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Ordering number:ENN3534
Monolithic Linear IC
LA4571MB
Low-voltage Headphone Amplifier for Stereo Audio
Overview
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.
Package Dimensions
unit:mm 3036B-MFP20
[LA4571MB]
20 11
6.35 0.15 0.625
1 12.6
10 1.8 max
0.35
1.27
0.59
0.1
1.5
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 Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Conditions Ratings 4.5 400 -20 to +75 -40 to +125 Unit V mW
C C
Recommended Operating Conditions at Ta = 25C
Parameter Supply voltage Supply voltage range Symbol VCC VCC op Conditions Ratings 3.0 1.8 to 3.6 Unit V 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
5.4
SANYO : MFP20
7.6
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 Quiescent supply current Total voltage gain Symbol ICCO VGT Rg=2.2k, VI=0V VO=-5dBm Conditions Ratings min 65 typ 17 68 max 27 71 Unit mA dB
Preamplifier at Ta = 25C, VCC=3.0V, f=1kHz, RL (pre)=10k, RL (power)=16, 0dBm at 0.775V unless otherwise noted
Parameter Open-loop voltage gain Closed-loop voltage gain Maximum output voltage Total harmonic distortion Input conversion noise voltage Channel crosstalk Ripple rejection Symbol VGO VG1 VO max THD1 VNI CT1 Rr1 VO=-5dBm VO=-5dBm THD=1%, VCC=1.8V VO=0.2V, VG=40dB (NAB standard) Rg=2.2k, bandwidth=20Hz to 20kHz Rg=2.2k, 1kHz tune Rg=2.2k, VCC=1.8V, Vr=-20dBm, f=100Hz 60 40 0.1 Conditions Ratings min 70 typ 80 40 0.2 0.05 1.3 80 50 0.5 2.0 max Unit dB dB V % V dB dB
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 Closed-loop voltage gain Total harmonic distortion Channel crosstalk Output noise voltage Ripple rejection Input resistance Output DC offset voltage Symbol PO VG2 THD2 CTT VNO Rr2 Ri VODC off THD=10% VO=-5dBm PO=1mW VO=-5dBm, RV=0 Rg=0, BPF=20Hz to 20kHz Rg=0, Vr=-20dB, f=100Hz, VCC=1.8V 45 22 -90 30 Conditions Ratings min 23 25 typ 32 28 0.4 40 24 60 30 38 +90 40 31 1.0 max Unit mW dB % dB V dB k mV
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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name PRE GND IN1 NF1 PRE OUT1 SW OUT1 POWER IN1 PRE MUTE RF REF VCC POWER GND COMMON OUT1 OUT2 POWER MUTE POWER IN2 SW OUT2 PRE OUT2 NF2 IN2 VREF Preamplifier ground Channel 1 preamplifier input Channel 1 preamplifier negative feedback input Channel 1 preamplifier output Channel 1 preamplifier mute-control switched output RIN 500k Channel 1 power amplifier input. RIN30k Preamplifier mute control Ripple-filter capacitor connection Supply voltage Power amplifier ground Common amplifier output Channel 1 power amplifier output Channel 2 power amplifier output Power amplifier mute control Channel 2 power amplifier input. RIN30k Channel 2 preamplifier mute-control switched output. RIN 500k Channel 2 preamplifier output Channel 2 preamplifier negative feedback input Channel 2 preamplifier input Referecne-voltage amplifier output. Imax=500A Description
No.3534-3/9
LA4571MB
Test Circuit
Allowable power dissipation, Pd max - mW
Pd max - Ta
Quiescent supply current, ICCO - mA
ICCO - VCC
Ambient temperature, Ta - C
Supply voltage, VCC - V
VGO, VG - f
Total harmonic distortion, THD - %
THD - VO
Voltage gain, VG - dB
Frequency, f - Hz
Output voltage, VO - V
No.3534-4/9
LA4571MB
VGO - VCC
Maximum output voltage, VO max - V Open-loop voltage gain, VGO - dB
VO max - VCC
Supply voltage, VCC - V
Supply voltage, VCC - V
CT - f
Output noise voltage, VNO - V Channel crosstalk, CT - dB
VNO - VCC
Frequency, f - Hz
Supply voltage, VCC - V
Supply voltage rejection ratio, SVRR - dB
VO - f
SVRR - VCC
Output level, VO - dBm
Frequency, f - Hz
Supply voltage, VO - V
Vref - IO
Reference voltage, Vref - V
Output current, IO - mA No.3534-5/9
LA4571MB
VDC - VCC
Channel crosstalk, CT - dB
CT - f
DC voltage, VDC - V
Supply voltage, VCC - V
Frequency, f - Hz
VO max - VCC
Maximum output voltage, VO max - V Total harmonic distortion, THD - %
THD - VCC
Supply voltage, VCC - V
Supply voltage, VCC - V
VG - f
Total harmonic distortion, THD - %
THD - PO
Voltage gain, VG - dB
Frequency, f - Hz
Output power, PO - mW
VG - VCC
Total harmonic distortion, THD - %
THD - PO
Voltage gain, VG - dB
Supply voltage, VCC - V
Output power, PO - mW
No.3534-6/9
LA4571MB
Supply voltage rejection ratio, SVRR - dB
VNO - VCC
Output noise voltage, VNO - V
SVRR - VCC
Supply voltage, VCC - V
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

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