SGS Thomson Microelectronics TEA7532FP, TEA7532DP Datasheet

.PROGRAMMABLEGAININ STEPSOF6 dB

.ON/OFFPOSITION

.LOWVOLTAGE

.POWER: 100 mWAT 5 V

DESCRIP TION

This16 pinsIC is designedfor monitor
(loudspeaker)telephoneset andprovides:

a) Signalamplificationformonitoring(loudspeaker)
b) Antiacousticfeedback(antilarsen)
c)Antidistortionbyautomaticgainadaptation
d) Antilarsenadjustment(full duplex)

BLOCK DI AG RAM

TEA7532

MONITOR AMPLIFIER

DIP 16

ORDERING NUMBERS : TEA7532DP(DIP16)

SO16

TEA7532FP(SO16)

July1993

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TEA7532

PIN CONNECTI O N (Top view)

PIN DESCRIPTION

N° Symbol Description

1 ADJ Adjust Internal Reference V

LS

2 ALADJ Antilarsen Adjustement
3 ADS Antidistortion
4V

LS

Supply
5 MIC1 Microphone Input
6 MIC2 Microphone input
7 FAL Antilarsen Filter
8 TC1 Antilarsen Time Constant
9 INP Input Signal

10 LS1 Output Loudspeaker 1
11 V

REF

Internal Resistance

12 LS2 Output Loudspeaker 2
13 GND Ground
14

15
16

PG0
PG1

ON/OFF

Inputs Program Level to Loudspeaker

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

T

op

V

LS

I

LS

V

Temperature Range –5 to + 45 °C
Supply Voltage 6 V
Supply Current for T > 300ms

for T ≤ 300ms

Voltage Level (pins, PG0, PG1, on/off) 0.6 > to VS+ 0.6 V

L

90

150

mA
mA

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TEA7532

ELECTRICAL CHARACTERISTICS (T

=25oC, ILS= 30mA unless otherwisespecified)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

LS1

V

LSM

V

ADJ

G

G000
G001
G010
G011
G100

VLSSupply ILS= 2mA (fig. 7)

= 30mA (fig. 7)

I

LS

VLSMaximum I

=50µA (fig. 7 ; So = closed) 5.5 V

pin 1

Voltage Pin 1 ILS= 2mA to 30mA (fig. 7) 1.1 1.25 1.4 V

V

− V

10

Loudspeaker Amplifier Gain =

12

V

ON/OFF PG0 PG1

9

GND
GND
GND
GND

V

LS

GND
GND

V

LS

V

LS

X

GND

V

LS

GND

V

LS

X

2.6 3.0

12
18
24
30

THD Distortion f = 300Hz to 2kHz,

V

10–V12

G = G011, (fig. 8)

G2 [V(10) – V(12)]/V2 P

Z

MICIN

Z

INPIN

Z

V

OFFS

I

ON/OFF

I

PG0

I

PG1

I

ON/OFF

I

PG0

I

PG1

V

IL ON/OFF

V

IL PG0

V

IL PG1

V

IH ON/OFF

V

IH PG0

V

IH PG1

G

Microphone Input Symetrical at (pins 5-6)

Earphone Input (fig. 9) 2.2 2.8 3.4 kΩ
Antilarsen Adjustment Input 1 1.2 1.45 kΩ

IN2

Ouput Offset
[V

(10)–V(12)

]

Input Current ON State V

Input Current OFF State V

Input Voltage ON State 0.45

Input Voltage OFF State 1.5

Microphone Gain = V

MIC

(7)

/[V

(5)–V(6)

]

Vg Voltage Pin 8 0.48 0.67 0.75 V

G

Loudspeaker Attenuated

ATT

Gain = [V

(10)–V(12)

]/V

(9)

G0=PG1=VLS,V8

Asymetrical at (pin 6) fig. 9

G011 ; (fig. 8) – 50 50 mV

PG1

PG1=VLS

V

MIC

G011 ; V8= 0.6V ; (fig. 10)
G011 ; V

= 0.8V

= 0V ; (fig. 8) – 10

; (fig.8) 1

= 10mV

= 0.4V ; (fig. 10) 20

8

,

RMS

= 0.8V (fig. 8) 30 32 34 dB

–10
–10

1.5

1.5

, f = 2kHz (fig. 10)

RMS

22.5 23.5 24.5 dB

3.4

3.15

3.4VV

14

16

20

22

26

28

32

–30

34

–20

2%

4.5 kΩ

–5
–5
–5

1
1

0.45

0.45

–3030–20 dB

dB
dB
dB
dB
dB

µA
µA
µA

µA
µA
µA

V
V
V

V
V
V

dB

FUNCTIO NAL DESCRIPTI ON

TEA7532performs the followingfunctions:
Thecircuitamplifiesthe incomingsignaland feeds
itto the loudspeaker.PG0andPG1 inputsare used
to set the loudspeakergain in a range of 32dB to
14dBin 6dB steps.
The TEA7532inputs (PG0, PG1, ON/OFF) permit
the loudspeakertobe cut-offthus ensuringprivacy
of communication.

- The antilarsen (antiacousticfeedback)system is
incorporated.

- The maximum power available on a 50Ω imped­anceloudspeakeris25mWat3 volts and 100mW
at 5V.

Limitvaluesfor externalcomponents:
R3 min = 5 kΩ (R3 adjustVLS),R7 max= 390 kΩ,
R6 min = R7/35
Rmaxbetweenpin5 and6=10kΩ+C min= 10nF.

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TEA7532

Figure 1 : LoudspeakerGain VersusVoltage on

Pin(3) - (8) with Pin2 Open.

(*) ATTENUATION =

Zin2(1.2 K) R2=10K⇒ATT = 20 dB

Zin2(1.2 K) + R2(EX T) R2=3 K⇒ATT ≈ 10 dB

Figure 3 : ACOutput VoltageVersusAmplifier

Gain.

Figure2 :LoudspeakerGain VersusVoltageon

Pin(3) - (8)and VersusR

.(*)

2

Figure4 : Power Availableon Loudspeaker

VersusV

Typical Curve.

LS

Figure 5 : DistortionVersus Output Power. Figure6 : OutputPowerVersusSupplyCurrent.

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TEST CIRCUI TS
Figure 7 : ShuntvoltageRegulator/Reference

Voltageat Pin 1.

TEA7532

Figure8 : LoudspeakerAmplifier :Gain/Distor

tion/OutputOffset.

S1 S2 S3

G1XX 1 X X

G000 0 0 0
G010 0 1 0
G001 0 0 1

Note : S0 open for VLS 1

S0 close for VLSM.

Figure 9 : ImpedanceZMIC, ZINP andZin2.

V (10)– V (12) V

• G= =

• VOFFS with Vin = 0.

V

LS

G

ND

V (9) V (9)

=1

=0

out

Figure10 : AntiacousticFeedbackSystem at

G011.

Zmic = ; Zinp = ; Zin2 =

1.1V 1.1V 1.1V
I6 I9 I2

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