TEA7532-TEA7532DP-TEA7532FP Fast Delivery |IC PHOENIX CO.,LIMITED

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TEA7532-TEA7532DP-TEA7532FP
MONITOR AMPLIFIER
TEA7532
MONITOR AMPLIFIER PROGRAMMABLE GAININ STEPS OF6 dB. ON/OFF POSITION. LOW VOLTAGE. POWER: 100 mW AT5V
DESCRIPTION
This16 pinsICis designedfor monitor
(loudspeaker) telephoneset and provides: Signal amplificationfor monitoring (loudspeaker) Antiacoustic feedback(antilarsen) Antidistortionby automatic gain adaptation Antilarsen adjustment (full duplex)
DIP16 SO16
ORDERING NUMBERS: TEA7532DP (DIP16)
TEA7532FP (SO16)
BLOCK DIAGRAM
PIN DESCRIPTION Symbol Description ADJ Adjust Internal Reference VLS ALADJ Antilarsen Adjustement ADS Antidistortion
4VLS Supply MIC1 Microphone Input MIC2 Microphone input FAL Antilarsen Filter TC1 Antilarsen Time Constant INP Input Signal LS1 Output Loudspeaker1 VREF Internal Resistance LS2 Output Loudspeaker2 GND Ground
PG0
PG1
ON/OFF
Inputs Program Levelto Loudspeaker
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Top Temperature Range –5to+45 °C
VLS Supply Voltage 6 V
ILS Supply Current forT> 300ms
forT≤ 300ms
TEA7532
FUNCTIONAL DESCRIPTION
TEA7532 performs the following functions:
The circuit amplifies the incoming signal and feeds
itto the loudspeaker.PG0 and PG1 inputs are used set the loudspeaker gainina rangeof 32dBto
14dBin 6dB steps.
The TEA7532 inputs (PG0, PG1, ON/OFF) permit
the loudspeakertobe cut-off thus ensuring privacy communication. The antilarsen (antiacoustic feedback) systemis
incorporated. The maximum power availableona 50Ω imped-
ance loudspeakeris 25mWat3 volts and 100mW 5V.
Limit valuesfor external components: min=5 kΩ (R3 adjust VLS), R7 max= 390 kΩ, min= R7/35 maxbetweenpin5 and6= 10kΩ +C min= 10nF.
ELECTRICAL CHARACTERISTICS (Tamb =25oC, 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
VLSM VLS Maximum Ipin1 =50μA (fig.7;So= closed) 5.5 V
VADJ Voltage Pin1 ILS= 2mAto 30mA (fig.7) 1.1 1.25 1.4 V Loudspeaker Amplifier Gain= V10− V12 ON/OFF PG0 PG1
G000
G001
G010
G011
G100
GND
GND
GND
GND
VLS
GND
GND
VLS
VLS
GND
VLS
GND
VLS
THD Distortion f= 300Hzto 2kHz,
V10 –V12= 0.8VRMS,= G011, (fig.8) [V(10)– V(12)]/V2 PG0 =PG1 =VLS,V8= 0.8V (fig.8) 30 32 34 dB
ZMICIN Microphone Input Symetricalat (pins 5-6)
Asymetricalat (pin6)fig.9
4.5 kΩ
ZINPIN Earphone Input (fig.9) 2.2 2.8 3.4 kΩ
ZIN2 Antilarsen Adjustment Input 1 1.2 1.45 kΩ
VOFFS Ouput Offset
[V(10) –V(12)]
G011; (fig.8) –50 50 mV
ION/OFF
IPG0
IPG1
Input Current ON State VPG1=0V; (fig.8) –10
–10μA
ION/OFF
IPG0
IPG1
Input Current OFF State VPG1 =VLS; (fig.8) 1μA
VIL ON/OFF
VILPG0
VILPG1
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 dB Voltage Pin8 0.48 0.67 0.75 V
GATT Loudspeaker Attenuated
Gain= [V(10) –V(12)]/V(9)
G011;V8= 0.6V; (fig. 10)
G011;V8= 0.4V; (fig. 10) 20
–20 dB
TEA7532
Figure1: LoudspeakerGain VersusVoltageon
Pin(3)- (8) with Pin2 Open.
Figure3: AC Output Voltage Versus Amplifier
Gain.
Figure4: Power Availableon Loudspeaker
Versus VLS Typical Curve.
Figure2 :LoudspeakerGain Versus Voltageon
Pin (3)- (8) and Versus R2.(*)
Zin2 (1.2K) R2 =10K⇒ ATT=20dB
(*) ATTENUATION=
Zin2 (1.2K)+R2(EXT) R2=3K⇒ ATT≈10dB
Figure5: Distortion Versus Output Power. Figure6: Output Power Versus Supply Current.
TEA7532
TEST CIRCUITS
Figure7: ShuntvoltageRegulator/ Reference
Voltageat Pin1.
Note: S0 openfor VLS1 closefor VLSM.
Figure8: LoudspeakerAmplifier: Gain/Distor
tion/Output Offset. (10)–V (12) Vout• G= =
V(9) V(9) VOFFSwithVin=0.
VLS =1
GND=0
Figure9: ImpedanceZMIC, ZINP and Zin2.
1.1V 1.1V 1.1VZmic= ; Zinp= ; Zin2=
Figure10: Antiacoustic FeedbackSystemat
G011. S2 S3
G1XX 1 X X
G000 0 0 0
G010 0 1 0
G001 0 0 1
TEA7532
CIRCUIT DESCRIPTION
TEA7532isa16 pin DIL integratedcircuit providing
the following facilities: Loudspeaker amplifier Antiacoustic feed-back system
(antilarsen system)
1.1. LOUDSPEAKERAMPLIFIER
Figure 11.
The amplifieris divided into3 main sections. AutomaticGain Control (AGC) Preamplifier Push-pull amplifier (bridge structure) The AGC sectionis used for the antilarsen and
antidistortion system. When used ina telephoneset toavoidlarsenef-
fect the AGC automatically decreases loud-
speaker amplifier gain. When the required output level exceeds the
capabilitiesof the available current, the AGC
decreases the loudspeaker amplifier gainto
avoid distortion. The preamplifier permits step controlof amplifier
gainin stepsof6 dB, using pins PG0 and PG1,
which maybe controlled using switchesor bya mi-
croprocessor.The amplifier maybe muted using the
ON/OFF control signal (pin 16). Theoutput amplifier usesa double push-pullcon-
figuration(Hbridge)to getmaximum dynamicrange
under limited supplyconditions.
Figure 12.
TEA7532
Amplifierdc supply. transmission mode, the supplyvoltageis control-
ledby the internal shunt DC regulator. For this rea-
son,the TEA7532 shouldbesupplied from acurrent
source
(see: supplyconsiderations). antidistortion systemis embodied which pro-
vides AGC controlto avoid loudspeaker distortion
under current-limited conditions.
Figure 13.
Circuit action.
When the supply voltageis insufficient, the voltage pin1, falls below the referencevoltage 1.1V,re-
sultingin transistor(TR) beingswitched off, resulting zero current flowin resistorR. This stateenables
thegaincontrol system.Under these conditions,the
shunt DC supply will switchata rate determinedby
the time constantof theRC networkon pin3.
This switching action accomodatesnormal speech
characteristics under low supply conditions.
1.2. ANTIACOUSTIC FEED-BACK SYSTEM (AN-
TILARSEN SYSTEM)
The purposeof this systemisto control AGC action orderto avoid acoustic feed-back between the
loudspeaker and the microphone, when usedina
telephoneset.
Figure14.
TEA7532
Figure 15.
Principleof operation.
When examining the spectral densityof the voice
area and the larsen area,it canbe seen that the
dominant featuresof each existin different fre-
quencybands. extract the larsen component, the microphone
signalis first filteredbya secondorder filter (formed two first order filters), thenamplified and rectified orderto produce the AGC control signal.
Figure 16.
Zin:4 kΩA= =15
TEA7532

Partno	Mfg	Dc	Qty	Available	Descript
TEA7532		N/a	833	avai	MONITOR AMPLIFIER
TEA7532DP	STM	N/a	83	avai	MONITOR AMPLIFIER
TEA7532FP	ST	N/a	7218	avai	MONITOR AMPLIFIER