Datasheet TEA0678T-V2-S1, TEA0678T-V2 Datasheet (Philips)

DATA SH EET

Preliminary specification
Supersedes data of August 1993
File under Integrated Circuits, IC01

1996 Jun 06

INTEGRATED CIRCUITS

TEA0678

Dual Dolby* B-type noise reduction
circuit, automatic music search,
with differential outputs and mute

1996 Jun 06 2

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

FEATURES

• Dual noise reduction (NR) channels

• Head pre-amplifiers

• Reverse head switching

• Automatic Music Search (AMS)

• Mute position

• Equalization with electronically switched time constants

• Dolby reference level = 387.5 mV

• 32 pins

• Switch inputs TTL compatible

• Differential output stage has:

– Capability to drive 1.2 nF capacitive load
– Capability to drive 1 kΩ load
– Short-circuit proof
– Short-circuit proof to 16 V via coupling capacitor.

• Improved EMC behaviour.

GENERAL DESCRIPTION

The TEA0678 is a bipolar integrated circuit that provides
two channels of Dolby B noise reduction for playback
applications in car radios. It includes head and
equalization amplifiers with electronically switchable time
constants. Furthermore it includes electronically
switchable inputs for tape drivers with reverse heads.
This device also detects pauses of music in Automatic
Music Search (AMS) mode, with a delay time fixed
externally by a resistor. The short-circuit proof output
stage of the TEA0678 is differential and provides muting.
The device will operate with power supplies in the range of

7.6 to 12 V, output overload level increasing with increase
in supply voltage. Current drain varies with supply voltage,
noise reduction on/off and AMS on/off so it is advisable to
use a regulated power supply or a supply with a long time
constant.
.Current drain varies with these variables:

Supply voltage
Noise reduction on/off
AMS on/off.

Because of this current drain variation it is advisable to use
a regulated power supply or a supply with a long time
constant.

QUICK REFERENCE DATA

ORDERING INFORMATION

Remark Dolby*: Available only to licensees of Dolby Laboratories Licensing Corporation, San Francisco, CA94111,

USA, from whom licensing and application information must be obtained. Dolby is a registered trade-mark of Dolby
Laboratories Licensing Corporation.

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

V

CC

supply voltage 7.6 10 12 V

I

CC

supply current − 25 28 mA
signal plus noise-to-noise ratio 78 84 − dB

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TEA0678 SDIP32

plastic shrink dual in-line package; 32 leads (400 mil)

SOT232-1

TEA0678T SO32 plastic small outline package; 32 leads; body width 7.5 mm SOT287-1

SN+

N

--------------

1996 Jun 06 3

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

BLOCK DIAGRAM

handbook, full pagewidth

19

180 Ω

V

CC

10 µF

24

kΩ

18

kΩ

27

kΩ

8.2

kΩ

330

kΩ

1 kΩ

470

pF

470

pF

10

nF

4.7 nF

270 kΩ

180 kΩ

24 

kΩ

4.7 µF

4.7 µF

1 µF

4.7 nF

15 nF

100

µF

330

nF

100

nF

C

L

R

L

R

L

R

t

AMS

delay

time

output 

A+

output 

A−

V

ref

MED769

from

microprocessor

LOW: NR ON

OPEN: OFF

HIGH: AMS ON

180 Ω

10 µF

8.2

kΩ

330

kΩ

1 kΩ

470

pF

470

pF

10

nF

270 kΩ

180 kΩ

4.7 µF

10

µF

4.7 µF

1 µF

15 nF

330

nF

100

nF

C

L

R

L

R

L

output 

B+

output

B−

V

ref

from

microprocessor

LOW: MUTE ON

HIGH: MUTE OFF

LOW: INPUT 1

HIGH: INPUT 2

from

microprocessor

EQ switch from

microprocessor

LOW: 120 µs

OPEN: 70 µs

AMS

out

head switch

input

15

kΩ

15

kΩ

DELAY

TIME

LEVEL

DETECTOR

POWER

SUPPLY

AMS

EQ

NR

MUTE

HEAD-

SWITCH

LOGIC

DOLBY B NR CIRCUIT

DOLBY B NR CIRCUIT

1

23

4

5

6

7

8

910

11

12

13

14

15 16

17

18

20

21

22

23

24

25

26

27

28

29

30

31

32

AMS

PROCESSOR

GND

V

CC

V

ref

TEA0678

EQ

AMP.

EQ

AMP.

PRE

AMP.

PRE

AMP.

Fig.1 Block and application diagram.

1996 Jun 06 4

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

PINNING

SYMBOL PIN DESCRIPTION

OUTA− 1 negative output channel A
OUTA+ 2 positive output channel A
NR/AMS 3 noise reduction/music search switch
INCA 4 input mute/output stage channel A
OUTCA 5 output Dolby B processor channel A
INTA 6 integrating filter channel A
CONTRA 7 control voltage channel A
HPA 8 high-pass filter channel A
SCA 9 side chain channel A
TD 10 delay time constant
EQA 11 equalizing output channel A
EQFA 12 equalizing feedback channel A
V

CC

13 supply voltage
INA1 14 input channel A1 (forward or reverse)
V

ref

15 reference voltage
INA2 16 input channel A2 (reverse or forward)
INB2 17 input channel B2 (reverse or forward)
HS 18 head switch input
INB1 19 input channel B1 (forward or reverse)
GND 20 ground
EQFB 21 equalizing feedback channel B
EQB 22 equalizing output channel B
AMSEQ 23 AMS output and EQ switch input
SCB 24 side chain channel B
HPB 25 high-pass filter channel B
CONTRB 26 control voltage channel B
INTB 27 integrating filter channel B
OUTCB 28 output Dolby B processor channel B
INCB 29 input mute/output stage channel B
MUTE 30 mute switch
OUTB+ 31 positive output channel B
OUTB− 32 negative output channel B

Fig.2 Pin configuration.

handbook, halfpage

TEA0678

MED770

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16

32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17

OUTA−
OUTA+

NR/AMS

INCA

OUTCA

INTA

CONTRA

HPA
SCA

TD

EQA

EQFA

V

CC

INA1

OUTB−
OUTB+
MUTE
INCB

INTB
CONTRB

OUTCB

HPB
SCB
AMSEQ
EQB
EQFB
GND
INB1

V

ref

INA2

HS
INB2

1996 Jun 06 5

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

FUNCTIONAL DESCRIPTION
Noise Reduction (NR) is enabled when pin NR/AMS is

connected to ground and disabled when open-circuit (left
floating from a 3-state output).

Dolby noise reduction only operates correctly if 0 dB Dolby
level is adjusted at 387.5 mV.

Automatic Music Search (AMS) is enabled when pin
NR/AMS is connected to HIGH (5 V) and disabled when
open-circuit (left floating from a 3-state output). In AMS
mode the signal of both channels are rectified and then
added. This means, even if one channel signal appears
inverted to the other channel, with the TEA0678 the normal
AMS function is ensured (see Figs 4, 5 and 6).

Equalization time constant switching (70 µs or 120 µs)
is achieved when pin AMSEQ is connected to GND via an
18 kΩ resistor (120 µs), or left open-circuit (70 µs).
This does not affect the AMS output signal during AMS
mode (see Fig.1).

Head switching is achieved when pin HS is connected to
GND (input IN1 active) or connected to HIGH (5 V) level
(input IN2 active). If left open-circuit IN1 is active.

Mute is enabled when pin MUTE is connected to ground
and off when connected to HIGH (5 V) level. For smooth
switching a time constant is recommended. If left
open-circuit MUTE is active.

The differential output stage of each channel is
connected via a provision to the Dolby and pre-amplifier
part. This provision may be used for any processing of the
tape signal or to add another signal. Each output drives a
resistive load of nominal 10 kΩ and is capable of driving
1kΩ, also a capacitive load of 1.2 nF to ground and
between differential outputs. Each output can be
short-circuited to a battery (16 V) via a coupling capacitor
(4.7 µF).

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134); note1.

Notes

1. The device may not operate correctly when subjected to these ratings when the ratings exceed the electrical
characteristics of the device as specified in Chapter “Characteristics”. The device will recover automatically when the
environment is reduced to the requirements of the characteristics.

2. The TEA0678 allows a HIGH-level at switching pins without supply voltage (V

CC

= 0; stand-by mode). This means a

maximum input voltage of 6.5 V for the switching input pins.

3. Human body model (1.5 kΩ, 100 pF).

4. Machine model (0 Ω, 200 pF).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CC

supply voltage 0 16 V

V

i

input voltage (pins 1 to 32) except pin 15 (V

ref

); pin 3

(NR/AMS), pin 18 (HS) and pin 30 (MUTE) to V

CC

−0.3 +V

CC

V

input voltage at pin 3 (NR/AMS), pin 18 (HS) and
pin 30 (MUTE)

note 2 −0.3 +6.5 V

t

short

pin 15 (V

ref

) to VCC short-circuiting duration − 5s

T

stg

storage temperature −55 +150 °C

T

amb

operating ambient temperature −40 +85 °C

V

es

electrostatic handling voltage for all pins note 3 −2+2kV

note 4 −500 +500 V

1996 Jun 06 6

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

CHARACTERISTICS

VCC= 10 V; f = 20 Hz to 20 kHz; T

amb

=25°C; nominal load 10 kΩ; all levels are referenced to 775 mV (RMS) (0 dB) at
differential outputs (Vo=Vo+− Vo−), this corresponds to Dolby level 387.5 mV (RMS) (0 dB) at test point (OUTC);
see Fig.1; NR on/AMS off; EQ switch in the 70 µs position; unless otherwise specified.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

supply voltage 7.6 10 12 V

I

CC

supply current pins 14, 16, 17 and 19 connected to

V

ref

− 25 28 mA

f = 1 kHz; V

o

= 0 dB at each output − 26 37 mA

α

m

channel matching f = 1 kHz; Vo= 0 dB; NR off;

OUTA/OUTB

−0.5 − +0.5 dB

G

v

voltage gain (output stage) between OUT and OUTC; f = 1 kHz;

NR off

5.5 6 6.5 dB

G

mm

voltage gain mismatch
(output stage)

mismatch between OUT+ and
OUT−; f = 1 kHz; NR off

−0.5 − +0.5 dB

THD total harmonic distortion (2nd

and 3rd harmonic)

f = 1 kHz; V

o

=0dB − 0.08 0.15 %

f = 10 kHz; V

o

=6dB − 0.15 0.3 %

H

R

headroom at output VCC= 9 V; THD = 1%; f = 1 kHz 13 −−dB
signal plus noise-to-noise

ratio

internal gain 40 dB; linear;
CCIR/ARM weighted; decode mode;
see Fig.10

78 84 − dB

V

no(rms)

equivalent input noise voltage
in decode mode (RMS value)

NR off; unweighted;
f = 20 Hz to 20 kHz; R

source

=0Ω

−− 1.4 µV

PSRR power supply ripple rejection V

i(rms)

= 0.25 V; f = 1 kHz; see Fig.7

for unsymmetrical signal at OUTC

52 57 − dB

at differential OUT; note 1 49 52 − dB

f

o

frequency response
measured in encode mode;
referenced to TP

see Fig.10

V

o

= −25 dB; f = 0.2 kHz −22.9 −24.4 −25.9 dB

V

o

= 0 dB; f=1kHz −1.5 0 +1.5 dB

V

o

= −25 dB; f=1kHz −17.8 −19.3 −20.8 dB

V

o

= −25 dB; f=5kHz −18.1 −19.6 −21.1 dB

V

o

= −35 dB; f = 10 kHz −24.4 −25.9 −27.4 dB

α

cs

channel separation Vo= +10 dB; f = 1 kHz; see Fig.8 61 67 − dB

α

cc

crosstalk between active and
inactive input

NR off; f = 1 kHz; Vo= +10 dB;
see Fig.8

70 77 − dB

R

L

load resistance at each output
OUTA+, OUTA−, OUTB+ and
OUTB− (corresponds to 2 kΩ
at differential output)

AC-coupled f = 1 kHz; Vo= 12 dB;
THD=1%

10 −−kΩ

THD = 1%; note 2 1 −−kΩ

C

L

capacitive load at each output
(between OUT+ and OUT−)
and ground

C

Lmin

at each output to ground

(pins 1, 2, 31 and 32)

0.3 − 1.3 nF

G

v

voltage gain of pre-amplifier from pin INA1 or INA2 to pin EQFA

and from pin INB1 or INB2 to
pin EQFB; f = 1 kHz

29 30 31 dB

SN+

N

--------------

1996 Jun 06 7

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

V

I(offset)(DC)

DC input offset voltage − 2 − mV

I

i(bias)

input bias current −− 0.4 µA

R

EQ

equalization resistor 4.7 5.8 6.9 kΩ

R

I

input resistance head inputs 60 100 − kΩ

A

v

open-loop amplification pin INA1 or INA2 to pin EQA and

pin INB1 or INB2 to pin EQB

f = 10 kHz 80 86 − dB
f = 400 Hz 104 110 − dB

V

O(offset)(DC)

DC offset voltage at pins
OUT+ to OUT−

pins INA1, INA2, INB1 and INB2
connected to V

ref

−10 − +10 mV

V

mute(offset)

MUTE offset voltage at pins
OUT+ to OUT−

pins INA1, INA2, INB1 and INB2
connected to V

ref

−10 − +10 mV

V

ref

− V

OUTC

DC output offset voltage at
pins OUTCA and OUTCB

NR off; pins INA1, INA2, INB1 and
INB2 connected to V

ref

−0.15 − +0.15 V

I

O

DC output current pins INA1, INA2, INB1 and INB2

connected to V

ref

pin OUTC to ground −2 −−mA
pin OUTC to V

CC

0.3 −−mA
pin OUT± to ground −2.5 −−mA
pin OUT± to V

CC

2.5 −−mA

R

i

input resistance output stage
at pins INCA and INCB

10 16 − kΩ

Z

o

output impedance at each
output OUTA+, OUTA−,
OUTB+ and OUTB−

− 90 110 Ω

d

mute

mute depth at differential
output

NR off

f = 1 kHz −80 −−dB
f = 10 kHz −80 −−dB

AMSL AMS threshold level at

music to pause

NR off;f=10kHz; see Fig.9 −25 −22 −19 dB

AMSH AMS threshold level at

pause to music

note 3 −24 −21 −18 dB

t

d

AMS delay time range f = 10 kHz; 0 dB burst; see Table 1 − 23 to 160 − ms

t

r

AMS rise/delay time f = 10 kHz; 0 dB burst 2 − 10 ms

EMC DC offset voltage at

pins OUTA−, OUTA+,
OUTB+ and OUTB−

f = 900 MHz; V

i

=3V

(RMS)

;

see Figs 11, 12 and13

− 100 − mV

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1996 Jun 06 8

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

Switching thresholds

NR/AMS SWITCH (PIN 3)
V

IL

LOW level input voltage NR on −0.3 − +0.8 V

I

IL

LOW level input current NR on −10 −20 −40 µA

I

i(float)

allowed floating input current pin left open-circuit; NR/AMS off −10 0 +10 µA

V

float

floating voltage pin left open-circuit; NR/AMS off − 2.4 5 V

V

IH

HIGH level input voltage AMS on 4 − 5.5 V

I

IH

HIGH level input current AMS on 10 20 40 µA
EQUALIZATION (PIN 23)
I

EQ70

floating leakage current time constant 70 µs active +0.002 −−0.15 mA
V

EQ70

floating voltage time constant 70 µs active − 4.6 5 V
I

EQ120

input current time constant 120 µs active −0.25 −−1mA
AMS OUTPUT (PIN 23)
V

OH

HIGH level output voltage music present 4 4.6 5 V
I

OH

HIGH level output current current capability +0.01 −−1mA
I

OH

HIGH level output current current capability; note 4 +0.01 −−0.15 mA
V

OL

LOW level output voltage music not present −− 0.8 V
I

OL

LOW level output current current capability −0.01 − +1 mA
MUTE SWITCH (PIN 30)
V

IL

LOW level input voltage MUTE on −0.3 − +0.8 V
I

IL

LOW level input current MUTE on −−4 −100 µA
V

IH

HIGH level input voltage MUTE off 4 − 5.5 V
I

IH

HIGH level input current MUTE off; smooth switching with a

time constant is recommended

− 10 100 µA

HEAD SWITCH (PIN 18)
V

IL

LOW level input voltage INPUT 1 on −0.3 − +0.8 V
I

IL

LOW level input current INPUT 1 on −− −100 µA
V

IH

HIGH level input voltage INPUT 2 on 4 − 5.5 V
I

IH

HIGH level input current INPUT 2 on − 30 100 µA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

1996 Jun 06 9

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

Notes to the characteristics

1. For the signal to be doubled (+6 dB) at differential output as a function of OUTC, the signal-to-ripple ratio is improved
at differential output for approximately 3 dB.

2. By using the small load, the output voltage may be divided by −0.8 dB.

3. The high speed of the tape (FF, REW) at the tape head during AMS mode causes a transformation of level and
frequency of the originally recorded signal. It means a boost of signal level of approximately 10 dB and more for
recorded frequencies from 500 Hz up to 4 kHz. So the threshold level of −22 dB corresponds to signal levels in
PB mode of approximately −32 dB. The AMS inputs for each channel are pin SCA and pin SCB. As the frequency
spectrum is transformed by a factor of approximately 10 to 30 due to the higher tape speed in FF, REW, the
high-pass filter (4.7 nF/24 kΩ) removes the effect of offset voltages but does not affect the music search function.
In the application circuit (Fig.1) the frequency response of the system between tape heads input, e.g. pins INA2/INB2,
to the AMS input pins SCA and SCB is constant over the whole frequency range (see Fig.3). The frequency
dependence of threshold level is shown in Fig.3.

4. In AMS OFF mode, pin AMSEQ is HIGH level, the equalization time constant will be switched by pulling
approximately 200 µA out of pin AMSEQ. This means for the device connected to pin AMSEQ, a restriction of input
current at HIGH level less than 200 µA during AMS off; otherwise the switching of the time constants is disabled but
fixed at 120 µs. If the following devices, input consumes more than 200 µA, this input has to be disconnected in AMS
off mode. (To ensure switching the currents for the different switched modes are specified with a tolerance of±50 µA
in Chapter “Characteristics”.) For an application with a fixed EQ time constant of 120 µs the equalizing network may
be applied completely external. Change 8.2 kΩ resistor to 14 kΩ the internal resistor REQ= 5.8 kΩ is short-circuited
by fixing the EQ switch input at the 70 µs position (I

EQ70

).

Table 1 Blank delay time set by resistor R

t

at pin TD

RESISTOR VALUE R

t

(kΩ)

DELAY TIME t

d

TYP. (ms)

TOLERANCE

(%)

68 23 20
150 42 15
180 48 15
220 56 15
270 65 10
330 76 10
470 98 10
560 112 10
680 126 10
820 142 10

1000 160 10

1996 Jun 06 10

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

General note

It is recommended to switch off VCC with a gradient of 400 V/s at maximum to avoid plops on tape in the event of contact
between tape and tape head while switching off.

Fig.3 AMS threshold level.

(1) AMS threshold level for application circuit (Fig.1).
(2) AMS threshold level for test circuit (Fig.9).

handbook, full pagewidth

−60

−20

MED623

10

2

10

3

10

4

10

5

−40

−50

−30

(dB)

(Hz)

(1)

(2)

General note on AMS

The speed of tape at the tape head during FF, REW
depends on the diameter of the tape on the spindle.
Depending on this speed, the recorded signal occurs
transformed in frequency and magnitude as a function of
the original signal in playback mode speed. For example:
A recorded pause of 3 s passes the tape head at its
highest speed in 111 ms, e.g. during FF mode near tape
end. This time constant of 111 ms corresponds to a pause
of 1.3 s at the beginning of the tape in playback mode.

Thus a pause T is uniquely defined outside the interval

1.3 s < T < 3 s. Inside this interval T will be recognized as
a pause or not dependent on the local point of tape,
respectively the speed of tape. Times of pauses described
investigated for this document are valid for tape devices

with a speed of its spindle (FF, REW):
respectively 12 to 27 times of the playback speed.

ωr51

1
s

-- -

=

1996 Jun 06 11

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

Short description ‘music search’

A system for ‘music search’ mainly consists of a level and
a time detection (see Fig.4). For adapting and decoupling
the input signal will be amplified (A), then rectified (B) and
smoothed with a time constant (C). So the voltage at (C)
corresponds to the signal level and will be compared to the
predefined pause level at the first comparator (D), the level
detector. If the signal level becomes smaller than the
pause level, the level detector(D) changes its output
signal. Due to the output level of the level detector the

capacitor of the second time constant (E) will be charged,
respectively discharged. If the pause level of the input
signal remains for a certain time, the voltage at the
capacitor reaches a certain value, which corresponds to
an equivalent time value due to the charging. The voltage
at the capacitor will be compared to a predefined
time-equivalent voltage by the second comparator (F), the
time detector. If the pause level of the input signal remains
for this predefined time, the time detector (F) changes its
output level for ‘pause found’ status.

In this IC the signals of both channels are first rectified and then added. The signal behind the adder is described by
V

add

= V

chanA

 + V

chanB

, where:

V

chanA

: absolute value channel A

V

chanB

: absolute value channel B

This means, even if one channel signal appears phase shifted to the other channel (at worst cases inverted), the
TEA0678 will ensure the normal AMS function.

Fig.4 Integrated ‘music search’ function.

handbook, full pagewidth

MED772

COMPARATOR 1 COMPARATOR 2

t

1

t

2

INA

INB

AMPLIFIER

RECTIFIER

(A)

(B)

(C)

(D)

(E) (F)

OUT

V

t

V

I

LEVEL DETECTOR TIME DETECTOR

1996 Jun 06 12

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

Description of the principle timing diagram for AMS-scan mode without initial input signal (see Fig.5)

Fig.5 AMS-scan mode without initial input signal.

handbook, full pagewidth

MED773

output signal

to microprocessor

4.5 V

V

AMSEQ

time threshold

upper threshold

(hysteresis)

V

t

V

REF

level threshold

V

l

V

in

tr: rise time
td: delay time
tb: burst time
tp: pause time
tf: fall time

Vl: voltage at
level detector
input
pin 7 (CONTRA)

Vt: voltage at
time detector
input
pin 26 (CONTRB)

t

t

t

t

AMS on

t

r

t

d

t

f

tb<t

r

tp<t

d

t

0

t3t

4t5t6

t

7

t8t9t

10

t11t12t13t

14t15

By activating AMS-scan mode, the AMS output level
directly indicates whether the input level corresponds to a
pause level (V

AMSEQ

= LOW) or not (V

AMSEQ

= HIGH).
At t0 the AMS-scan mode is activated. Without a signal at
Vin, the following initial procedure runs until the AMS
output changes to LOW level: due to no signal at Vin the
voltage at the level detector input VI (pin 7, CONTRA)
remains below the level threshold and the second time
constant will be discharged (time detector input Vt).
When Vt passes the time threshold level, the time detector
output changes to LOW level. Now the initial procedure is
completed.

If a signal burst appears at t3, the level detector input
voltage rises immediately and causes its output to charge
the second time constant, which supplies the input voltage
Vt for the time detector. When Vt passes the upper

threshold level after the rise time tr (at t4), the AMS output
changes to HIGH. If the signal burst ends at t5 the level
detector input VI falls to its LOW level. When passing the
level threshold at t6, the discharging of the second time
constant begins. Now the circuit measures the delay time
td, which is externally fixed by a resistor and defines the
length of a pause to be detected. If no signal appears at V

in

within the time interval td, the time detector output switches
the AMS output to LOW level at t7.

If a plop noise pulse appears at Vin (t8) with a pulse width
less than the rise time tr>tb, the plop noise will not be
detected as music. The AMS output remains LOW.

Similarly the system handles ‘no music pulses’ tp: when
music appears at t11 with a small interruption at t13, this
interruption will not affect the AMS output for tp<td.

1996 Jun 06 13

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

Description of the principle timing diagram for AMS-scan mode with initial input signal (see Fig.6)

Fig.6 AMS-scan mode with initial input signal.

handbook, full pagewidth

MED774

output signal

to microprocessor

4.5 V

V

AMSEQ

time threshold

upper threshold

(hysteresis)

V

t

V

REF

level threshold

V

l

V

in

tr: rise time
td: delay time
tb: burst time
tp: pause time
tf: fall time

Vl: voltage at
level detector
input
pin 7 (CONTRA)

Vt: voltage at
time detector
input
pin 26 (CONTRB)

t

t

t

t

AMS on

t

d

t

f

tb<t

r

tp<t

r

t0t

1

t5t

6

t

7

t8t9t

10

t11t12t13t

14

t

15

At t0 the AMS-scan mode is activated. With an input signal
at Vin, the following initial procedure runs until the circuit
gets a steady state status.

Due to the signal at Vin the voltage at the level detector
input VI (pin 7, CONTRA) slides to a value which is defined
by a limiter. This voltage causes the level detector output
charging the second time constant (time detector input Vt)
to its maximum voltage level at t1. Now the initial
procedure is completed.

The following behaviour does not differ from the
description in Section “Description of the principle timing
diagram for AMS-scan mode without initial input signal
(see Fig.5)”.

1996 Jun 06 14

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

TEST AND APPLICATION INFORMATION

andbook, full pagewidth

10 kΩ

1000

µF

100

nF

270 kΩ

180 kΩ

10 kΩ

20 kΩ

24 

kΩ

18 kΩ

20 kΩ

10 kΩ

24 kΩ

270 kΩ

180 kΩ

27

kΩ

4.7 µF

4.7 µF

1 µF

10 µF

10 µF

10 µF

1 µF

4.7 µF

4.7 µF

4.7 nF

15 nF

15 nF

4.7 nF

100

µF

100

nF

330

nF

100

nF

330

nF

C

L

R

L

R

L

C

L

R

L

R

L

output 

B−

output 

B+

from

microprocessor

HIGH: MUTE OFF

V

ref

AMS

out

EQ 

70 µs

from

microprocessor

LOW: INPUT 1

HIGH: INPUT 2

R

t

AMS

delay

time

output

A+

output 

A−

ON

NR

LOW: NR ON

V

ref

V

CC

= 10 V

0.25 V RMS

1 kHz

15

kΩ

15

kΩ

DELAY

TIME

LEVEL

DETECTOR

POWER

SUPPLY

AMS

EQ

NR

MUTE

HEAD-

SWITCH

LOGIC

DOLBY B NR CIRCUIT

DOLBY B NR CIRCUIT

1

23

4

5

6

7

8

910

11

12

13

14

15 16

17

18

1920

21

22
23

24

25

26

27

28

29

30

31

32

AMS

PROCESSOR

GND

V

CC

V

ref

TEA0678

EQ

AMP.

EQ

AMP.

PRE

AMP.

PRE

AMP.

MED775

Fig.7 Test circuit for power supply ripple rejection.

1996 Jun 06 15

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

ndbook, full pagewidth

19

200

Ω

470

pF

10

µF

100

nF

270 kΩ

180 kΩ

10 kΩ

20 kΩ

24 

kΩ

4.7 µF

4.7 µF

1 µF

10 µF

4.7 nF

15 nF

100

µF

330

nF

100

nF

C

L

R

L

R

L

R

t

AMS

delay

time

output 

A+

output 

A−

ON

NR

LOW: NR ON

V

ref

V

CC

= 10 V

MED776

10 V

18 kΩ

20 kΩ

10 kΩ

24 kΩ

270 kΩ

180 kΩ

27 

kΩ

10 µF

10 µF

1 µF

4.7 µF

4.7 µF

15 nF

4.7 nF

100

nF

330

nF

C

L

R

L

R

L

output 

B−

output 

B+

from

microprocessor

HIGH: MUTE OFF

V

ref

AMS

out

EQ 

70 µs

from

microprocessor

LOW: INPUT 1

HIGH: INPUT 2

15

kΩ

15

kΩ

DELAY

TIME

LEVEL

DETECTOR

POWER

SUPPLY

AMS

EQ

NR

HEAD-

SWITCH

MUTE

LOGIC

DOLBY B NR CIRCUIT

DOLBY B NR CIRCUIT

1

23

4

5

6

7

8

910

11

12

13

14

15 16

17

18

20

21

22

23

24

25

26

27

28

29

30

31

32

AMS

PROCESSOR

GND

V

CC

V

ref

TEA0678

EQ

AMP.

EQ

AMP.

PRE

AMP.

PRE

AMP.

Fig.8 Test circuit for channel separation.

1996 Jun 06 16

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

handbook, full pagewidth

19

100

nF

270 kΩ

180 kΩ

10 kΩ

20 kΩ

24 

kΩ

4.7 µF

4.7 µF

1 µF

10 µF

4.7 nF

15 nF

100

µF

330

nF

100

nF

C

L

R

L

R

L

R

t

AMS

delay

time

output 

A+

output 

A−

V

ref

V

CC

= 10 V

5 V

HIGH: AMS ON

18 kΩ

20 kΩ

10 kΩ

24 kΩ

270 kΩ

180 kΩ

27

kΩ

10 µF

10 µF

1 µF

4.7 µF

4.7 µF

15 nF

4.7 nF

100

nF

330

nF

C

L

R

L

R

L

output 

B−

output 

B+

from

microprocessor

HIGH: MUTE OFF

V

ref

AMS

out

EQ 

70 µs

from

microprocessor

LOW: INPUT 1

HIGH: INPUT 2

15

kΩ

15

kΩ

DELAY

TIME

LEVEL

DETECTOR

POWER

SUPPLY

AMS

EQ

NR

HEAD-

SWITCH

MUTE

LOGIC

DOLBY B NR CIRCUIT

DOLBY B NR CIRCUIT

1

23

4

5

6

7

8

910

11

12

13

14

MED777

15 16

17

voltage

input

18

20

21

22
23

24

25

26

27

28

29

30

31

32

AMS

PROCESSOR

GND

V

CC

V

ref

TEA0678

EQ

AMP.

EQ

AMP.

PRE

AMP.

PRE

AMP.

Fig.9 Test circuit for AMS threshold level.

1996 Jun 06 17

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

handbook, full pagewidth

MED778

15

kΩ

15

kΩ

270 kΩ

180 kΩ

10 kΩ

20 kΩ

24 

kΩ

18 kΩ

20 kΩ

10 kΩ

25 kΩ

25 kΩ

24 kΩ

270 kΩ

180 kΩ

27

kΩ

4.7 µF

4.7 µF

1 µF

10 µF

10 µF

10 µF

10 µF

1 µF

4.7 µF

4.7 µF

4.7 nF

15 nF

15 nF

200

Ω

100

µF

10

µF

100

nF

330

nF

100

nF

100

nF

470

pF

4.7

nF

330

nF

DELAY

TIME

LEVEL

DETECTOR

POWER

SUPPLY

AMS

EQ

NR

HEAD-

SWITCH

MUTE

HEAD

LOGIC

DOLBY B NR CIRCUIT

DOLBY B NR CIRCUIT

1

23

4

5

6

7

8

910

11

12

13

14

15 16

17

18

1920

21

22
23

24

25

26

27

28

29

30

31

32

C

L

R

L

R

L

C

L

R

L

R

L

output 

B−

output 

B+

from

microprocessor

HIGH: MUTE OFF

V

ref

TP

AMS

out

EQ 

70 µs

V

CC

V

i

from

microprocessor

LOW: INPUT 1

HIGH: INPUT 2

R

t

AMS

delay

time

output 

A+

output 

A−

ON

NR

LOW: NR ON

V

ref

V

CC

= 10 V

10 V

V

i

AMS

PROCESSOR

GND

V

CC

V

ref

TEA0678

EQ

AMP.

EQ

AMP.

PRE

AMP.

PRE

AMP.

TP

Fig.10 Test circuit for frequency response (channel B, encode mode).

1996 Jun 06 18

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

ndbook, full pagewidth

19

100

nF

270 kΩ

180 kΩ

10 kΩ

20 kΩ

68 kΩ

24 

kΩ

4.7

µF

4.7

µF

4.7 nF

15 nF

100

µF

330

nF

100

nF

10 Ω

40 Ω

AMS

delay

time

V

CC

= 10 V

MBH478

20 kΩ

10 kΩ

24 kΩ

270 kΩ

180 kΩ

27 

kΩ

5 kΩ

V

CC

5 kΩ

10 µF

15 nF

4.7 nF

100

nF

330

nF

V

ref

200

Ω

470

pF

200

Ω

470

pF

200

Ω

470

pF

15

kΩ

15

kΩ

DELAY

TIME

LEVEL

DETECTOR

4.7

µF

4.7

µF

POWER

SUPPLY

200

Ω

470

pF

AMS

EQ

NR

HEAD-

SWITCH

MUTE

LOGIC

DOLBY B NR CIRCUIT

DOLBY B NR CIRCUIT

1

23

4

5

6

7

8

910

11

12

13

14

15 16

17

18

20

21

22

23

24

25

26

27

28

29

30

31

32

AMS

PROCESSOR

GND

V

CC

V

ref

TEA0678

EQ

AMP.

EQ

AMP.

PRE

AMP.

PRE

AMP.

Fig.11 EMC test circuit.

1996 Jun 06 19

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

LAYOUT OF PRINTED-CIRCUIT BOARD FOR EMC TEST CIRCUIT (FOR TEA0678T)

Fig.12 Top side with components.

Dimensions in mm.

pagewidth

MBH462


68

72

40 Ω

470 pF

10 Ω

200 Ω

0 Ω
0 Ω

0 Ω
0 Ω

470 pF
200 Ω

270
kΩ

270
kΩ

27 kΩ
5 kΩ5 kΩ

20
kΩ

20
kΩ

10 kΩ

470 pF

200 Ω

470 pF

200 Ω
10 kΩ

68 kΩ
15 nF15 nF

4.7 nF4.7 nF
100 nF100 nF

100 nF

TEA0678T

1996 Jun 06 20

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

Fig.13 Bottom side with components.

pagewidth

MBH461


72

68

X5

X4

X3

MP

MP

MP

MP

MP

MP

MP

4.7 µF

100 µF

100 µF

4.7 µF 4.7 µF

180 kΩ

180 kΩ

24 kΩ

24 kΩ

4.7 µF

X2

X1 S1

X5

330 nF

330 nF

Dimensions in mm.

1996 Jun 06 21

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

PACKAGE OUTLINES

UNIT b

1

cEe M

H

L

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC JEDEC EIAJ

mm

DIMENSIONS (mm are the original dimensions)

SOT232-1

92-11-17
95-02-04

b

max.

w

M

E

e

1

1.3

0.8

0.53

0.40

0.32

0.23

29.4

28.5

9.1

8.7

3.2

2.8

0.181.778 10.16

10.7

10.2

12.2

10.5

1.6

4.7 0.51 3.8

M

H

c

(e )

1

M

E

A

L

seating plane

A

1

w M

b

1

e

D

A

2

Z

32

1

17

16

b

E

pin 1 index

0 5 10 mm

scale

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

(1) (1)

D

(1)

Z

A

max.

12

A

min.

A

max.

SDIP32: plastic shrink dual in-line package; 32 leads (400 mil)

SOT232-1

1996 Jun 06 22

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

UNIT

A

max.

A

1

A

2

A3b

p

cD

(1)E(1)

eHELLpQZywv θ

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC JEDEC EIAJ

mm

inches

2.65

0.10

0.25

0.01

1.4

0.055

0.3

0.1

2.45

2.25

0.49

0.36

0.27

0.18

20.7

20.3

7.6

7.4

1.27

10.65

10.00

1.2

1.0

0.95

0.55

8
0

o
o

0.25 0.1

0.004

0.25

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

Note

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

1.1

0.4

SOT287-1

92-11-17
95-01-25

(1)

0.012

0.004

0.096

0.086

0.02

0.01

0.050

0.047

0.039

0.42

0.39

0.30

0.29

0.81

0.80

0.011

0.007

0.037

0.022

0.010.01

0.043

0.016

w M

b

p

D

H

E

Z

e

c

v M

A

X

A

y

32

17

16

1

θ

A

A

1

A

2

L

p

Q

detail X

L

(A )

3

E

pin 1 index

0 5 10 mm

scale

SO32: plastic small outline package; 32 leads; body width 7.5 mm

SOT287-1

1996 Jun 06 23

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

SOLDERING
Introduction

There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.

This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our

“IC Package Databook”

(order code 9398 652 90011).

SDIP

S

OLDERING BY DIPPING OR BY WA VE

The maximum permissible temperature of the solder is
260 °C; solder at this temperature must not be in contact
with the joint for more than 5 seconds. The total contact
time of successive solder waves must not exceed
5 seconds.

The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified maximum storage temperature (T

stg max

). If the
printed-circuit board has been pre-heated, forced cooling
may be necessary immediately after soldering to keep the
temperature within the permissible limit.

R

EPAIRING SOLDERED JOINTS

Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, below the seating plane or not
more than 2 mm above it. If the temperature of the
soldering iron bit is less than 300 °C it may remain in
contact for up to 10 seconds. If the bit temperature is
between 300 and 400 °C, contact may be up to 5 seconds.

SO

REFLOW SOLDERING
Reflow soldering techniques are suitable for all SO

packages.
Reflow soldering requires solder paste (a suspension of

fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.

Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250 °C.

Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45 °C.

W

AVE SOLDERING

Wave soldering techniques can be used for all SO
packages if the following conditions are observed:

• A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.

• The longitudinal axis of the package footprint must be
parallel to the solder flow.

• The package footprint must incorporate solder thieves at
the downstream end.

During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.

Maximum permissible solder temperature is 260 °C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150 °C within
6 seconds. Typical dwell time is 4 seconds at 250 °C.

A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.

R

EPAIRING SOLDERED JOINTS

Fix the component by first soldering two diagonally­opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300 °C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320 °C.

1996 Jun 06 24

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit, automatic
music search, with differential outputs and mute

TEA0678

DEFINITIONS

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.

Data sheet status

Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the specification.

1996 Jun 06 25

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit,
automatic music search, with differential

TEA0678

NOTES

1996 Jun 06 26

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit,
automatic music search, with differential

TEA0678

NOTES

1996 Jun 06 27

Philips Semiconductors Preliminary specification

Dual Dolby* B-type noise reduction circuit,
automatic music search, with differential

TEA0678

NOTES

Internet: http://www.semiconductors.philips.com/ps/

(1) ADDRESS CONTENT SOURCE July 29, 1996

Philips Semiconductors – a worldwide company

© Philips Electronics N.V. 1996 SCA49
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.

The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.

Netherlands: Postbus 90050, 5600 PB EINDHOVEN, Bldg. VB,
Tel. [phone], Fax. [phone]

New Zealand: 2 Wagener Place, C.P.O. Box 1041, AUCKLAND,
Tel. [phone], Fax. [phone]

Norway: Box 1, Manglerud 0612, OSLO,
Tel. [phone], Fax. [phone]

Philippines: Philips Semiconductors Philippines Inc.,
106 Valero St. Salcedo Village, P.O. Box 2108 MCC, MAKATI,
Metro MANILA, Tel. [phone], Fax. [phone]

Poland: Ul. Lukiska 10, PL 04-123 WARSZAWA,
Tel. [phone], Fax. [phone]

Portugal: see Spain
Romania: see Italy
Russia: Philips Russia, Ul. Usatcheva 35A, 119048 MOSCOW,

Tel. [phone], Fax. [phone]
Singapore: Lorong 1, Toa Payoh, SINGAPORE 1231,

Tel. [phone], Fax. [phone]

Slovakia: see Austria
Slovenia: see Italy
South Africa: S.A. PHILIPS Pty Ltd., 195-215 Main Road Martindale,

2092 JOHANNESBURG, P.O. Box 7430 Johannesburg 2000,
Tel. [phone], Fax. [phone]

South America: Rua do Rocio 220 - 5th floor, Suite 51,
CEP: 04552-903-SÃO PAULO-SP, Brazil, P.O. Box 7383 (01064-970),
Tel. [phone], Fax. [phone]

Spain: Balmes 22, 08007 BARCELONA,
Tel. [phone], Fax. [phone]

Sweden: Kottbygatan 7, Akalla, S-16485 STOCKHOLM,
Tel. [phone], Fax. [phone]

Switzerland: Allmendstrasse 140, CH-8027 ZÜRICH,
Tel. [phone], Fax. [phone]

Taiwan: PHILIPS TAIWAN Ltd., 23-30F, 66,
Chung Hsiao West Road, Sec. 1, P.O. Box 22978,
TAIPEI 100, Tel. [phone], Fax. [phone]

Thailand: PHILIPS ELECTRONICS (THAILAND) Ltd.,
209/2 Sanpavuth-Bangna Road Prakanong, BANGKOK 10260,
Tel. [phone], Fax. [phone]

Turkey: Talatpasa Cad. No. 5, 80640 GÜLTEPE/ISTANBUL,
Tel. [phone], Fax. [phone]

Ukraine: PHILIPS UKRAINE, 2A Akademika Koroleva str., Office 165,
252148 KIEV, Tel. [phone]/1642, Fax. [phone]

United Kingdom: Philips Semiconductors Ltd., 276 Bath Road, Hayes,
MIDDLESEX UB3 5BX, Tel. [phone], Fax. [phone]

United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409,
Tel. [phone], Fax. [phone]

Uruguay: see South America
Vietnam: see Singapore
Yugoslavia: PHILIPS, Trg N. Pasica 5/v, 11000 BEOGRAD,

Tel. [phone], Fax.[phone]

For all other countries apply to: Philips Semiconductors, Marketing & Sales Communications,
Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. [phone]

Argentina: see South America
Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113,

Tel. [phone], Fax. [phone]
Austria: Computerstr. 6, A-1101 WIEN, P.O. Box 213,

Tel. [phone], Fax. [phone]
Belarus: Hotel Minsk Business Center, Bld. 3, r. 1211, Volodarski Str. 6,

220050 MINSK, Tel. [phone], Fax. [phone]

Belgium: see The Netherlands
Brazil: see South America
Bulgaria: Philips Bulgaria Ltd., Energoproject, 15thfloor,

51 James Bourchier Blvd., 1407 SOFIA,
Tel. [phone], Fax. [phone]

Canada: PHILIPS SEMICONDUCTORS/COMPONENTS,
Tel. [phone], Fax. [phone]

China/Hong Kong: 501 Hong Kong Industrial Technology Centre,
72 Tat Chee Avenue, Kowloon Tong, HONG KONG,
Tel. [phone], Fax. [phone]

Colombia: see South America
Czech Republic: see Austria
Denmark: Prags Boulevard 80, PB 1919, DK-2300 COPENHAGEN S,

Tel. [phone], Fax. [phone]
Finland: Sinikalliontie 3, FIN-02630 ESPOO,

Tel. [phone], Fax. [phone]
France: 4 Rue du Port-aux-Vins, BP317, 92156 SURESNES Cedex,

Tel. [phone], Fax. [phone]
Germany: Hammerbrookstraße 69, D-20097 HAMBURG,

Tel. [phone], Fax. [phone]
Greece: No. 15, 25th March Street, GR 17778 TAVROS,

Tel. [phone], Fax. [phone]

Hungary: see Austria
India: Philips INDIA Ltd, Shivsagar Estate, A Block, Dr. Annie Besant Rd.

Worli, MUMBAI 400 018, Tel. [phone], Fax. [phone]

Indonesia: see Singapore
Ireland: Newstead, Clonskeagh, DUBLIN 14,

Tel. [phone], Fax. [phone]
Israel: RAPAC Electronics, 7 Kehilat Saloniki St, TEL AVIV 61180,

Tel. [phone], Fax. [phone]
Italy: PHILIPS SEMICONDUCTORS, Piazza IV Novembre 3,

20124 MILANO, Tel. [phone], Fax. [phone]
Japan: Philips Bldg 13-37, Kohnan 2-chome, Minato-ku, TOKYO 108,

Tel. [phone], Fax. [phone]
Korea: Philips House, 260-199 Itaewon-dong, Yongsan-ku, SEOUL,

Tel. [phone], Fax. [phone]
Malaysia: No. 76 Jalan Universiti, 46200 PETALING JAYA, SELANGOR,

Tel. [phone], Fax. [phone]
Mexico: 5900 Gateway East, Suite 200, EL PASO, TEXAS 79905,

Tel. [phone], Fax. [phone]
Middle East: see Italy

Printed in The Netherlands 517021/1200/02/pp28 Date of release: 1996 Jun 06 Document order number: 9397 750 00896