SA7496 Просмотр технического описания (PDF) - Silan Microelectronics
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SA7496 Datasheet PDF : 9 Pages
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SA7496L
(Continued)
Pin No.
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin name
INL
VAROUT_L
VOLUME
VAROUT_R
NC
INR
SVR
STBY
MUTE
GND
OUTR
VCC
VCC
OUTL
GND
GND
GND
Left input
Left output_1
Volume control
Left output_2
Not connect
Right input
Supply voltage rejection
Stand by pin
MUTE pin
Ground
Right output
Supply voltage
Supply voltage
Left output
Ground
Ground
Ground
Description
FUNCTION DESCRIPTION
The SA7496L is a semiconductor integrated circuit consisting of two channel power amplifiers, which is a
stereo class AB power amplifier, specially designed for high quality sound, TV applications, which include linear
volume control, stand-by and mute functions.
There are the MUTE and STAND-BY turn on and off conversion circuit in order to eliminate the plops noise.
When the both voltages are low and the operation will be normal. While the STAND-BY is high, the circuit will
turn off the bias current, so it will be the stand-by state. Also when the STAND-BY is low and the MUTE is high,
the circuit will be the mute state, in this operation, the bias current of the signal channels will be shutdown.
The SA7469L built-in a DC volume control circuit. While the voltage of pin6 is 0, the output voltage will be 0;
and the gain will be increased as the pin6’s voltages go up.
In this circuit, as the operation temperature’s increase, the transistor’s threshold limit value will decrease, when
the temperature up to 150 °C, the thermal protection circuit will turn on and the signal channel will be shutdown.
MUTE & STAND-BY TRUTH TABLE
MUTE
ST-BY
Operating State
H
H
STANDBY
L
H
STANDBY
H
L
MUTE
L
L
PLAY
Note: “H”denotes the voltage is larger than 3.5V, and “L”denotes the voltage is lower than 1.5V.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2 2006.12.31
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