ ALL FUNCTION ARE PROGRAMMABLE VIA
SERIAL BUS
2DESCRIPTION
The TDA7439 is a volume tone (bass, middle and
treble) balance (Left/Right) processor for quality
TDA7439
THREE BANDS
SDIP30
able 1. Order Codes
Part Number Package
TDA7439 SDIP30
audio applications in car-radio and 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
Figure 2. Block Diagram
June 2004
L-IN1
L-IN2
L-IN3
L-IN4
R-IN1
R-IN2
R-IN3
R-IN4
TREBLE(L)
MIN(L)
TREBLE
I2CBUS DECODER + LATCHES
TREBLE
MIDDLE
MIDDLE
MOUT(L)
R
M
R
M
BIN(L)
BASS
BASS
R
B
R
B
BOUT(L)
SPKR ATT
LEFT
SPKR ATT
RIGHT
V
REF
SUPPLY
6
30
1
29
5
3
4
D95AU342B
LOUT
SCL
SDA
DIG_GND
ROUT
V
S
AGND
G
0/30dB
2dB STEP
G
MUXOUTL INL
15 16 27 26 25 23 24
VOLUME
VOLUME
17 18 28 19 20 21 22 2
11
100K
12
100K
13
100K
14
100K
10
100K
9
100K
8
100K
7
100K
INPUT MULTIPLEXER
+ GAIN
REV. 10
1/19
TDA7439
Figure 3. PIN CONNECTION
1
2
3
V
S
AGND
ROUT MIN(L)
LOUT
R-IN4
R-IN3
R-IN2
R-IN1
L-IN1
L-IN2
L-IN3
L-IN4
MUXOUTL
4
5
6
7
8
9
10
11
12
13
14
15
D95AU340A
30
29
28
27
26
24
23
22
21
20
19
18
17
SCLSDA
DIG_GNDCREF
TREBLE(R)
TREBLE(L)
MOUT(L)25
BOUT(L)
BIN(L)
BOUT(R)
BIN(R)
MOUT(R)
MIN(R)
INR
MUXOUTR
INL16
Table 2. Absolute Maximum Ratings
Symbol Parameter Value Unit
V
T
amb
T
stg
Operating Supply Voltage 10.5 V
S
Operating Ambient Temperature 0 to 70 °C
Storage Temperature Range -55 to 150 °C
Table 3. Thermal Data
Symbol Parameter Value Unit
R
th j-pin
Thermal Resistance Junction-pins 85 °C/W
Table 4. QUICK REFERENCE DATA
Symbol Parameter Min. Typ. Max. Unit
V
S
V
CL
THD Total Harmonic Distortion V = 1Vrms f = 1KHz 0.01 0.1 %
S/N Signal to Noise Ratio V
S
C
Supply Voltage 6 9 10.2 V
Max. input signal handling 2 Vrms
= 1Vrms (mode = OFF) 106 dB
out
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
Middle Control (2dB step) -14 +14 dB
Bass Control (2dB step) -14 +14 dB
Balance Control 1dB step -79 0 dB
Mute Attenuation 100 dB
2/19
TDA7439
Table 5. Electrical Characteristcs (refer to the test circuit T
= 25°C, VS = 9V, RL= 10KΩ, RG = 600Ω,
amb
all controls flat (G = 0dB), unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
SUPPLY
V
SVR Ripple Rejection 60 90 dB
INPUT STAGE
R
V
S
inmin Minimum Input Gain -1 0 1 dB
G
G
inman
G
VOLUME CONTROL
C
RANGE
A
VMAX
A
STEP
E
EΤ Tracking Error
V
A
mute
BASS CONTROL (1)
Gb Control Range Max. Boost/cut ±12.0 ±14.0 ±16.0 dB
B
STEP
R
TREBLE CONTROL (1)
Gt Control Range Max. Boost/cut ±13.0 ±14.0 ±15.0 dB
T
STEP
MIDDLE CONTROL (1)
Gm Control Range Max. Boost/cut ±12.0 ±14.0 ±16.0 dB
M
STEP
R
Supply Voltage 6 9 10.2 V
S
I
Supply Current 4 7 10 mA
S
IN Input Resistance 70 100 130 KΩ
Clipping Level THD = 0.3% 2 2.5 Vrms
CL
Input Separation The selected input is grounded
IN
80 100 dB
through a 2.2µ capacitor
Maximum Input Gain 29 30 31 dB
step Step Resolution 1.5 2 2.5 dB
R
Input Resistance 20 33 50 KΩ
i
Control Range 45 47 49 dB
Max. Attenuation 45 47 49 dB
Step Resolution 0.5 1 1.5 dB
Attenuation Set Error AV = 0 to -24dB -1.0 0 1.0 dB
A
= -24 to -47dB
A
V
= 0 to -24dB
A
V
= -24 to -47dB
A
V
DC Step adjacent attenuation steps
DC
from 0dB to
A
max
V
-1.5 0 1.5 dB
01dB
02dB
0
3mV
0.5
Mute Attenuation 80 100 dB
Step Resolution 1 2 3 dB
Internal Feedback Resistance 33 44 55 KΩ
B
Step Resolution 1 2 3 dB
Step Resolution 1 2 3 dB
Internal Feedback Resistance 18.75 25 31.25 KΩ
M
mV
3/19
TDA7439
Table 5. Electrical Characteristcs (continued)
SPEAKER ATTENUATORS
C
RANGE
S
STEP Step Resolution 0.5 1 1.5 dB
E
V
A
mute
AUDIO OUTPUTS
V
CLIP
R
R
V
GENERAL
E
S/N Signal to Noise Ratio All gains 0dB; V
S
BUS INPUT
V
V
I
V
Notes: 1. The device is functi onally good at V s = 5V . a st ep down, on Vs, to 4V does’t re set the device.
Control Range 70 76 82 dB
Attenuation Set Error
A
DC Step adjacent attenuation steps 0 3 mV
DC
A
= 0 to -20dB
V
= -20 to -56dB
A
V
-1.5 0 1.5 dB
-2 0 2 dB
Mute Attenuation 80 100 dB
Clipping Level d = 0.3% 2.1 2.6 VRMS
Output Load Resistance 2 KΩ
L
O Output Impedance 10 40 70 Ω
DC Voltage Level 3.5 3.8 4.1 V
DC
Output Noise All gains = 0dB;
NO
515µV
BW = 20Hz to 20KHz flat
Total Tracking Error AV = 0 to -24dB 0 1 dB
E
t
= -24 to -47dB
A
V
= 1V
O
Channel Separation Left/Right 80 100 dB
C
d Distortion A
Input Low Voltage 1V
IL
Input High Voltage 3 V
IH
Input Current VIN = 0.4V -5 0 5 µA
IN
Output Voltage SDA Acknowledge IO = 1.6mA 0.4 0.8 V
O
2. BASS, MIDDLE and TREBLE response: The center frequency and the response quality can be chosen by the external circuitry.
= 0; VI = 1V
V
RMS
; 95 106 dB
RMS
; 0.01 0.08 %
02dB
4/19
Figure 4. TES T C IR C U IT
D95AU313
TDA7439
0.47µF
0.47µF
0.47µF
0.47µF
0.47µF
0.47µF
0.47µF
0.47µF
L-IN1
L-IN2
L-IN3
L-IN4
R-IN1
R-IN2
R-IN3
R-IN4
5.6nF
2.2µF
TREBLE(L)
15 16 27 26 25 23 24
VOLUME
VOLUME
17 18 28 19 20 21 22 2
INR TREBLE(R)
2.2µF
5.6nF
+ GAIN
0/30dB
2dB STEP
MUXOUTL INL
G
G
MUXOUTR
11
100K
12
100K
13
100K
14
100K
10
100K
9
100K
8
100K
7
100K
INPUT MULTIPLEXER
2.7K 5.6K
18nF 22nF 100nF 100nF
MIN(L)
MOUT(L)
R
M
TREBLE
TREBLE
MIDDLE
I2CBUS DECODER + LATCHES
MIDDLE
R
M
MOUT(R) BOUT(R)BIN(R)
MIN(R)
18nF 22nF 100nF 100nF
2.7K 5.6K
BIN(L)
BASS
BASS
BOUT(L)
R
B
SPKR ATT
LEFT
SPKR ATT
RIGHT
V
REF
SUPPLY
R
B
CREF
10µF
LOUT
6
30
SCL
1
SDA
29
DIGGND
5
ROUT
3
V
S
4
AGND
D95AU339B
3 AP PL ICATION SUGGEST IONS
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 st ep resolution . The very high reso lution allows the implementati on of systems free
from any noisy acoustical effect. The TDA7439 audioprocessor provides 3 bands tone s control.
3.1 Bass, Middle Stages
The Bass and the middle cells have the same structure. The Bass cell has an internal resistor Ri = 44KΩ
typical.
The Middle cell has an internal resistor Ri = 25KΩ typica l.
Several filter types can be implemented, connecting external components to the Bass/Middle IN and OUT
pins.
Figure 5.
Ri internal
OUTIN
C
1
C
2
R
2
5/19
TDA7439
F
1
2
---
R2C2 R2C1 RiC1
---
Q
2
-- -
C
2
-- -
R
---
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:
--------------------------------------------------------------
=
C
2 π R1 R2 C 1 C
---------------------------------------------------------
A
=
V
-----------------------------------------------
=
Viceversa, once Fc, Av, and Ri internal value are fixed, the external components values will be:
1–
A
V
------------------------------------------ C2
1
2 π Fc Ri Q⋅⋅ ⋅ ⋅
⋅⋅⋅⋅⋅
++
R2C1 R2C2+
R1 R2 C1 C
⋅⋅⋅
R2C1 R2C2+
Q
==
---------------------------
A
V
C1⋅
1– Q2–
1– Q2–
A
-------------------------------------------------------------------
2
=
2 π C1 Fc A
V
1–()Q⋅⋅⋅⋅ ⋅
V
3.2 Treble Stage
The treble stage is a high pass filter whose time constant is fixed by an internal resistor (25KΩ typical) and
an external capacitor connected between treble pins and ground Typical responses are reported in Figg.
10 to 13.
3.3 CREF
The suggested 10µF reference capacitor (CREF) value can be reduced to 4.7µF if the application requires
faster power ON.
Figure 6. THD vs . fre qu e ncy Figure 7. THD vs . RLOA D
6/19
Loading...