Ordering number : ENN6657 Monolithic Linear IC LA4802T Headphone Stereo Power Amplifier Overview Package Dimensions The LA4802T is a headphone stereo power amplifier for portable CD and MD players. It features a high signal-tonoise ratio, a high ripple rejection ratio, low distortion, and low current drain. unit: mm 3262-MSOP20 [LA4802T] 5.2 0.5 4.4 Headphone stereo power amplifier Power switch Muting switch Beep tone function control input pin (The beep tone function can be used regardless of whether the mute function is on or off.) 11 1 (0.35) 10 0.125 0.2 0.5 Features High signal-to-noise ratio (100 dB typical at 7.5 µV) High ripple rejection ratio (70 dB typical) Low current drain (950 µA typical) On-chip bass compensation circuit (Compensates for bass frequency attenuation due to the output capacitors and achieves flat frequency characteristics.) • Ultraminiature package (MSOP-20) 0.08 (0.65) • • • • 0.85max • • • • 20 6.3 Functions SANYO: MSOP20 Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Allowable power dissipation Symbol Conditions Ratings VCC max Pd max When mounted, Ta = 80°C Unit 4.5 V 375 mW Operating temperature Topr –20 to +80 °C Storage temperature Tstg –40 to +150 °C Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein. SANYO Electric Co.,Ltd. Semiconductor Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 72502RM (OT) No. 6657-1/10 LA4802T Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings Unit Recommended supply voltage VCC Operating supply voltage range VCC op 1.8 to 3.6 V Recommended load resistance RL 16 to 32 Ω 2.4 V Electrical Characteristics at Ta = 25°C, VCC = 2.4 V, fIN = 1 kHz, RL = 16 Ω Item Symbol Conditions Quiescent current Ratings min typ Unit max ICCO1 Current when ST is off (with L.B. on and muting off) 0.05 1 ICCO2 Current when muting is on (with ST on and L.B. on) 530 900 µA ICCO3 Current when ST is on (with L.B. on and muting off) 950 1500 µA µA Operating current drain ICC1 PO = 0.1 mW (With 2 channels driven) 3.2 3.7 mA Voltage gain VG VO = –10 dBm 6.8 7.8 8.8 dB ∆VG VO = –10 dBm –1 0 +1 THD = 10% 25 38 Channel balance Output power PO dB mW Total harmonic distortion THD VO = –8 dBm, 20 kHz LPF 0.03 0.1 % Output noise voltage VNO Rg = 10 kΩ, IHF A –100 –90 dBm CT TUN1kHz, VO = –10 dBm 70 80 dB fr = 100 kHz, Vr = –20 dBm, TUN100Hz 60 70 dB 1.0 2.7 mV –100 –120 dB Crosstalk Ripple rejection ratio SVRR Peak output voltage VOBEEP VIN = 2.4 Vp-p, f = 1 kHz, MUTE OFF Muting attenuation VOFF THD = 1%, TUN1kHz Power on voltage sensitivity V1 ON Power on threshold voltage Power off voltage sensitivity V1 OFF Power off threshold voltage Mute on voltage sensitivity V20 ON Muting on threshold voltage Mute off voltage sensitivity V20 OFF Muting off threshold voltage 0.5 Boost on voltage sensitivity V4 ON Boost on threshold voltage 0.5 Boost off voltage sensitivity V4 OFF Boost off threshold voltage 1.6 V 0.5 1.4 V V 1.4 V V V Ta = 25°C, VCC = 2.7 V, fIN = 1 kHz, RL = 47 kΩ (Characteristics when used as a line output), L.B OFF Operating current drain ICC2 1.5 2.0 Total harmonic distortion THD2 VO = 0 dBm, 20 kHz LPF 0.005 0.05 % Output noise voltage VNO2 Rg = 10 kΩ, IHF A –100 –90 dBm CT2 TUN1kHz, VO = –10 dBm 80 90 dB fr = 100 kHz, Vr = –20 dBm, TUN100Hz 65 78 dB Crosstalk Ripple rejection ratio VO = 0 dBm (With 2 channels driven) SVRR2 mA Pin influx current (µA) Switch Threshold Voltages and Pin Influx Currents • Standby switch (pin 1) H : IC ON L : IC OFF 120 100 80 60 40 20 0 L 0 H 1 2 3 4 5 V1 (V) Pin influx current (µA) • Mute switch (pin 20), boost switch (pin 4) H : MUTE ON, L. B OFF L : MUTE OFF, L. B ON 40 30 H L 20 0 0 1 2 3 V20, V4 (V) 4 5 No. 6657-2/10 LA4802T Notes on the Beep Tone Output Function • This function provides a beep tone output under control of the system microcontroller. • The beep tone can be provided regardless of the on/off state of the muting function. • The recommended beep input signal level is a square wave with VIN = 2.4 Vp-p. When the muting function is off, the beep tone output, VOBEEP, will be 2.7 V rms, and when muting is on, the output will be 1.3 Vrms. Notes on the Muting Time • The muting on time and the muting off time can be modified by changing the value of the external capacitor C4 connected to pin 6. The recommended value for C4 is 1 µF. With lower values, impulse noise levels will increase. • The on/off times will change as shown below when the value of C4 is varied. C4 On time 0.1 µF 0.2 ms Off time 9 ms 0.47 µF 1 ms 40 ms 1 µF 2 ms 80 ms • We recommend operating the mute switch at the same time as the power on/off switch (pin 1) to minimize impulse noise at power on and off. VCC MUTE S. W PWR S. W A13553 Notes on the Bass Compensation Circuit • When the headphone load is connected to the output, the low frequencies will be attenuated due to the output capacitors. This circuit compensates for that attenuation and creates frequency response characteristics that are close to flat. • This function can be turned on or off from pin 4. When used as a line output, the load will be less than 16 Ω, and the bass frequency characteristics will be somewhat increased. Therefore we recommend leaving the bass compensation circuit off in this case. VG — f 2 Output pin Load terminal –8 n mp –4 –6 ap ens atio s Bas pe com bas s co Voltage gain, VG — dB –2 ion nsat 0 No + d plie –10 –12 –14 A13554 –16 10 100 1000 1k 10k Frequency, f — Hz No. 6657-3/10 LA4802T Block Diagram and Test Circuit Vcc Vcc ON PW SW MT SW PW SW 1 ON MT SW 20 OFF C1 OFF OUT A IN A + 19 2 10µF 10kΩ 10kΩ + C17 0.1µF C18 220µF 16Ω 10Ω BST NF A A 3 Vcc OFF R1 51kΩ C3 ON C16 + 18 Pre GND Vref A 0.47µF Boost SW + Boost SW 4 PWR GND 17 1µF C2 OUT B IN B + 16 5 10µF 10kΩ C4 B + Pre GND 6 1µF C5 + 10kΩ + C14 0.1µF 220µF R2 10Ω BST NF B + 15 MUTE C C13 Vref OUT A 7 14 Vref OUT B C12 + 8 + 9 Beep IN Vref B 13 Vref CONT C Beep 12 + Vcc + C11 2.2µF C10 + 2.2µF 0.1µF C8 + L.B C 22µF C7 Vref B Vcc Vref A 220µF + 16Ω 0.47µF 22µF C6 C15 R.F CONT R.F OUT 10 R.F C9 11 + 4.7µF 4.7µF * Package : MSOP-20 Top view No. 6657-4/10 LA4802T External Components (Values in parentheses are recommended values.) • C1, C2 (1 to 10 µF) Input coupling capacitors. • C3 (0.47 to 2.2 µF) Boost switch on/off impulse noise reduction capacitor. • C4 (1 µF) Mute switch on/off impulse noise reduction capacitor. • C5, C6 (10 to 22 µF) Reference bias (VREF) decoupling capacitors. • C7 (0.1 to 1 µF) Beep input coupling capacitor. Be careful not to attenuate the beep tone signal. • C8, C9 (2.2 to 4.7 µF) Ripple filter capacitors. • C10 (2.2 to 4.7 µF) Reference bias (VREF) decoupling capacitors. • C11 (1 to 2.2 µF) Boost switch on/off impulse noise reduction capacitor. • C12 (220 µF) Power supply line decoupling capacitor. • C13, C16 (0.47 µF) Low pass filter capacitor in the bass boost circuit. The amount of bass boost depends on the value of this capacitor. • C14, C17 (0.1 µF) Output oscillation prevention capacitors. We recommend using Mylar capacitors. Since the oscillation stability varies depending on the PCB layout and other factors, we recommend a value of at least 0.1 µF for these capacitors. • C15, C18 (220 to 470 µF) Output capacitors. Low band attenuation increases with lower capacitances. • R1 (24 to 51 kΩ) Smoothing resistor for the boost switch on/off transition. Note that using a smaller value will increase the idling current when the boost switch is off. • R2, R3 (10 Ω) Output oscillation prevention resistors. No. 6657-5/10 LA4802T Application that does not use the line outputs (The bass compensation circuit is always on.) Vcc Vcc ON PW SW MT SW PW SW 1 ON MT SW 20 OFF OFF OUT A IN A + + 19 2 10µF 10kΩ 10kΩ 220µF 0.1mF 16Ω 10Ω BST NF A A 3 + 18 Pre GND Vref A 1µF Boost SW PWR GND Boost SW 4 OUT B IN B + 17 + 16 5 10µF 10kΩ 220µF 0.1µF 10kΩ 16Ω 10Ω + Pre GND BST NF B B 6 15 MUTE C 1µF Vref OUT A 7 VCC Vref A 14 + 220µF + Vref OUT B 8 Vref B 13 + 2.2µF 9 Beep IN Vref CONT C Beep 12 0.1µF + Vcc - L.B C 22µF + + + 2.2µF R.F CONT R.F OUT 10 R.F 11 + 4.7µF 4.7µF * Package : MSOP-20 Top view No. 6657-6/10 LA4802T Pin Descriptions Pin name 1 POWER SW Pin voltage (V) Pin description • IC on/off switch • 0 to 0.5 V: IC off • 1.4 to 4.5 V: IC on Equivalent circuit 1 20kΩ 300kΩ Pin No. A13730 2 5 POWER IN 1.21 • Power input 2 1kΩ 5 10kΩ A13731 3 PRE GND 4 BOOST SW • Bass compensation circuit on/off switch 4 • 0 to 0.5 V: Boost on 300Ω 200kΩ • 1.4 to 4.5 V: Boost off A13732 10kΩ 6 MUTE C 1.27 • Connection for the mute switch on/off impulse noise reduction capacitor 6 300Ω A13733 7 8 VREF OUT 1.21 • VREF amplifier reference 7 8 10kΩ A13734 Continued on next page. No. 6657-7/10 LA4802T Continued from preceding page. Pin No. Pin name Pin voltage (V) Pin description Equivalent circuit 300Ω 300Ω 9 BEEP IN 1.21 • Beep input 9 2.5kΩ 2.5kΩ A13735 10 RF OUT 2.15 • Ripple filter output 10 300Ω A13736 RF CONT 2.15 • Ripple filter reference 11 12kΩ 45kΩ 100kΩ 11 300Ω A13737 10kΩ 12 VREF CONT C 1.21 • VREF amplifier reference 12 13kΩ A13738 100kΩ 13 L. B C 1.33 • Connection for the bass compensation circuit switch on/off impulse noise reduction capacitor 13 300Ω A13739 14 VCC Continued on next page. No. 6657-8/10 LA4802T Continued from preceding page. Pin No. Pin name Pin voltage (V) Pin description Equivalent circuit 15 L. B NF 1.23 18 • Bass compensation circuit low-pass filter connection • The amount of bass boost depends on the capacitance used. 30kΩ PWR NF 15 75kΩ 18 40kΩ 10kΩ PWR OUT 16 19 POWER OUT 1.23 A13740 16 • Power outputs 15kΩ 19 MUTE SW • 0 to 0.5 V: Muting off • 1.4 to 4.5 V: Muting on 20 200kΩ • Muting on/off switch 20 100kΩ A13741 A13742 No. 6657-9/10 LA4802T Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer’s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer’s products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification” for the SANYO product that you intend to use. 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 July, 2002. Specifications and information herein are subject to change without notice. PS No. 6657-10/10