TEA7532 ST Microelectronics, Inc., TEA7532 Datasheet - Page 12

• Manufacturer Part Number: TEA7532
• Description: Monitor Amplifier With Anti-larsen Function And Adjustment (full Duplex)
• Manufacturer: ST Microelectronics, Inc.

TEA7532
PIN 5/6 : MICROPHONE INPUTS
These are used for antilarsen control.
PIN 7 : ANTILARSEN FILTER 1
The second filter of the antilarsen system (1 st filter
: pins 5-6) is formed by the RC network R5C5.
In order to obtain a second order filter for the anti-
larsen system, the cut-off frequency defined at this
pin, should be the same as that chosen for the first
filter.
For correct TEA7532 operation R6 and R5 should
be fixed at 10 k and 1 k respectively.
PIN 8 : ANTILARSEN FILTER 2
The gain and the response of the antilarsen system
can be adjusted respectively by the resistor and the
capacitor on this pin, according to the acoustic char-
acteristics of the telephone set.
The value of the resistor should not exceed 390 k .
When the voltage on this pin exceeds the threshold
voltage of 0.4 V, the AGC system is enabled.
Figure 21.
Figure 22.
12/16
PIN 9 : EARPHONE INPUT
Input for loudspeaker signal.
PIN 10-12 : LOUDSPEAKER OUTPUTS
Maximum output voltage : V
a gain of 32 dB).
Maximum output current : depending of the supply
current.
Two loudspeaker connection methods are possible,
using the amplifier in either "H" mode or "B" mode.
Note : It is advisable to connect a 47 nF capacitor
- "H" Mode
This is for low voltage working, but at a higher supply
current. The highest output power is available in this
mode, due to the 5.5 V maximum supply voltage re-
striction, imposed by the TEA7532.
Loudspeaker impedance recommended value : 50 .
Maximum gain available between earphone input
and loudspeaker output : 32 dB.
in parallel with the loudspeaker (between
pins 10 and 12).
pp
= 2 V
LS
- 2.5 V (with