TEA7532DP datasheet(3/16 Pages) STMICROELECTRONICS

3 / 16 page

FUNCTIONAL DESCRIPTION

TEA7532 performs the following functions :

The circuit amplifies the incoming signal and feeds

it to the loudspeaker. PG0 and PG1 inputs are used

to set the loudspeaker gain in a range of 32dB to

14dB in 6dB steps.

The TEA7532 inputs (PG0, PG1, ON/OFF) permit

the loudspeaker to be cut-off thus ensuring privacy

of communication.

- The antilarsen (antiacoustic feedback) system is

incorporated.

- The maximum power available on a 50

Ω imped-

ance loudspeaker is 25mW at 3 volts and 100mW

at 5V.

Limit values for external components :

R3 min = 5 k

Ω (R3 adjust VLS), R7 max = 390 kΩ,

R6 min = R7/35

R max between pin 5 and 6 = 10k

Ω +C min = 10nF.

ELECTRICAL CHARACTERISTICS (Tamb =25

oC, ILS = 30mA unless otherwise specified)

Symbol

Parameter

Test Conditions

Min.

Typ. Max.

Unit

VLS1

VLS Supply

ILS = 2mA (fig. 7)

ILS = 30mA (fig. 7)

2.6

3.0

3.15

3.4

VLSM

VLS Maximum

Ipin 1 =50

µA (fig. 7 ; So = closed)

5.5

VADJ

Voltage Pin 1

ILS = 2mA to 30mA (fig. 7)

1.1

1.25

1.4

Loudspeaker Amplifier Gain =

V10 − V12

ON/OFF

PG0

PG1

G000

G001

G010

G011

G100

GND

VLS

GND

VLS

GND

VLS

GND

VLS

–30

–20

THD

Distortion

f = 300Hz to 2kHz,

V10 –V12 = 0.8VRMS,

G = G011, (fig. 8)

[V(10) – V(12)]/V2

PG0 =PG1 =VLS,V8 = 0.8V (fig. 8)

ZMICIN

Microphone Input

Symetrical at (pins 5-6)

Asymetrical at (pin 6) fig. 9

4.5

Ω

ZINPIN

Earphone Input

(fig. 9)

2.2

2.8

3.4

Ω

ZIN2

Antilarsen Adjustment Input

1.2

1.45

Ω

VOFFS

Ouput Offset

[V(10) –V(12)]

G011 ; (fig. 8)

– 50

ION/OFF

IPG0

IPG1

Input Current ON State

VPG1 = 0V ; (fig. 8)

– 10

–10

–5

µA

ION/OFF

IPG0

IPG1

Input Current OFF State

VPG1 =VLS ; (fig. 8)

µA

VIL ON/OFF

VIL PG0

VIL PG1

Input Voltage ON State

0.45

VIH ON/OFF

VIH PG0

VIH PG1

Input Voltage OFF State

1.5

GMIC

Microphone Gain = V(7)/[V(5) –V(6)]

VMIC = 10mVRMS, f = 2kHz (fig. 10)

22.5

23.5

24.5

Voltage Pin 8

0.48

0.67

0.75

GATT

Loudspeaker Attenuated

Gain = [V(10) –V(12)]/V(9)

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

G011 ; V8 = 0.4V ; (fig. 10)

–30

–20

TEA7532

3/16

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