Ordering number:ENN3534 Monolithic Linear IC LA4571MB Low-voltage Headphone Amplifier for Stereo Audio Overview Package Dimensions The LA4571MB is a low-voltage, stereo headphone amplifier incorporating both tape head preamplifiers and headphone power amplifiers in a single chip, making it ideal for portable battery-powered equipment. It features logic-level controlled output signal muting, excellent noise characteristics and easy interconnection with signal sources, such as an AM/FM tuner IC. The LA4571MB requires no input or output coupling capacitors. A buffer amplifier with 10 output impedance reduces the size of the virtual-earth decoupling capacitor. The preamplifier and power amplifier inputs only require the addition of an external capacitor to provide high-frequency noise filtering. The LA4571MB operates from a 3V supply and is available in 20-pin MFPs. unit:mm 3036B-MFP20 [LA4571MB] 1.8 max 10 1 0.15 7.6 0.1 1.5 12.6 0.625 5.4 6.35 11 20 0.35 1.27 0.59 SANYO : MFP20 Features * Stereo tape head preamplifiers and headphone power amplifiers on chip. * Output signal muting. * Low noise. * 8 speaker driver. * 3V supply. * 20-pin MFP. Specifications Maximum Ratings at Ta = 25C Parameter Supply voltage Allowable power dissipation Symbol Conditions Ratings VCC max Pd max Unit 4.5 V 400 mW Operating temperature Topr -20 to +75 C Storage temperature Tstg -40 to +125 C Recommended Operating Conditions at Ta = 25C Parameter Supply voltage Symbol Conditions Ratings VCC Supply voltage range VCC op Unit 3.0 V 1.8 to 3.6 V 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 40500TN (KT)/3271TS (US) No.3534-1/9 LA4571MB Electrical Characteristics Preamplifier and power amplifier at Ta = 25C, VCC=3.0V, f=1kHz, RL (pre)=10k, RL (power)=16, 0dBm at 0.775V unless otherwise noted Parameter Symbol Quiescent supply current ICCO Total voltage gain VGT Conditions Rg=2.2k, VI=0V VO=-5dBm Ratings min 65 typ max Unit 17 27 mA 68 71 dB Preamplifier at Ta = 25C, VCC=3.0V, f=1kHz, RL (pre)=10k, RL (power)=16, 0dBm at 0.775V unless otherwise noted Parameter Symbol Conditions Open-loop voltage gain VGO VO=-5dBm Closed-loop voltage gain VG1 VO=-5dBm Maximum output voltage VO max Total harmonic distortion THD1 Ratings min 70 THD=1%, VCC=1.8V VO=0.2V, VG=40dB (NAB standard) 0.1 typ max Unit 80 dB 40 dB 0.2 V 0.05 0.5 % 1.3 2.0 V VNI CT1 Rg=2.2k, bandwidth=20Hz to 20kHz Channel crosstalk Rg=2.2k, 1kHz tune 60 80 dB Ripple rejection Rr1 Rg=2.2k, VCC=1.8V, Vr=-20dBm, f=100Hz 40 50 dB Input conversion noise voltage Power amplifier at Ta = 25C, VCC=3.0V, f=1kHz, RL (pre)=10k, RL (power)=16, 0dBm at 0.775V unless otherwise noted Parameter Output power Symbol Conditions Ratings min typ max PO VG2 THD=10% 23 32 Closed-loop voltage gain VO=-5dBm 25 28 31 Total harmonic distortion THD2 PO=1mW 0.4 1.0 Channel crosstalk CTT VO=-5dBm, RV=0 Output noise voltage VNO Rg=0, BPF=20Hz to 20kHz Ripple rejection Rr2 Ri Rg=0, Vr=-20dB, f=100Hz, VCC=1.8V Input resistance Output DC offset voltage VODC off 30 24 60 22 30 -90 mW 40 45 Unit dB % dB 40 V 38 k +90 mV dB Note : The maximum and minimum values for the power amplifiers closed-loop voltage gain (VG2) increase by 1dB when the load resistance (RL) is 32. Block Diagram No.3534-2/9 LA4571MB Pin Assignment Top view Pin Description Number Name 1 PRE GND Description Preamplifier ground 2 IN1 Channel 1 preamplifier input 3 NF1 Channel 1 preamplifier negative feedback input 4 PRE OUT1 Channel 1 preamplifier output 5 SW OUT1 Channel 1 preamplifier mute-control switched output RIN 500k 6 POWER IN1 Channel 1 power amplifier input. RIN30k 7 PRE MUTE Preamplifier mute control 8 RF REF 9 VCC 10 POWER GND 11 COMMON 12 OUT1 Channel 1 power amplifier output 13 OUT2 Channel 2 power amplifier output 14 POWER MUTE 15 POWER IN2 16 SW OUT2 Channel 2 preamplifier mute-control switched output. RIN 500k 17 PRE OUT2 Channel 2 preamplifier output 18 NF2 19 IN2 20 VREF Ripple-filter capacitor connection Supply voltage Power amplifier ground Common amplifier output Power amplifier mute control Channel 2 power amplifier input. RIN30k Channel 2 preamplifier negative feedback input Channel 2 preamplifier input Referecne-voltage amplifier output. Imax=500A No.3534-3/9 LA4571MB ICCO - VCC Pd max - Ta Quiescent supply current, ICCO - mA Allowable power dissipation, Pd max - mW Test Circuit Supply voltage, VCC - V Ambient temperature, Ta - C THD - VO Voltage gain, VG - dB Total harmonic distortion, THD - % VGO, VG - f Frequency, f - Hz Output voltage, VO - V No.3534-4/9 LA4571MB VO max - VCC Open-loop voltage gain, VGO - dB Maximum output voltage, VO max - V VGO - VCC Supply voltage, VCC - V Supply voltage, VCC - V VNO - VCC Channel crosstalk, CT - dB Output noise voltage, VNO - V CT - f Supply voltage, VCC - V Output level, VO - dBm VO - f Frequency, f - Hz Supply voltage rejection ratio, SVRR - dB Frequency, f - Hz SVRR - VCC Supply voltage, VO - V Reference voltage, Vref - V Vref - IO Output current, IO - mA No.3534-5/9 LA4571MB VDC - VCC DC voltage, VDC - V Channel crosstalk, CT - dB CT - f Supply voltage, VCC - V Frequency, f - Hz THD - VCC Total harmonic distortion, THD - % Maximum output voltage, VO max - V VO max - VCC Supply voltage, VCC - V Supply voltage, VCC - V VG - f Voltage gain, VG - dB Total harmonic distortion, THD - % THD - PO Output power, PO - mW VG - VCC THD - PO Voltage gain, VG - dB Total harmonic distortion, THD - % Frequency, f - Hz Supply voltage, VCC - V Output power, PO - mW No.3534-6/9 Output noise voltage, VNO - V VNO - VCC Supply voltage, VCC - V Supply voltage rejection ratio, SVRR - dB LA4571MB SVRR - VCC Supply voltage, VCC - V Functional Decription (channl 1 only) Tape Head Preamplifier Tape head signal source are connected to the noninverting input of the op-amp, negative feedback preamplifier. When PRE MUTE is open, the preamplifier output is connected to SW OUT1, and when PRE MUTE is HIGH (VCC 0.2V at 60A input current), SW OUT1 is open. This can be used to switch, or mute, the preamplifier output. The internal circuit of the PRE MUTE pin is shown in the following figure. The output pins, PRE OUT1 and SW OUT1, can both drive a 10k load resistance. The preamplifier input pin, IN1, the negative feedback input pin, NF1, and the output pin, PRE OUT, are biased at 1.8V. Power Amplifier The power amplifier stage comprises an amplifier for each channel and a common amplifier. The power amplifier outputs are connected internally by 60 resistors to prevent oscillation, as shown in the following figure. When POWER MUTE is LOW (less than 0.3V at 2.5A input current), the power amplifier output signal is muted. The power amplifier mute release time is set by an external capacitor. No.3534-7/9 LA4571MB The internal circuit of the POWER MUTE pin is shown in the following figure. Reference Voltage The input to the voltage reference amplifier is a voltage divided level from the supply voltage ripple filter. The referecne voltage is given by 0.6 x VCC. The supply voltage ripple filter requires the connection of an external filter capacitor to RF REF. A large capacitance results in a high ripple rejection ratio. Noise filtering is achieved by the addition of a single capacitor to VREF. Since the reference voltage amplifier has a buffered output, this capacitor can be as low as 1F. The power amplifier input pin, POWER IN1, is biased at 1.8V, and the output pins at 1.2V Design Notes The preamplifier inputs should be connected to VREF through a 2.2k resistor if there is no tape head input signal source. The mute release time capacitor of the power amplifier should be between 1.0 and 4.7F. For VCC=3.0V and C=2.2F, the mute release time is 0.7s. The ripple rejection ratio setting capacitor should be between 2.2 and 33F. For 2.2F, the ripple rejection ratio is 35dB, and for 22F, it is 55dB. When the output amplifier turns OFF, the protection circuit shown in the following figure detects the falling supply voltage and then mutes the power amplifier to protect the device. Sample Application Circuit No.3534-8/9 LA4571MB 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 expor ted without obtaining the expor t 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 April, 2000. Specifications and information herein are subject to change without notice. PS No.3534-9/9