AN12941A Panasonic Corporation of North America, AN12941A Datasheet
AN12941A
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AN12941A Summary of contents
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... ICs for Audio Common Use AN12941A Audio power IC for notebook PC ■ Overview The AN12941A 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 " ...
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... AN12941A ■ Application Circuit Example AGC on lebel change 10 µF V _SP CC −2 dBV +4 dBV L-channel SP out 4 Ω Ω −2 dBV SP save on/off 10 kΩ 0.47 µF 0.47 µF 1 µF 100 kΩ 0.47 µF HP out L-channel −16 dBV −16 dBV HP amplifier L-channel 0.47 µF −22 dBV − ...
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... Audio mix amplifier L-channel output 49 Voltage output for AGC level change 50 Signal auto detection amplifier L-channel input 51 Signal auto detection mix amplifier L-channel output 52 L-channel input 53 V REF 54 Input for modem 55 GND 56 Input for beep SDC00056AEB AN12941A Description 3 ...
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... AN12941A ■ Absolute Maximum Ratings Parameter Supply voltage *1 Supply current Power dissipation *2 Operating ambient temperature *3 Storage temperature *3 Operating ambient atmospheric pressure Operating constant gravity Operating shock Note The values under the condition the above absolute maximum ratings and the power dissipation. ...
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... V MDSPR −10 dBV, 1 kHz, pin 4 input PCSPL IN V PCSPR kHz THD = kHz THD = 1% HPMAL HPMAR SDC00056AEB AN12941A Min Typ Max Ω 2.0 4.0 6 Ω 2.0 4.0 6 Ω, 0.04 0 Ω, ...
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... AN12941A ■ Electrical Characteristics at V Note 25°C ± 2°C unless otherwise specified. a Parameter Mix amplifier characteristic 2 (continued) (Pin 56, pin 54, pin 52, pin 4, pin 6 → pin 44, pin 13) L-channel, R-channel mix amplifier cross talk in case of signal off Signal detection system characteristic (Pin 52, pin 6, pin 54, pin 56, pin 4 → pin 51, pin 39) Pre-amplifi ...
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... It is the specifically designed power pin of the speaker amplifier. Pin 28 is for R-channel Pin 29 is for L-channel Because the big electric current flows,it is desirable to separate from the the board pattern. SDC00056AEB AN12941A Min Typ Max 2.0 5.0 0.0 0.8 ...
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... AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 24, V _SP CC 25, (5.0 V) 26, 27 30, 31, 3.6 kΩ 32 kΩ 8 Speaker Output: Pin output pins of the speaker 32 amplifier. It becomes BTL output The L-channel positive phase output pin: 18 kΩ ...
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... High: Function on Low: Function off The entry impedance: The high impedance SDC00056AEB AN12941A Description Corrugation and Voltage Signal nothing Signals there being 2 ...
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... AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 16, 41 Pin 16 50 kΩ (1.5 V) REF 14, V (3.0 V) REG 43 13, 44 12.7 kΩ 12, V (3.0 V) REG 45 9 kΩ Pin Speaker amplifier entry the voice input pins of the speaker amplifier. To make offset voltage in power saving on/off changing by the Speaker amplifi ...
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... Low: Signal off The entry impedance: The high impedance Audio signal input: It enters a main audio signal. Pin 6: R-channel entry Pin 52: L-channel entry The entry impedance: About 45 kΩ SDC00056AEB AN12941A Description Corrugation and Voltage DC 1 −28 dBV DC AC −28 dBV DC ...
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... AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 4 V (3.0 V) REG 4 25.2 kΩ 25.2 kΩ V REF 3 V (3.0 V) REG 3 207 kΩ kΩ 126 kΩ PCcard signal entry the entry pin to enter a signal from the PCcard. With the audio signal mix amplifier of the following paragraph, the same signal is entered both by L-channel and R-channel ...
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... L-channel and R-channel. Also, it has the function which is the same as the PCcard signal entry by pin 4, the beep signal entry by pin 56 completely. The entry impedance: About 45 kΩ SDC00056AEB AN12941A Description Corrugation and Voltage Open voltage 1 −22 dBV DC 1 ...
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... AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 39, V (3.0 V) REG 51 V REF (1.5 V) 0.9 kΩ 38, Pin 38, 50 Pin 50 10 kΩ V REF 40 V (3.0 V) REG kΩ 17 kΩ 63 kΩ 9 kΩ 14 The signal detection system pre-amplifier negative return terminal the output terminal for signal detection system pre-amplifi ...
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... Standard bias source for EVR possible to use as GND (the DC bias source) AC when connecting external EVR possible to attenuate in the AC signal without cutting a signal system in "C". The output impedance: 8 Equal to or less than about 10 Ω SDC00056AEB AN12941A Corrugation and Voltage ...
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... AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 11, V (3.0 V) REG 46 16 Description Output pins for the HP amplifier output pins for the external HP amplifier. The signal which was adjusted in the volume in EVR can be output by the low impedance. Pin 11 ...
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... Mix ratio · Signal from PCcard · Beep signal · Signal from modem Mix 0 dB External 9 Vol.out Mix volume audio signal 11 10 0dB Mix R-channel 8 V REF SDC00056AEB AN12941A It becomes the volume for sound control by external resistance change. Gain maximumvolume. 17 ...
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... AN12941A ■ Application Notes (continued) 2. Signal detection system mix circuit block Signal detection system mix circuit block 1) Each input signal in accordance with mix ratio Signals are detected by separate systems to prevent cancellation in the case of negative phase input for main signal R-channel and L-channel. ...
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... Detection threshold value (L-channel) 10 100 Resistance constant (between pin 50 and pin 51) (kΩ Automatic signal detection function on/off 17 47 kΩ Signal 22 detection Power save of 21 speaker power amplifier 0.047 µF SDC00056AEB AN12941A 1 000 V CC Automatic signal detection monitor pin Power save on/off 19 ...
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... AN12941A ■ Application Notes (continued) 3. Main signal on/off change and alarm signal mix circuit block Main signal on/off circuit 1) The speaker amplifier section is set to Mute when main signal is off. 2) High: Signal on , Low: Signal off Main signal level adjustment 1) The gain of this inverting amplifi ...
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... The output wave at the time of AGC operation It is the following output wave form chart at the AGC operation time. Graph showing output wave when identical sound signals are input to two AN12941A ICs, one with AGC set to off and the other with AGC set to on. ...
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... AN12941A ■ Application Notes (continued) 5. Speaker amplifier circuit block DC shift circuit 1) Shift circuit operating point of signal (bias voltage signal) from V DC voltage (speaker output) of output becomes V Speaker amplifier 1) Speaker amplifier is BTL amplifier system of 2-channel. ...
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... Time difference: Equal to or more than 1.0 sec Standby control reset (Control voltage: Change low to high _SP) pin. REF REF ): Change on to off CC SDC00056AEB AN12941A SP and V atart up CC_ CC SP and V CC_ CC *1 Speaker pawer save control reset (Control voltage: Change low to high) ...
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... AN12941A ■ Application Notes (continued) 6. Control order at power supply on/off chcange (continued) Power supply off (continued) 2) Control timing V SP (Pin 28, pin 29) CC_ V (Pin 1) CC Standby control (Pin 5) Speaker pawer save control (Pin 35) Speaker pawer save control on (Control voltage: Change high to low) ...
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... Application Notes (continued) Main characteristics 1) I/O characteristics, frequency characteristics (1) SP I/O level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = On, SP gain setting = High, V Input frequency = 1 kHz, R-out = 8 Ω, HPF: 400 Hz, LPF: 30 kHz = 3 SDC00056AEB AN12941A _SP = 5 ...
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... AN12941A ■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (1) SP I/O level, distortion characteristics (R-channel, L-channel) (continued) AGC = Off, Automatic detection = On, SP gain setting = Low, V Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz SDC00056AEB _SP = 5 ...
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... Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (2) SP I/O level, distortion characteristics (Beep) AGC = Off, Automatic detection = Off, SP gain setting = High, V Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz = 3 SDC00056AEB AN12941A _SP = 5 ...
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... AN12941A ■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (3) SP frequency level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = On, SP gain setting = High, V Input level = −22 dBV SDC00056AEB _SP = 5 ...
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... Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (3) SP frequency level, distortion characteristics (R-channel, L-channel) (continued) AGC = Off, Automatic detection = On, SP gain setting = Low, V Input level = −16 dBV = 5 SDC00056AEB AN12941A _SP = 5 ...
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... AN12941A ■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (4) SP frequency level, distortion characteristics (Beep) AGC = Off, Automatic detection = Off, SP gain setting = High, V Input level = −22 dBV SDC00056AEB _SP = 5 ...
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... Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (5) SP − AGC I/O level, distortion characteristics (R-channel, L-channel) AGC = On, Automatic detection = On, V Input frequency = 1 kHz, R-out = 8 Ω, HPF: 400 Hz, LPF: 30 kHz = 3 _SP = 5 SDC00056AEB AN12941A 31 ...
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... AN12941A ■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (6) SP − AGC frequency level, distortion characteristics (R-channel, L-channel) AGC = On, Automatic detection = On, V Input frequency = 1 kHz, R-out = 8 Ω, HPF: 400 Hz, LPF: 30 kHz _SP = 5 SDC00056AEB ...
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... Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (7) Mix amplifier I/O level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP power save, V Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz = 3 _SP = 5 SDC00056AEB AN12941A 33 ...
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... AN12941A ■ Application Notes (continued) Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (8) Mix amplifier frequency level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP power save, V Input level = −10 dBV _SP = 5 SDC00056AEB ...
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... Application Notes (continued) Main characteristics (continued temperature variation characteristics CC (1) SP output level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP gain setting = High, V Input frequency = 1 kHz Ω, HPF: 400 Hz, LPF: 30 kHz L SDC00056AEB AN12941A _SP = 5 −22 dBV ...
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... AN12941A ■ Application Notes (continued) Main characteristics (continued temperature variation characteristics (continued) CC (1) SP output level, distortion characteristics (R-channel, L-channel) (continued) AGC = Off, Automatic detection = Off, SP gain setting = High, V Input frequency = 1 kHz Ω, HPF: 400 Hz, LPF: 30 kHz L SDC00056AEB _SP = 5 − ...
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... Application Notes (continued) Main characteristics (continued temperature variation characteristics (continued) CC (2) SP maximum output level characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP gain setting = High, V Input frequency = 1 kHz Ω, HPF: 400 Hz, LPF: 30 kHz L SDC00056AEB AN12941A _SP = 5 ...
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... AN12941A ■ Application Notes (continued) Main characteristics (continued temperature variation characteristics (continued) CC (3) SP − AGC output level characteristics (R-channel, L-channel) AGC = On, Automatic detection = Off, SP gain setting = High −6 dBV, Input frequency = 1 kHz _SP = 5.0 V, P36 = 1. Ω, HPF: 400 Hz, LPF: 30 kHz ...
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... Application Notes (continued) Main characteristics (continued temperature variation characteristics (continued) CC (4) Mix amplifier output level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP power save −10 dBV, Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz in _SP = 5 SDC00056AEB AN12941A 39 ...
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... AN12941A ■ Application Notes (continued) Main characteristics (continued temperature variation characteristics (continued) CC (5) Signal detection threshold value (R-channel, L-channel) AGC = Off, Automatic detection = On, V Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz 40 _SP = 5 SDC00056AEB ...
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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 ...