SGS Thomson Microelectronics TDA7314 Datasheet



DIGITAL CONTROLLED AUDIO PROCESSOR

1 STEREOINPUT
SELECTABLE INPUT GAIN FOR OPTIMAL

ADAPTIONTO DIFFERENTSOURCES
INPUT AND OUTPUT FOR EXTERNAL

EQUALIZER OR NOISE REDUCTION SYS­TEM

LOUDNESSFUNCTION
VOLUMECONTROLIN 1.25dB STEPS
TREBLEAND BASSCONTROL
FOURSPEAKER ATTENUATORS:

- 4 INDEPENDENTSPEAKERSCONTROL
IN 1.25dB STEPS FOR BALANCEAND

FADERFACILITIES

- INDEPENDENTMUTE FUNCTION

ALL FUNCTIONS PROGRAMMABLE VIA SE­RIAL BUS

DESCRIPTION

The TDA 7314 is a volume, tone (bass and treble)
balance (Left/Right) and fader (front/rear) processor
for quality audio applications in car radio and Hi-Fi
systems.

TDA7314

WITH LOUDNESS

SDIP24

ORDERING NUMBER: TDA7314

Selectable input gain and internalloudness function
are provid ed. Control is accomplished by serial bus
microprocessorinterface.
TheAC signalsettingis obtainedbyresis tornetwo rks
andswitchescombinedwithoperationalamplifiers.

Thanks to the used BIPOLAR/CMOS Tecnology ,
LowDistortion, Low Noiseand DC steppingare ob­tained.

PIN CONNECTION (Topview)

November 1999

1/12

TDA7314

TEST CIRCUIT

THERMAL DATA

Symbol Description Value Unit

R

thj-pins

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

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

T

amb

T

stg

Operating Supply Voltage 10.2 V

S

Operating Ambient Temperature -40 to 85
Storage Temperature Range -55 to +150 °C

QUICK REFERENCEDATA

Symbol Parameter Min. Typ. Max. Unit

V

V

CL

THD Total Harmonic Distortion V = 1Vrms f = 1KHz 0.01 0.1 %

S/N Signal to Noise Ratio 106 dB

S

Supply Voltage 6 9 10 V

S

Max. input signal handling 2 Vrms

Channel Separation f = 1KHz 103 dB

C

Volume Control 1.25dBstep -78.75 0 dB
Bass and TrebleControl 2db step -14 +14 dB
Fader and Balance Control 1.25dB step -38.75 0 dB
Input Gain 6.25dBstep 0 18.75 dB
Mute Attenuation 100 dB

C

°

2/12

BLOCK DIAGRAM

TDA7314

3/12

TDA7314

ELECTRICAL CHARACTERISTICS (refer to the test circuit T

=25°C, VS= 9V, RL= 10KΩ,RG=

amb

600Ω, allcontrols flat(G = 0), f = 1KHz unless otherwisespecified)

Symbol Parameter Test Condition Min. Typ. Max. Unit

SUPPLY

V

S

I

S

SVR Ripple Rejection 60 80 dB

Supply Voltage 6 9 10 V
Supply Current 8 11 mA

INPUT STAGE

G
G
G

R

V

CL

R

INmin

INmax

STEP

e

IN

V

DC

II

L

Input Resistance Pin 9, 11 35 50 70 K
Clipping Level 2 2.5 Vrms
Output Loadresistance pin 7, 17 2 KΩ
Min. Input Gain -1 0 1 dB
Max. Input Gain 18.75 dB
Step Resolution 6.25 dB
Input Noise G = 18.75dB 2 µV
DC Steps adjacent gain steps 4 20 mV

G = 18.75 to Mute 4 mV

VOLUMECONTROL

R

IV

C

RANGE

A

VMIN

A

VMAX

A

STEP

E

A

E

T

V

DC

Input Resistance 20 33 50 kΩ
Control Range 70 75 80 dB
Min. Attenuation -1 0 1 dB
Max. Attenuation 70 75 80 dB
Step Resolution 0.5 1.25 1.75 dB
Attenuation Set Error Av = 0to -20dB

Av = -20to -60dB

-1.25

-3

0 1.25

2
Tracking Error 2dB
DC Steps adjacent attenuation steps

From 0dB to Av max

0

0.5

3

7.5

SPEAKERATTENUATORS

Ω

dB
dB

mV
mV

C
S

A

range
STEP

E

MUTE

V

DC

A

Control Range 35 37.5 40 dB
Step Resolution 0.5 1.25 1.75 dB
Attenuation set error 1.5 dB
Output Mute Attenuation 80 100 dB
DC Steps adjacent att. steps

from 0 to mute

0
1

BASS CONTROL (1)

Gb Control Range Max. Boost/cut +12 +14 +16 dB

B

STEP

R

B

Step Resolution 1 2 3 dB
Internal Feedback Resistance 34 44 58 KΩ

TREBLECONTROL (1)

Gt Control Range Max. Boost/cut +13 +14 +15 dB

Step Resolution 1 2 3 dB

4/12

T

STEP

10

3

mV
mV

TDA7314

ELECTRICALCHARACTERISTICS(continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

AUDIO OUTPUTS

V

OCL

R

L

C

L

R

OUT

V

OUT

Clipping Level d = 0.3% 2 2.5 Vrms
Output LoadResistance 2 KΩ
Output LoadCapacitance 10 nF
Output resistance 30 75 120

Ω

DC Voltage Level 4.2 4.5 4.8 V

GENERAL

e

NO

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

d Distortion A

Sc Channel Separation left/right 80 103 dB

Output Noise BW = 20-20KHz, flat

output muted
all gains = 0dB

A curve all gains = 0dB 3 µV

O

=0,VIN= 1Vrms

V

A

= -20dB VIN= 1Vrms

Total Tracking error A

V

= 0 to -20dB

V

V

= 0.3Vrms

IN

-20 to -60 dB

2.5
515

µV
µ

= 1Vrms 106 dB

0.01

0.09

0.04

0
0

0.1

0.3

1
2

%
%
%

dB
dB

V

BUS INPUTS

V

IL

V

IH

I

IN

V

O

Note:

(1) Bass and Treble response seeattached diagram (fig.19). The center frequencyand quality of the resonance behaviour can be choosenby

the external circuitry. A standard first order bass response can be realized by a standard feedback network.

Input Low Voltage 1V
Input High Voltage 3 V
Input Current -5 +5
Output VoltageSDA

IO= 1.6mA 0.4 V

A

µ

Acknowledge

Figure 1: LoudnessversusVolume Attenuation

Figure2: Loudnessversus Frequency

LOUD

= 100nF)

(C

5/12

TDA7314

Figure 3: LoudnessversusExternal Capacitors

LOUDNESS

=9V

V

S

Volume = -40dB
All other control flat
C

= 2.2µF

in

= 220nF,100nF, 33nF, 10nF, Open, Shorterto Vref

C

loud

Figure 5: Signalto Noise Ratiovs. Volume

Setting

Figure4: Noisevs. Volume/GainSettings

Figure6: Distortion& Noisevs. Frequency

Figure 7: Distortion& Noisevs. Frequency

6/12

Figure8: Distortionvs. Load Resistance

TDA7314

Figure 9: ChannelSeparation(L → R) vs.

Frequency

Figure 11: OutputClipping Level vs. Supply

Voltage

Figure10: SupplyVoltage Rejection vs.

Frequency

Figure12: QuiescentCurrent vs. SupplyVoltage

Figure 13: SupplyCurrentvs. Temperature

Figure14: BassResistance vs.Temperature

7/12

TDA7314

Figure 15: TypicalTone Response(with the ext.

components indicatedin the test
circuit)

SOFTWARE SPECIFICATION
InterfaceProtocol

The interfaceprotocol comprises:

A startcondition (S)
A chip address byte, containing the TDA7314

address(the 8th bit of the byte must be 0). The
TDA7314must always acknowledgeat the end
of each transmitted byte.

A sequenceof data (N-bytes+ acknowledge)
A stopcondition (P)

TDA7314 ADDRESS

MSB first byte LSB MSB LSB MSB LSB

S10001000

ACK

DATA

ACK

DATA

ACK

P

Data Transferred (N-bytes+ Acknowledge)
ACK = Acknowledge
S = Start

P = Stop

MAX CLOCK SPEED 100kbits/s

SOFTWARESPECIFICATION

Chip address

1

MSB

DATA BYTES

Ax = 1.25dB steps; Bx= 10dB steps; Cx = 2dB steps; Gx = 6.25dBsteps

0001000

MSB LSB FUNCTION

0
1
1
1
1
0
0
0

0
1
1
0
0
1
1
1

B2

0
1
0
1
0
1
1

B1
B1
B1
B1
B1
G1

0
1

LSB

B0
B0
B0
B0

B0
G0
C3
C3

A2
A2
A2
A2
A2

S2
C2
C2

A1
A1
A1
A1
A1
S1
C1
C1

A0
A0
A0
A0
A0

S0
C0
C0

Volume control
Speaker ATT LR
Speaker ATT RR
Speaker ATT LF
Speaker ATT RF
Audio switch
Bass control
Treble control

8/12

SOFTWARESPECIFICATION (continued)
DATA BYTES(detailed description)

Volume

MSB LSB FUNCTION

0 0 B2 B1 B0 A2 A1 A0 Volume 1.25dB steps

0
0
0
0
1
1
1
1

0 0 B2 B1 B0 A2 A1 A0 Volume 10dB steps

0
0
0
0
1
1
1
1

0
0
1
1
0
0
1
1

0
1
0
1
0
1
0
1

0
0
1
1
0
0
1
1

0
1
0
1
0
1
0
1

For examplea volume of -45dBis givenby:
00100100

TDA7314

0

-1.25

-2.5

-3.75

-5

-6.25

-7.5

-8.75

0

-10

-20

-30

-40

-50

-60

-70

Speaker Attenuators

MSB LSB FUNCTION

1
1
1
1

0
0
1
1

0
1
0
1

B1
B1
B1
B1

0
0
1
1

11111 Mute

B0
B0
B0
B0

0
1
0
1

A2
A2
A2
A2

0
0
0
0
1
1
1
1

A1
A1
A1
A1

0
0
1
1
0
0
1
1

A0
A0
A0
A0

0
1
0
1
0
1
0
1

Speaker LF
Speaker RF
Speaker LR
Speaker RR

For exampleattenuationof 25dBon speakerRF is givenby:
10110100

0

-1.25

-2.5

-3.75

-5

-6.25

-7.5

-8.75
0

-10

-20

-30

9/12

TDA7314

Audio Switch

MSB LSB FUNCTION

0 1 0 G1 G0 S2 S1 S0 Audio Switch

0
0
1

0
1

0
0
1
1

0
1
0
1

1

0
1
0
1

For exampleto selectthe stereo1 input with a gain of +12.5dB, loudnesson, the 8 bit stringis:
01001000

(*) Stereo 2, 3, 4 are connectedinternally but notavailable on pins.

Bass and Treble

Stereo 1
Stereo 2 (MUTE) (*)
Stereo 3 (MUTE) (*)
Stereo 4 (MUTE) (*)
LOUDNESS ON
LOUDNESS OFF

+18.75dB
+12.5dB
+6.25dB
0dB

0
0

1
1

1
1

0
1

C3
C3

0
0
0
0
0
0
0
0

1
1
1
1
1
1
1
1

C2
C2

0
0
0
0
1
1
1
1

1
1
1
1
0
0
0
0

C3 = Sign
For exampleBass at -10dBis obtainedby the following8 bit string:
01100010

C1
C1

C0
C0

0
0
1
1
0
0
1
1

1
1
0
0
1
1
0
0

0
1
0
1
0
1
0
1

1
0
1
0
1
0
1
0

Bass

Treble

-14

-12

-10

-8

-6

-4

-2
0

0
2
4
6
8

10
12
14

10/12

TDA7314

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 0.009 0.0098 0.0150
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

OUTLINE AND

MECHANICAL DATA

SDIP24 (0.300”)

BeB1

D

24

1

13

12

A2

A1

Stand-off

F

SDIP24

E

E1

LA

e1
e2

c

E

.015
0,38

Gage Plane

e3
e2

11/12

TDA7314

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

The ST logo is a registeredtrademark of STMicroelectronics

 1999 STMicroelectronics – Printed in Italy – All Rights Reserved

STMicroelectronics GROUP OF COMPANIES

Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco -

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

http://www.st.com

12/12