LA4802

Ordering number : ENN6657 Monolithic Linear IC LA4802T Headphone Stereo Power Amplifier Overview 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. Package Dimensions unit: mm 3262-MSOP20 [LA4802T] 5.2 Functions • • • • 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.) 20 11 4.4 6.3 1 (0.35) 0.5 0.2 10 0.125 • • • • 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 Features SANYO: MSOP20 Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg When mounted, Ta = 80°C Conditions Ratings 4.5 375 –20 to +80 –40 to +150 Unit V mW °C °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 0.5 LA4802T Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Operating supply voltage range Recommended load resistance Symbol VCC VCC op RL Conditions Ratings 2.4 1.8 to 3.6 16 to 32 Unit V V Ω Electrical Characteristics at Ta = 25°C, VCC = 2.4 V, fIN = 1 kHz, RL = 16 Ω Item Quiescent current Symbol ICCO1 ICCO2 ICCO3 Operating current drain Voltage gain Channel balance Output power Total harmonic distortion Output noise voltage Crosstalk Ripple rejection ratio Peak output voltage Muting attenuation Power on voltage sensitivity Power off voltage sensitivity Mute on voltage sensitivity Mute off voltage sensitivity Boost on voltage sensitivity Boost off voltage sensitivity ICC1 VG ∆VG PO THD VNO CT SVRR VOBEEP VOFF V1 ON V1 OFF V20 ON V20 OFF V4 ON V4 OFF ICC2 THD2 VNO2 CT2 SVRR2 Conditions Current when ST is off (with L.B. on and muting off) Current when muting is on (with ST on and L.B. on) Current when ST is on (with L.B. on and muting off) PO = 0.1 mW (With 2 channels driven) VO = –10 dBm VO = –10 dBm THD = 10% VO = –8 dBm, 20 kHz LPF Rg = 10 kΩ, IHF A TUN1kHz, VO = –10 dBm fr = 100 kHz, Vr = –20 dBm, TUN100Hz VIN = 2.4 Vp-p, f = 1 kHz, MUTE OFF THD = 1%, TUN1kHz Power on threshold voltage Power off threshold voltage Muting on threshold voltage Muting off threshold voltage Boost on threshold voltage Boost off threshold voltage 1.4 1.4 0.5 0.5 70 60 1.0 –100 1.6 0.5 6.8 –1 25 Ratings min typ 0.05 530 950 3.2 7.8 0 38 0.03 –100 80 70 2.7 –120 0.1 –90 max 1 900 1500 3.7 8.8 +1 Unit µA µA µA mA dB dB mW % dBm dB dB mV dB V V V 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 Total harmonic distortion Output noise voltage Crosstalk Ripple rejection ratio VO = 0 dBm (With 2 channels driven) VO = 0 dBm, 20 kHz LPF Rg = 10 kΩ, IHF A TUN1kHz, VO = –10 dBm fr = 100 kHz, Vr = –20 dBm, TUN100Hz 80 65 1.5 0.005 –100 90 78 2.0 0.05 –90 mA % dBm dB dB Switch Threshold Voltages and Pin Influx Currents • Standby switch (pin 1) Pin influx current (µA) H : IC ON L : IC OFF 120 100 80 60 40 20 0 0 L H 1 2 V1 (V) 3 4 5 • Mute switch (pin 20), boost switch (pin 4) Pin influx current (µA) H : MUTE ON, L. B OFF L : MUTE OFF, L. B ON 40 30 20 L H 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 0.1 µF 0.47 µF 1 µF On time 0.2 ms 1 ms 2 ms Off time 9 ms 40 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 + Voltage gain, VG — dB 0 –2 –4 –6 –8 –10 –12 –14 Output pin Load terminal A13554 –16 10 No bas s co 100 mp ens atio Bas s n pe com nsat ion ap d plie 1000 1k 10k Frequency, f — Hz No. 6657-3/10 LA4802T Block Diagram and Test Circuit Vcc Vcc ON PW SW MT SW ON 1 OFF PW SW IN A MT SW OUT A 20 OFF C1 + 2 10kΩ 10kΩ 19 + C17 0.1µF 10Ω C18 10µF 220µF 16Ω A 3 Vcc R1 51kΩ C3 ON BST NF A Pre GND Boost SW 18 + 0.47µF C16 Vref A OFF + 4 Boost SW PWR GND 17 1µF C2 IN B OUT B + 5 10kΩ 10kΩ 16 + C14 0.1µF C15 10µF C4 Pre GND 1µF C5 + B 6 BST NF B 220µF R2 10Ω 16Ω MUTE C Vref OUT A 15 + 0.47µF C13 Vref B + Vcc 7 Vref OUT B Vref A L.B C 22µF 14 C12 + + - 220µF C6 Vcc + 8 Vref B 13 Vref CONT C + C11 2.2µF C10 22µF Beep IN C7 + 9 Beep R.F CONT 12 + 0.1µF R.F OUT 2.2µF C8 + 10 R.F 11 + C9 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 ON 1 OFF PW SW IN A MT SW 20 OFF OUT A + 10µF 2 10kΩ 10kΩ 19 0.1mF 10Ω A BST NF A + 220µF 16Ω 3 Pre GND Boost SW 18 + 1µF Vref A 4 Boost SW IN B PWR GND 17 OUT B + 10µF 5 10kΩ 10kΩ 16 0.1µF BST NF B + 220µF 10Ω 16Ω + Pre GND 1µF B 6 MUTE C Vref OUT A 15 VCC 7 Vref OUT B Vref A L.B C 14 220µF + + - Vcc + 22µF 8 Vref B 13 Vref CONT C + 2.2µF + 0.1µF 9 Beep IN Beep R.F CONT 12 + 2.2µF + 4.7µF R.F OUT 10 R.F 11 + 4.7µF * Package : MSOP-20 Top view No. 6657-6/10 LA4802T Pin Descriptions Pin No. Pin name Pin voltage (V) Pin description Equivalent circuit 1 POWER SW • IC on/off switch • 0 to 0.5 V: IC off • 1.4 to 4.5 V: IC on 1 20kΩ 300kΩ A13730 2 5 POWER IN 1.21 • Power input 2 5 1kΩ 10kΩ A13731 3 PRE GND • Bass compensation circuit on/off switch 4 BOOST SW • 0 to 0.5 V: Boost on • 1.4 to 4.5 V: Boost off 4 300Ω 200kΩ 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 100kΩ 11 RF CONT 2.15 • Ripple filter reference 11 300Ω 12kΩ 45kΩ 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 PWR NF 15 18 L. B NF 1.23 • Bass compensation circuit low-pass filter connection • The amount of bass boost depends on the capacitance used. 15 18 30kΩ 75kΩ 40kΩ 10kΩ PWR OUT A13740 16 19 POWER OUT 1.23 • Power outputs 16 19 15kΩ A13741 • Muting on/off switch 20 MUTE SW • 0 to 0.5 V: Muting off • 1.4 to 4.5 V: Muting on 200kΩ 100kΩ 20 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