SGS Thomson Microelectronics TDA7464 Datasheet
DIGITALLYCONTROLLEDAUDIO PROCESSOR WITH
SRS SURROUND SOUND AND VOICE CANCELLER
The Device incorporates the SRS
(Sound Retrieval System) under
licence fromSRS Labs, Inc.
4 STEREOINPUTS
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:
- MUSIC IN 4 DIFFERENTSELECTABLE
RESPONSES
- MOVIE AND SIMULATEDIN256
DIFFERENTSELECTABLE RESPONSES
2 SPEAKERSOUTPUTS
- INDEPENDENTATTENUATORS IN1dB
STEPFOR BALANCEFACILITY
- ZEROCROSSINGATTENUATIO NAVAILABLE
- INDEPENDENTMUTE FUNCTION
2 RECORD OUTPUTS
- INDEPENDENTATTENUATORS IN1dB
STEPFOR BALANCEFACILITY
- MUXAVAILABLE FORPROCESSESSIGNAL
SELECTIO N
- INDEPENDENTMUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SERIAL BUS
DESCRIPTION
The TDA7464 is a volumetone (bass middle 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
TDA7464
TQFP44
ORDERING NUMBER: TDA7464
PIN CONNECTION
LP
PS1
PS2
PS3
VSPS4
CREF
R_IN4
R_IN3
R_IN2
LPVC
44 43 42 41 3940 38 37 36 35 34
1
LP1
2
HP1
3
HP2
4
NETW1
5
NETW2
6
VAR_L
VAR_R
7
8
9
10
12 13 14 15 16
BASS_RI
BASS_RO
MIDDLE_LI
MIDDLE_LO
MIDDLE_RO
171118 19 20 21 22
SDA
AGND
TREBLE_L
TREBLE_R
MIDDLE_RI
BASSO_L
BASSO_R
BASS_LO
BASS_LI
specification. Control of all the functions is accomplishedby serial bus.
Thanks to the used BIPOLAR/CMOSTechnology,
Low Distortion, Low Noise and DC stepping are
obtained.
SCL
33
32
31
30
29
28
27
26
25
24
23
D96AU483C
R_IN1
VREFOUT
L_IN1
L_IN2
L_IN3
L_IN4
RECOUT_L
RECOUT_R
L_OUT
R_OUT
DIG_GND
February 1998
1/21
TDA7464
BLOCK DIAGRAM
SCL
SDA
L-OUT
RECOUT-L
25
27
ATT
SPKR
MUTE
N.B. SW
30K
2.2µF
BASSO-L VAR-L
79dB CONTROL
REC
79dB CONTROL
-
+
FIX
VAR
ATT
MUTE
DIG_GND
222123
SPKR
79dB CONTROL
FIX
R-OUT
RECOUT-R
24
26
ATT
MUTE
-
+
VAR
ATT
REC
MUTE
D96AU481D
N.B. SW
30K
89121834
2.2µF
BASSO-R VAR-R
79dB CONTROL
AMP
MIXING
EFFECT
CONTROL
LPF
9KHz
+
TREBLE MIDDLE BASS
3BAND
FIX
REAR
FIX
SRS
SURR
MIX SW
+
ON
VOICE
+LPF
-
BASS-RO
SURR
STEREO
REF
V
SUPPLY
31.5dB
control
BASS-RI
RM RB
17 16 13
130K
CENTER SPACE
NETW1NETW2
SRS
54
1K
0.47µF
LP
1.2nF
100K
VREFOUT
32
22µF
CREF
AGND
S
V
39 20 38 44
LPVC TREBLE-R
100nF
5.6K
100nF 100nF
MIDDLE-RO
2.7K
18nF 22nF
MIDDLE-RI
5.6nF
47.5K
1.5K 32.4K
4.42K
4.7nF
3.74K
0.47µF
SURR
MOVIE/
MUSIC
R5
3BAND
C BUS DECODER + LATCHES
2
I
REAR
BASS
MIDDLE
TREBLE
SURR
SRS
AMP
MIXING
SIM
OFF
MUSIC
SIM
MOVIE/
L-R
-
-
+
+
R6
-
+
+
FIX
BASS-LO
100nF
10 7 6
RB
BASS-LI
5.6K
100nF
MIDDLE-LO
22nF
2.7K
18nF
5.6nF
22nF
22nF
4.7nF
100nF
5.6nF 680nF
MIDDLE-LI
15 14 11
19
TREBLE-L
PS4
PS3
PS2
PS1
123 43 42 41 40
LP1 HP1 HP2
31.5dB control
RM
FIX
PS4
RPS4
400Hz
PS3
RPS3
400Hz
PS2
4KHz
RPS2
PS1
90Hz
RPS1
MIX SW
+
RHP1
RLP1
2/21
50K
50K
50K
L-IN3
50K
28
33
L-IN4
0.22µF
0.22µF
31
30
29
L-IN1
0.22µF
L-IN2
0.22µF
0.22µF
R-IN1
50K
50K
36
35
R-IN2
0.22µF
0.22µF
R-IN3
50K
50K
37
R-IN4
0.22µF
TDA7464
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 DistortionV = 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, allcontrolsflat (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 /RCHout, 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
TDA7464
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 SelectionD0=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) ModeOFF, 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= -6dB
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
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
TDA7464
ELECTRICALCHARACTERISTICS (continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
R
MON1
R
MON2
R
MON3
R
LP1
R
HPI
R
LPF
STANDARDSURROUND SOUNDEFFECT CONTROL
C
RANGE
S
STEP
SURROUNDSOUNDMATRIX 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 Simulated Mode,EffectCtrl=-6dB
– 4.5 dB
Input signalof 250Hz,
1.4 V
Simulated R Output 2 Simulated Mode,EffectCtrl=-6dB
p-p,Rin
and Lin→R
out
3.8 dB
Input signalof 1kHz,
1.4 V
p-p,Rin
and L
Simulated R Output 3 Simulated Mode,EffectCtrl=-6dB
R
→
in
out
–20 dB
Input signalof 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 Shifter1: D1 = 0, D0 = 0 8.8 11.8 14.8 KΩ
Phase Shifter1: D1 = 0, D0 = 1 10.6 14.1 17.6 K
Phase Shifter1: D1 = 1, D0 = 0 13.4 17.9 22.4 KΩ
Phase Shifter1: D1 = 1, D0 = 1 28 37.3 46.6 KΩ
Phase Shifter2: D3 = 0, D2 = 0 4.2 5.6 7 K
Phase Shifter2: D3 = 0, D2 = 1 5.1 6.8 8.5 KΩ
Phase Shifter2: D3 = 1, D2 = 0 6.3 8.4 10.5 K
Phase Shifter2: D3 = 1, D2 = 1 13.7 18.3 22.9 KΩ
Phase Shifter3: D5 = 0, D4 = 0 9 12.1 15.1 K
Phase Shifter3: D5 = 0, D4 = 1 10.9 14.5 18.1 KΩ
Phase Shifter3: D5 = 1, D4 = 0 13.6 18.1 22.6 KΩ
Phase Shifter3: D5 = 1, D4 = 1 29.3 39.1 48.9 KΩ
Phase Shifter4: D7 = 0, D6 = 0 9 12.1 15.1 KΩ
Phase Shifter4: D7 = 0, D6 = 1 10.9 14.5 18.1 K
Phase Shifter4: D7 = 1, D6 = 0 13.6 18.1 22.6 KΩ
Phase Shifter4: 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 ControlRange -31 0 dB
Step
P
ERSP1
P
ERSP2
L+R L+ R SRS Curve SPACE= MUTE,CENTER=0dB
L, R L, R SRS Curve SPACE= MUTE,
Center Step Resolution 1 dB
C
Space Step Resolution 1 dB
S
Perspective 1 Input Signalof 125Hz
12 dB
SPACE= 0dB,CENTER= MUTE
R
= GND; Lin→ R
in
Perspective 2 Input Signalof 2.15KHz
OUT
0dB
SPACE= 0dB,CENTER= MUTE
R
= GND; Li
in
n →ROUT
-8.5 dB
in = GND; Lin → ROUT
R
-13.4 dB
CENTER= MUTE
R
= GND; Lin→ L
in
OUT
Lin = GND; Rin → ROUT
5/21
TDA7464
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 µVrms
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 Ω
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
Vrms
µ
µVrms
6/21
TDA7464
I2C BUSINTERFACE
Data transmission from microprocessor to the
TDA7464 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 theSDA 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 transferredon 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 resistiveHIGHlevel on 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 mastertransmitter 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 canuse a simplertransmission:
simply it waits one clock without checking the
slaveacknowledging,and sendsthe 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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