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TEA7530 Folha de dados(PDF) 6 Page - STMicroelectronics

Nome de Peças TEA7530
Descrição Electrónicos  MONITOR AMPLIFIER
Download  11 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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TEA7530 Folha de dados(HTML) 6 Page - STMicroelectronics

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Amplifier DC Supply
In transmission mode, the supply voltage is con-
trolled by the internal shunt DC regulator. For this
reason, the TEA7530 should be supplied from a
current source (see: supply considerations).
An antidistortion system is embodied which pro-
vides AGC control to avoid loudspeaker distortion
under current-limited conditions.
AGC Circuit action
When the supply VLS is insufficient, the voltage at
pin 8, falls below the reference voltage 1.2V, re-
sulting in transistor (TR) being switched off, re-
sulting zero current flow in resistor R. This state
enables the gain control system. Under these
conditions, the shunt DC supply will switch at a
rate determined by the time constant of the RC
network on pin 2.
This
switching
action
accomodates
normal
speech characteristic under low supply condi-
tions.
The AGC will be switched ON when the level on
Pin 2 is greater than a reference voltage of 0.4V.
Supply Considerations
a) Current MODE - Pin 8 is open (VLS =VLS1)or
connected to ground with an external resistor
(Rext) higher than 16K
Ω. The typical value of VLS
is :
VLS = 1.2V
40.5K
Ω+( 27K
⁄ REXT )
( 27KΩ ⁄⁄ REXT )
.
The AGC section is working as described in the
previous paragraph.
b) Voltage MODE - Pin 8 is shorted or connected
to GND with a resistor (REXT) lower than 16K
Ω.In
this condition the circuit must be supplied with a
DC voltage of 3 to 5.5V. In this case the AGC
section is permanently ON. Pin 2 must be shorted
to GND (in voltage mode only) to avoid perma-
nent attenuation of the signal at audio input
PIN FUNCTIONS
PIN 1: GND.
PIN 2: AUTOMATIC GAIN CONTROL FILTER
The antidistortion system response is adjusted by
the R-C network on this pin.
The AGC will be switched ON when the level on
pin 2 is greater than a reference voltage of 0.4V,
the RC-network charges (current source ON) or
discharges (current source OFF) according to
supply voltage.
Figure 11
TEA7530
6/11


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