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AN12942B Datasheet

Download or read online Panasonic Corporation AN12942B For Information·Communication - Personal Computer pdf datasheet.
Also see for AN12942B: Datasheet #2 (31 pages)



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ICs for Audio Common Use
AN12942B
Audio signal processing IC for notebook PC
Overview
AN12942B is an one-chip IC for the stereo speakers which can output 1 W by 8 Ω, headphone amplifiers, line amplifiers, and
electronic volumes.
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".
Also the AN12942B is built-in power saving on/off function automatically detecting input signal to save the power of speaker
amplifier.
Features
• Speaker amplifier
1 W × 2-channel: 8 Ω, V
= 5 V
CC
• Built-in AGC circuit
Prevention of the resonance or the vibration due to the speaker and the clipping distortion 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 auto power saving).
• Built-in headphone amplifier and line amplifier
Applications
• Notebook PC
Package
• Dual surface implementing package (HSOP056-P-0300A)
Type
• Silicon monolithic bipolar IC
Publication date: June 2003
SDC00047AEB
1

Summary of Contents

Page 1

... Audio signal processing IC for notebook PC Overview AN12942B is an one-chip IC for the stereo speakers which can output Ω, headphone amplifiers, line amplifiers, and electronic volumes. The AGC circuit is built-in to prevent the resonance or the vibration by the speakers energy and the clipping distortion what is called " ...

Page 2

... AN12942B Application circuit example Out-L-ch. (Line) Out-R-ch. (Line) 1 µF Line mute STBY Switch Beep in Switch A 1 µF 1 µF HP power save HP mute 100 µF 100 µF Signal automatic detection function on/off µ 330 kΩ SP save on/off 8 Ω L-ch. out 10 µF − ...

Page 3

... AN12942B Pin Descriptions Pin No. Pin name 1 V _SP CC 2 SP_OUT_R 3 SP_OUT_R 4 SP_OUT_R 5 SP_OUT_R 6 GND_SP 7 DETECT_CAP 8 AGC_LV TTL input 9 GND 10 AGC_CAP 11 DETECT_IN 12 DAMP_OUT 13 OFFSET_HPR 14 OFFSET_HPL 15 GND PRI_V 18 V _IN REF 19 EVR_CTL TTL input 20 BV REF 21 Switch A-1 22 Switch A-2 23 Switch A-3 ...

Page 4

... AN12942B Pin Descriptions (continued) Pin No. Pin name 35 Switch A TTL input 36 HP_SAVE TTL input 37 HP_MUTE TTL input 38 GND 39 HP_OUT_L 40 HP_OUT_R GND 43 V _SP REF 44 SP_IN_R 45 SP_IN_L 46 OFFSET_SPR 47 OFFSET_SPL 48 GND 49 DETECT_ON TTL input 50 SP_SAVE TTL input 51 GND_SP 52 SP_OUT_L 53 SP_OUT_L ...

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... AN12942B Absolute Maximum Ratings A Parameter No. 1 Supply voltage 2 Supply current 3 Power dissipation 4 Storage temperature 5 Operating ambient temperature Note) 1: The values under the condition not exceeding the above absolute maximum ratings and the power dissipation. 2: When using this IC, referring to the technical data in page 17, observe the power dissipation characteristic curve. ...

Page 6

... AN12942B Electrical Characteristics 25°C±2°C unless otherwise specified. Note Parameter No. Circuit current Circuit current 1A at non-signal 1 (V _SP) CC Circuit current 2A at non-signal Circuit current 1B at non-signal 3 (V _SP) CC Circuit current 2B at non-signal Circuit current 1C at non-signal ...

Page 7

... AN12942B Electrical Characteristics 25°C±2°C unless otherwise specified. Note Parameter No Ω) (continued): L-channel, R-channel_input (pin 28, pin 27) Headphone_output (pin 39, pin 40) Headphone Amplifier ( Output distortion L-channel 24 Output distortion R-channel 25 Maximum input level L-channel 26 Maximum input level R-channel ...

Page 8

... AN12942B Electrical Characteristics 25°C±2°C unless otherwise specified. Note Parameter No. Line amplifier part (continued) : L-channel, R-channel_input (pin 28, pin 27) Headphone_output (pin 29, pin 30) 49 Output noise L-channel 50 Output noise R-channel 51 Cross talk in L-channel 52 Cross talk in R-channel 53 Mute attenuation quantity L-channel ...

Page 9

... AN12942B Electrical Characteristics 25°C±2°C unless otherwise specified. Note Parameter No. Switch switching-over voltage level (continued) Signal automatic detection feature 73 off Signal automatic detection feature Speaker-AGC off 76 Speaker-AGC on2 77 Speaker-AGC on1 78 Switch A Off 79 Switch Switch B Off 81 Switch B On Control Terminal, The Mode Table Note) The holding range of control voltage is shown ...

Page 10

... AN12942B Control Terminal, The Leakage Current Table at V Design reference value Pin No. Description 33 Switch B 35 Switch A 37 Headphone mute on/off 8 At the time of AGC on, it changes on level. Pin No. Description 31 Line mute on/off 32 Standby on/off Headphone power save 36 on/off Signal automatic ...

Page 11

... AN12942B Technical Data Circuit diagrams of the input/output part and pin function descriptions Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Waveform Pin No. and voltage V _SP DC: 5.0 V Speaker output V CC (5.0 V) Pin 52, pin 53 52, ...

Page 12

... AN12942B Technical Data (continued) Circuit diagrams of the input/output part and pin function descriptions (continued) Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Waveform Pin No. and voltage Audio automatic detection detection pin Signal nothing DC: 0.0 V Signal’ ...

Page 13

... AN12942B Technical Data (continued) Circuit diagrams of the input/output part and pin function descriptions (continued) Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Waveform Pin No. and voltage 8k Signal automatic detection 220k function 49 on/off control ...

Page 14

... AN12942B Technical Data (continued) Circuit diagrams of the input/output part and pin function descriptions (continued) Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Waveform Pin No. and voltage Pri_charge level pin 17 DC Pin 28, ...

Page 15

... AN12942B Technical Data (continued) Circuit diagrams of the input/output part and pin function descriptions (continued) Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Waveform Pin No. and voltage 34 Beep entry 34 DC: 2.25 V AC: 3 REF 18 18 DC: 2 ...

Page 16

... AN12942B Technical Data (continued) Circuit diagrams of the input/output part and pin function descriptions (continued) Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Waveform Pin No. and voltage 19 EVR control for SP and HP 19 DC: V AGC detection ...

Page 17

... AN12942B Technical Data (continued) Circuit diagrams of the input/output part and pin function descriptions (continued) Note) The characteristics listed below are reference values based on the IC design and are not guaranteed. Waveform Pin No. and voltage SP amplifier power saving on/off control 180k 50 pin DC:  ...

Page 18

... AN12942B Technical Data (continued) Power dissipation of package HSOP056-P-0300A Note) The characteristics listed above are reference values based on the IC design and are not guaranteed.  5.000 4.280 4.000 Mounted on four layers of standard board Soldering radiation plate (50 × 50 × 0.8 mm ...

Page 19

... AN12942B Technical Data (continued) Main characteristics 1) Speaker amplifier Speaker I/O characteristics 8 Ω CC_ L-in, R-in L-out, R-out EVR 3 AGC: Off SP input (pin 45, pin 44) 24 kΩ-ATT HPF: 400 Hz 0 LPF: 20 kHz 10 20 30 30 40 20 L-ch., R-ch. → ...

Page 20

... AN12942B Technical Data (continued) Main characteristics 2) Headphone amplifier Headphone amplifier I/O characteristics - EVR max CC_ L-in, R-in L-out, R-out kHz f req Ω 10 EVR 3 V 20 30 40 50 60 50 40 30 20 Input level (Pin 28, Pin 27) (dBV) ...

Page 21

... AN12942B Technical Data (continued) Main characteristics (continued) 2) Headphone amplifier (continued) Headphone amplifier I/O characteristics - EVR typ CC_ 0 L-in, R-in L-out, R-out 1 kHz f req Ω 10 EVR 1.5 V 20 30 40 50 60 50 40 30 20 Input level (Pin 28, Pin 27) (dBV) EVR attenuate level characteristics – ...

Page 22

... AN12942B Application Notes 1. Linear amplifier circuit block Following block diagrams is line amplifier circuit. Line input L-channel Line input R-channel 1) The gain of the linear amplifier system is 0.83 dB become a connection of the standing in the row, the entry impedance of pin 28, pin 27 becomes 22.5 kΩ. It stores up that these pins also serve as the headphone entry (the impedance 45 kΩ). ...

Page 23

... AN12942B Application Notes (continued) 2. Headphone amplifier circuit block Following block diagrams is headphone amplifier circuit. Headphone input L-channel Headphone input R-channel Beep input 1) The gain of the headphone amplifier system is 6.0 dB when EVR is maximum become a connection of the standing in the row, the entry impedance of pin 28, pin 27 becomes 22.5 kΩ. ...

Page 24

... AN12942B Application Notes (continued) 2. Headphone amplifier circuit block (continued) Beep signal I/O R1 IN1 IN2 R3 IN3 Since input amplifier reverse amplifier system, any input to pin 34 through a resistor from some circuits would not cause any drop of input impedance. Gain 6.75 kΩ ...

Page 25

... AN12942B Application Notes (continued) 3. Speaker amplifier circuit block Following block diagrams is speaker amplifier circuit. SP input L-ch input R-ch The gain of the speaker amplifier system is 17.0 dB. 2) The entry impedance of pin 45, pin 44 becomes 18 kΩ possible to adjust to the direction which lowers a gain in adding resistance to pin 28, pin 27. ...

Page 26

... AN12942B Application Notes (continued) The output wave at the time of AGC operation It is the following output wave form chart at the AGC operation time. AGCoff SP out R-ch. Pin2 Pin3 SP out L-ch. Pin4 Pin5 AGCon2 SP out R-ch. Pin2 Pin3 SP out L-ch. Pin4 Pin5 ...

Page 27

... AN12942B Application Notes (continued) 4. Automatic power save of speaker amplifier function When input signal becomes zero or very small, a speaker amplifier is automatically power save off. 28 EVR 27 EVR In the case that a detection circuit operation error to noise, insert R and C between pin 12 and pin 11 to prevent operation error. ...

Page 28

... AN12942B Application Notes (continued) 5. Mute switch of signal line circuit Pin21 to pin25 When mute is on mode,output reference voltage input via buffer amplifier. Output impedance is equal to or less than 10 Ω. When mute is off mode, it become high impedance. Note Refer to sheet no.12 for circuit of inner IC ...

Page 29

... AN12942B Outside figure (Unit: mm) HSOP056-P-0300A ( Lead-free package 14.00 ± 0.10 (6.90) (5.45 0.50 (0.25) ) Area of no resin flash 29 28 0.10 M 0.10 Seating plane SDC00047AEB (1.00 º º 0.50 ± 0.10 Seating plane 29 ...

Page 30

... AN12942B Usage Notes Avoid the power line short and the ground short of the terminals. Especially positive phase speaker output pins (pin 2, pin 3, pin 54 and pin 55) and negative phase speaker output pins (pin 4, pin 5, pin 52 and pin 53) have the possibility of break-down caused by the power line short and the ground short. ...

Page 31

Request for your special attention and precautions in using the technical information and semiconductors described in this material (1) An export permit needs to be obtained from the competent authorities of the Japanese Government if any of the products or ...

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