SGS Thomson Microelectronics TDA7336D Datasheet

TDA7336

STEREO PREAMP + AMS + DOLBY B*

NOISE REDUCTIONPROCESSOR

DUAL CHANNEL PROCESSOR FOR PLAYBACK APPLICATIONS.

STEREODOLBYB NR SYSTEM LOW NOISE HEAD PREAMPLIFIER MUTE, AMS (AUDIO MUSIC SENSOR)

FUNCTIONS INTERNALSWITCHES FOR EQUALIZATION DOLBY REFERENCE LEVEL -6dBm

(388.2mV

RMS)

MINIMUM NUMBER OF EXTERNALCOMPONENTS

LOW SUPPLY CURRENT(18mA) MIXED BIPOLAR/CMOSTECHNOLOGY

DESCRIPTION

The TDA7336 is a monolithic BICmos IC designed for use in stereo cassette player systems.

The device includes two separate audio channels composed by low noise preamplifier, Dolby B noise reduction system and Audio Music Sensor.

The dual preamplifier contains mute, metal/normal facilities for amplification of low level signal in applications requiring very low noise performances.

Each channel consists of two cascaded operational amplifiers.

The first one, AMP1, has a fixed gain of 36dB, and allows magnetic heads connection directly to ground. The secondone, AMP2, is a standard operational amplifier whose equalizing external componentsfix the frequencyresponse.

The Audio Music Sensor circuit detects the interprogram space and then the starting point of musical programs (the interprogram time and program detectiontime are externallyselectable).

The device contains Dolby B decoder NR chains requiring very few external components and do not require coils.

* Dolby B and the Double-D symbol are

trademarks of Dolby Laboratories Licensing Corporation, San Francisco, California94103-4813,USA. This device is available only to Licensing and application information may be obtainedfrom Dolby Lab.

November 1999



DINL

AMS SW

INTP INTS

MUTE

DOUTL

TCL

IREF

N.C.

1

3

2

4 5 6 7 8 9

Vs

VREF

DOUTR

NR SW TCR

AMSGin

AMSOUT

GND DIG

DINR23 22 21 20 19

17

18

16 15

D94AU052

10 11 12 13 14

28 27 26 25 24

GND

INL

EQLI

EQLO

OUTL OUTR

EQRO

EQRI

INR

EQ.SW

PIN CONNECTION

(Top view)

SO28

ORDERING NUMBER: TDA7336

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ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

S

Supply Voltage 12 V

P

tot Total Power Dissipation 1 W

T

op

Operating Temperature Range -40 to 85

°

C

T

stg

Storage Temperature Range -40 to 150

°

C

THERMAL DATA

Rth j-pins Thermal resistance junction-pins 85 °C/W

PIN FUNCTIONS

N. Name VDC (V) Function

1 GND Ground 2 IN L 0 Preamplifier Left Input

3,26 EQLI, EQRI 4.6 Equalizer Inputs 4, 25 EQLO, EQRO 4.6 Equalizer Outputs 5, 24 OUTL, OUTR 4.6 Preamplifier Outputs 6, 23 DINL, DINR V

ref

Dolby NR Inputs 7 AMS SW 5.6 Audio Music Sensor Switch (ON/OFF) HIGH = ON 8 INTP Interprogram Time Constant (”Signal Detection”) 9 INTS Interspace Time Constant (”Blank Detection”)

10 MUTE Mute Switch ON = LOW (2) 11, 18 TLC, TCR 0.4 Dolby Time Constants 12, 17 DOUTL, DOUTR V

ref

Dolby Outputs

13 I

ref

1.2 Reference Current Source

15 V

S Positive Power Supply

16 V

ref V

S

/2 Reference Voltage 19 NR SW Noise reduction ON/OFF: HIGH =OFF (2) 20 AMS GIN 1.4 Audio Music Sensor Input Pin 21 AMS OUT Audio Music SensorOutput Pin (open collector configuration, see Fig. 2) 22 GND DIG. 0 Digital Ground 27 IN R 0 Preamplifier Right Input 28 EQ SW 0 Equalizer Switch (Low = normal position High = metal position)

(2) Internal pull-up resistor (digital high level if pin left open)

TDA7336

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AMS

10nF

C4

6.8K

R5

300K

R6

1.2K

R2

1K

TR2

1µ

F

C2

0.33µF C6(*)

EQRI EQRO OUTR

26 25

RM RN

36dB

AMP1 AMP2

27INR

INPUT R

DINR

24 23

0.22µFC8 R8

10K

AMSGin

20 22

AMSGout

21

R10

100K

Vs

DOLBY

18

TCR

0.68µF(*)C11

DOUTR

OUTR

4.7µ

F

C13

BIAS

4.7µF C14

R13

100K

0.22µF C18 R11

43K

Vs

GND

Vs

0.68µF C19

NRSW

Vs

17

19

16

15

13

1

RNRM

AMP1 AMP2

36dB

2

INPUT L

INL

1.2K

3 4 28 5

300K

R4

6.8K

R3

1.2K

R1

1K

TR1

1µ

F

C1

10nF

C3

EQLI EQLO

DOLBY

0.33µF C5(*) 30K

0.68µ

F

C20

Vs

GND

OUTL

DINL

6

100nF C15

AMSSW

7

470K

R7

C7

8

INTP

0.1µF

11

C9

1µF

Vs

100K

R9

TCL

9

INTS

0.68µ

F

(*)

12

DOUTL

C12

4.7µF

OUTL

GND

IREF

VREF

Vs

GND

30K

R15

C16

100nF

D93AU049A

10

MUTE

EQ SW

C10

(*) Capacitor tolerance is ±10%

R14

Figure 1: ApplicationCircuit

TDA7336

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Figure 1a: Components& Top Copper Layer of the Fig. 1 (1:1 scale).

Figure 1b:

Bottom Copper Layer of the Fig. 1 (1:1 scale).

TDA7336

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AMS

10nF

C4

6.8K

R5

300K

R6

1.8K

R2

1µ

F

C2

0.33µF C6(*)

EQRI EQRO OUTR

26 25

RM RN

36dB

AMP1 AMP2

27INR

INPUT R

DINR

24 23

0.22µFC8 R8

10K

AMSGin

20 22

AMSGout

21

R10

100K

Vs

DOLBY

18

TCR

0.68µF(*)

C11

DOUTR

OUTR

4.7µ

F

C13

BIAS

4.7µF C14

0.22µF C18 R11

43K

Vs

GND

Vs

NRSW

Vs

17

19

16

15

13

1

RNRM

AMP1 AMP2

36dB

2

INPUT L

INL

1.2K

3 4 28 5

300K

R4

6.8K

R3

1.8K

R1

1µ

F

C1

10nF

C3

EQLI EQLO

DOLBY

0.33µF C5(*) VsGND

OUTL

DINL

6

100nF C15

AMSSW

7

470K

R7

C7

8

INTP

0.1µF

11

C9

1µF

Vs

100K

R9

TCL

9

INTS

0.68µ

F

(*)

12

DOUTL

C12

4.7µF

OUTL

GND

IREF

VREF

D93AU050A

10

MUTE

EQ SW

600

600300pF

300pF

C10

(*) Capacitor tolerance is ±10%

TEST CIRCUIT

TDA7336

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ELECTRICAL CHARACTERISTICS (VS =8.5V;f=1KHz;Rg=600ΩT

amb

=25°C; R11 = 43KΩ

all level referenced to -6dBm/400Hz, at D

out with NR SW OFF; unle ss o t herwise sp ecif ied

see a pplicat ion circuit of Fig. 1) NAB METAL po sition .

SUPPLY

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

S

Supply Voltage 8 8.5 10.5 V

I

S

Supply Current 11 18 26 mA

V

ref

Reference Voltage (pin 16) 4 4.3 4.6 V

V

DC DC Voltage pin 13 (R

11

= 43K) 1.15 1.25 1.35 V

SVR Ripple Rejection

(Input Referred)

V

ripple

=0.3Vrms DolbyOFF

f

ripple

=1KHz DolbyON

80 85

90 95

dB dB

MUTE

th

Mute Threshold Pin 10

ON OFF

0

2.0

0.8 V

S

V V

I

MUTE

Mute Current 10 20

µ

A

MUTE

A

Mute Attenuation 55 65 dB

PREAMPLIFIER

R

I

Input Resistance (pin 2, 27) 30 50 70 K

Ω

I

Input Bias Current 10

µ

A

G

V Closed Loop Gain pin 3, 4 and 25, 26 shorted 32.5 35.5 38.5 dB

∆G

V Closed Loop Gain Match -1 1 dB

R

M

Resistance Metal Position 4.35 5.8 7.25 K

Ω

R

N

Resistance Normal Position 50 160 300

Ω

e

N

Total Input Noise Unw.B=20Hzto20KHz Rg=0Ω;

R

g =600Ω;

A weighted R

g

=600Ω;

0.45

0.8

0.5

µ

V

µV µ

V

R

O

Output Impedance (Pin 5, 24) 0.9 1.2 1.7 K

Ω

EQ

l

Normal Low Level (pin 28) 0 1.5 V

EQ

h Metal High Level (pin28) 3.5 VS V

∆R

M

Metal Resistance Matching –2 0 +2 %

AUDIO MUSIC SENSOR

IAMSOUT AMS Output Current 5 mA

VAMS

OUT

AMS Output Low Level IAM

OUT

= 2mA 200 800 mV

R

P

20 Input Impedance 0.8 1.1 1.4 K

Ω

AMS

swl

AMS OFF Low Level 0 0.8 V

AMS

swh AMS ON High Level 2 VS V

V

TH1 Interprogram Threshold Voltage (pin8) 1.2 1.45 1.7 V

VTH

2

Interspace Threshold Voltage (pin 9) 4 4.3 4.6 V

AMS

th

AMS Threshold Level see note (3) 0.6 1 1.4 V

IAMS

sw

AMS Switch pin Current 5 10 15

µ

A

DOLBY SECTION

GV Voltage Gain f = 1KHz; OFF -1 0 1 dB

∆G

V Gain Matching OFF -0.5 0.5 dB

RD

I

Dolby Input Res. (pin 6, 23) 46 63 K

Ω

S/H Signal Handling V

S

= 8V; THD = 1% OFF 12 13 dB

R

DO

Dolby Output Imp. (pin 12, 17) 100 200 300

Ω

B DEC 1 Decode Out f = 10KHz;V

I = 0.4dB ON -1.5 0 1.5 dB

TDA7336

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