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AN12972A Datasheet

Download or read online Panasonic Corporation AN12972A Audio Amplifier, Audio Power Amplifier with Built-in AGC pdf datasheet.



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Helping to increase average speaker volume levels
Audio Power Amplifier with Built-in AGC AN12972A
Overview
Increasing volume settings when using small speakers
results in distortion as the output signal distorts at high
gain settings. The AN12972A audio power amplifier
features built-in automatic gain control (AGC) circuitry
to minimize distortion by decreasing too high an input
gain level. Using a low-noise amp minimizes noise even
when the speaker is placed close to an ear.
Features
Built-in AGC circuitry if an input level is too high, the
AGC is activated to minimize distortion, raising the
overall volume level and reducing noise.
Low noise amplifier.
Input circuit format accommodates different input
signals (mixing possible)
Standby and speaker mute functions.
Small package.
Applications
Cellular phones, PDAs and other mobile equipment
Application circuit
4.7µF
100kΩ
0.47µF
1µF
-SP
V
CC
V
CC
OFF
ON
SP Mute
Switch
Products and specifications are subject to change without notice. Please ask for the latest Product Standards to guarantee the satisfaction of your product requirements.
1 Kotari-yakemachi, Nagaokakyo, Kyoto 617-8520, Japan
M00618AE
330pF
22kΩ
0.47µF
10kΩ
12
11
10
9
Gain Adjust
13
8
AGC
14
7
Mute
15
6
16
Standby
5
BTL Amp.
Switch
1
2
3
4
Tel. +81-75-951-8151
New
Unit : mm
QFN016-P-0304B
V
CC
AGC
Switch
ON
OFF
10kΩ 0.47µF
IN1
10kΩ 0.47µF
IN2
10kΩ 0.47µF
IN3
V
CC
1µF
V
CC
Standby
OFF
Switch
ON
http://panasonic.co.jp/semicon
New publication, effective from 31 Oct. 2003

Summary of Contents

Page 1

... Overview Increasing volume settings when using small speakers results in distortion as the output signal distorts at high gain settings. The AN12972A audio power amplifier features built-in automatic gain control (AGC) circuitry to minimize distortion by decreasing too high an input gain level. Using a low-noise amp minimizes noise even when the speaker is placed close to an ear ...

Page 2

AGC Function AGC's ON level changes in conjunction with Vcc SP value. Output range expands when VccSP is raised without clipping. Output Power (AGC ON) Output power (AGCON) 700 600 500 400 300 200 100 2.5 2.8 3.1 3.4 3.7 ...

Page 3

Electrical Characteristics Parameter Circuit current V STBOFF,SPON At non-signal ( Circuit current STBOFF,SPON At non-signal (V -SP) CC Circuit current V STBON,SPOFF At STB mode ( Circuit current V STBON,SPOFF At STB mode (V -SP) ...

Page 4

Amplifier output Achieving a big sound volume without clipping distortion by small speakers. Without AGC With AGC function Record output wave patterns by inputting same signals with 2 amplifiers. Average sound volume cannot be big without AGC (wave patters clips ...

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