SGS Thomson Microelectronics TDA7466 Datasheet
DIGITALLYCONTROLLEDAUDIO PROCESSOR WITH
SRS SURROUND SOUND AND VOICE CANCELLER
The Device incorporates the SRS
(Sound Retrieval System) under
licencefromSRS Labs, Inc.
1 STEREOINPUT
INPUT ATTENUATION CONTROL IN 0.5dB
STEP
TREBLEMIDDLE ANDBASS CONTROL
VOICECANCELLERIS AVAILABLE
STEREO SRS SURROUND SOUND WITH
CENTER& SPACECONTROL IS AVAILABLE
THREE STANDARD SURROUND MODES
ARE AVAILABLE:
- MUSICIN 4 DIFFERENTSELECTABLE
RESPONSES
- MOVIE ANDSIMULATED IN256
DIFFERENTSELECTABLE RESPONSES
2 SPEAKERSOUTPUTS
- INDEPENDENTATTENUATORS IN1dB
STEPFOR BALANCEFACILITY
- ZEROCROSSINGATTENUAT IONAVAILABLE
- AVAILABILITYOF LOUDSPEAKERS
EQUALIZATION FIXEDBY EXTERNAL
COMPONENTS
- INDEPENDENTMUTE FUNCTION
2 RECORD OUTPUTS
- INDEPENDENTATTENUATORS IN1dB
STEPFOR BALANCEFACILITY
- MUXAVAILABLE FORPROCESSESSIGNAL
SELECTIO N
- INDEPENDENTMUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SERIAL BUS
DESCRIPTION
The TDA7466 is a volume tone (bassmiddle and
treble) balance (Left/Right) processorswith stereo
SRS and voicecanceller for quality audio applications in car radio, Hi-Fi, TV systems.
It reproduces SRS (Sound Retrieval System)
sound by external components and surround
sound by using phase shifters and a signal matrix. The AC signal setting is obtained by resistor
networks and switches combined with operational
amplifiers according to the SRS laboratories
specification. Control of all the functions is ac-
TDA7466
SDIP42
ORDERING NUMBER: TDA7466
PIN CONNECTION
1
V
S
LP
LP1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
D96AU445A
PS4
PS3
PS2
PS1 R_IN
HP1
HP2
VAR_L
BASSO_L
VAR_R
BASSO_R
BASS_LO
BASS_LI
BASS_RO
BASS_RI
MIDDLE_LO
MIDDLE_LI
MIDDLE_RO
MIDDLE_RI
complishedby serialbus.
Thanks to the used BIPOLAR/CMOSTechnology,
Low Distortion, Low Noise and DC stepping are
obtained.
42
41
40
39
38
37
36
35
34
33
32
31
30
29
27
26
25
24
23
22
CREF
NBRO
NBRIN
LPVC
VREFOUT
L_IN
NBLIN
NBLO
NETW2
NETW1
RECOUT_L
RECOUT_R
L_OUT
R_OUT28
DIG_GND
SCL
SDA
AGND
TREBLE_L
TREBLE_R
May 1997
1/21
TDA7466
BLOCK DIAGRAM
SCL
SDA
DIG_GND
262527
79dB CONTROL
ATT
REC
79dB CONTROL
SPKR
-
VAR
L-OUT
29
ATT
MUTE
+
FIX
MUTE
RECOUT-L
31
NB1
3435
NB2
NBLIN NBLO
NB-LA NB-LB
2.2µF
30K
BASSO-L VAR-L
ATT
SPKR
79dB CONTROL
+
FIX
28
R-OUT
-
VAR
MUTE
REC
RECOUT-R
30
ATT
MUTE
D96AU446B
NB4
NB3
NBRIN NBRO
30K
1213162239
BASSO-R VAR-R
79dB CONTROL
NB-RA NB-RB
2.2µF
5.6K
2.7K
100nF
100nF
22nF
18nF
5.6nF
22nF
22nF
4.7nF
100nF
5.6nF 680nF
BASS-LO
14 11 10
BASS-LI
MIDDLE-LO
MIDDLE-LI
19 18 15
23
TREBLE-L
PS4
PS3
PS2
PS1
789 5 4 3 2
LP1 HP1 HP2
31.5dB control
SRS
SIM
MOVIE/
R6
REAR
SURR
OFF
-
3BAND
C BUS DECODER + LATCHES
2
I
BASS
MIDDLE
TREBLE
AMP
MIXING
MUSIC
SIM
MOVIE/
-
L-R
-
+
+
+
+
FIX
RB
RM
RPS4
RPS3
RPS2
RPS1
MIX SW
36
L-IN
0.22µF
SURR
FIX
PS4
400Hz
PS3
400Hz
MUSIC
PS2
4KHz
PS1
90Hz
+
R5
RHP1
RLP1
50K
AMP
MIXING
EFFECT
CONTROL
LPF
9KHz
+
TREBLE MIDDLE BASS
FIX
-
SURR
3BAND
FIX
SRS
VOICE
BASS-RO
SURR
REAR
RM RB
21 20 17
CENTER SPACE
SRS
32 33
STEREO
100K
+
REF
V
37 40 41
ON
SUPPLY
+LPF
12442 6
31.5dB
control
50K
38
R-IN
100K
0.22µF
NETW2NETW1
1K
LP
CREF
AGND
S
V
LPVC TREBLE-R
BASS-RI
100nF 100nF
MIDDLE-RO
18nF 22nF
MIDDLE-RI
130K
0.47µF
1.2nF
VREFOUT
22µF
100nF
5.6nF
5.6K
2.7K
4.7nF
3.74K
47.5K
0.47µF
1.5K 32.4K
4.42K
2/21
TDA7466
THERMAL DATA
Symbol Description Value Unit
R
thj-pins
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
T
amb
T
QUICK REFERENCE DATA
Symbol Parameter Min. Typ. Max. Unit
V
V
THD Total Harmonic Distortion V = 1Vrms f= 1KHz 0.01 0.1 %
S/N Signal to Noise Ratio V
S
Thermal Resistance Junction-pins Max. 85 °C/W
Operating Supply Voltage 11 V
S
Operating Ambient Temperature -10 to 85
Storage Temperature Range -55 to +150 °C
stg
Supply Voltage 7 9 10.2 V
S
CL
Max. input signal handling 2 Vrms
out = 1Vrms (mode = OFF) 106 dB
Channel Separation f = 1KHz 90 dB
C
Input Attenuation Control (0.5dB) -31.5 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 (L
CH, RCH) -79 0 dB
Mute Attenuation 100 dB
C
°
ELECTRICALCHARACTERISTICS (refer to the test circuit T
= 1Vrms;RG= 600Ω, allcontrols flat (G = 0dB),Effect Ctrl = -6dB, MODE= OFF; f = 1KHz
V
in
=25°C, VS= 9V,RL= 10KΩ,
amb
unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
SUPPLY
V
S
I
S
SVR Ripple Rejection L
Supply Voltage 7 9 10.2 V
Supply Current 25 mA
CH /RCH out, Mode = OFF 60 80 dB
INPUTSTAGE
R
IN
V
CL
A
RANGE
A
VMIN
A
VMAX
A
STEP
V
DC
A
VO1
A
VO2
Input Resistance 37.5 50 62.5 KΩ
Clipping Level THD = 0.3% 2 2.5 Vrms
Attenuation Range 31.5 dB
Min. Attenuation -1 0 1 dB
Max. Attenuation 31 31.5 32 dB
Step Resolution -1 0.5 1 dB
DC Steps Adjacent att. step -3 0 3 mV
Voice Canceller Output 1 LIN=RIN,RIN=ON,
V
= 0V FIX, 0dB attenuation
mix
Voice Canceller Output 2 LIN=RIN=0VV
mix
=1V
rms
FIX,
567dB
-1 0 1 dB
0dB attenuation
3/21
TDA7466
ELECTRICALCHARACTERISTICS (continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
SUPPLY
A
VO3
Voice Canceller Output 3 LIN=-RIN,V
= 0V FIX,
mix
567dB
0dB attenuation
R
LPV
Low Pass Filter Resistance 24 32 40 KΩ
BASSCONTROL
Gb Control Range Max. Boost/cut +12.0 +14.0 +16.0 dB
B
STEP
R
B
Step Resolution 1 2 3 dB
Internal Feedback Resistance 33 44 55 KΩ
MIDDLE CONTROL
Gm Control Range Max. Boost/cut +12.0 +14.0 +16.0 dB
M
STEP
R
M
Step Resolution 1 2 3 dB
Internal Feedback Resistance 18.75 25 31.25 K
TREBLECONTROL
Gt Control Range Max. Boost/cut +13.0 +14.0 +15.0 dB
T
STEP
Step Resolution 1 2 3 dB
STANDARDSURROUND SOUND MATRIX
TEST CONDITION (PhaseResistor Selection D0=0, D1=1, D2=0. D3=1, D4=0,D5=1, D6=0,D7=1
Symbol Parameter Test Condition Min. Typ. Max. Unit
G
D
OFF
GOFF
In-phase Gain (OFF) Mode OFF, Input signal of
LR In-phase Gain Difference
(OFF)
G
MOV
D
GMOV
In-phase Gain (Movie) Movie mode, Effect Ctrl = -6dB
LR In-phase Gain Difference
(Movie)
G
MUS
D
GMUS
In-phase Gain (Music) Music mode, Effect Ctrl = -6dB
LR In-phase Gain Difference
(Music)
L
MON1
L
MON2
L
MON3
Simulated L Output 1 SimulatedMode,EffectCtrl= -6dB
Simulated L Output 2 SimulatedMode,EffectCtrl= -6dB
Simulated L Output 3 SimulatedMode, EffectCtrl= -
1kHz, 1.4 V
Lin→ L
out
p-p,Rin
→
R
out
Mode OFF, Input signal of
1kHz, 1.4 V
R
→
in
Input signal of 1kHz, 1.4 V
R
→
in
R
out,Lin
R
out,Lin
p-p
→
→
L
out
L
p-p
out
Movie mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
(Rin→ R
)–(Lin→ L
out
Input signal of 1kHz, 1.4 V
(Rin→ R
), (Lin→ L
out
out
out
p-p
)
p-p
)
Music mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
(Rin→ R
)-(Lin→ L
out
out
p-p
)
Input signal of 250Hz,
1.4 V
p-p,Rin
and L
L
→
in
out
Input signal of 1kHz,
1.4 V
p-p,Rin
and Lin→ L
out
6dB
Input signal of 3.6kHz,
1.4 V
p-p,Rin
and Lin→ L
out
-1 0 1 dB
-1 0 1 dB
8dB
0dB
7dB
0dB
4.5 dB
– 4.0 dB
7.0 dB
Ω
4/21
TDA7466
ELECTRICALCHARACTERISTICS (continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
R
MON1
R
MON2
R
MON3
R
LP1
R
HPI
R
LPF
STANDARDSURROUND SOUND EFFECT CONTROL
C
RANGE
S
STEP
SURROUND SOUNDMATRIX PHASE
R
PS10
R
PS11
R
PS12
R
PS13
R
PS20
R
PS21
R
PS22
R
PS23
R
PS30
R
PS31
R
PS32
R
PS33
R
PS40
R
PS41
R
PS42
R
PS43
Simulated R Output 1 SimulatedMode,EffectCtrl= -6dB
– 4.5 dB
Input signal of 250Hz,
1.4 V
Simulated R Output 2 SimulatedMode,EffectCtrl= -6dB
p-p,Rin
and Lin→R
out
3.8 dB
Input signal of 1kHz,
1.4 V
p-p,Rin
and L
Simulated R Output 3 SimulatedMode,EffectCtrl= -6dB
R
→
in
out
–20 dB
Input signal of 3.6kHz,
1.4 V
p-p,Rin
and L
R
→
in
out
Low Pass Filter Resistance 7.5 10 12.5 KΩ
High Pass Filter Resistance 45 60 75 K
LP Pin Impedance 7.5 10 12.5 KΩ
Control Range - 21 - 6 dB
Step Resolution 1 dB
Phase Shifter 1:D1 = 0, D0 = 0 8.8 11.8 14.8 KΩ
Phase Shifter 1:D1 = 0, D0 = 1 10.6 14.1 17.6 K
Phase Shifter 1:D1 = 1, D0 = 0 13.4 17.9 22.4 KΩ
Phase Shifter 1:D1 = 1, D0 = 1 28 37.3 46.6 KΩ
Phase Shifter 2:D3 = 0, D2 = 0 4.2 5.6 7 K
Phase Shifter 2:D3 = 0, D2 = 1 5.1 6.8 8.5 KΩ
Phase Shifter 2:D3 = 1, D2 = 0 6.3 8.4 10.5 K
Phase Shifter 2:D3 = 1, D2 = 1 13.7 18.3 22.9 KΩ
Phase Shifter 3:D5 = 0, D4 = 0 9 12.1 15.1 K
Phase Shifter 3:D5 = 0, D4 = 1 10.9 14.5 18.1 KΩ
Phase Shifter 3:D5 = 1, D4 = 0 13.6 18.1 22.6 KΩ
Phase Shifter 3:D5 = 1, D4 = 1 29.3 39.1 48.9 KΩ
Phase Shifter 4:D7 = 0, D6 = 0 9 12.1 15.1 KΩ
Phase Shifter 4:D7 = 0, D6 = 1 10.9 14.5 18.1 K
Phase Shifter 4:D7 = 1, D6 = 0 13.6 18.1 22.6 KΩ
Phase Shifter 4:D7 = 1, D6 = 1 29.3 39.1 48.9 K
Ω
Ω
Ω
Ω
Ω
Ω
Ω
SRS SURROUND SOUND MATRIX
CENTER SRS Control Range -31 0 dB
Step
SPACE SRS Space Control Range -31 0 dB
Step
P
ERSP1
P
ERSP2
L+R L+ R SRS Curve SPACE= MUTE,CENTER
Center Step Resolution 1 dB
C
Space Step Resolution 1 dB
S
Perspective 1 Input Signal of 125Hz
12 dB
SPACE= 0dB,CENTER= MUTE
R
in = GND; Lin → ROUT
Perspective 2 Input Signal of 2.15KHz
0dB
SPACE= 0dB,CENTER= MUTE
R
= GND; Lin→ R
in
OUT
-8.5 dB
=0dB
R
= GND; Li
in
n →ROUT
5/21
TDA7466
ELECTRICALCHARACTERISTICS (continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
SPEAKER & RECORDATTENUATORS
C
range
S
STEP
E
A
V
DC
A
MUTE
R
VAR
SPEAKER ATTENUATORS
V
TH
AUDIOOUTPUTS
N
O(OFF)
N
O(MOV)
N
O(MUS)
N
O(SIM)
N
O(SRS)
d Distorsion Av = 0 ; V
S
C
V
OCL
R
OUT
V
OUT
BUS INPUTS
V
IL
V
IH
I
IN
V
O
Control Range 79 dB
Step Resolution 0.5 1 1.5 dB
Attenuation set error Av = 0 to -20dB -1.5 0 1.5 dB
Av = -20 to -79dB -3 0 2 dB
DC Steps Adjacent att. steps -3 0 3 mV
Output Mute Condition 70 100 dB
Input Impedance 22.5 30 37.5 KΩ
Zero CrossingThreshold D7 = 0
Output Noise (OFF) Output Mute, Flat
B
= 20Hz to 20KHz
W
Output Noise (Movie) Standard
Surround Sound
Output Noise (Music) Standard
Surround Sound
Output Noise (Simulated)
Standard Surround Sound
Output Noise (SRS)
Mode =Movie ,
B
= 20Hz to 20KHz
W
Mode = Music ,
B
= 20Hz to 20KHz,
W
Mode = Simulated,
B
= 20Hz to 20KHz
W
BW= 20Hz to 20KHz 50
V
S
+
20
2
4
5
30 µVrms
30
30 µVrms
Surround Sound
= 1Vrms 0.01 0.1 %
in
Channel Separation 70 90 dB
Clipping Level d = 0.3% 2 2.5 Vrms
Output Resistance 10 30 50
DC Voltage Level 3.8 V
Input Low Voltage 1V
Input High Voltage 3 V
Input Current -5 +5 µA
Output Voltage SDA
IO= 1.6mA 0.4 V
Acknowledge
mV
Vrms
µ
µVrms
Vrms
µ
Vrms
µ
Ω
6/21
TDA7466
I2C BUSINTERFACE
Data transmission from microprocessor to the
TDA7466 and viceversa takes place through the
2 wires I
2
C BUS interface, consisting of the two
lines SDA and SCL (pull-up resistors to positive
supply voltage mustbe connected).
Data Validity
As shown in fig. 3, the data on the SDA line must
be stable during the high period of theclock. The
HIGH and LOW state of the data line can only
change when the clock signal on the SCL line is
LOW.
Start andStop Conditions
As shown in fig.4 a start condition is a HIGH to
LOW transition of the SDA line while SCL is
HIGH. The stop condition is a LOWto HIGH transition of the SDA linewhile SCL is HIGH.
Byte Format
Every byte transferred on the SDA line must con-
tain 8 bits. Each byte must be followed by an ac-
2
Figure 3: Data Validity on theI
CBUS
knowledgebit. The MSB is transferredfirst.
Acknowledge
The master (µP) puts a resistiveHIGHlevelon the
SDA line during the acknowledge clock pulse(see
fig. 5). The peripheral (audioprocessor) that acknowledges has to pull-down (LOW) the SDA line
duringthisclock pulse.
The audioprocessor which has been addressed
has to generate an acknowledge after the reception of each byte, otherwise the SDA line remains
at the HIGH level during the ninth clock pulse
time. In this case the master transmitter can generate the STOP information in order to abort the
transfer.
Transmission without Acknowledge
Avoiding to detect the acknowledge of the audio-
processor,the µP can use a simpler transmission:
simply it waits one clock without checking the
slaveacknowledging,and sends the new data.
This approach of course is less protected from
misworking.
Figure 4: TimingDiagram of I
2
Figure 5: Acknowledgeon the I
CBUS
2
CBUS
7/21
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