Ordering number : ENA2040 LA4814JA Monolithic Linear IC 2-Channel Power Amplifier http://onsemi.com Overview The LA4814JA buili-in the power amplifier circuit capable of low-voltage (2.7V and up) operation and has additionally a standby function to reduce the current drain. It is a power amplifier IC optimal for speaker drive used in battery-driven portable equipment and other such products. Applications Mini radio cassette players/recorders, portable radios, transceivers and other portable audio devices Features • On-chip 2-channel power amplifier Output power 1 = 350mW typ. (VCC = 5.0V, RL = 4Ω, THD = 10%) Output power 2 = 150mW typ. (VCC = 3.6V, RL = 4Ω, THD = 10%) • Enables monaural BTL output system by changing externally connected components Output power 3 = 700mW typ. (VCC = 5.0V, RL = 8Ω, THD = 10%) Output power 4 = 320mW typ. (VCC = 3.6V, RL = 8Ω, THD = 10%) • Low-voltage operation possible VCC =2.7V and up • Standby function Current drain at standby = 0.1μA typ. (VCC = 5V) • Voltage gain setting possible Voltage gain = 3 to 20dB • Second amplifier stop control function Reducing the pop noise at startup (in BTL mode) Semiconductor Components Industries, LLC, 2013 May, 2013 32812 SY 20111215-S00001 No.A2040-1/16 LA4814JA Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Symbol Conditions Ratings Unit VCC max Allowable power dissipation Pd max Maximum junction temperature Tj max * 8 V 1.3 W 150 °C Operating temperature Topr -40 to +85 °C Storage temperature Tstg -40 to +150 °C * Mounted on Our evaluation board : Double-sided board with dimensions of 60mm × 60mm × 1.6mm Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Operating Conditions at Ta = 25°C Parameter Symbol Recommended supply voltage VCC Recommended load resistance RL Operating supply voltage range VCC op Conditions Ratings Unit 5 V Single ended mode 4 to 32 Ω BTL mode 8 to 32 Ω Single ended mode, RL = 6 to 32Ω 2.7 to 7 V 2.7 to 5.5 V 2.7 to 7 V 2.7 to 5.5 V Single ended mode, RL = 4 to 6Ω BTL mode, RL = 16 to 32Ω BTL mode, RL = 8 to 16Ω * Determine the supply voltage to be used with due consideration of allowable power dissipation. Electrical Characteristics at Ta = 25°C, VCC = 5.0V, RL = 4Ω, fin = 1kHz Ratings Parameter Symbol Conditions Unit min typ max Quiescent current drain ICCOP No signal 8.6 15 Standby current drain ISTBY No signal, V8 = Low 0.1 10 Maximum output power POMAX THD = 10% BTL maximum output power POMXB BTL mode, RL = 8Ω, THD = 10% Voltage gain VG VIN = -30dBV Voltage gain use range VGU Channel balance CHB VIN = -30dBV Total harmonic distortion THD VIN = -30dBV VNOUT Rg = 620Ω, 20 to 20kHz Channel separation CHSEP VOUT = -10dBV, 20 to 20kHz Ripple rejection ratio SVRR Reference voltage VOF 350 9.7 -2 -70 Rg = 620Ω, fr = 100Hz, Vr = -20dBV Rg = 620Ω, V3-V12, in BTL mode mW 11.2 dB 20 dB dB 0 2 0.35 1 % 15 50 μVrms -81 dBV 53 -30 VREF 0 dB 30 2.2 Pin 8 control HIGH voltage V8H (Power amplifier operation mode) Pin 8 control LOW voltage V8L (Power amplifier standby mode) Pin 9 control HIGH voltage V9H (Second amplifier standby mode) Pin 9 control LOW voltage V9L (Second amplifier operation mode) μA mW 700 8.2 3 Output noise voltage Output DC offset voltage 220 mA mV V 1.6 VCC 0 0.3 V V 1.6 VCC V 0 0.3 V No.A2040-2/16 LA4814JA Package Dimensions unit : mm (typ) 3179C Pd max - Ta 6.5 0.5 6.4 11 4.4 20 1 10 0.65 0.15 0.22 1.5max 0.1 (1.3) (0.33) Allowable power dissipation, Pd max - W 2.0 1.5 SANYO evaluation board (double-sided) 60mm×60mm×1.6mm 1.30 1.0 0.68 0.5 Independent IC 0.30 0.16 0 -40 -20 0 20 40 60 80 100 Ambient temperature, Ta - C SANYO : SSOP20(225mil) Pin Functions Pin Voltage Pin No. Pin Name Description 1 NC VCC = 5V - 2 NC - No connect 3 NC - No connect 4 GND 0 Ground pin 5 NC - No connect 6 OUT1 2.2 15 OUT2 No connect Equivalent Circuit Power amplifier output pin VCC VCC 6 15 GND 7 NC - No connect Continued on next page. No.A2040-3/16 LA4814JA Continued from preceding page. Pin Voltage Pin No. Pin Name 8 IN1 13 IN2 Description VCC = 5V 2.2 Equivalent Circuit Input pin VCC VCC 8 13 GND 9 NC - 10 VREF 2.2 No connect Ripple filter pin VCC (For connection of capacitor for filter) VCC 10 GND 11 STBY - Standby pin Standby mode at 0V to 0.3V Operation mode at 1.6V to VCC 11 GND 12 CNT - Second amplifier stop control pin Second amplifier operation at 0V to 0.3V Second amplifier stop at 1.6V to VCC 12 GND 14 NC - No connect 16 NC - No connect 17 VCC 5 Power supply pin 18 NC - No connect 19 NC - No connect 20 NC - No connect No.A2040-4/16 LA4814JA 14 4 5 6 11 STBY CONTROL + BIAS VCC 7 VREF + - NC OUT1 NC 3 NC NC 2 GND NC Power AMP-1 12 CNT NC Power AMP-2 1 13 IN2 15 IN1 NC 16 NC NC 17 OUT2 18 NC 19 VCC 20 NC Block Diagram 8 9 10 Test Circuit S4 out2 + + Power supply VCC = 5V S2 S1 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 Power supply Vsby = 1.5V + + out1 S3 Signal source fin = 1kHz No.A2040-5/16 LA4814JA from CPU Application Circuit Example 1. (2-channel single ended mode) IN2 VCC + + 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 + + IN2 Application Circuit Example 2. (monaural BTL mode) from CPU + from CPU VCC 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 + IN No.A2040-6/16 LA4814JA Cautions for Use 1. Input coupling capacitors (C1, C2) C1 and C2 are input coupling capacitors that are used to cut DC voltage. However, the input coupling capacitor C1 (C2) and input resistor R1 (R2) make up the high-pass filter, attenuating the bass frequency. Therefore, the capacitance value must be selected with due consideration of the cut-off frequency. The cut-off frequency is expressed by the following formula : fc = 1/2 π × R1 × C1 (= 1/2 π × R2 × C2) Note with care that this capacitance value affects the pop noise at startup. To increase this capacitance value, it is necessary to increase the capacitance value of pin 10 capacitor (C5) to soften the startup characteristics. 2. Pin 10 capacitor (C5) This capacitor C5 is designed for the ripple filter. Its purpose is to make up a low-pass filter with a 100kΩ internal resistor for reducing the ripple component of the power supply and improve the ripple rejection ratio. Inside the IC, the startup characteristics of the pin 10 voltage are used to drive the automatic pop noise reduction circuit, and care must be taken with the pop noise when the C5 capacitance value is to be set lower. However, when the IC is used in BTL mode, the automatic pop noise reduction function mentioned above has no effect. Instead, a pop noise reduction method that utilizes the second amplifier control function is used so that the capacitance value must be determined while factoring in the ripple rejection ratio or startup time. Recommended capacitance value : Min. 22μF (in 2-channel mode) 10μF (in mono BTL mode) 3. Bypass capacitor (C7) The purpose of the bypass capacitor C7 is to reject the high-frequency components that cannot be rejected by the power supply capacitor (chemical capacitor C6). Place the capacitor as near to the IC as possible, and use a ceramic capacitor with excellent high-frequency characteristics. 4. Standby function The standby function serves to place the IC in standby mode to minimize the current drain. a) When using the standby function (when using microcomputer control) By applying the following voltages to the standby pin (pin 11), the mode changeover can be performed between standby and operation. Operation mode … V11 ≥ 1.6V Standby mode … V11 ≤ 0.3V However, set the resistance of resistor R5 inserted in series in such a way that the condition in the following formula is met. R5 ≤ 24.6 × (Vstby - 1.6) kΩ R5 The pin 11 inrush current is expressed by the following formula: 11 STBY Vstby I11 = (40 × Vstby - 26.3)/(1+0.04 × R5) μA V11 Fig. 1 b) When not using the standby function (microcomputer control is not possible) By applying a voltage from the power supply (pin 17) to the standby pin (pin 11), the IC can be turned on without the control of the microcomputer when the power is turned on. In order to reduce the pop noise when the IC is turned off, it is recommended that resistor R5 be inserted as shown in Fig.2. The resistance value indicated below is recommended for the inserted resistor R5. VCC = 5.0V : R5 = 82kΩ VCC = 3.6V : R5 = 47kΩ VCC = 3.0V : R5 = 33kΩ VCC 17 VCC R5 11 STBY Fig. 2 No.A2040-7/16 LA4814JA 5.Second amplifier control function (only when BTL mode is used) The second amplifier control function is a function to reduce the startup pop-noise in BTL mode. The pop noise can be reduced by first turning on the IC while the second amplifier is stopped, then after the potential inside the IC gets stabilized, turning on the second amplifier. The values shown below are recommended for the control time. C5 [μF] 2.2 3.3 4.7 10 Twu [ms] 200 250 300 500 * Twu : Time after releasing standby to second amplifier turn-on a) When using microcomputer control The second amplifier can be controlled by applying the following voltages to pin 12. Second amplifier operation mode … V12 ≤ 0.3V Second amplifier stop mode … V12 ≥ 1.6V However, set the resistance value of the resistor R6 inserted in series in such a way that the condition in the following formula is met. R6 ≤ 16.2 × (Vcnt - 1.6) kΩ R6 The pin 12 injected current is expressed by the following formula : 12 CNT Vcnt I12 = (57.6 × Vcnt - 31.7)/(1+0.058 × R6) μA V12 Fig. 3 b) When microcomputer control is not possible When the microcomputer cannot be used, the second amplifier can be controlled by adding the external components as shown in Fig. 4. VCC (V) VCC 5 3.6 3 R7 (kΩ) 10 6.8 6.8 R9 (kΩ) 120 68 56 C8 (μF) 100 100 100 17 VCC R7 R9 12 CNT + C8 R5 11 STBY Fig. 4 6.Shorting between pins When power is applied with pins left short-circuited, electrical deterioration or damage may result. Therefore, check before power application if pins are short-circuited with solder, etc. during mounting of IC. 7.Load shorting If the load is left short-circuited for a long period of time, electrical deterioration or damage may occur. Never allow the load to short-circuit. 8.Maximum rating When IC is used near the maximum rating, there is a possibility that the maximum rating may be exceeded even under the smallest change of conditions, resulting in failure. Take sufficient margin for variation of supply voltage and use IC within a range where the maximum rating will never be exceeded. No.A2040-8/16 LA4814JA 9. Turn-off transient response characteristics If the IC is turned off and then turned back on while there is a potential difference between the pin 10 (reference voltage, plus input pin) and pins 8 and 15 (minus input pins), a louder pop noise than the one normally generated when power is switched on will be emitted. Therefore, in order to minimize the turn-on pop noise, smoothen the discharge of the input and output capacitors, and bring the potential of pin 10 and pins 8 and 15 to approximately the same level, then turn on the IC. a) Single ended mode When the continuous changeover of mode between standby and operation is necessary, it is recommended to insert a resistor between the output pins (pins 6 and 15) and ground to accelerate the turn-off transient response characteristic. The value shown below is recommended for the resistor used for discharge. In order to reduce pop noise, it is recommended that time necessary for turning the IC back on is greater than the following value. Recommended discharge resistor : R = 4.7kΩ (Recommended turn-on time : T = 600ms) PWR STBY STBY PWR 100ms/div OUT1 6 OUT:50mV/div,AC + - Vref + 8 IN1 10pin:1V/div,DC T b) BTL mode When the continuous changeover of mode between standby and operation is performed, it is recommended that the second amplifier control function be used to reduce the turn-on pop noise. If this function is used, the pop noise level can be reduced regardless of the time taken for the IC to turn on after it is turned off. For details on the time taken for the second amplifier to turn on after the IC is turned on, refer to Section 5 “Second amplifier control function.” No.A2040-9/16 LA4814JA General characteristics Single ended mode 6 4 2 0 2 4 6 1.0 7 5 3 2 2 3 5 6Ω R L= 8Ω R L= 4Ω Output power, PO – W 0.7 RL 0.6 2 3 5 7 2 0.1 3 5 7 Ω =4 RL =8 0.4 0.3 RL 0 2 1 Ω = 16 3 4 Pd – PO 1 VCC = 5V f = 1kHz 0.8 RL = 4Ω 0.6 0.4 RL = 8Ω RL = 16Ω 0.2 0 0.01 2 3 5 7 2 0.1 5 3 5 7 Pd – PO f = 1kHz RL = 4Ω 0.8 V 0.6 V CC 0.4 V CC 0.2 = 6V =5 = 3.6V V CC = 3V 0 0.01 1 CC V 2 3 Output power, PO – W 5 7 2 0.1 3 THD – f 1 R L= 3 2 – 20 =0 5 – 10 C1 7 C1 Voltage gain, Vg – dB R L= 4Ω R L =8 16 Ω Ω 1 0 C1 =0 .22 μF = 1 .0 .1μ μF F 10 2 VCC = 5V RL = 4Ω R1 = 10kΩ C3 = 470μF Vg = 10.4dB – 30 – 40 0.1 5 7 100 7 Vg – f 20 3 2 3 5 Output power, PO – W VCC = 5V PO = 10mW Vg = 10.4dB 10 7 6 Supply voltage, VCC – V Power dissipation, Pd – W Power dissipation, Pd – W 1 Ω 0.5 Output power, PO – W Total harmonic distortion, THD – % 7 0.1 0.1 0.01 5 5 0.2 3 2 7 3 0.8 1 7 5 10 2 0.1 f = 1kHz THD = 10% 0.9 3 2 1 7 PO – VCC 1.0 R L= 1 Total harmonic distortion, THD – % THD – PO 10 7 5 V CC =5 V V CC =6 V 2 Output power, PO – W VCC = 5V f = 1kHz 3 2 = 3 Supply voltage, VCC – V 100 7 5 3.6 3V 10.0 7 5 0.1 0.01 8 V RL = 4Ω f = 1kHz V CC = Total harmonic distortion, THD – % Supply current, ICCO – mA 8 0 THD – PO 100.0 RL = OPEN Rg = 0Ω V CC ICCO – VCC 10 2 3 5 7 1k 2 3 5 7 10k Frequency, f – Hz 2 3 5 7100k 10 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 5 7100k Frequency, f – Hz No.A2040-10/16 LA4814JA CH.Separation - f -40 VNO - VCC 20 18 Channel separation - dBV -50 16 14 -60 12 -70 10 8 CH1 2 -80 6 CH2 1 4 -90 2 -100 10 2 3 5 7100 2 3 5 7 1k 2 3 5 7 10k 2 3 0 2 5 7100k 3 4 Frequency, f - Hz SVRR - f 90 80 70 60 50 40 30 20 10 0 10 2 3 5 7 100 2 3 5 7 1k 2 3 6 7 SVRR - C5 70 Supply voltage ripple rejection, SVRR - dB Supply voltage ripple rejection, SVRR - dB 100 5 Supply voltage, VCC - V 5 7 10k 2 3 5 7100k 60 50 40 30 20 10 0 1 2 3 5 7 2 10 3 5 7 100 Frequency, f - Hz Mutting attenation - VIN -70 Mutting level - dBV -80 Mutting level - dBV Mutting attenation - f -70 -90 -80 -90 -100 -100 -110 -40 -110 -30 -20 -10 0 10 20 10 2 3 5 7 100 Input voltage, VIN - dBV 1.0 7 5 Total harmonic distortion, THD - % 3 2 VCC = 5 V VCC = 6V VC C = 3V VC C = 3. 6V Total harmonic distortion, THD - % 7 5 10 7 5 3 2 0.1 0.01 2 3 5 7 0.1 2 3 5 7 1 Output power, PO - W 5 7 1k 2 3 5 7 10k 2 3 5 7100k Frequency, f - Hz General characteristics BTL mode THD - PO 100 3 2 2 3 2 3 5 7 10 100 7 5 3 2 THD - PO VCC = 5V f = 1kHz Vg = 16.4dB 10 7 5 3 2 1.0 7 5 3 2 0.1 0.01 2 3 5 7 0.1 2 3 5 7 1 2 3 5 7 10 Output power, PO - W No.A2040-11/16 LA4814JA PO – VCC RL RL 0.50 = = Ω 16 6Ω 2Ω RL =3 0.25 0 2 3 4 5 6 C 0.6 V =5 VC 0.4 VCC 0.2 6V = 3. = 3V V CC 5 7 0.1 2 3 5 7 1 2 3 6Ω 3 5 7 0.1 2 3 5 7 1 2 5 3 2 0.1 Ω =6 R L 8Ω = RL 7 5 3 2Ω 2 RL 2 3 5 7 100 2 3 =3 5 7 1k 2 3 5 7 10k 18 16 C1 = 1.0μF 15 10 5 0 VCC = 5V RL = 8Ω VIN = -30dBV Vg = 16.4dB Rin = 10kΩ 14 –5 12 – 10 3 4 5 6 Supply voltage, VCC – V 7 10 Supply voltage ripple rejection, SVRR – dB 50 40 30 20 10 5 7 100 2 3 5 7 1k 2 3 5 7 10k Frequency, f – Hz 5 7 100 2 3 5 7100k PCA02350 2 3 5 7 1k 2 3 5 7 10k Frequency, f – Hz SVRR – f 2 3 2 3 PCA02348 VCC = 5V RL = 8Ω Vr = -20dBV C5 = 10μF Rg = 620Ω 0 10 5 7100k PCA02347 20 20 2 2 3 Vg – f 25 22 60 5 7 10 PCA02345 THD – f Frequency, f – Hz VNO – VCC 24 70 3 VCC = 5V RL = 8Ω PO = 10mW 10 Voltage gain, Vg – dB Output noise voltage, VNO – μVrms 5 7 10 PCA02346 10 Supply voltage ripple rejection, SVRR – dB 2 C1 =0 .22 =0 μF .1μ F 3 VCC = 5V RL = 8Ω Rg = 620Ω Din Audio 26 0.2 0.01 2 Output power, PO – W 28 8Ω Output power, PO – W Total harmonic distortion, THD – % 6V = V CC Power dissipation, Pd – W 0.8 = 6Ω =1 RL 2Ω RL = 3 7 1 30 0.4 1 f = 1kHz RL = 8Ω 0 0.01 RL PCA02344 Pd – PO 1.2 0.6 0 0.01 7 Supply voltage, VCC – V 0.8 R L= 16Ω 1.00 8Ω C1 Output power, PO – W = VCC = 5V f = 1kHz R L= RL 1.25 0.75 Pd – PO 1 f = 1kHz THD = 10% Power dissipation, Pd – W 1.50 2 3 5 7100k PCA02349 SVRR – C5 70 VCC = 5V RL = 8Ω Vr = -20dBV fr = 100Hz Rg = 620Ω 60 50 40 30 20 10 0 1 2 3 5 7 10 2 Capacitance, C5 – μF 3 5 7 100 PCA02351 No.A2040-12/16 LA4814JA Mutting attenation - VIN -50 Mutting level - dBV -60 Mutting level - dBV Mutting attenation - f -50 -70 -60 -70 -80 -80 second amplifier is shut down mode -90 -40 -30 -20 -10 -90 10 0 second amplifier is shut down mode 2 3 5 7 100 Input voltage, VIN - dBV nd 2 3 5 7100k 2 3 5 7100k out1-gnd -30 -40 -50 -60 -70 -30 -40 -50 -60 -70 t2 ou t1- ou -80 5 7 10k -20 Mutting level - dBV Mutting level - dBV out 2 3 Mutting attenation - f -10 1-g -20 5 7 1k Frequency, f - Hz Mutting attenation - VIN -10 2 3 -80 out1-out2 -90 -40 -90 -30 -20 -10 0 10 20 10 2 3 5 7 100 Input voltage, VIN - dBV 4 Reference voltage, VREF - V Supply current, ICCO - mA 9.5 9 8.5 8 7.5 0 50 3 2 1 0 100 50 Ambient temperature, Ta - C THD - Ta (SE) 10 THD - Ta (BTL) 7 Total harmonic distortion, THD - % Total harmonic distortion, THD - % 5 7 10k VREF - Ta 0 —50 100 7 5 3 2 1 7 5 3 2 0.1 —50 2 3 VCC = 5V Ambient temperature, Ta - C 10 5 7 1k Frequency, f - Hz Temperature characteristics ICCO - Ta 10 7 —50 2 3 0 50 Ambient temperature, Ta - C 100 5 3 2 1 7 5 3 2 0.1 —50 0 50 100 Ambient temperature, Ta - C No.A2040-13/16 LA4814JA Output power, PO – W 0.8 PO – Ta (SE) 1 VCC = 5V RL = 4Ω f = 1kHz THD = 10% 0.6 0.4 0.2 0.6 0.4 0 50 0 – 50 100 Ambient temperature, Ta – °C Vg – Ta (SE) 20 VCC = 5V RL = 4Ω f = 1kHz Vg = 10.4dB VIN = -20dBV 5 0 –5 – 50 0 50 Ambient temperature, Ta – °C 0 16 50 Ambient temperature, Ta – °C Voltage gain, Vg – dB Voltage gain, Vg – dB 10 VCC = 5V RL = 8Ω f = 1kHz THD = 10% 0.2 0 – 50 15 PO – Ta (BTL) 0.8 Output power, PO – W 1 100 Vg – Ta (BTL) 15 10 VCC = 5V RL = 8Ω f = 1kHz Vg = 16.4dB VIN = -20dBV 5 0 – 50 0 100 50 Ambient temperature, Ta – °C No.A2040-14/16 LA4814JA Pop noise Single ended mode : Turn-on transient response characteristic STBY PWR 200ms/div Single ended mode : Turn-off transient response characteristic PWR STBY OUT : 50mV/div, AC 1s/div OUT : 50mV/div, AC 10pin : 1V/div, DC 10pin : 1V/div, DC BTL mode: Turn-on transient response characteristic STBY PWR 100ms/div 6pin-15pin : 50mV/div, AC BTL mode: Turn-off transient response characteristic PWR STBY 500ms/div 6pin-15pin : 50mV/div, AC 10pin : 1V/div, DC 10pin : 1V/div, DC 12pin : 1V/div, DC No.A2040-15/16 LA4814JA Evaluation board 1. 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