Ordering number: EN5205A Monolithic Linear IC LA4820M Monaural Speaker/Stereo Headphone Power Amplifier Overview The LA4820M compound power IC is designed for portable information processing equipment, such as electronic book players and personal notebook computers, and provides on chip headphone stereo amplifier and monaural speaker amplifier functions required of such devices. This system IC also provides on chip a power-saving headphone jack plug-in/out detection function, which automatically switches the amplifiers, and an optimum volume level controller. Package Dimensions unit : mm 3112-MFP24S [LA4820M] Features Functions c Monaural BTL power amplifier c Headphone OCL power amplifier (16 Ω) × 2 c Output control functions: Headphone power PVSS Monaural power Non-clipping circuit and output limiter c Headphone jack plug-in/out detection function (monaural amplifier/headphone amplifier switching) c Ripple filter c Power mute switch c Common amplifier on/off switching SANYO : MFP24S Allowable power dissipation, Pd max − mW c Power-saving headphone jack plug-in/out detection function on chip that electronically switches between the stereo headphone amplifier and the monaural BTL amplifier according to jack plug-in/out. c The monaural amplifier has, as output control functions, a built-in output limiter that permits adjustment in accordance with the speaker impedance and a non-clipping circuit that outputs a sine wave suited to the output D range, while the headphone amplifier has a built-in user-friendly PVSS (Peak Volume Select System). c On-chip ripple filter with a high ripple rejection ratio in order to reduce power line noise. c Less external components needed thanks to system and circuit technology, and low-capacitance design (22 µF or less) allowing support for chip components. Sanyo recommended board Independent IC Ambient temperature, Ta − °C SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 22896HA(II) No.5205-1/20 LA4820M Specifications Maximum Ratings at Ta = 25 °C Parameter Maximum supply voltage Allowable power dissipation Symbol Conditions Ratings Unit VCC1,2 max 8.0 V Pd max 580 mW 1.1 W With Sanyo evaluation board (84.2 × 92.6 mm2) Operating temperature Topr –20 to +75 °C Storage temperature Tstg –40 to +150 °C Operating Conditions at Ta = 25 °C Parameter Symbol Recommended supply voltage Conditions Ratings VCC1 Operating voltage range Unit 6.0 V VCC1 op 2.5 to 7.2 V VCC2 op 2.0 to 7.2 V Operating Characteristics at Ta = 25 °C, VCC1 = 6.0 V, fi = 1 kHz, 0.775 V = 0 dBm, RL = 16 Ω: monaural amplifier, RL = 16 Ω : headphone amplifier Parameter [Total] Quiescent current Symbol ICCO1 ICCO2 ICCO3 Ri Input resistance [Monaural Amplifier] Output power PO1 Voltage gain (closed) VG1 Total harmonic distortion THD1 Output noise voltage VNO 1 Ripple rejection ratio Rr1 DC offset voltage VOFF1 [Non-clipping + Monaural Amplifier] Output power PO2 Total harmonic distortion THD2 [Output Limiter + Monaural Amplifier] Output power PO3 Total harmonic distortion THD3 [Headphone Amplifier] Output power PO4 Voltage gain (closed) VG2 Total harmonic distortion THD4 Interchannel crosstalk CT Output noise voltage VNO2 Ripple rejection ratio Rr2 DC offset voltage VOFF2 [PVSS + Headphone Amplifier] PVSS voltage VO PVSS distortion factor THD5 PVSS start input VOPi PVSS width WPVSS [Ripple Filter] Output voltage VRF Ripple rejection ratio Rr3 Conditions min typ max Unit 7.0 5.5 4.0 10 11.5 9.0 6.3 13 21.0 14.0 10.0 16 mA mA mA kΩ THD = 10%, pin 12 connected to GND VO = 0 dBm PO = 100 mW Rg = 0 Ω, BPF = 20 to 20 kHz Rg = 0 Ω, Vr = −10 dBm, fr = 100 Hz Between pin 19 and pin 21 500 36.0 760 39.0 0.1 170 77 0 Vi = 0 dBm Vi = 0 dBM 300 Vi = 0 dBm, output limiter input resistance 220 Ω Vi = 0 dBm, output limiter input resistance 220 Ω Rg = 0 kΩ, monaural amplifier Rg = 0 kΩ, headphone amplifier Headphone common amplifier off +80 mW dB % µV dB mV 450 1.2 2.0 mW % 120 200 0.5 300 1.2 mW % THD = 10% VO = –10 dBm PO = 1 mW VO = –5 dBm, Rg = 0 Ω Rg = 0 Ω, BPF = 20 to 20 kHz Rg = 0 Ω, Vr = −10 dBm, fr = 100 Hz Between pin 15 and pin 16, and pin 16 and pin 17 30 15.3 120 18.3 0.1 39 16 92 0 Vi = –30 dBm, PVSS2 Vi = –30 dBm, PVSS2 PVSS2 Input width from the starting point to the point where the output is +4 dB, PVSS ON –39 IRF = 300 mA, 2SB1295 hFE6 used Vr = –10 dBm, fr = 100 Hz, IRF = 300 mA, 2SB1295 hFE6 used 60 –80 30 70 –40 –59 –36 0.25 –55 28 35 5.30 5.49 30 34 42.0 1.0 300 +40 mW dB % dB µV dB mV –33 1.6 –51 dBm % dBm 21.3 0.5 35 dB 5.70 V dB No.5205-2/20 LA4820M Block Diagram No.5205-3/20 LA4820M Test Circuit Diagram No.5205-4/20 LA4820M Sample Application Circuit 1 *1 A Tantalum capacitor is recommended. *2 A polyester film or ceramic capacitor (of which capacitance specified must be independent of temperature changes) is recommended. No.5205-5/20 LA4820M Sample Application Circuit 2 (When neither ripple filter nor common amplifier is used.) *1 A Tantalum capacitor is recommended. No.5205-6/20 LA4820M Pin Description * When the pin voltage is for VCC1 = 6.0 V Pin No. Pin name Pin voltage [V] 5.5 Internal equivalent circuit Remarks 1 R.F REF (Ripple Filter) 2 PWR MUTE 1.2 c Power mute is turned on when pin 2 is pulled down. c Turns on and off supply of constant current to the power block. 3 MONO IN 2.8 c BTL power input pin. c Input resistance 9 kΩ. 4 MIX OUT 2.8 c IN1 and IN2 addition output pin. c Output resistance 5 kΩ. 5 6 IN1 IN2 2.8 c Power input pins. c Input resistance can be varied between 14 kΩ and 4 kΩ by ALC. c LPF pin for ripple filter reference bias. c Ripple rejection ratio can be adjusted through an external capacitor. c Open when no ripple filter is needed. Continued on next page. No.5205-7/20 LA4820M Continued from preceding page. Pin No. 7 8 Pin Name PRE GND VREF Pin Voltage Internal equivalent circuit 2.8 Remarks c Connects small-signal block to GND. c Virtual ground bias pin. c Impedance is lowered by VREF amplifier. (ro = 10 Ω or less) c VREF voltage is determined by the following formula: VREF = VCC2 voltage (pin 22) (V) 2 VREF 9 VREFREF 2.8 c LPF pin for VREF amplifier reference bias. 10 REF 5.1 c LPF pin for internal ripple filter reference bias. c Voltage of VCC2 − 0.4 V. 11 PWRC CONT 0.8 c HzP Power is such that the common amplifier turns off and the output common capacitor mode is entered when pin 11 is pulled down. 12 DET OUT 0.5 to 1.0 c PVSS, output limiter, non-clipping circuit ALC rectification pin. c The attack and recovery time are determined by the external capacitance and resistance. Continued on next page. No.5205-8/20 LA4820M Continued from preceding page. Pin No. 13 Pin Name PVSS IN Pin Voltage 2.8 Internal equivalent circuit Remarks c PVSS detection input pin. c PVSS turns off when pulled down or left open. 14 MONO/HzP CONT 0.6 c Switches to HzP when pin 14 is pulled down (connected to GND through 1 MΩ). c The external capacitance and resistance is for mode switching smoothing. 15 17 OUT2 OUT1 2.3 c HzP Power output pin. 16 OUTC 2.3 c HzP Power COMMON pin. c Turns off when pin 11 is pulled down. 18 PWR GND c Connects power amplifier output block to GND. Continued on next page. No.5205-9/20 LA4820M Continued from preceding page Pin No. 19 21 Pin Name OUT− OUT+ Pin Voltage 2.3 Internal equivalent circuit Remarks c MONO Power output pin. c BTL operation provides phase inversion and amplitude. 20 LEVEL DET IN 2.9 c MONO Power output level detection input pin. c Output limiter level can be varied by external resistance. 22 VCC2 5.5 c Ripple filter output pin. c Power supply pin when no ripple filter is used. c Amplifier block VCC pin. Inside IC 23 BASE 5.4 c Tr base grounding pin for ripple filter. c Left open when no ripple filter is needed. 24 VCC1 6.0 c Ripple filter VCC pin. c Left open when no ripple filter is needed. No.5205-10/20 LA4820M Sanyo Evaluation Board Pattern Surface (silk side) Tone block (copper foiled side) Unit (resistance: Ω, capacitance: F) Copper foiled side No.5205-11/20 LA4820M Description of External Components (Refer to Sample Application Circuit No. 1 for device numbers.) c R1 (∞ to 40 kΩ): Resistor for ripple filter reference bias. Not needed when no ripple filter is used. Resistance VCC1 − VCC2 None 1.17 V 150 kΩ 0.73 V 75 kΩ 0.52 V 40 kΩ 0.35 V The VCE voltage (VCC1 − VCC2) of the Tr can be adjusted by changing the resistance value. c R2 (270 kΩ to 100 kΩ): Resistor for smoothing (shock noise prevention) when power mute is turned on. c R3, R4 (30 kΩ to 10 kΩ): Volume. c R5 (5.1 MΩ to 510 kΩ): Resistor for PVSS, output limiter, and non-clipping circuit recovery. c R6 (510 kΩ to 0 Ω): PVSS output level variable resistor. Not needed when using no PVSS. Resistance PVSS VO None −36 dBm 100 kΩ −25 dBm 300 kΩ −18 dBm c R7 (1 MΩ): Pull-down (discharging) resistor for SP/HzP switching. c R8 (270 kΩ): Pull-up (charging) resistor for SP/HzP switching. c R9, R10 (510 kΩ to 10 kΩ): HzP output mixing resistors for PVSS. Not needed when using no PVSS. c R11 (2.2 Ω): Resistor for blocking common amplifier oscillation. Not needed when the common amplifier is turned off. c R12 (510 kΩ to 0 Ω): Output limiter level variable resistor. Not needed when no output limiter is used. Resistance PO 400 kΩ 400 mW 300 kΩ 290 mW 220 kΩ 200 mW 100 kΩ 110 mW 0 43 mW The limiter level can be adjusted by changing the resistance value. c Q1: Ripple filter output Tr (2SB1295 hFE6 recommended). Not needed when using no ripple filter. c C1 (4.7 µF to 1.0 µF): LPF capacitor for the ripple filter reference bias. Low-region ripple rejection ratio can be varied by changing the capacitance. Not needed when using no ripple filter. Capacitance 100 Hz SVRR 1 kHz SVRR 4.7 µF 40 dB 60 dB 2.2 µF 34 dB 54 dB 1.0 µF 28 dB 48 dB c C2 (0.1 µF to 0.01 µF): Capacitor for smoothing (shock noise prevention) when power mute is turned off. c C3 (3.3 µF to 0.22 µF): Coupling capacitor for the MIX amplifier output and the BTL amplifier input. c C4 (100 µF to 0.1 µF): Decoupling capacitor for virtual grounding and high-region noise cleaning. c C5 (4.7 µF to 1.0 µF): LPF pin for VREF amplifier reference bias. Ripple rejection ratio can be varied by changing the capacitance. c C6 (22 µF to 3.3 µF): LPF capacitor for internal ripple filter reference bias. Ripple rejection ratio can be varied by changing the capacitance. c C7 (33 µF to 10 µF): ALC rectifying capacitor for PVSS, output limiter and non-clipping circuit. No.5205-12/20 LA4820M c C8 (0.33 µF to 0.1 µF): Coupling capacitor for PVSS detection input and HzP power output. Not needed when PVSS is not used. c C9 (0.1 µF to 0.01 µF): Capacitor for SP/HzP switching smoothing (charging/discharging). c C10 (0.47 µF to 2.2 µF): Capacitor for blocking common amplifier oscillation. Polyester film or ceramic capacitor (of which capacitance specified must be independent of temperature changes) is recommended. Not needed when common amplifier is turned off. c C11 (22 µF to 47 µF): Ripple filter output capacitor. Also functions as oscillation blocking capacitor. c C12 (220 µF to 10 µF): Power supply capacitor. * Use of a Tantalum capacitor is recommended for C11 and C12, because electrolytic capacitors cause the high-region impedance to increase at low temperatures. Description of Each System 1. Ripple filter c Used when the ripple level on the power line is high and a high ripple rejection ratio is needed in the amplifier block. When not needed, pins 1, 23 and 24 must be left open. (Refer to Sample Application Circuit 2.) c When using a ripple filter, the output Tr VCE voltage and the pin 1 C1 capacitance (LPF capacitor for the reference bias) must be adjusted according to the power supply ripple level. Power supply The VCE voltage must be adjusted to be ripple bottom peak voltage +0.1 V or more. 2. MONO amplifier block c Adds the channel 1 and channel 2 inputs and outputs the addition in single-channel BTL operation. c Non-clipping and output limiter circuits are built in as output control functions. 1) The output limiter detects the output level from the pin 20 detection input and controls the output level by means of ALC configuration. Adjust the level according to the speaker impedance, the power dissipation capability of the power supply, etc. If not needed, the pin 20 detection input must be left open. 2) The non-clipping circuit prevents large input-caused output clipping (degradation in sound quality). The detection input is connected internally, while the output level depends on the VCC2 voltage and is controlled by means of ALC configuration. 3. HzP amplifier block c Pin 11 (PWRC CONT) can be used to create a common amplifierless configuration. (This configuration is recommended when there is a possibility that the jack common pin may be shorted with GND in an application set.) c The output control function PVSS (Peak Volume Select System) controls the output level by means of ALC configuration (keeping user-friendly volume level, etc.); the level can be varied by an external resistor. Descriptional of Each Block Switching 1. Power mute switch c When an application set is microcomputer controlled, the power supply must be turned on/off with mute turned on in order to prevent shock noise. Even if an application set is not microcomputer controlled, the mute-on time for power-on can be set by the capacitance of the external capacitor on pin 2. Mute-on time 6 Mute-on condition Capacitance × 0.75 V 1.5 µA VS2 % 0.1 V Pin 2 charging Mute time No.5205-13/20 LA4820M c An equivalent circuit for the mute circuit is shown on the previous page. If the power supply is turned on, the external capacitor is charged by the internal constant current; once the voltage reaches 0.75 V (the switching level), mute turns off and the pin 2 DC voltage stabilizes at approximately 1.2 V. To turn mute on, short through a resistor to pull down pin 2. In this way, smoothing is applied by using an external capacitor and resistor to prevent switching noise when mute is turned on/off. c The mute-on/off time during normal operation is as shown below. When 270 kΩ and 0.033 µF are used: Mute on Mute off Pin 2 charging Pin 2 discharging Mute-off time 6 8 ms Mute-on time 6 9 ms 2. Common amplifier control switch c When the headphone output is connected to other equipment, in an application set in which the common amplifier output (jack common pin) may be connected to GND causing overcurrent to flow from the common amplifier, it is necessary to turn off the common amplifier. In such an application, it is recommended to use the common capacitor scheme shown in Sample Application Circuit 2 where pin 11 is grounded to turn off the common amplifier. c An equivalent circuit for the switching circuit is shown below. c PWRC-off condition VS11 % 0.4 V 3. HzP/SP switch c This circuit uses a headphone jack with a switch to detect the headphone plug-in/out and automatically switch between the HzP amplifier and the MONO amplifier. When the HzP amplifier is operating, the MONO amplifier is turned off, and when the MONO amplifier is operating, the HzP amplifier is turned off. c Smoothing is applied by using an external capacitor and resistor in order to prevent switching shock noise. c Open HzP condition VS14 % 0.2 V to No.5205-14/20 LA4820M Quiescent current, ICCO − mA <Each pin voltage> VDC − V VCC2 pin 22 VREF pin 8 Output DC Pins 5 to 17 Pins 19 and 21 Supply voltage, VCC1 − V Voltage gain, VG − dB Voltage gain, VG − dB Supply voltage, VCC1 − V Supply voltage, VCC1 − V Without BPF to Total harmonic distortion, THD − % Frequency, fi − Hz Total harmonic distortion, THD − % VR.F pin 10 Supply voltage, VCC1 − V Crosstalk, CT − dB Total harmonic distortion, THD − % Frequency, fi − Hz BPF 400 to 30 kHz Output power, Po − mW Frequency, fi − Hz No.5205-15/20 Crosstalk, CT − dB Output power, PO − mW LA4820M Output noise voltage, VNO − µV Output on both channels Supply voltage, VCC1 − V Power dissipation, Pd − W Current dissipation, ICC − mA Supply voltage, VCC1 − V Supply voltage, VCC1 − V Ripple rejection ratio, SVRR − dB Ripple rejection ratio, SVRR − dB Output power, PO − mW TUNE used Frequency, fR − Hz Vi − dBm Output voltage, VO − dBm Total harmonic distortion, THD − % Output voltage, VO − dBm Supply voltage, VCC1, VCC2 − V BPF = 400 to 30 kHz used Depending on the impedance of coupling capacitor 0.22 µF. Frequency, fi − Hz No.5205-16/20 Voltage gain, VG − dB Output voltage, VO − dBm Total harmonic distortion, THD − % LA4820M Frequency, fi − Hz Total harmonic distortion, THD − % Voltage gain, VG − dB Supply voltage, VCC1 − V Upper clipping BPF = 400 to 30 kHz Frequency, fi − Hz Total harmonic distortion, THD − % Total harmonic distortion, THD − % Supply voltage, VCC1 − V BPF 400 to 80 kHz IN Supply voltage, VCC1 − V 10 kHz 1 kHz Output power, PO − mV Crosstalk, CT − dB Crosstalk, CT − dB Less upper D range Frequency, fi − Hz Supply voltage, VCC1 − V No.5205-17/20 Total harmonic distortion, THD − % Voltage gain, VG − dB Ripple rejection ratio, SVRR − dB used Supply voltage, VCC1 − V Voltage gain, VG − dB Ripple rejection ratio, SVRR − dB Output noise voltage, VNO − µV Current dissipation, ICC − mA Output power, PO − mW Supply voltage, VCC1 − V Supply voltage, VCC1 − V Frequency, fR − Hz Output on both channels Current dissipation, Pd − W LA4820M Output power, PO − mW used Supply voltage, VCC1, 2 − V Frequency, fi − Hz Output power, PO − mW No.5205-18/20 Output voltage, PO − mW Total harmonic distortion, THD − % LA4820M Non-clipping Output limiter Frequency, fi − Hz Output noise voltage, VNO − µV Ripple rejection ratio, SVRR − dB Supply voltage, VCC1 − V used Frequency, fR − Hz open Non-clipping Output limiter Non-clipping Output limiter Nonclipping Output limiter BPF = 400 to 30 kHz Total harmonic distortion, THD − % Output limiter BPF = 400 to 30 kHz Total harmonic distortion, THD − % Output power, PO − mW Output voltage, VO − dBm Pin 12 GND Output power, PO − mW Non-clipping Vi − dBm Power dissipation, Pd − W Supply voltage, VCC1, 2 − V Supply current, ICC1 − mA Ripple rejection ratio, SVRR − dB Supply voltage, VCC1 − V Supply voltage, VCC1 − V No.5205-19/20 LA4820M VRF (VCC2) − V Supply voltage, VCC1 − V SVRR, VRF (VCC2) − IRF VRF (VCC2) − V 2SB1295 hFE6 IRF − mA Ripple rejection ratio, SVRR − dB Frequency, fR − Hz 2SB1295 hFE6 Ripple rejection ratio, SVRR − dB Ripple rejection ratio, SVRR − dB RDET − Ω Ripple rejection ratio, SVRR − dB BPF = 400 to 30 kHz Total harmonic distortion, THD − % Output power, PO − mW VRF (VCC2), SVRR − VCC1 VR − mV No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of February, 1996. Specifications and information herein are subject to change without notice. No.5205-20/20