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| ICs for Audio Common Use AN7191NZ Dual 20 W BTL audio power amplifier s Overview The AN7191NZ is an audio power IC developed for the sound output of car audio (dual 20 W). It is incorporating various protective circuits to protect the IC from destruction by GND-open short circuit to GND and power supply surge which are the important subject of power IC protection, so the IC will largely contribute to a high reliability design of equipment. Also, it is incorporating a perfect muting circuit which is free from shock noise, so that a shock noise design under the set transient condition can be made easily using together with its standby function. 18.000.30 13.500.30 1.500.10 Unit : mm 4.000.20 3.600.10 1 1.27 0.50+0.20 -0.10 15 (0.61) (1.80) (2.54) 2.400.50 R0.55 (1.95) 0.25+0.15 -0.05 s Features * BTL 20 W x 2-channel (4 ), GV = 34 dB * Built-in various protection circuits (thermal protection, short circuit to VCC and short circuit to GND, VCC-open short circuit to VCC , GND-open short circuit to GND, overvoltage and supply surge, and ASO, etc.) Especially, the supply surge breakdown voltage is 100 V or more. GND open breakdown voltage is 16 V or more. * Built-in standby function (free from shock noise at standby on/off) * Built-in muting function Free from shock noise at mute-on/off. Adapting attenuator method so that abnormal sound due to waveform deformation is not generated. Attack time, recovery time are 50 ms or less. * Reduction in external components It eliminates the need for NF and BS electrolytic capacitors. Muting function is not required, and power supply choke coil is unnecessary. * Provided with beep sound input pin * 2 load guaranteed 19.000.30 19.300.30 HZIP015-P-0745A s Applications * Car audio 13.250.30 15.650.50 18.950.50 10.00.30 3.250.10 1 AN7191NZ s Block Diagram ICs for Audio Common Use Ripple filter 12 Ref. 14 13 Att. Protection cct. Att. Ch.1 GND Ch.1 out (-) 3 4 1 VCC Ch.2 GND Ch.2 out (-) Ch.1 out (+) 2 Att. 10 6 5 8 Att.con. 11 7 Att. 9 15 Ch.2 out (+) Beep in Ch.1 in Standby Mute GND (sub) Ch.2 in s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 Description Power supply Ch.1 output (+) Grounding (output ch.1) Ch.1 output (-) Standby Ch.1 input Muting Grounding (sub) Pin No. 9 10 11 12 13 14 15 Description Grounding (input) Beep sound input Ch.2 input Ripple filter Ch.2 output (-) Grounding (output ch.2) Ch.2 output (+) s Absolute Maximum Ratings Parameter Supply voltage *2 *3 Symbol VCC Vsurge ICC Rating 25 80 9.0 59 -30 to +85 -55 to +150 GND (input) Unit V V A W C C Peak supply voltage Supply current Power dissipation *4 PD *1 Operating ambient temperature Storage temperature Note) *1 : *2 : *3 : *4 : *1 Topr Tstg Ta = 25C except power dissipation, operating ambient temperature and storage temperature. Without signal Time = 0.2 s Ta = 85C 2 ICs for Audio Common Use s Recommended Operating Range Parameter Supply voltage Symbol VCC Range 8.0 to 18.0 AN7191NZ Unit V s Electrical Characteristics at VCC = 13.2 V, freq. = 1 kHz, Ta = 25C Parameter Quiescent current Standby current Output noise voltage Voltage gain 1 Total harmonic distortion 1 Maximum output power 1 Ripple rejection ratio Channel balance Cross-talk *1 *1 *1 Symbol ICQ ISTB VNO GV1 THD1 PO1 RR CB CT VOFF MT Zi GV2 THD2 PO2 VS THD3 Conditions VIN = 0 mV, RL = 4 VIN = 0 mV, RL = 4 Rg = 4.7 k, RL = 4 VIN = 40 mV, RL = 4 Po = 0.5 W, RL = 4 THD = 10%, RL = 4 RL = 4 , Rg = 4.7 k, Vr = 1 V[rms], fr = 1 kHz VIN = 40 mV, RL = 4 VIN = 40 mV, RL = 4 , Rg = 4.7 k Rg = 4.7 k, RL = 4 VIN = 40 mV, RL = 4 VIN = 0.3 VDC VIN = 40 mV, RL = 2 Po = 0.5 W, RL = 2 THD = 10%, RL = 2 RL = 4 , Rg = 4.7 k, VMUTE = 5 V, VSTB = on/off, 50Hz HPF-on VIN = 10 mV, fIN = 20 kHz, Rg = 4.7 k, RL = Min 32 16 60 55 - 250 70 22 32 16 - 100 Typ 120 1 0.22 34 0.07 18 72 0 65 0 82 28 34 0.1 24 0 0.10 Max 250 10 0.5 36 0.4 1 250 35 36 0.5 100 0.5 Unit mA A mV[rms] dB % W dB dB dB mV dB k dB % W mV[p-0] % Output offset voltage Muting effect *1 Input impedance Voltage gain 2 Total harmonic distortion 2 Maximum output power 2 Shock noise *2 Total harmonics distortion 3 Note) *1 : Measurement using a bandwidth 15 Hz to 30 kHz (12 dB/OCT) filter. *2 : For VSTB = on/off, change over the standby terminal by the voltages of 0 V and 5 V at the time shown in the right. Standby terminal voltage 5V 0V 120 ms 120 ms 3 AN7191NZ s Terminal Equivalent Circuits Pin No. 1 2 Equivalent circuit ICs for Audio Common Use Description Power supply connection pin Ch.1 output pin (+) : Ch.1 positive-phase output pin. DC voltage 13.2 V 6.6 V 1 Drive circuit Pre-amp. 2 Drive circuit 3 30 k VREF = 6.6 V 1.2 k GND (Output) : Grounding pin for ch.1 output. Pre-amp. Ch.1 output pin (-) : Ch.1 reverse-phase output pin. 0V 6.6 V 3 4 1 Drive circuit 4 Drive circuit 3 30 k VREF = 6.6 V 1.2 k Standby control pin : Standby changeover pin threshold voltage approx. 2.1 V. 5 5 10 k 900 6 200 6 Approx. Approx. 15 A 15 A 400 Ch.1 input pin : Ch.1 input signal applied pin input impedance 30 k. 0 mV to 10 mV 30 k 7 7 5 k Mute control pin : Mute changeover pin threshold voltage approx. 2.0 V. 4 ICs for Audio Common Use s Terminal Equivalent Circuits (continued) Pin No. 8 9 10 VREF = 2.1 V AN7191NZ Equivalent circuit 1.2 k 1.2 k 20 k 20 k 10 1.2 k VREF = 2.1 V Description GND (sub) : Being connected to substrate only. GND (input) : Ground pin for input. DC voltage 0V 0V 2.1 V 30 k 2 Beep sound input pin : Beep sound signal input pin. Input impedance 10 k. 15 1.2 k 30 k Ch.2 input pin : Ch.2 input signal applied pin. Input impedance 30 k. 1 mV to 10 mV 11 11 200 Approx. Approx. 15 A 15 A 400 30 k 12 30 k 12 1.2 mA 40 k VCC Ripple filter pin : Output current 3 mA to 10 mA. 13.0 V 200 A 13 1 Drive circuit Pre-amp. Ch.2 output pin (-) : Ch.2 reverse-phase output pin. 6.6 V 13 Drive circuit 15 30 k VREF = 6.6 V 1.2 k 14 GND (output) : Ground pin for ch.2 output. 0V 5 AN7191NZ s Terminal Equivalent Circuits (continued) Pin No. 15 1 Drive circuit Equivalent circuit Pre-amp. ICs for Audio Common Use Description Ch.2 output pin (+) : Ch.2 positive-phase output pin. DC voltage 6.6 V 14 Drive circuit 15 30 k VREF = 6.6 V 1.2 k s Usage Notes 1. Always attach an outside heat sink when using the chip. Note that, the outside heat sink must be fastened onto a chassis for use. 2. Connect the cooling fin to GND potential. 3. Avoid short circuit to VCC and short circuit to GND, and load short-circuit. 4. The temperature protection circuit will be actuated at Tj = approx. 150C, but it is automatically reset when the chip temperature drops below the above set level. 5. The overvoltage protection circuit starts its operation at VCC = approx. 20 V. 6. Take into consideration the heat radiation design particularly when VCC is set high or when the load is 2 . 7. When the beep sound function is not used, open the beep sound input pin (pin 10) or connect it to pin 9 with around 0.01 F capacitor. 8. Connect only pin 9 (ground, signal source) to the signal GND of the amplifier in the previous stage. The characteristics such as distortion, etc. will improve. s Technical Information * PD Ta curves of HZIP015-P-0745A P D Ta 120 113.6 100 Infinit heat sink Rth (j-c) = 1.1C/W Pth (j-a) = 68.3C/W Power dissipation PD (W) 80 60 59.5 1C/W heat sink 40.3 40 30.5 20.5 20 11.3 1.8 0 0 2C/W heat sink 3C/W heat sink 5C/W heat sink 10C/W heat sink Without heat sink 25 50 75 100 125 150 Ambient temperature Ta (C) 6 ICs for Audio Common Use s Technical Information (continued) [1] Main characteristics PO VCC 40 35 RL = 4 freq. = 1 kHz THD = 10% AN7191NZ PC , ICC PO 50 45 10 VCC = 13.2 V RL = 4 freq. = 1 kHz 9 8 7 6 ICC 5 4 3 PC 10 5 2 1 0 5 10 15 20 25 30 0 Output voltage PO (W) 30 25 20 15 10 5 0 Consumption power PC (W) 40 35 30 25 20 15 0 5 10 15 20 25 0 Supply voltage VCC (V) Output voltage PO (W) PO , THD VIN (RL = 4 ) 100 50 20 10 PO , THD VIN (RL = 2 ) 100 50 10 Total harmonic distortion THD (%) 2 1 THD 10 kHz PO THD 100 Hz 1 kHz VCC = 13.2 V RL = 4 freq. = 1 kHz 400 Hz HPF 30 kHz LPF 100 0.5 0.2 0.1 0.05 0.02 20 THD 10 kHz 2 1 0.5 10 5 2 1 0.5 0.2 0.1 1 10 10 5 2 1 0.5 0.2 0.1 1 10 100 THD 100 Hz 1 kHz PO VCC = 13.2 V RL = 2 freq. = 1 kHz 400 Hz HPF 30 kHz LPF 0.2 0.1 0.05 0.02 0.01 1 000 0.01 1 000 Input voltage VIN (mV) Input voltage VIN (mV) GV , PO freq. 10 THD freq. 25 5 0 Maximum output power PO (W) 34 dB GV Total harmonic distortion THD (%) 2 1 0.5 0.2 0.1 0.05 0.02 0.01 10 VCC = 13.2 V RL = 2 , 4 PO = 1 W 100 1k 10k 100k Voltage gain GV (dB) -1 -2 20 PO 15 VCC = 13.2 V RL = 4 PO = 1 W THD = 10 % 100 1k 10k 10 100k -3 -4 10 Frequency freq. (Hz) Frequency freq. (Hz) Total harmonic distortion THD (%) 5 5 Output power PO (W) Output power PO (W) Supply current ICC (A) 7 AN7191NZ s Technical Information (continued) [1] Main characteristics (continued) GV VCC V CC ICs for Audio Common Use THD VCC 10 5 CC 0 34 dB Total harmonic distortion THD (%) 2 1 0.5 0.2 0.1 0.05 0.02 0.01 VCC = 13.2 V RL = 4 freq. = 1 kHz VIN = 20 mV 400 Hz HPF 30 kHz LPF Voltage gain GV (dB) -1 -2 -3 -4 VCC = 13.2 V RL = 4 freq. = 1 kHz 400 Hz HPF 30 kHz LPF 0 5 10 15 20 25 0 5 10 15 20 25 Supply voltage VCC (V) Supply voltage VCC (V) VNO Rg 2.0 g VNO VCC 2.0 RL = 4 VIN = 0 mV Rg = 4.7 k Output end noise voltage VNO (mV) VCC = 13.2 V RL = 4 VIN = 0 mV 1.5 Output end noise voltage VNO (mV) 1.5 1.0 1.0 Wide band 0.5 Wide band 0.5 DIN audio 0 0 5 10 15 20 25 DIN audio 0 10 100 1k 10k 100k Input impedance Rg () Supply voltage VCC (V) RR Vr 80 70 RR fr 80 70 Ripple rejection ratio RR (dB) Ripple rejection ratio RR (dB) 60 50 40 30 20 10 0 VCC = 13.2 V RL = 4 VIN = 0 mV Rg = 0 fr = 120 Hz DIN audio filter 1 10 100 1 000 10 000 60 50 40 30 20 10 0 10 100 1k 10k VCC = 13.2 V RL = 4 VIN = 0 mV Rg = 0 Vr = 1 V[rms] DIN audio filter Power supply ripple voltage Vr (mV[rms]) Power supply ripple frequency fr (Hz) 8 ICs for Audio Common Use s Technical Information (continued) [1] Main characteristics (continued) RR VCC 80 70 AN7191NZ CT VIN 80 70 60 Ripple rejection ratio RR (dB) 60 50 40 30 20 10 0 0 RL = 4 VIN = 0 mV Rg = 0 fr = 120 Hz Vr = 1 V[rms] DIN audio filter 5 10 15 20 25 Cross-talk CT (dB) 50 40 30 20 10 0 1 10 VCC = 13.2 V RL = 4 freq. = 1 kHz Rg = 4.7 k DIN audio filter 100 1 000 Supply voltage VCC (V) Input voltage VIN (mV) CT freq. 80 70 60 CT VCC 80 70 ch.2 ch.1 60 ch.2 ch.1 Cross-talk CT (dB) Cross-talk CT (dB) 50 40 30 20 10 0 10 100 1k VCC = 13.2 V RL = 4 Rg = 4.7 k DIN audio Filter 10k 50 40 30 20 10 0 RL = 4 VIN = 20 mV Rg = 4.7 k fr = 1 kHz DIN audio filter 0 5 10 15 20 25 Frequency freq. (Hz) Supply voltage VCC (V) ICQ VCC 200 VIN = 0 mV Rg = 0 RL = 4 ISTB VCC 20 VIN = 0 mV Rg = 0 RL = 4 Quiescent circuit current ICQ (mA) 150 15 100 Standby current ISTB (A) 10 50 5 ISTB 0 0 5 10 15 20 25 0 0 5 10 15 20 25 Supply voltage VCC (V) Supply voltage VCC (V) 9 AN7191NZ s Technical Information (continued) [1] Main characteristics (continued) ICQ VSTB 200 VCC = 13.2 V VIN = 0 mV Rg = 0 RL = 4 ICs for Audio Common Use VOFFSET VCC 100 VIN = 0 mV Rg = 0 RL = 4 Output offset voltage VOFFSET (mV) Quiescent circuit current ICQ (mA) 200 150 100 100 0 - 100 - 200 - 300 50 0 0 1 2 3 4 5 0 5 10 15 20 25 Standby terminal voltage VSTB (V) Supply voltage VCC (V) ME VIN 110 100 90 ME freq. 100 90 80 Muting effect ME (dB) 80 70 60 50 40 30 1 10 100 VCC = 13.2 V RL = 4 Rg = 4.7 k freq. = 1 kHz DIN audio filter 1k 10k Muting effect ME (dB) 70 60 50 40 30 20 10 100 1k VCC = 13.2 V RL = 4 Rg = 4.7 k PO = 1 W DIN audio filter 10k 100k Input voltage VIN (mV[rms]) Frequency freq. (Hz) ME VCC 100 90 80 100 90 80 ME VMUTE RL = 4 Rg = 4.7 k freq. = 1 kHz PO = 1 W DIN audio filter A 60 50 40 30 20 7 A Muting effect ME (dB) Muting effect ME (dB) 70 B 70 60 50 40 30 20 0 5 10 15 20 25 RL = 4 Rg = 4.7 k freq. = 1 kHz PO = 1 W DIN audio filter 4.7 k B 10 0 0 1 2 3 10 F 4 5 Supply voltage VCC (V) Mute terminal voltage VMUTE (V) 10 ICs for Audio Common Use s Technical Information (continued) [2] Application note AN7191NZ 1. Standby function Terminal state Terminal voltage Power 1) The power can be turned on or off by making pin 5 (standby terminal) high or low. Open 0V Standby state 2) The standby terminal has threshold voltage of Low 0 V to 1.0 V Standby state approx. 2.1 V, however, it has temperature deHigh Higher than 3 V Operating state pendency of approx. - 6 mV/C. The recommended range of use is shown in table 1. Table 1 3) The internal circuit of standby terminal is as shown in figure 1. When the standby terminal is high, the current approximately expressed by the following equation will flow into the circuit. 5V VSTB 0V 5 10 k RF Protection circuit Constant current source Sub ISTB = VSTB-2.7 V [mA] 10 k 3.5 k 3.5 k 3.5 k 3.5 k Figure 1 4) A power supply with no ripple component should be used for the control voltage of standby terminal. 2. Oscillation countermeasures 1) In order to increase the oscillation allowance, connect a capacitor and a resistor in series between each output terminal and GND as shown in figure 2. 2) The use of polyester film capacitor having a little fluctuation with temperature and frequency is recommended as the 0.22 F capacitor for oscillation prevention. 1 2,4 13,15 To speaker 0.22 F 2.2 3,14 Figure 2 11 AN7191NZ s Technical Information (continued) [2] Application note (continued) ICs for Audio Common Use 3. Input terminal 1) The reference voltage of input terminal is 0 V. When the input signal has a reference voltage other than 0 V potential, connect a coupling capacitor (of about several F) for DC component cut in series with the input terminal. Check the low-pass frequency characteristics to determine the capacitance value. 2) 10 k or less of signal source impedance Rg can reduce the output noise voltage. 3) The output offset voltage fluctuates when the signal source impedance Rg is changed. A care must be taken when using the circuit by directly connecting the volume to the input terminal. In such a case, the use of coupling capacitor is recommended. 4) If a high frequency signal from tuners enters the input terminal as noise, insert a capacitor of approx. 0.01 F between the input terminal and input GND. When a high frequency signal is inputted, malfunction of protective circuits may occur. 15 A 15 A 1 F Input signal 0.01 F 6 11 4.7 k 200 400 Attenuator To power 30 k Figure 3 4. Ripple filter 1) In order to suppress the fluctuation of supply voltage, connect a capacitor of approx. 33 F between RF terminal (pin 12) and GND. 2) Relation between RR (ripple rejection ratio) and a capacitor The larger the capacitance of a ripple filter is, the better the ripple rejection becomes. 3) Relation between the rise time of circuit and a capacitor The larger the capacitance of a ripple filter is, the longer the time from the power-on (standby : high) to the sound release becomes. 4) The DC voltage of output terminal is approximately the middle point of the ripple filter terminal voltage. 5) The internal circuit of ripple filter terminal is as shown in figure 4 and the charge current is approx. 3 mA to 10 mA. 12 ICs for Audio Common Use s Technical Information (continued) [2] Application note (continued) 4. Ripple filter (continued) VCC 30 k Constant current source Protection circuit AN7191NZ 12 33 F 200 A 20 k 20 k 1.2 mA VREF 3.5 k 3.5 k Figure 4 6) After power off (STB-low), it takes about 10 seconds or less for the total circuit current to become the standby current (10 A or less). In order to reduce the inspection time at the set, insert the resistor of approx. 47 k between the ripple filter terminal and GND. This can shorten the time to reach the standby current. 5. GND terminal _ _g 1) Be sure to short-circuit each GND terminal of pin 3, pin 8, pin 9 and pin 14 at the outside 1 3 8 9 14 of the IC when use. 2) For each GND terminal, the onepoint earth, referenced to the GND connection point of electrolytic capacitor between the To GND of input supply terminal and GND, is Figure 5 most effective for reducing the distortion. Even in the worst case, ground pin 8, pin 9 of input GND separately from all the other GND terminals. 3) Each GND terminal is not electrically short-circuited inside. Only pin 8 is connected with the substrate. 4) Pin 9 is input signal GND. Connect only pin 9 with Pre-GND. 6. Cooling fin 1) The radiation fin is not connected with GND terminal by using Au wire. Only pin 8 is electrically connected through the substrate. 2) Always attach an outside heat sink to the cooling fin. The cooling fin must be fastened onto a chassis for use. Otherwise, IC lead failure may occur. 3) Do not give the cooling fin any potential other than the GND potential. Otherwise, it may cause breakdown. 4) Connection of the cooling fin with GND can reduce the incoming noise hum. (It is not necessary to connect with GND in use, but connect with the power GND when connect with GND.) 13 AN7191NZ s Technical Information (continued) [2] Application note (continued) ICs for Audio Common Use 7. Shock noise 1) STB on/off No shock noise is released. However, the changeover switch of the standby terminal may make a slight shock noise. In such a case, insert a capacitor of approx. 0.01 F between the standby terminal and GND. 2) Mute on/off No shock noise is released. Refer to the section on the mute function. 8. Mute function 1) The mute-on/off is possible by making pin 7 (the muting terminal) high or low. 2) The muting circuit is as shown in figure 6. The amplifier gain including attenuator block is given in the following equation : GV = I1 x 50 I2 Original gain From the above equation, the amplifier gain can be made as 0 time by setting I1 at 0 mA in muting. 3) The threshold voltage of VMUTE is as follows : Mute-off : Approx. 1 V or less g Mute-on : Approx. 3 V or less I1 I2 Mute/On 5V VMUTE 0V Mute/Off 4.7 k Input 7 5 k I1 I2 Output stage 10 F Output stage Attenuator block I1 = approx. 120 A I2 = approx. 120 A Figure 6 4) Attack time and recovery time can be changed by the external CR of pin 7. For recommended circuits (figure 7. 4.7k, 10 F), the above mentioned times are as follows : Attack time : Approx. 30 ms Recovery time : Approx. 40 ms However, the control voltage of V MUTE is assumed to be 5 V. When it is not directly controlled by microcomputer (5 V), (13.2 V separate power supply), it is necessary to change CR values because the above times change. 5) When the attack time and recovery time are set at 20 ms or less, pay attention to the IC with larger output offset because it may release the shock noise. 9. Voltage gain The voltage gain is fixed at 34 dB and can not be changed by the addition of an external resistor. 14 ICs for Audio Common Use s Technical Information (continued) [2] Application note (continued) AN7191NZ 10. Beep sound input function 1) The application circuit using the beep sound input is shown in figure 7. Connect the beep signals from the microcomputer to pin 10 via the capacitor C1 for DC cut and the resister R1 for voltage gain adjustment. 2) The voltage gain of beep sound terminal is approx. 3.4 dB. With settings shown in the following drawing, it is approx.-12.7 dB (f = 1 kHz). 3) The beep sound is outputted to output terminals pin 2 and pin 15 only. VREF = 2.1 V Beep input C1 47 k 10 1.2 k 28 dB 2 20 k 20 k 1.2 k 28 dB 0.022 F R1 VREF = 2.1 V 15 600 GV = x 25 20 k + 1 200 1/jC1 + R1 + 2 Figure 7 11. Two IC use Figure 8 shows the application circuit example when two ICs are used : 4.7 k 2 200 F Out(RR) Power supply 11 13 15 1 3 5 7 9 Standby 2.2 k 0.22 F 0.22 F 2.2 2.2 Out(FR) 10 12 Mute 22 F 14 2 4 6 8 47 F 4.7 k In(RR) In(FR) In(RL) In(FL) S-GND 1 F 1 F 0.22 F 0.22 F 2.2 2.2 Out(RL) 11 1 F 13 15 1 3 5 7 9 1 F 0.22 F 0.22 F 2.2 2.2 Out(FL) 10 12 0.022 F In(FL) 47 k 14 2 4 6 8 0.22 F 0.22 F 4.7 k Figure 8 2.2 2.2 15 AN7191NZ s Technical Information (continued) [2] Application note (continued) ICs for Audio Common Use 11. Two IC use (continued) 1) Supply terminal Short-circuiting each other, insert an electrolytic capacitor of approx. 2 200 F into the supply terminals. However, if sufficient characteristics of the ripple rejection can not be obtained, use an even larger capacitor or insert a 2 200 F capacitor into each IC. The best sound quality can be obtained by inserting a 2 200 F capacitor near the terminal of each IC. 2) Standby terminal (pin 5) The connection of standby terminals with each other does not result in an abnormal operation. Connect with the microcomputer after connecting the standby pins with each other. At that time, the current flowing into the standby terminal is twice larger the current which is described in 1. Standby function. 3) Muting terminal (pin 7) It does not result in the abnormal operation even if the muting terminals are short-circuited with each other. The muting time constant changes when two ICs connection is made. If the CR constants are set at twice and 1/2 time respectively, the time constant value becomes as same as the value when 1 IC is used. 4) Beep sound input terminal (pin 10) Short-circuit between the beep sound input terminals does not result in an abnormal operation. However, if there is a temperature difference between ICs, there may be a fluctuation of the output offset. In order to avoid such a phenomenon, connect the ICs with each other through a resistor (47 k). 5) Ripple filter terminal (pin 12) Short-circuit between ripple filter terminals does not result in an abnormal operation. However, if the standby of each IC is individually controlled, the short-circuiting is not allowed. Use the circuit after connecting a capacitor (33 F) to each IC. s Application Circuit Example 12 Ripple filter Ch.1 GND 3 Ch.1 out (-) 4 1 VCC 14 Ch.2 GND 13 Ch.2 out (-) Ch.1 out (+) 2 Beep in 10 Standby 5 Ch.2 in 11 6 7 8 Ch.1 in Muting 9 15 Ch.2 out (+) 16 |
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