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AN12940AA Datasheet

Download or read online Panasonic Corporation AN12940AA Audio Signal Processing IC For Notebook PC pdf datasheet.
Also see for AN12940AA: Datasheet #2 (25 pages)



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ICs for Audio Common Use
AN12940AA
Audio signal processing IC for notebook PC
■ Overview
The AN12940AA is an amplifier IC for stereo speakers which can output 1 W by 8 Ω or 2 W by 4 Ω.
The AGC circuit is built-in to prevent the resonance or the vibration by the speaker's energy and the clipping distortion what
is called "broken up sound." of the speakers.
Also the AN12940AA is built-in power saving on/off function automatically detecting input signal to save the power.
■ Features
• Speaker amplifier is
1 W × 2-ch: 8 Ω,V
= 5 V or
CC
2 W × 2-ch: 4 Ω,V
= 5 V
CC
• Built-in AGC circuit
Prevention of the resonance or the vibration by the speaker's energy and the clipping distortion of the speaker by
AGC at excessive input signal (with AGC on/off switch).
• Built-in automatic power saving function
It detects input signals and switches on/off (with the on/off switch for the automatic power saving).
• Any shock noise free at the automatic power saving operation.
■ Applications
• Notebook PC, LCD monitor with speaker
■ Package
• HSOP056-P-0300A
■ Block Diagram
Publication date: June 2006
AGC
Mix circuit
SDC00044AEB
AGC
Automatic detection
1

Summary of Contents

Page 1

... Audio signal processing IC for notebook PC Overview The AN12940AA is an amplifier IC for stereo speakers which can output Ω Ω. The AGC circuit is built-in to prevent the resonance or the vibration by the speaker's energy and the clipping distortion what is called "broken up sound." of the speakers. ...

Page 2

... AN12940AA Application Circuit Example 10 µF 4 Ω Ω Out-L SP save on/off V AGC-On CC Level change µF V AGC CC on/off 0.47 µF 100 kΩ 1 µF HP amp. L-ch. 0.47 µF 0.47 µF Audio control volume 20 kΩ 22 kΩ 0.47 µF L-ch. in 0.47 µF 4.7 µF Monophonic input 0.47 µF (from modem) Monophonic input (from beep) 0.47 µ ...

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... Volume control signal L-channel input 48 Audio mix amplifier L-channel output 49 V L-channel for volume REF 50 Signal automatic detection mix amplifier output 51 Negative feedback pin for signal automatic detection mix amplifier 52 L-channel input 53 V REF 54 Input for modem 55 GND 56 Input for beep SDC00044AEB AN12940AA Description 3 ...

Page 4

... AN12940AA Absolute Maximum Ratings Parameter 1 Supply voltage Supply current 2 Power dissipation 3 Operating ambient temperature 3 Storage temperature Note The values under the condition the above absolute maximum ratings and the power dissipation 75°C, the value under the condition which this device is mounted on a four-layer printed wiring board and in addition its radiation part is soldered. (Reference to ■ ...

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... kHz THD HPMAL HPMAR 10 dBV, 1 kHz V V OFSPL IN pin 4,6,52,54,56: input OFSPR 10 dBV, 1 kHz V V ARSPL IN pin 2: input ARSPR SDC00044AEB AN12940AA Min Typ Max 8 Ω 2.0 4.0 6 Ω 2.0 4.0 6 Ω 0.04 0 Ω 0.04 0.5 L 74 68  ...

Page 6

... AN12940AA Electrical Characteristics at V (continued) Parameter Signal detection system characteristic (Pin 52, pin 6, pin 54, pin 56, pin 2, pin 4 pin 50) Pre-amplifier output at L-channel input V Pre-amplifier output at R-channel input V Pre-amplifier output at beep signal input Pre-amplifier output at modem signal input Pre-amplifier output at PCcard signal input ...

Page 7

... Low Reference level on V _SP the specifically designed power pin of the speaker amplifier. Because the big electric current flows,it is desirable to separate from the V the board pattern. SDC00044AEB AN12940AA Min Typ Max 0.0 0.5 Open 2.5 5.0 Remarks High ...

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... AN12940AA Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 25 V _SP 3.6 kΩ Speaker Output: Pin 31 output pins of the speaker Pin 32, amplifier. It becomes BTL output. Pin 25, The L-channel positive phase output pin: Pin 26 18 kΩ ...

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... Low: Low sensitivity mode High: High sensitivity mode The output impedance: About 105 kΩ SDC00044AEB AN12940AA Description Corrugation and Voltage Constant current source Emitter follower About 200 Ω (SP): ...

Page 10

... AN12940AA Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 17 8 kΩ 220 kΩ 44 kΩ 8 kΩ Pin 16, Pin 41 50 kΩ V (2.25 V) REF 14 V (4.5 V) REG (4.5 V) REG 6.3 kΩ Pin 12, 6.3 kΩ Pin 45 10 Signal automatic detection function V (4.5 V) REG We change an audio signal automatic detection function in on/off ...

Page 11

... Revision amplifier entry the amplifier entry to adjust an output level to the HP amplifier. It becomes the entry of the EVR adjustment signal. The entry impedance: The High impedance SDC00044AEB AN12940AA Description Corrugation and Voltage negative feedback pins: : about 9 kΩ : about 9 kΩ AC 19 dBV output pin: AC − ...

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... AN12940AA Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 7 200 kΩ 9 kΩ 96 kΩ 6 Pin REG Pin 52 13.1 kΩ 31.7 kΩ V REF 4 V REG 4 13.1 kΩ 31.7 kΩ V REF 3 220 kΩ 9 kΩ 3 180 kΩ 12 Audio signal on/off changing V (4.5 V) REG ...

Page 13

... Also, it has the func- tion which is the same as the PCcard sig- nal entry by pin 4, the modem signal entry by pin 54 completely. The entry impedance: About 45 kΩ (2.25 V) SDC00044AEB AN12940AA Description Corrugation and Voltage DC 2. 16 dBV DC 5 pin to supply the CC with the voltage ...

Page 14

... AN12940AA Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 53 160 kΩ 53 160 kΩ REG 54 13.1 kΩ 31.7 kΩ V REF 51 V (4.5 V) REG 3.5 kΩ (4.5 V) REG 3.5 kΩ REF V (4.5 V) REG With the pin to fix the bias voltage (the operation point) of the system ...

Page 15

... It is the pin which changes the on level of AGC. 240 kΩ Low : The standard level Open: − standards 40 kΩ 36 High : − standards The entry impedance: About 120 kΩ SDC00044AEB AN12940AA Description Corrugation and Voltage Low: AGC-off High: AGC- 1.5 V ...

Page 16

... AN12940AA Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 35 160 kΩ 68 kΩ (4 REG V REF DC (2. (4.5 V) REG amplifier power saving V (4.5 V) REG It is the pin which controls power 200 kΩ saving by the SP amplifier. At the time 80 kΩ ...

Page 17

... Mounted on four layers of stndard board (50 × 50 × 0 29.2°C/W th(j-a) 3.000 Mounted on stndard board (50 × 50 × 0 2.000 R 79.5°C/W th(j-a) 1.572 1.000 0.862 Independent IC without a heat sink R 144.9°C/W th( j-a) 0.000 100 Ambient temperature T (°C) a SDC00044AEB AN12940AA 125 150 17 ...

Page 18

... AN12940AA Technical data (continued amplifier (1) Lin,Rin Lout,Rout mode SP I/O characteristics 8Ω 5 CC_ L-in, R-in L-out, R-out kHz f req LPF: 30 kHz 25 AGC: off Automatic detection on 30 − ...

Page 19

... Input frequency (kHz 0.1 0.01 50 output frequency characteristics 8Ω 0 0.01 0.001 10 100 0.01 SDC00044AEB AN12940AA SP I/O characteristics 8Ω CC_ Beep L-out, R-out 1 kHz f req HPF: 400 Hz LPF: 30 kHz AGC: off Automatic detection on 40 30 20 − ...

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... AN12940AA Technical data (continued) 2. Main characteristics (continued) 2) Mix amplifier 1 (1) Lin,Rin Lout,Rout mode Mix amplifier 1 system I/O characteristics CC_ L-in, R-in L-out, R-out 1 kHz f req 0 LPF : 30 kHz AGC: on Automatic detection on 10 20 30 40 30 − ...

Page 21

... Input frequency (kHz 0.1 0.01 0.001 30 0 I/O characteristics frequency characteristics 13 dBV 0.01 10 100 0.01 SDC00044AEB AN12940AA Mix amplifier 2 system I/O distortion characteristics CC_ Alarm L-out, R-out 1 kHz f req HPF : 400 Hz LPF : 30 kHz AGC: on Automatic detection on 20 10 0 ...

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... AN12940AA Technical data (continued) 2. Main characteristics (continued) 4) Pre-amplifier (1) R-in Pin 50 mode Signal detection system I/O characteristics CC_ R-in pin kHz f req Pin 18 Low 10 Low sensitivity mode 20 30 40 50 60 80 70 60 50 ...

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... Beep: AGC output distortion characteristics 0 kHz 0.01 10 50 0 SDC00044AEB AN12940AA AGC output distortion characteristics CC_ L-in, R-in L-out, R-out 1 kHz f req Ω AGC: on Automatic detection on Reference output distorition Reference 1 dBV output distorition Reference − ...

Page 24

... AN12940AA Usage Notes 1. Avoid the power line short and the ground short of the pins. 2. Especially positive phase speaker output pins (pin 24, pin 25, pin 32 and pin 33) and reverse phase speaker output pins (pin 26, pin 27, pin 30 and pin 31) have the possibility of break-down caused by the power line short and the ground short ...

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Request for your special attention and precautions in using the technical information and (1) If any of the products or technical information described in this book exported or provided to non-residents, the laws and regulations of the ...

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