ICs for Audio Common Use AN12941A Audio power IC for notebook PC Unit: mm ■ Overview Area of no resin flash 14.00±0.10 (6.90) (5.45) 29 (2.25) (3.70) 6.10±0.10 8.10±0.20 56 Seating plane The AN12941A 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, to reduce power consumption, AN12941A has a built-in function which automatically detects the input signal and can automatically enter power save mode when there is no signal. (1.00) 1.20 max. 28 ■ Features Speaker amplifier is 1 W × 2-channel: 8 Ω, VCC = 5 V or 2 W × 2-channel: 4 Ω, VCC = 5 V 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). Operating supply voltage: VCC 3.0 V to 5.5 V/ VCC_SP 3.0 V to 5.5 V 0.20±0.05 0.10 M Seating plane (1.00) 0.15±0.05 0.10 0.50 (0.25) 0.10±0.10 1 0° to 8° 0.50±0.10 HSOP056-P-0300A (Lead-free package) ■ Applications Notebook PC, LCD monitor with speaker 4 Ω to 8 Ω Speaker amplifier R L Input4 Input3 Input2 Input1 AGC SW AGC on level SW Signal automatic detection SW Audio signal detection sensitivity SW SP power save SW Main signal mute SW Standby SW ■ Block Diagram AGC Mix circuit AGC Automatic detection Automatic power save Publication date: April 2004 SDC00056AEB 1 AN12941A ■ Application Circuit Example +14 dB 30 0.47 µF Power Save 32 33 +14 dB 35 SP GND 37 GND 38 HP out L-channel 0.47 µF Signal Det. −22 dBV −28 dBV 8 20 kΩ 0.47 µF 47 17 −16 dBV 0 dB 0 dB 0.47 µF 4.7 µF −16 dBV 0.47 µF −22 dBV −16 dBV −22 dBV AGC +3 dB +3 dB +3 dB 0.47 µF −2 dBV Automatic detection output 47 kΩ 0.047 µF 14 13 0 dB 10 0 dB AGC on/off 4.7 µF Audio automatic detection on/off control 0.47 µF 15 GND 11 0 dB −16 dBV −16 dBV −22 dBV −28 dBV HP out R-channel HP amplifier R-channel 0.47 µF 9 0 dB 49 2.4 V 50 −22 dBV −28 dBV 20 kΩ VREF 8 7 Signal on/off 6 −22 dBV −28 dBV −6 dB 5 Standby 52 −6 dB VREF 53 −22 dBV −28 dBV 54 −22 dBV −28 dBV −6 dB 55 −22 dBV −28 dBV −6 dB −2 dBV +4 dBV R-channel SP out 4 Ω to 16 Ω 12 48 56 16 +9 dB AGC 51 −16 dBV L-channel in −22 dBV 22 20 GND 19 VREF (SP) Det. 41 VCC _SP 23 18 40 10 µF 21 46 10 kΩ 2 Mute Mute 10 kΩ −16 dBV −16 dBV 44 +3 dB HP amplifier L-channel 45 from beep SP GND Save CTL Control 42 GND +9 dB 43 0.47 µF REF 24 +14 dB −16 dBV 1 µF 100 kΩ Audio control volume V 25 39 0.47 µF 27 26 36 10 kΩ +14 dB 31 34 SP save on/off 28 −16 dBV −2 dBV +4 dBV L-channel SP out 4 Ω to 16 Ω −2 dBV VCC _SP VCC _SP 29 −16 dBV 10 µF VCC _SP from modem Supply voltage 3.3 V Supply voltage 5 V AGC on lebel change 4 −6 dB REG 3 2 Beep −22 dBV −28 dBV SDC00056AEB VCC 1 −16 dBV −22 dBV Audio control volume VREF Signal on/off R-channel in 0.47 µF STB −16 dBV −22 dBV from PCcard 0.47 µF 1 µF 10 µF SP gain high/low SW AN12941A ■ Pin Description Pin No. Description Pin No. Description 1 VCC 29 VCC_SP L-channel 2 SP gain high/low SW 30 SP amplifier L-channel negative phase output (−) 3 REG ripple filter pin 31 SP amplifier L-channel negative phase output (−) 4 Input for PCcard 32 SP amplifier L-channel positive phase output (+) 5 Standby on/off control 33 SP amplifier L-channel positive phase output (+) 6 R-channel input 34 GND_SP L-channel 7 Main signal mute on/off control 35 SP power save control 8 VREF R-channel for volume 36 AGC on level control 9 Audio mix amplifier R-channel output 37 GND 10 Volume control signal R-channel input 38 Signal auto detection amplifier R-channel input 11 R-channel output for HP amplifier 39 Signal auto detection mix amplifier R-channel output 12 Negative feedback pin for alarm mix amplifier R-channel 40 AGC demodulation pin 13 Alarm mix amplifier R-channel output 41 SP amplifier L-channel input 14 AGC R-channel output 42 GND 15 GND 43 AGC L-channel output 16 SP amplifier R-channel input 44 Alarm mix amplifier L-channel output 17 Signal automatic detection on/off control 45 Negative feedback pin for alarm mix amplifier L-channel 18 AGC on/off control 46 L-channel output for HP amplifier 19 VREF_SP 47 Volume control signal L-channel input 20 GND 48 Audio mix amplifier L-channel output 21 Demodulation pin for signal automatic detection 49 Voltage output for AGC level change 22 Signal automatic detection output 50 Signal auto detection amplifier L-channel input 23 GND_SP R-channel 51 Signal auto detection mix amplifier L-channel output 24 SP amplifier R-channel positive phase output (+) 52 L-channel input 25 SP amplifier R-channel positive phase output (+) 53 VREF 26 SP amplifier R-channel negative phase output (−) 54 Input for modem 27 SP amplifier R-channel negative phase output (−) 55 GND 28 VCC_SP R-channel 56 Input for beep Note) SP: Speaker HP: Headphone REG: Regulator SDC00056AEB 3 AN12941A ■ Absolute Maximum Ratings Parameter Supply voltage Symbol Rating Unit VCC 5.75 V VCC_SP 5.75 ICC Ａ PD 517 mW Topr −20 to +75 °C Tstg −55 to +150 *1 Supply current Power dissipation *2 Operating ambient temperature Storage temperature *3 *3 1.013 × 105 ± 0.61 × °C 105 Operating ambient atmospheric pressure Popr Pa Operating constant gravity Gopr 9 810 m/s2 Operating shock Sopr 4 900 m/s2 Note) *1: The values under the condition the above absolute maximum ratings and the power dissipation. *2: Ta = 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 ■ Technical Data, • Power dissipation of package HSOP056-P-0300A) *3: Except for the storage temperature and operating ambient temperature, all ratings are for Ta = 25°C. ■ Recommended Operating Range Parameter Supply voltage Symbol Rating Unit VCC 3.0 to 5.5 V VCC_SP* 3.0 to 5.5 Note) *: The values under the condition the above absolute maximum ratings and the power dissipation. ■ Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V Note) Ta = 25°C ± 2°C unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit Circuit current Circuit current 1A at non-signal (VCC) IVCCA VCC = 3.3 V, at non-signal, Automatic distinction: on 4.4 8.7 13.0 mA Circuit current 2A at non-signal (VCC_SP) IVCCSA VCC = 3.3 V, at non-signal, Automatic distinction: on 400 600 µA Circuit current 1B at non-signal (VCC) IVCCB VCC = 3.3 V, at non-signal, Power save: off at non-automatic distinction 4.8 9.5 14.2 mA Circuit current 2B at non-signal (VCC_SP) IVCCSB VCC = 3.3 V, at non-signal, Power save: off at non-automatic distinction 8.1 16.2 mA Circuit current 1C at non-signal (VCC) IVCCC VCC = 3.3 V, at non-signal, Power save: on at non-automatic distinction 4.1 8.1 12.1 mA Circuit current 2C at non-signal (VCC_SP) IVCCSC VCC = 3.3 V, at non-signal, Power save: on at non-automatic distinction 400 600 µA 4 SDC00056AEB AN12941A ■ Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V (continued) Note) Ta = 25°C ± 2°C unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit Circuit current (continued) Circuit current 1D at non-signal (VCC) IVCCD VCC = 3.3 V, at standby mode 10 50 µA Circuit current 2D at non-signal (VCC_SP) IVCCSD VCC = 3.3 V, at standby mode 10 50 µA Speaker amplifier (Pin 52, pin 6 → pin 24 to pin 27, pin 33 to pin 30) L-channel audio output level VOSPL VIN = −22 dBV, 1 kHz, RL = 8 Ω 2.0 4.0 6.0 dBV R-channel audio output level VOSPR VIN = −22 dBV, 1 kHz, RL = 8 Ω 2.0 4.0 6.0 dBV L-channel audio output distortion THSPL VIN = −22 dBV, 1 kHz, RL = 8 Ω, to THD fifth 0.04 0.5 % R-channel audio output distortion THSPR VIN = −22 dBV, 1 kHz, RL = 8 Ω, to THD fifth 0.04 0.5 % L-channel audio output noise VNSPL At non-signal, RL = 8 Ω, A curve filter −65 −62 dBV R-channel audio output noise VNSPR At non-signal, RL = 8 Ω, A curve filter −74 −68 dBV L-channel maximum output power VM8SPL VIN = 1 kHz, at THD = 10%, RL = 8 Ω, to THD fifth, at AGC = off 0.7 1.0 W R-channel maximum output power VM8SPR VIN = 1 kHz, at THD = 10%, RL = 8 Ω, to THD fifth, at AGC = off 0.7 1.0 W L-channel maximum output power VM4SPL VIN = 1 kHz, at THD = 10%, RL = 4 Ω, to THD fifth, at AGC = off 2.0 W R-channel maximum output power VM4SPR VIN = 1 kHz, at THD = 10%, RL = 4 Ω, to THD fifth, at AGC = off 2.0 W Cross talk R-channel → L-channel VCTSPL VIN = −22 dBV, 1 kHz, RL = 8 Ω A curve filter 64 68 dB Cross talk L-channel → R-channel VCTSPR VIN = −22 dBV, 1 kHz, RL = 8 Ω A curve filter 64 68 dB AGC output level VAGSPL VIN = −6 dBV, 1 kHz, RL = 8 Ω VAGSPR A curve filter 5.5 7.0 8.5 dBV Mix amplifier characteristic 1 (Pin 4, pin 54, pin 56 → pin 46, pin 11) L-channel, R-channel output level at beep signal mix VBESPL VIN = −10 dBV, 1 kHz, pin 56 input VBESPR −17 −16 −15 dBV L-channel, R-channel output level at modem signal mix VMDSPL VIN = −10 dBV, 1 kHz, pin 54 input VMDSPR −17 −16 −15 dBV L-channel, R-channel output level at PCcard signal mix VPCSPL VIN = −10 dBV, 1 kHz, pin 4 input VPCSPR −17 −16 −15 dBV VIN = 1 kHz, VIN at THD = 1% 0.6 V[rms] VHPMAL VIN = 1 kHz, VIN at THD = 1% VHPMAR 0.3 V[rms] Each entry pin max input level Maximum amplifier output for the HP amplifier SDC00056AEB 5 AN12941A ■ Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V (continued) Note) Ta = 25°C ± 2°C unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit −75 dBV 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 VOFSPL VIN = −16 dBV, 1 kHz cross talk in case of signal off VOFSPR pins 4, 6, 52, 54, 56: input −81 Signal detection system characteristic (Pin 52, pin 6, pin 54, pin 56, pin 4 → pin 51, pin 39) Pre-amplifier output at L-channel input VSDTL VIN = −46 dBV, 1 kHz −22 −20 −18 dBV Pre-amplifier output at R-channel input VSDTR VIN = −46 dBV, 1 kHz −22 −20 −18 dBV Pre-amplifier output at beep signal input VSDTBE VIN = −46 dBV, 1 kHz −22 −20 −18 dBV Pre-amplifier output at modem signal input VSDTMD VIN = −46 dBV, 1 kHz −22 −20 −18 dBV Pre-amplifier output at PCcard signal input VSDTPC VIN = −46 dBV, 1 kHz −22 −20 −18 dBV Detection level 1 at high sensitivity VSDTTH VIN = 1 kHz −65 −60 −55 dBV Distinction output high level VSDTHI VIN = 1 kHz 2.3 3.3 V Distinction output low level VSDTLO VIN = 1 kHz 0.1 1.0 V Voltage holding mode Entry signal on/off Voltage range holding on V7H 2.0 5.0 V Entry signal on/off Voltage range holding off V7L 0.0 0.8 V AGC on/off Voltage range holding on V18H 2.0 5.0 V AGC on/off Voltage range holding off V18L 0.0 0.8 V Signal automatic detection function Voltage range holding on V17H 2.0 5.0 V Signal automatic detection function Voltage range holding off V17L 0.0 0.8 V Sandby on/off Voltage range holding off V5H 2.0 5.0 V Sandby on/off Voltage range holding on V5L 0.0 0.8 V SP amplifier power save on/off Voltage range holding off V35H 2.0 5.0 V SP amplifier power save on/off Voltage range holding on V35L 0.0 0.8 V 6 SDC00056AEB AN12941A ■ Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V (continued) Note) Ta = 25°C ± 2°C unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit Voltage holding mode (continued) SP gain high/low SW +6 dB/0 dB Voltage range holding +6 dB V2H 2.0 5.0 V SP gain high/low SW +6 dB/0 dB Voltage range holding 0 dB V2L 0.0 0.8 V ■ Control terminal , The mode table Pin No. Pin Name Voltage of Pin Low High Remarks 7 Entry signal on/off Signal off Signal on 18 AGC on/off AGC off AGC on 17 Signal automatic detection function Automatic distinction off Automatic distinction on 5 Standby on/off STB on STB off 35 SP power save on/off Save on (SP off) Save off (SP on) The power saving operation by pin 35 has priority over any automatic detection 2 SP gain high/low SW 0 dB +6 dB The gain difference is about 6 dB Pin No. 36 Voltage of Pin Pin Name 0.5 V to 1.5 V At the time of AGC: on, It changes on level. On level: −3 dB to +3 dB Note) *: The holding range of control voltage is shown in page 6 to page 7 of ■ Electrical Characteristics. ■ Terminal Equivalent Circuits Pin No. Equivalent Circuits 28, 29 Description VCC_SP: 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 VCC line to the other power pin on the board pattern. SDC00056AEB Corrugation and Voltage DC 5 V 7 AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. 24, 25, 26, 27 30, 31, 32, 33 Equivalent Circuits VCC_SP (5.0 V) 18 kΩ Pin 30 33 24 27 3.6 kΩ 23, 34 45 kΩ Corrugation and Voltage Speaker Output: It is output pins of the speaker amplifier. It becomes BTL output. The L-channel positive phase output pin: Pin 32, pin 33 The L-channel negative phase output pin: Pin 30, pin 31 The R-channel positive phase output pin: Pin 24, pin 25 The R-channel negative phase output pin: Pin 26, pin 27 To reduce voltage loss by the wire resistance in maximum output, it makes output 2 pins. Also, when the speaker amplifier saves power, too, DC voltage is maintained. The output impedance: Equal to or less than 10 Ω DC 2.2 V AC 4 dBV GND: It is GND pin for the speaker amplifier. Pin 23 is for R-channel Pin 34 is for L-channel Because the big electric current flows, it is desirable to separate from the GND line to the other GND pin on the board pattern. Also, it isn't connected with the substrate potential in the IC. 22 8 Pin 31 32 25 26 Description 22 Pin 32, pin 33 Pin 24, pin 25 positive Pin 30, pin 31 Pin 26, pin 27 negative DC 0 V Audio signal automatic detection Signal nothing distinction output: DC 0 V It outputs the distinction result of Signals there the audio signal automatic detection being DC 3.3 V circuit. The output form is the open collector output from of the NPN transistor. Therefore, the pull rises and uses for the power by the external resistance (equal to or more than 10 kΩ). Signal's there being: Output high Signal nothing: Output low Open collector output The electric current ability: Equal to or more than 100 µA SDC00056AEB AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 21 Description VREG (3.0 V) 90 Ω 21 90 kΩ 15, 20, 37, 42, 55 Audio automatic detecting detection Signal nothing DC 0 V pin: It connects a condenser for the peak Signals there detection. It is the circuit which being DC 2 V detects a peak after rectifying the audio signal of the audio signal automatic detection circuit in both waves. By changing a capacity value, the time which the power saving depends on in case of the switchover which is without signal with signal's there being can be changed. Signal less time: Constant current source Signal's there being: Emitter follower The output impedance: About 200 Ω GND: It is the GND pin of the signal system. It is connected with the substrate potential of the IC. Pin 15, pin 42 connect with the lead frame of the IC. DC 0 V VCC_SP (5.0 V) VREF_SP: It is the standard voltage pin to fix the DC bias of the speaker output. It connects a condenser to remove a ripple. The output impedance: About 60 kΩ DC 2.2 V 49-pin (2.4 V) Signal automatic detection function on/off control pin: We change an audio signal automatic detection function in on/off. In case of automatic detection off, it controls power saving by speaker with the manual with the power saving on/off pin. High: Function on Low: Function off The entry impedance: The high impedance DC 19 Corrugation and Voltage 133 kΩ 19 137 kΩ 17 9 kΩ 27 kΩ 63 kΩ 9 kΩ 45 kΩ 17 SDC00056AEB 9 AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits Description DC 1.5 V Speaker amplifier entry: It is the voice input pins of the AC −16 dBV speaker amplifier. To make offset voltage in power saving on/off changing by the Speaker amplifier amplifier little, it combines capacity. (It makes pop noise small). Pin 16: R-channel SP amplifier entry Pin 41: L-channel SP amplifier entry The entry impedance: About 50 kΩ 16, 41 Pin 16 41 50 kΩ VREF (1.5 V) 14, 43 VREG (3.0 V) Pin 14 43 90 Ω 13, 44 12.7 kΩ 12, 45 VREG (3.0 V) Pin 12 45 10 9 kΩ 18 kΩ Corrugation and Voltage AGC amplifier output: DC 1.5 V It is the output pin of the AGC circuit AC −16 dBV to hold an output clip in excessive output of the speaker output. Pin 14: The AGC R-channel output Pin 43: The AGC L-channel output The output impedance: Equal to or less than about 10 Ω VREG (3.0 V) Alarm mix amplifier output pins: It is output pins of the mix amplifier to mix an alarm signal and an audio signal. Pin 13: R-channel output Pin 13 Pin 44: L-channel output 44 The output impedance: Equal to or less than about 10 Ω Alarm mix amplifier negative feedback pins: It is the negative feedback of the mix amplifier to mix an alarm signal and an audio signal. It is possible to adjust in the direction which lowers the gain of the mix amplifier in putting resistance among above mentioned mix amplifier output pins. Pin 12: R-channel negative feedback pin Pin 45: L-channel negative feedback pin The entry impedance: The high impedance SDC00056AEB DC 1.5 V AC −25 dBV DC 1.5 V AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. 9, 48 Equivalent Circuits Description VREG (3.0 V) 4.6 kΩ Pin 9 48 4.6 kΩ 10, 47 Pin 10 47 7 49-pin (2.4 V) 81 kΩ 90 kΩ 126 kΩ 6, 52 Pin 6 VREG (3.0 V) 52 25.2 kΩ Audio signal mix amplifier output pin: DC 1.5 V It is the output of the mix amplifier AC −28 dBV to mix a signal from the modem, the beep, the PCcard to an audio signal. Pin 9: The R-channel output Pin 48: The L-channel output The output impedance: Equal to or less than about 10 Ω Entry for EVR: It is 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 VREG (3.0 V) 7 Corrugation and Voltage Audio signal on/off changing control pin: It is the control pin which changes whether to communicate an audio signal to the amplifier to mix an alarm signal and an audio signal. At the time of off, only an alarm audio is output from the mix amplifier. High: Signal on 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 DC AC −28 dBV DC DC 1.5V AC −22 dBV 25.2 kΩ VREF (1.5 V) SDC00056AEB 11 AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 4 VREG (3.0 V) 4 25.2 kΩ 25.2 kΩ Description Corrugation and Voltage PCcard signal entry: It is 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. Also, it has the function which is the same as the beep entry of pin 56, the modem entry by pin 54 completely. The entry impedance: About 45 kΩ DC 1.5V AC −16 dBV Ripple removal condenser pin for the regulator: To remove a power ripple with the regulator circuit to create the inner power (VREG), it puts a condenser. The entry impedance: About 100 kΩ DC 1.5 V SP gain high/low CTL: It is the terminal which controls gain 0 dB/+6 dB of SP output. High: +6 dB Low: 0 dB The entry impedance: The high impedance DC VCC : It is the power (VCC) pin to supply the regulator circuit to create the inner power VREG with the voltage. It is separating from VCC_SP of pin 28, pin 29 fully inside. It is desirable to separate as far as it finishes coming out about the P board pattern, too. DC 3.3 V VREF (1.5 V) 3 VREG (3.0 V) VCC (3.3 V) 243 kΩ 3 9 kΩ 207 kΩ 2 49-pin (2.4 V) 81 kΩ 90 kΩ 126 kΩ 1 12 2 SDC00056AEB AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 5 5 90 kΩ 270 kΩ 56 56 25.2 kΩ 25.2 kΩ VREF (1.5 V) 53 VREG (3.0 V) 180 kΩ 53 180 kΩ 54 VREG (3.0 V) 54 25.2 kΩ 25.2 kΩ VREF (1.5 V) Description Corrugation and Voltage Standby on/off changing SW: Open voltage DC 0 V It changes whether or not it makes this IC an operation condition or whether or not it makes it a standby. High: The operation condition Low: Standby In that the power changes a connected condition to the standby, the circuit electric current can be almost made 0. The entry impedance: About 80 kΩ Beep input: It is the entry pin to enter beep signal. The same signal is entered both by L-channel and R-channel with the audio signal mix amplifier of the following paragraph. Also, it has the function which is the same as the PCcard signal entry by pin 4, the modem signal entry by pin 54 completely. The entry impedance: About 45 kΩ DC 1.5 V AC −22 dBV VREF: With the pin to fix the bias voltage (the operation point) of the system which the inner power (VREG) works, it becomes 1/2VREG (V). To remove noise, it connects a condenser with the interval of between pin 53 and GND. The entry impedance: About 80 kΩ DC 1.5 V Modem input: It is the entry pin to enter a signal from the modem. With the audio signal mix amplifier of the following paragraph, the same signal is entered both by 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 DC 1.5 V AC −22 dBV SDC00056AEB 13 AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. 39, 51 Equivalent Circuits Description VREG (3.0 V) VREF (1.5 V) 9 kΩ Corrugation and Voltage The signal detection system pre-amplifier negative return terminal: It is the output terminal for signal detection system pre-amplifier. Pin 39 The output impedance: 51 Equal to or less than about 10 Ω DC 1.5 V AC −22 dBV The signal detection system pre-amplifier input terminal: It is the input terminal for signal detection system pre-amplifier. The entry impedance: About 10 kΩ DC 1.5 V AC −22 dBV AGC detection pin: It is the detection circuit to detect the signal level of the AGC circuit of the SP output for the clip prevention. It connects a condenser for the detection. The entry impedance: Unsettled DC 0 V to 1 V 0.9 kΩ 38, 50 Pin 38, Pin 50 10 kΩ VREF (1.5 V) 40 VREG (3.0 V) 1.8 kΩ 40 144 kΩ 18 9 kΩ 17 kΩ 63 kΩ 9 kΩ 14 49-pin (2.4 V) 90 kΩ 18 AGC on/off control pin: It is the pin which controls the operating operation of the AGC circuit of the SP output for the clip prevention in on/off. At the time of off, the AGC circuit doesn't work. High: AGC on Low: AGC off The entry impedance: The high impedance SDC00056AEB DC AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent Circuits 49 Description VREG (3.0 V) 8.1 kΩ 49 Corrugation and Voltage DC output for the AGC on level adjustment: It is an DC voltage output terminal for the AGC on level adjustment. The output impedance: Equal to or less than about 10 Ω DC 2.4 V It changes AGC on level: It is the pin which changes the on level of AGC. The entry impedance: The high impedance DC 1.5 V SP amplifier power saving on/off control pin: It is the pin which controls power saving by the SP amplifier. At the time of on in addition to the control in case of automatic distinction function off, too, power saving on by pin 50 has priority over. The entry impedance: The high impedance DC 1.3 V Standard bias source for EVR: It is possible to use as GND (the DC bias source) AC when connecting external EVR. It is possible to attenuate in the AC signal without cutting a signal system in "C". The output impedance: Equal to or less than about 10 Ω DC 1.5 V 11.3 kΩ 36 36 35 49-pin (2.4 V) 81 kΩ 45 kΩ 35 128 kΩ 8 VREG (3.0 V) VREF DC 1.5 V 8 SDC00056AEB 15 AN12941A ■ Terminal Equivalent Circuits (continued) Pin No. 11, 46 Equivalent Circuits Description VREG (3.0 V) Pin 11 46 16 Output pins for the HP amplifier: It is output pins for the external HP amplifier. The signal which was adjusted in the volume in EVR can be output by the low impedance. The output impedance: Equal to or less than about 10 Ω SDC00056AEB Corrugation and Voltage DC 1.5 V AC −28 dBV AN12941A ■ Application Notes Circuit Descriptions 1. Input inverting amplifier and signal mix circuit block Input inverting amplifier block 1) The input impedance of each input pin is about 50 kΩ. 2) Each input impedance is ±10% of variation exists by diffusion variation. 3) The gain of the input part is able to lowered by adding resistance to input pin in series. When addition resistance is set to Ra (kΩ) 25.2 Ga = 50 + Ra Signal mix circuit block 1) It is added (mix) in the inverting amplifier method. Mix ratio is 1 to 1 for each input. 2) Connect volume to this mix amplifier output, allowing you to vary the next stage input level. 3) Pin 8 is the VREF output pin for volume reference. Audio signal L-channel input 48 25.2 kΩ 25.2 kΩ PCcard input 0 dB 25.2 kΩ 52 4 Mix External volume Mix 47 25.2 kΩ 56 25.2 kΩ 25.2 kΩ Modem signal input 46 L-channel 8 V REF It adds to the main audio signals in inverting amplifier form. Mix ratio is 1 to 1. · Signal from PCcard · Beep signal · Signal from modem It becomes the volume for sound control by external resistance change. Gain is 0 dB at maximumvolume. 54 25.2 kΩ Mix Mix Audio signal R-channel input 0dB Mix 25.2 kΩ Beep input Vol.out audio signal 0 dB 9 25.2 kΩ 6 10 Mix 25.2 kΩ External volume Vol.out audio signal 0dB 11 R-channel 8 VREF SDC00056AEB 17 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 of 1 to 1. Signals are detected by separate systems to prevent cancellation in the case of negative phase input for main signal R-channel and L-channel. Main audio signal L-channel Main audio signal R-channel Beep signal Signal from PCcard Signal from modem 2) Signal detection sensitivity can be adjusted with 10 kΩ external resistance connected between pin 50 and pin 51 or pin 38 and pin 39. 3) The signals input via pin 38 and pin 50 first undergo double-wave rectification, and then peak detection is performed using the external condensor connected to pin 21. 0.47 µF 10 kΩ Audio signal 52 L-channel input 51 50 10 kΩ Modem signal 54 input Signal detection Beep input 56 0.47 µF 10 kΩ Audio signal R-channel input PCcard input 6 39 38 10 kΩ 2 21 0.047 µF Note) Adjust the detection sensitivity using 10 kΩ external resistance. If noise is high for the set, use more than 10 kΩ (between about 10 kΩ and 200 kΩ). 18 SDC00056AEB AN12941A ■ Application Notes (continued) 2. Signal detection system mix circuit block (continued) Detection sensitivity threshold values vs. external resistance Detection threshold value vs. resistance constant (L-channel) between pin 50 and pin 51 Detection threshold value (L-channel input level) (dBV) Detection threshold value (L-channel) −40 −50 −60 −70 1 10 100 1 000 Resistance constant (between pin 50 and pin 51) (kΩ) Power save of speaker power amplifier 1) When input signal level is lower than a certain value due to signal automatic detection circuit, power save of speaker power amp will be operated. 2) This automatic detecting function is able to stopped by pin 17. 3) When the automatic detection is off, it control manual control by pin 35. 4) Also when the automatic detection is on, manual power save on is prioritized. When it control only the automatic detecting function, set pin 35 to power save off. Signal detecting distinction output 1) The result of automatic signal detection is output from pin 22. VCC 51 17 50 Automatic signal detection function on/off VCC Signal detection 39 38 21 0.047 µF SDC00056AEB 47 kΩ 22 Automatic signal detection monitor pin Power save of speaker power amplifier VCC 35 Power save on/off 19 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 amplifier can be reduced by adding external resistance in parallel between pin 12 and pin 13 or pin 44 and pin 45. When addition resistance is set to Rd (kΩ) 18 × (9 + Rd) Gd = 12.7 × (18 + 9 + Rd) Headphone 9 10 3 dB 12.7 kΩ AGC 11 18 kΩ 9 kΩ 8 VREF 13 +3 dB 12 +9 dB VCC 7 3 dB 12.7 kΩ 48 47 AGC 46 18 kΩ 9 kΩ 8 VREF Headphone 44 +3 dB 45 Rd 20 14 Rd Mute SDC00056AEB +9 dB 43 AN12941A ■ Application Notes (continued) 4. Signal detection system mix circuit block AGC detection 1) The signal inputted from pin 41 and pin 16 is rectified on both waves and then mixed with L + R. 2) The above signal is peak-detected by the external part of pin 40. External is giving double-detection constant. 3) When the voltage of pin 40 is equal or more than 0.7 V, AGC is on. 2.4 V 49 for setting AGC level +3 dB 44 43 AGC 41 36 +9 dB AGC detection AGC 18 on/off 40 +3 dB 13 14 AGC 16 +9 dB 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. Using identical input signals, VCC, VCC_SP = 5 V RL = 8 Ω ← AGC off ← AGC on SDC00056AEB 21 AN12941A ■ Application Notes (continued) 5. Speaker amplifier circuit block DC shift circuit 1) Shift circuit operating point of signal (bias voltage at a no signal) from VREF to VREF_SP. DC voltage (speaker output) of output becomes VREF_SP. Speaker amplifier 1) Speaker amplifier is BTL amplifier system of 2-channel. Power save −10 dBV 43 41 50 kΩ 30 DC shift 0 dB 0 dB 31 33 VREF 0 dB 4 Ω to 8 Ω Out-L (SP) 32 Power save −10 dBV 14 16 50 kΩ 26 DC shift 0 dB 0 dB 27 24 VREF 0 dB Muted in sync with power save of speaker amplifier. 4 Ω to 8 Ω Out-R (SP) 25 An operating point is shifted from VREF to VREF_SP. 6. Control order at power supply on/off chcange Power supply on When switching power on, it is recommended to use a speaker amplifier during a transient period from power on till a stable condition of a circuit to ensure that a circuit start up smoothly by protecting from any shock noise of a speaker circuit. 1) Control order 1. Power supply (VCC_SP, VCC): Change off to on 2. Standby control: Change on to off 3. Speaker amplifier power save control: Change on to off 22 SDC00056AEB AN12941A ■ Application Notes (continued) 6. Control order at power supply on/off change (continued) Power supply on (continued) 2) Control timing VCC_SP (Pin 28, pin 29) Time difference would not cause any abnormality at VCC_SP and VCC atart up VCC (Pin 1) Standby reset after VCC_SP and VCC reach normal voltage Standby control (Pin 5) Time difference: Equal to or more than 1.0 sec *1 Speaker pawer save control (Pin 35) Power supply on Standby control reset (Control voltage: Change low to high) Speaker pawer save control reset (Control voltage: Change low to high) Note) *1: Time covering from standby control cancellation until a circuit stabilization to normal state. It depends on the capacitance connected to reference voltage (VREF, VREF_SP) pin. It is recommendation value of 4.7 µF. Power supply off When switching power off, it is recommended to take the order of first applying power save control to a speaker amplifier so that a circuit transient change may not effect on a speaker output. 1) Control order 1. Speaker amplifier power save control: Change off to on 2. Standby control: Change off to on 3. Power supply (VCC_SP, VCC): Change on to off SDC00056AEB 23 AN12941A ■ Application Notes (continued) 6. Control order at power supply on/off chcange (continued) Power supply off (continued) 2) Control timing VCC_SP (Pin 28, pin 29) Time difference would not cause any abnormality at VCC_SP and VCC atart down VCC (Pin 1) Standby control (Pin 5) Time difference: Equal to or more than 100 msec Speaker pawer save control (Pin 35) Time difference: Equal to or more than 100 msec Speaker pawer save control on (Control voltage: Change high to low) Standby control on (Control voltage: Change high to low) Power supply off After power supply start up (Usual operating condition) Shock noise is likely to occur if you switch a standby control without applying a speaker power save. Therefore, do not forget to apply speaker save before switching to standby control. 7. Power dissipation of package HSOP056-P-0300A PD Ta 5.000 4.280 Power dissipation PD (W) 4.000 Mounted on four layers of stndard board (50 × 50 × 0.8 mm3) Rth(j-a) = 29.2°C/W 3.000 Mounted on stndard board (50 × 50 × 0.8 mm3) Rth(j-a) = 79.5°C/W 1.572 2.000 1.000 0.862 Independent IC without a heat sink Rth( j-a) = 144.9°C/W 0.000 0 25 50 75 100 125 150 Ambient temperature Ta (°C) Note) The above characteristic is a reference value in case of design and is not a guarantee value. 24 SDC00056AEB AN12941A ■ 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, VCC = 3.3 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, R-out = 8 Ω, HPF: 400 Hz, LPF: 30 kHz SDC00056AEB 25 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, VCC = 5.0 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz 26 SDC00056AEB AN12941A ■ 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, VCC = 3.3 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz SDC00056AEB 27 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, VCC = 3.3 V, VCC_SP = 5.0 V, Input level = −22 dBV 28 SDC00056AEB AN12941A ■ 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, VCC = 5.0 V, VCC_SP = 5.0 V, Input level = −16 dBV SDC00056AEB 29 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, VCC = 3.3 V, VCC_SP = 5.0 V, Input level = −22 dBV 30 SDC00056AEB AN12941A ■ 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, VCC = 3.3 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, R-out = 8 Ω, HPF: 400 Hz, LPF: 30 kHz SDC00056AEB 31 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, VCC = 3.3 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, R-out = 8 Ω, HPF: 400 Hz, LPF: 30 kHz 32 SDC00056AEB AN12941A ■ 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, VCC = 3.3 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz SDC00056AEB 33 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, VCC = 5.0 V, VCC_SP = 5.0 V, Input level = −10 dBV 34 SDC00056AEB AN12941A ■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (1) SP output level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V, Vin = −22 dBV Input frequency = 1 kHz, RL = 8 Ω, HPF: 400 Hz, LPF: 30 kHz SDC00056AEB 35 AN12941A ■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (1) SP output level, distortion characteristics (R-channel, L-channel) (continued) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V, Vin = −22 dBV Input frequency = 1 kHz, RL = 4 Ω, HPF: 400 Hz, LPF: 30 kHz 36 SDC00056AEB AN12941A ■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (2) SP maximum output level characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V Input frequency = 1 kHz, RL = 8 Ω, HPF: 400 Hz, LPF: 30 kHz SDC00056AEB 37 AN12941A ■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (3) SP − AGC output level characteristics (R-channel, L-channel) AGC = On, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V, P36 = 1.05 V Vin = −6 dBV, Input frequency = 1 kHz, RL = 8 Ω, HPF: 400 Hz, LPF: 30 kHz 38 SDC00056AEB AN12941A ■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (4) Mix amplifier output level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP power save, VCC_SP = 5.0 V Vin = −10 dBV, Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz SDC00056AEB 39 AN12941A ■ Application Notes (continued) Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (5) Signal detection threshold value (R-channel, L-channel) AGC = Off, Automatic detection = On, VCC_SP = 5.0 V Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz 40 SDC00056AEB 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 technical information described in this material and controlled under the "Foreign Exchange and Foreign Trade Law" is to be exported or taken out of Japan. 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