Datasheet TDA7434 Datasheet (SGS Thomson Microelectronics)

BASIC FUNCTION AUDIO PROCESSOR

TWOSTEREOAND ONE MONOINPUTS
MUTE FUNCTION (SOFTWARE AND HARD-

WARE) CONTROLLED
VOLUMECONTROL IN 1dB STEP
BASS AND TREBLE CONTROL
FOURSPEAKERATTENUATORS:

– Independentattenuationcontrol
– Independentmutefunction

ALL FUNCTIONS PROGRAMMABLE VIA

2

CBUS

I
FULLY PROGRAMMABLE LOUDNESS CON-

TROL

DESCRIPTION

The TDA7434 is a volume, tone (bass and treble)
balance (Left / Right) fader (Front / Rear) proces­sor for quality audio applications in car radio and
Hi-Fi systems.

Control is accomplished by serial bus microproc­essor interface.

TDA7434

SDIP24

ORDERING NUMBER:

The AC signal setting is obtained by resistor net­works and switches combined with operational
amplifiers.

Thanks to the advanced BIPOLAR/CMOS Tech­nology, the external components have been re­duced.

TDA7434

BLOCK DIAGRAM

IN1_L
IN2_L

MONO/MUTE

IN2_R
IN1_R

S

4.7K

100nF 100nF

LOUD_L

6
2

MUX

4

1
5

20

MUX

SUPPLYV

23

GND

24 10 9 14

BIN_L BOUT_L TRL

7

VOL BASS TREBLE

VOL BASS TREBLE

12 11 13

S BUS DECODER + LATCHES

8
LOUD_R

BIN_R BOUT_R TRRCREF

100nF 100nF

4.7K

2.7nF

2.7nF

SPKR

ATT

SPKR

ATT

SPKR

ATT

SPKR

ATT

19

17

21
22

18

16

D95AU360A

LEFT FRONT

LEFT REAR

SCL
SDA

RIGHT FRONT

RIGHT REAR

August 1996

This is advanced information on a new product now in development or undergoingevaluation. Details are subject to change without notice.

1/10

TDA7434

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

S

T

amb

T

stg

QUICK REFERENCE DATA

Symbol Parameter Min. Typ. Max. Unit

V

S

V

CL

THD Total Harmonic Distortion (V = 1Vrms f = 1kHZ) 0.05 %

S/N Signal to Noise Ratio 102 dB

Sc Channel Separation f = 1kHz 100 dB

Operating Supply Voltage 10.2 V
Operating Temperature Range -40 to 85 °C
Storage Temperature Range -55 to +150 °C

Supply Voltage 7 9 10.2 V
Max. Input SignalHandling 1.3 1.6 Vrms

Volume Control 1dB step -79 +32 dB
Bass Control 2dB step -18 +18 dB
Treble Control 2dB step -14 +14 dB
Speaker Attenuators -37.5 0 dB
Mute Attenuation 100 dB

PIN CONNECTION (Top View)

MONO/MUTE

LOUD_L
LOUD_R
BOUT_R

BOUT_L

IN2_L

N.C.

IN1_R

IN1_L

BIN_R

BIN_L

1
2
3
4
5
6
7
8
9
10
11
12

D95AU361

24
23
22
21
20
19
18
17
16
15
14
13

CREFIN2_R
GND
SDA
SCL
V

S

OUT_LF
OUT_RF
OUT_LR
OUT_RR
N.C.
TRR
TRL

THERMAL DATA

Symbol Parameter Value Unit

Thermal Resistance Junction-pins Max. 65 °C/W

2/10

R

th j-pins

APPLICATIONCIRCUIT

TDA7434

68nF

LOUD_L

7

100nF

100nF

100nF

100nF

100nF

9V

V

S

100nF

IN1_L

IN2_L

MONO/

MUTE

IN2_R

IN1_R

V

6

2

4

1

5

20

S

MUX

MUX

SUPPLY

23

GND

10µF 68nF

VOL BASS TREBLE

VOL BASS TREBLE

24 10 9 14

8
LOUD_R

4.7K

100nF 100nF

BIN_L BOUT_L TRL

12 11 13

S BUS DECODER + LATCHES

BIN_R BOUT_R TRRCREF

100nF 100nF

4.7K

2.7nF

2.7nF

SPKR

ATT

SPKR

ATT

SPKR

ATT

SPKR

ATT

19

17

21
22

18

16

D95AU362A

LEFT FRONT

LEFT REAR

SCL
SDA

RIGHT FRONT

RIGHT REAR

3/10

TDA7434

ELECTRICALCHARACTERISTICS

=25°C,VS=9V, RL= 10kΩ,Rg=50Ω,

(T

amb

all variable gains = 0dB, f = 1kHz, unless otherwise specified.)

Symbol Parameter Test Condition Min. Typ. Max. Unit

INPUT SELECTOR

R

IN

V

CL

S

IN

A

MUTE

V

DC

MUTE AT AM INPUT (*)

V

IL

VOLUME CONTROL

G

MAX

A

MAX

A

step

E

A

E

T

V

DC

LOUDNESS CONTROL

A

MAX

A

step

R

LOUD

BASS CONTROL

B

RANGE

B

CUT

A

Step

R

B

TREBLE CONTROL

C

RANGE

A

step

SPEAKER ATTENUATORS

C

RANGE

A

step

A

MUTE

E

A

V

DC

AUDIO OUTPUTS

V

CLIP

G

OUT

R

L

C

L

R

OUT

DC DC Voltage Level 3.7 4.0 4.3 V

V

(*) The mute function can be activated without using the I2C bus by grounding the AM input whenAM is not selected. This causes the input

multiplexer to selectthe reference voltage instead of an input signal.

Input Resistance 70 100 130 kΩ
Clipping Level d≤0.3% 1.3 1.6 Vrms
Input Separation 70 90 dB
Input Mute Attenuation 70 95 dB
Mute DC Step 0.2 10 mV

Input Low Voltage AM not selected 0.4 V

Max. Gain Note 2 30.5 32 33.5 dB
Max Attenuation 75 79 83 dB
Step Resolution 0.5 1 1.5 dB
Attenuation Set Error G = +20 to -20dB -1 0 +1 dB

G = -20 to -60dB -2 2 dB
Tracking Error G = +20to -60dB 2 dB
DC Steps Adjacent Attenuation Steps,

0.1 4 mV

Range from 0 to -79dB

From 0dB to -79dB 0.5 10 mV

Control Range 14 15 16 dB
Step Resolution 0.5 1 1.5 dB
Internal Resistor 37 50 63 k

Ω

Max. Bass boost 15.5 +18 20 dB
Max. Bass cut -20 -18 -15.5 dB
Step Resolution 1 2 3 dB
Internal Feedback Resistance 48 65 82 k

Ω

Control Range ±13 ±14 ±15 dB
Step Resolution 1 2 3 dB

Control Range 36 37.5 39 dB
Step Resolution From 0 to -24dB 0.5 1 1.5 dB
Output Mute Attenuation 70 90 dB
Attenuation Set Error From 0 to -24dB 1 dB
DC Steps Adjacent Attenuation Steps 0.1 4 mV

Clipping Level d = 0.3% 2 2.5 Vrms
Output Gain (fixed) 3.5 4 4.5 dB
Output Load Resistance AC - connected 3 k

Ω

DC connected to GND 5
Output Load Capacitance 10 nF
Output Impedance 30 100 Ω

4/10

TDA7434

ELECTRICALCHARACTERISTICS

(continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

GENERAL

V

S

I

S

Supply Voltage 6 9 10.2 V
Supply Current 5 8 11 mA

PSRR Power Supply Rejection Ratio 65 85 dB

e

NO

Output Noise 20Hz - 20kHz ”A”- weighted

BW = 200Hz - 20kHz, flat

output muted

S/N Signal to Noise Ratio all gains = 0dB; V

d Distortion V

= 1Vrms 0.04 0.15 %

OUT

= 1Vrms 103 dB

O

4

7.0

5.5

20

Sc Channel Separation 70 80 dB
E

T

Total Tracking Error AV= 0 to -20dB

A

= -20to -60dB

V

0
0

1
2

BUS INPUTS

V

IL

V

IH

I

IN

V

O

Input Low Voltage 1V
Input High Voltage 3 V
Input Current VIN= 0.4V -5 +5 µA
Output Voltage

IO= 1.6mA 0.15 0.40 V
SDA Acknowledge

SOFTWARESPECIFICATION
Interface Protocol

The interfaceprotocol comprises:
– astart condition(S)
– achip address byte (the LSBbit determinesread / write transmission)
– asubaddressbyte
– asequence of data (N-bytes+ acknowledge)
– astop condition (P)

µ
µV
µV

dB
dB

V

MSB

CHIP ADDRESS

LSB

MSB

SUBADDRESS

LSB MSB

DATA 1...DATAn

LSB

S 1 0 0 0 1 0 1 R/W ACK X X X I A3A2A1A0ACK DATA ACK P

ACK = Acknowledge
S = Start
P = Stop
MAX CLOCK SPEED 500kbits/s

Auto Increment

If bit I in the subaddressbyte is set to ”1”, the autoincrementof the subaddressis enabled.

5/10

TDA7434

SUBADDRESS

(receivemode)

MSB LSB

X X X I A3A2A1A0

0
0
0
0
0
0
0
0

0
0
0
0
1
1
1
1

0
0
1
1
0
0
1
1

I = Auto increment
X = Not used

DATA BYTE SPECIFICATION

X = not relevant; set to ”1” during testing

Input Selector

MSB LSB

D

D

7

D

6

D

5

D

4

D

3

D

2

0
0
0
0
1

1

0
0
1
1

X
0
1

0
1

Input selector

0

Volume

1

Bass, Treble

0

Speaker attenuator LF

1

Speaker attenuator LR

0

Speaker attenuator RF

1

Speaker attenuator RR

0

Loudness

1

D

0

IN 2

0

IN 1

1

mono

0

no input selected

1

mute (low homic)

X

non-symmetrical bass cut (note 1)
symmetrical bass cut
extended bass range
standard bass range ±14dB

FUNCTION

FUNCTION

For example to selectthe MONO input the Data Byte is: X X X X X 0 1 0.
An additionaldirectmute function is included in the Speaker Attenuators.

Note 1: Basscut for very low frequencies.

MSB LSB

(*) D

D

7

1
1
1
1
1
1
1

1
1
1

D

6

0
0
0
0
1
1
1

D

5

0
0
1
1
0
0
1

D

4

D

3

D

2

D

1

0
1
0
1
0
1
0

0
0
0

0
0
0

0

0

1

0
1

0
1
1

1

1

1

1

0

+32dB
+16dB

0dB

-16dB

-32dB

-48dB

-64dB
0dB

-1dB

-2dB

-15dB

VOLUME

(*) Loudness = ON

Note 2:
It is not recommended to use a gain more than 20dB for system performance reason. In general, the max. gain should be limited by
software to the maximum value, which is needed for the system.

6/10

Bass, Treble

TDA7434

D4

Input

Selector

0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0

MSB LSB

D

D

D

D

D

D

D

7

6

5

4

3

2

0

0

0

0

0

0

0

0

1

0

1

0

1

0

1

0

1

1

1

1

1

1

1

1

0

1

0

1

0

1

0

1

1

0

0

0

0

0

0

0

0

0

0

0

0

0

1

0

1

0

1

0

1

0

1

1

1

1

1

1

1

1

0

1

0

1

0

1

0

1

0

1

0

1

0

0

0

0

1

0

0

1

1

1

0

0

1

0

0

1

1

1

1

1

0

1

1

0

0

0

1

1

0

1

1

0

0

0

0

0

1

0

D

1

0

0

1

0

0

1

1

1

0

0

1

0

0

1

1

1

1

1

0

1

1

0

0

0

1

1

0

1

1

0

0

0

0

Treble Steps

- 14dB

-12dB

-10dB

-8dB

-6dB

-4dB

-2dB
0dB
0dB
+2dB
+4dB
+6dB
+8dB
+10dB
+12dB
+14dB

Bass Steps

-18dB

-16dB

-14dB

-12dB

-10dB

-8dB

-6dB

-4dB

-2dB
0dB
0dB
+2dB
+4dB
+6dB
+8dB
+10dB
+12dB
+14dB
+16dB
+18dB

normal

range

14dB

±

FUNCTION

For example 12dB Treble and -8dB Bass give the followingDATA BYTE: 0 0 1 1 1 0 0 1

Speaker Attenuators

MSB LSB

D

D

7

X
X

D

6

X
X

D

5

0
0

D

4

0
0

D

3

0
0

D

2

0
0

D

1

0
0

0

1

:
X
X
X
X
X
X
X
X

X

X
X
X
X
X
X
X
X

X

0
0
0
0
0
0
0
0

1

1
1
1
1
1
1
1
1

X

1
1
1
1
1
1
1
1

X

0
0
0
0
1
1
1
1

X

0
0
1
1
0
1
1
1

X

0
1
0
1
0
1
0
1

X

0

SPEAKER ATTENUATOR LF, LR, RF, RR

0dB

-1dB
:

-24dB

-25.5dB

-27dB

-28.5dB

-30dB

-32dB

-34.5dB

-37.5dB

Speaker Mute

7/10

TDA7434

Loudness

MSB LSB

D

D

7

X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X

D

6

X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X

D

5

X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X

D

4

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

D

1

D

3

0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1

D

3

D

2

0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1

D1

2

D

1

0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1

0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1

D0

0

0dB

-1dB

-2dB :

-3dB

-4dB

-5dB

-6dB

-7dB

-8dB

-9dB

-10dB

-11dB

-12dB

-13dB

-14dB

-15dB

Loudness flat (Note 3)

LOUDNESS

For example to select-14dBLoudness the Data Byte is : XX X 01110.

Note 3:
FIat attenuation, according to the selected byte. The loudness can be completely disabled by setting bit D7 in the volume byte to”0”. Inthis
case the attenuation is 0dB independentfrom the loudness settings.

Functional Description

The input selectoris able to select 2 stereoinputs
and 1 mono input (AM). The inputs are DC biased
with a 100kΩ resistors to the internal reference
voltage of 3V. The AM input can be used addi­tionally as hardware mute pin. If this pin is pulled
to ground by an external transistorsand AM is not
selected, the input selector mutes the input (refer­ence voltage selected). The AM part is consid­ered to be switched OFF. If the output of the AM
part is not high ohmic in this condition, a series
resistor of about 20kΩhasto beforeseen.

The volume control can be programmed from a
gain of +32dB to an attenuation of -79dB in 1dB
steps. The maximum gain should be kept as low
as possible for system performancereason. It has
to be limited by software to the absolute neces­sary system gain, dependingon the signalsource
level and the power amplifier gain.

The bass control acts in a range from +18dB to ­18dB in 2dB steps. The filter response is deter-

8/10

mined by the external filter components. An ex­tensive simulation software is available in order to
supportthe design of the bass filter response with
differentfilter configurations.
The extended bass boost range of +18dB allows
the implementation of thesoftware loudnessfunc­tion by additional bass and treble boost.

The treblecontrol acts in a range of ±14dB in 2dB
steps. The external capacitor determines with the
internal resistor of 50KΩ the corner frequency of
the treble response.

The four speaker attenuatorscan be controlled in­dependentlyfrom 0 to -37.5dB, which allows the
implementation of balance and fader for a four
speaker system. The attenuation steps size is 1
db from 0 to -24dB and increases nonlinearly up
to the maximum attenuation of 37.5dB. A special
mute bit forces the speaker attenuator into the
muteposition.

All 4 outputs are low distortion push pull outputs,
able to drive a loadof 3kΩ.

SDIP24 PACKAGE MECHANICAL DATA

TDA7434

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 5.08 0.20
A1 0.51 0.020
A2 3.05 3.30 4.57 0.120 0.130 0.180

B 0.36 0.46 0.56 0.0142 0.0181 0.0220
B1 0.76 1.02 1.14 0.030 0.040 0.045

c 0.23 0.25 0.38 0.0090 0.00980.0150

D 22.61 22.86 23.11 0.890 0.90 0.910

E 7.62 8.64 0.30 0.340
E1 6.10 6.40 6.86 0.240 0.252 0.270

e 1.778 0.070

e1 7.62 0.30
e2 10.92 0.430
e3 1.52 0.060

L 2.54 3.30 3.81 0.10 0.130 0.150

BeB1

D

24

1

13

12

A2

A1

LA

Stand-off

F

SDIP24

E

E1

e1
e2

c

E

.015
0,38

Gage Plane

e3
e2

9/10

TDA7434

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications men­tioned in this publication are subject to change without notice. This publication supersedes and replaces all informationpreviously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without ex­press written approval of SGS-THOMSON Microelectronics.

 1995 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved

SGS-THOMSON Microelectronics GROUP OF COMPANIES

Australia- Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -

Singapore - Spain - Sweden - Switzerland - Taiwan - United Kingdom - U.S.A.

10/10