|
|
TEA7530FPのメーカーはST Microelectronicsです、この部品の機能は「MONITOR AMPLIFIER」です。 |
部品番号 | TEA7530FP |
| |
部品説明 | MONITOR AMPLIFIER | ||
メーカ | ST Microelectronics | ||
ロゴ | |||
このページの下部にプレビューとTEA7530FPダウンロード(pdfファイル)リンクがあります。 Total 11 pages
LOW VOLTAGE
POWER: 100mW AT 5V
ANTIDISTORTION SYSTEM FOR LOW CUR-
RENT LINES
DESCRIPTION
This 8 pins IC is designed for monitor telephone
set and provides:
a) Signal amplification for monitoring
b) Antidistortion by automatic gain adaptation.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Top Temperature Range
VLS Supply Voltage
ILS Supply Current for T > 300ms
for T ≤ 300ms
BLOCK DIAGRAM
TEA7530
MONITOR AMPLIFIER
PRELIMINARY DATA
MINIDIP
SO-8
ORDERING NUMBERS:
TEA7530DP
TEA7530FP
Value
Minidip
SO
-20 to +70 -20 to +70
66
90 75
150 120
Unit
°C
V
mA
mA
June 1993
1/11
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1 Page Figure 1: Loudspeaker Gain vs. Voltage on Pin 2
TEA7530
Figure 2: Power Available on Loudspeakervs.
VLS Typical Curve. (Voltage Mode
Figure 3: Distortion vs. Output Power
Figure 4: Output Power vs. Supply Current
(Current Mode Supply)
3/11
3Pages TEA7530
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
Figure 11
connected to ground with an external resistor
(Rext) higher than 16KΩ. The typical value of VLS
is :
VLS
The
=A1G.2CVs4e0c.t5ioK(nΩ2is7+Kw(Ωo2⁄r7k⁄KiRnΩEgX⁄ aT⁄ sR) EdXeTs)c.ribed
in
the
previous paragraph.
b) Voltage MODE - Pin 8 is shorted or connected
to GND with a resistor (REXT) lower than 16KΩ. 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.
6/11
6 Page | |||
ページ | 合計 : 11 ページ | ||
|
PDF ダウンロード | [ TEA7530FP データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
TEA7530FP | MONITOR AMPLIFIER | ST Microelectronics |