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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
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 F or less) allowing support for chip components.
SANYO : MFP24S
Allowable power dissipation, Pd max - mW
Sanyo recommended board
Independent IC
Functions
c Monaural BTL power amplifier c Headphone OCL power amplifier (16 ) x 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
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 Operating temperature Storage temperature Symbol VCC1,2 max Pd max With Sanyo evaluation board (84.2 x 92.6 mm2) Topr Tstg Conditions Ratings 8.0 580 1.1 -20 to +75 -40 to +150 Unit V mW W C C
Operating Conditions at Ta = 25 C
Parameter Recommended supply voltage Operating voltage range Symbol VCC1 VCC1 op VCC2 op Conditions Ratings 6.0 2.5 to 7.2 2.0 to 7.2 Unit V V V
Operating Characteristics at Ta = 25 C, VCC1 = 6.0 V, fi = 1 kHz, 0.775 V = 0 dBm, RL = 16 : monaural amplifier, RL = 16 : headphone amplifier
Parameter [Total] Quiescent current Symbol ICCO1 ICCO2 ICCO3 Ri Conditions Rg = 0 k, monaural amplifier Rg = 0 k, headphone amplifier Headphone common amplifier off min 7.0 5.5 4.0 10 500 36.0 typ 11.5 9.0 6.3 13 760 39.0 0.1 170 77 0 450 1.2 200 0.5 120 18.3 0.1 39 16 92 0 -36 0.25 -55 35 max 21.0 14.0 10.0 16 Unit mA mA mA k mW dB % V dB mV mW % mW % mW dB % dB V dB mV dBm % dBm dB
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 [Ripple Filter] Output voltage Ripple rejection ratio WPVSS VRF Rr3
THD = 10%, pin 12 connected to GND VO = 0 dBm PO = 100 mW Rg = 0 , BPF = 20 to 20 kHz Rg = 0 , Vr = -10 dBm, fr = 100 Hz Between pin 19 and pin 21 Vi = 0 dBm Vi = 0 dBM Vi = 0 dBm, output limiter input resistance 220 Vi = 0 dBm, output limiter input resistance 220 THD = 10% VO = -10 dBm PO = 1 mW VO = -5 dBm, Rg = 0 Rg = 0 , BPF = 20 to 20 kHz Rg = 0 , Vr = -10 dBm, fr = 100 Hz Between pin 15 and pin 16, and pin 16 and pin 17 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 IRF = 300 mA, 2SB1295 hFE6 used Vr = -10 dBm, fr = 100 Hz, IRF = 300 mA, 2SB1295 hFE6 used
42.0 1.0 300 +80
60 -80 300
2.0 300 1.2
120
30 15.3 30 70 -40 -39 -59 28
21.3 0.5 35 +40 -33 1.6 -51
5.30 30
5.49 34
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. 1 Pin name R.F REF (Ripple Filter) Pin voltage [V] 5.5 Internal equivalent circuit Remarks 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.
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 k.
4
MIX OUT
2.8
c IN1 and IN2 addition output pin. c Output resistance 5 k.
5 6
IN1 IN2
2.8
c Power input pins. c Input resistance can be varied between 14 k and 4 k by ALC.
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 Remarks c Connects small-signal block to GND. c Virtual ground bias pin. c Impedance is lowered by VREF amplifier. (ro = 10 or less) c VREF voltage is determined by the following formula: VREF = VCC2 voltage (pin 22) (V) 2
2.8
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 M). 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: , 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 k): Resistor for ripple filter reference bias. Not needed when no ripple filter is used.
Resistance None 150 k 75 k 40 k VCC1 - VCC2 1.17 V 0.73 V 0.52 V 0.35 V
The VCE voltage (VCC1 - VCC2) of the Tr can be adjusted by changing the resistance value.
c R2 (270 k to 100 k): c R3, R4 (30 k to 10 k): c R5 (5.1 M to 510 k): c R6 (510 k to 0 ):
Resistor for smoothing (shock noise prevention) when power mute is turned on. Volume. Resistor for PVSS, output limiter, and non-clipping circuit recovery. PVSS output level variable resistor. Not needed when using no PVSS.
Resistance None 100 k 300 k PVSS VO -36 dBm -25 dBm -18 dBm
c R7 (1 M): c R8 (270 k): c R9, R10 (510 k to 10 k): c R11 (2.2 ): c R12 (510 k to 0 ):
Pull-down (discharging) resistor for SP/HzP switching. Pull-up (charging) resistor for SP/HzP switching. HzP output mixing resistors for PVSS. Not needed when using no PVSS. Resistor for blocking common amplifier oscillation. Not needed when the common amplifier is turned off. Output limiter level variable resistor. Not needed when no output limiter is used.
Resistance 400 k 300 k 220 k 100 k 0 PO 400 mW 290 mW 200 mW 110 mW 43 mW
The limiter level can be adjusted by changing the resistance value.
c Q1: c C1 (4.7 F to 1.0 F):
Ripple filter output Tr (2SB1295 hFE6 recommended). Not needed when using no ripple filter. 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 F 2.2 F 1.0 F 40 dB 34 dB 28 dB 60 dB 54 dB 48 dB
c C2 (0.1 F to 0.01 F): c C3 (3.3 F to 0.22 F): c C4 (100 F to 0.1 F): c C5 (4.7 F to 1.0 F): c C6 (22 F to 3.3 F): c C7 (33 F to 10 F):
Capacitor for smoothing (shock noise prevention) when power mute is turned off. Coupling capacitor for the MIX amplifier output and the BTL amplifier input. Decoupling capacitor for virtual grounding and high-region noise cleaning. LPF pin for VREF amplifier reference bias. Ripple rejection ratio can be varied by changing the capacitance. LPF capacitor for internal ripple filter reference bias. Ripple rejection ratio can be varied by changing the capacitance. ALC rectifying capacitor for PVSS, output limiter and non-clipping circuit. No.5205-12/20
LA4820M
c C8 (0.33 F to 0.1 F): c C9 (0.1 F to 0.01 F): c C10 (0.47 F to 2.2 F): Coupling capacitor for PVSS detection input and HzP power output. Not needed when PVSS is not used. Capacitor for SP/HzP switching smoothing (charging/discharging). 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. Ripple filter output capacitor. Also functions as oscillation blocking capacitor. 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.
c C11 (22 F to 47 F): c C12 (220 F to 10 F):
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 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. 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. The VCE voltage must be adjusted to be ripple bottom peak voltage +0.1 V or more.
2)
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 Capacitance x 0.75 V 1.5 A
Mute-on condition
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 k and 0.033 F are used: Mute off Pin 2 charging Pin 2 discharging Mute on
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
VCC2 pin 22 VR.F pin 10 VREF pin 8
VDC - V
Output DC
Pins 5 to 17 Pins 19 and 21
Supply voltage, VCC1 - V
Supply voltage, VCC1 - V
Voltage gain, VG - dB
Frequency, fi - Hz Total harmonic distortion, THD - % Total harmonic distortion, THD - %
Voltage gain, VG - dB
Supply voltage, VCC1 - V
BPF 400 to 30 kHz
Without BPF to
Frequency, fi - Hz Total harmonic distortion, THD - %
Supply voltage, VCC1 - V
Output power, Po - mW
Crosstalk, CT - dB
Frequency, fi - Hz No.5205-15/20
LA4820M
Supply voltage, VCC1 - V
Output power, PO - mW
Crosstalk, CT - dB
Supply voltage, VCC1 - V
Output on both channels
Output noise voltage, VNO - V
Current dissipation, ICC - mA
Power dissipation, Pd - W
Output power, PO - mW Ripple rejection ratio, SVRR - dB
Supply voltage, VCC1 - V
Ripple rejection ratio, SVRR - dB
used
TUNE used
Supply voltage, VCC1, VCC2 - V Total harmonic distortion, THD - %
Frequency, fR - Hz
Output voltage, VO - dBm
BPF = 400 to 30 kHz
Output voltage, VO - dBm
Depending on the impedance of coupling capacitor 0.22 F.
Vi - dBm
Frequency, fi - Hz No.5205-16/20
LA4820M
Total harmonic distortion, THD - % Supply voltage, VCC1 - V
Output voltage, VO - dBm
Voltage gain, VG - dB
Frequency, fi - Hz Total harmonic distortion, THD - %
Voltage gain, VG - dB
Upper clipping
BPF 400 to 80 kHz IN
Supply voltage, VCC1 - V Total harmonic distortion, THD - % Total harmonic distortion, THD - %
Frequency, fi - Hz
BPF = 400 to 30 kHz
10 kHz 1 kHz
Supply voltage, VCC1 - V
Output power, PO - mV
Less upper D range Crosstalk, CT - dB Crosstalk, CT - dB Frequency, fi - Hz
Supply voltage, VCC1 - V No.5205-17/20
Voltage gain, VG - dB
Ripple rejection ratio, SVRR - dB
Output noise voltage, VNO - V
Output power, PO - mW
Frequency, fR - Hz
Supply voltage, VCC1 - V
used
Supply voltage, VCC1 - V
Supply voltage, VCC1 - V
LA4820M
Total harmonic distortion, THD - %
Voltage gain, VG - dB
Ripple rejection ratio, SVRR - dB
Current dissipation, ICC - mA Output on both channels
Frequency, fi - Hz
Supply voltage, VCC1, 2 - V
Output power, PO - mW
used
Output power, PO - mW
No.5205-18/20
Current dissipation, Pd - W
LA4820M
Total harmonic distortion, THD - %
Output voltage, PO - mW Frequency, fi - Hz
Non-clipping Output limiter
Supply voltage, VCC1 - V Ripple rejection ratio, SVRR - dB
Output noise voltage, VNO - V
Supply voltage, VCC1 - V Ripple rejection ratio, SVRR - dB
Supply voltage, VCC1, 2 - V
Supply current, ICC1 - mA
Pin 12 GND
used
Frequency, fR - Hz Non-clipping Output voltage, VO - dBm Output limiter
BPF = 400 to 30 kHz
Output power, PO - mW Total harmonic distortion, THD - % Output power, PO - mW Total harmonic distortion, THD - %
Non-clipping
open
Output limiter
Nonclipping
Output limiter
Non-clipping Output limiter
BPF = 400 to 30 kHz
Vi - dBm
Supply voltage, VCC1 - V No.5205-19/20
Power dissipation, Pd - W
LA4820M
VRF (VCC2), SVRR - VCC1 Total harmonic distortion, THD - % Ripple rejection ratio, SVRR - dB IRF - mA No.5205-20/20 VRF (VCC2) - V
Output power, PO - mW
BPF = 400 to 30 kHz
RDET - Ripple rejection ratio, SVRR - dB Ripple rejection ratio, SVRR - dB
VRF (VCC2) - V
2SB1295 hFE6
Supply voltage, VCC1 - V SVRR, VRF (VCC2) - IRF
2SB1295 hFE6
Frequency, fR - Hz
Ripple rejection ratio, SVRR - dB
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.

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