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Ordering number:ENN3968
Monolithic Linear IC
LA4589W
1.5V Stereo Headphone Preamplifier and Power Amplifier
Overview
The LA4589W is a 1.5V stereo headphone preamplifier and power amplifier IC that provides all the functions of a complete playback system in a single chip, making it ideal for battery-powered, portable cassette players. The LA4589W incorporates a metal/normal-tape equalization preamplifier, a power amplifier dual power supply ripple filters, a reference voltage amplifier that enables small-value (under 1 F) virtual-earth capacitors to be used, and a system controller. The LA4589W features single-pin control bass boost and forward/reverse playback, an automatic music search (AMS) function, inputs for an auto-reverse tape mechanism, a power amplifier mute function, a power switch, and selectable single or dual ripple filter operation. The LA4589W operates from a 0.95 to 2.2V supply and is available in 48-pin SQFPs.
Package Dimensions
unit:mm 3163A-SQFP48
[LA4589W]
9.0 7.0 0.75
36 37
0.5
0.18
25
0.75
0.15
9.0 7.0
0.5
0.75
24
48
13 1 12
0.5
0.1
0.5
1.7max
0.75
SANYO : SQFP48
Features
* Single-pin control bass boost. * Automatic music search (AMS). * Preamplifier inputs for auto-reverse tape mechanism. * Single-pin control forward/reverse playback selection. * Two, on-chip, ripple filters. * Selectable, single or dual ripple filter operation. * Metal- and normal-tape modes. * Power amplifier mute function. * On-chip reference voltage amplifier. * No power amplifier output capacitors required. * 73dB (typ) preamplifier open-loop voltage gain. * 21mW (typ) output power with bass boost. * Built-in noise reduction capacitors. * 0.95 to 2.2V supply. * 48-pin SQFP.
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
30600TN (KT)/5062TS No.3968-1/9
LA4589W Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Conditions Ratings 3.0 320 -10 to +60 -40 to +125 Unit V mW
C C
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating voltage Symbol VCC VCC op Conditions Ratings 1.5 0.95 to 2.2 Unit V V
Operating Characteristics at Ta = 25C, VCC=1.2V, f=1kHz, 0dBm=0.775V, RL=10k (preamplifier), RL =16 (power amplifier)
Parameter [Preamplifier and power amplifier] Quiescent current Closed-loop voltage gain [Preamplifier] Open-loop voltage gain Closed-loop voltage gain Maximum output voltage Total harmonic distortion Equivalent input noise voltage Crosstalk rejection between channel 1 and channel 2 Crosstalk rejectin between forward and reverse tracks Ripple rejection ratio [Power amplifier with bass boost] VG3 Closed-loop voltage gain VG4 VG5 VG6 Output power Total harmonic distortion Crosstalk rejection between left and right channels Output noise voltage Ripple rejection ratio Input impedance Voltage gain differential [Ripple filter] Output voltage Ripple rejection ratio [Automatic music search (AMS)] AMS output voltage VOAMS VPREOUT1=6mV 470 570 670 mV VRF Rr3 IRF=25mA, VCC=1.0V fr=100Hz, Vr=-30dBm, VCC=1.0V, IRF=25mA, output transistors with hFE 6 (2SB1295) 0.89 33 0.93 39 V dB PO1 PO2 THD2 CT3 VNO Rr2 RI VG3 VO=-20dBm VO=-20dBm, LBSW is ON. VO=-20dBm, f=10kHz, LBSW is ON. VO=-20dBm, f=100Hz, LBSW is ON. THD=10% THD=10%, f=100Hz, LBSW is ON. PO=1mW VO=-20dBm, RV=0 RV=0, 20Hz to 20kHz bandpass filter RV=0, Vr=-30dBm, fr=100Hz, 100Hz tuned filter 50 8 38 20.5 20.5 24.5 30 5 13 23.0 23.0 27.5 34 9 21 0.5 43 35 74 10 0 12 1.5 48 1.5 25.5 25.5 30.5 38 dB dB dB dB mW mW % dB V dB k dB VGO VG1 VG2 VO max THD1 VNI CT1 Rg=2.2k, VO=-20dBm, 1kHz tuned filter CT2 Rr1 Rg=2.2k, VO=-30dBm, fr=100Hz, 100Hz tuned filter 65 45 78 52 dB dB VO=-20dBm VO=-20dBm VO=-20dBm, f=10kHz, METALSW is ON. THD=1% VG=35.5dB/NAB, VO=100mV Rg=2.2k, 20Hz to 20kHz bandpass filter 45 60 34.0 25.5 100 73 35.5 28.0 210 0.1 1.3 56 0.5 3.0 37.0 30.5 dB dB dB mV % V dB ICCO1 ICCO2 VGT Rg=2.2k, RV=0 PSW is OFF. VO=-20dBm, RV=10k 54 8 15 0.1 57 24 5.0 60 mA A dB Symbol Conditions Ratings min typ max Unit
No.3968-2/9
LA4589W
Block Diagram
Test Circuit
No.3968-3/9
LA4589W
Sample Application Circuit
Note : Use the 2SB1295 of hFE rank 6 or higher. Pin Description
Number Name Equivalent circuit Description
1
RFOUT1 Ripple filter outputs. Nominal voltage is 1.13V
45
RFOUT2
2
POUT1
Power amplifier output 1. Nominal voltage is 0.6V.
7
POUTC
Power amplifier common output. Nominal voltage is 0.6V.
13
POUT2
Power amplifer output 2. Nominal voltage is 0.6V.
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No.3968-4/9
LA4589W
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Number Name Equivalent circuit Description Power amplifier output 1 negative feedback reference voltage. Nominal voltage is 0.75V.
3
PNFREF1
9
PNFREFC
Power amplifier common output negative feedback reference voltage. Nominal voltage is 0.75V.
12
PNFREF2
Power amplifer output 2 negative feedback reference voltage. Nominal voltage is 0.75V.
4
PNF1
Power amplifier output 1 negative feedback network connection. Nominal voltage is 0.75V. Power amplifier common output negative feedback network connection. Nominal voltage is 0.75V. Power amplifier output 2 negative feedback network connection. Nominal voltage is 0.75V.
8
PNFC
11
PNF2
5
PHP1 Power amplifier highpass filter outputs for bass boost. Nominal voltage is 0.75V.
10
PHP2
6
PGND
Power amplifier ground.
14
LP2
Bass boost amplifier lowpass filter capacitor connection 2. Nominal voltage is 0.75V.
15
LBNF
Bass boost amplifier negative feedback capacitor connection. Nominal voltage is 0.75V.
16
PIN2
Power amplifier inputs. Nominal voltage is 0.75V.
18
PIN1
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No.3968-5/9
LA4589W
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Number Name Equivalent circuit Description
17
LP1
Bass boost amplifier lowpass filter capacitor connection 1. Nominal voltage is 0.75V.
19
NFC2 Negative feedback capacitor connections. Nominal voltage is 0.75V.
20
NFC1
21
PRENF1
Preamplifier channel 1 negative feedback network connection. Nominal voltage is 0.75V.
28
PRENF2
Preamplifier channel 2 negative feedback network connection. Nominal voltage is 0.75V.
22
PREOUT1
Preamplifier outputs. Nominal voltage is 0.45V.
27
PREOUT2
23
METAL1
Preamplifier channel 1 metal-tape mode connection. Nominal voltage is 0V.
26
METAL2
Preamplifier channel 2 metal-tape mode connection. Nominal voltage is 0V.
24
AMSIN1
Automatic music search inputs. Nominal voltage is 0.75V.
25
AMSIN2
29
PRERI1
Preamplifier reverse playback inputs. Nominal voltage is 0.75V.
30
PRERI2
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LA4589W
Continued from preceding page.
Number Name Equivalent circuit Description
31
PREFI2 Preamplifier forward playback inputs. Nominal voltage is 0.75V.
32
PREFI1
33
VREF
Reference voltage amplifier output. Nominal voltage is 0.75V.
34
REF
35
PREGND
Preamplifier ground
36
AMSOUT
Automatic music search output.
37
PMUTESW
Power amplifier mute control input.
41
LBSW
Bass boost control input.
38
PSW
Power switch control input.
Continued on next page.
No.3968-7/9
LA4589W
Continued from preceding page.
Number 39 Name F/RSW Equivalent circuit Description Forward/reverse playback control input.
40
METALSW
Metal-tape mode control input.
43
RF1SW
Ripple filter output 1 control input.
42
NC
No connection.
44
RFREF
Ripple filter capacitor connection. Nominal voltage is 1.13V.
46
RFBASE2
Ripple filter external pnp-transistor 2 base connection. Nominal voltage is 0.5V.
48
RFBASE1
Ripple filter external pnp-transistor 1 base connection. Nominal voltage is 0.5V.
47
VCC
Supply voltage.
Note Nominal voltages are measured when VCC=1.2V.
Functional Description
Preamplifier The preamplifier incorporates equalization networks for normal- and metal-tape playback modes, and tapedirection switches for an auto-reverse cassette mechanism. When METALSW is floating, metal-tape mode is selected. METAL1 and METAL2 are grounded internally through 3.9k resistors, adjusting the negative feedback network to provide metal-tape playback equalization. When F/RSW is floating, forward playback mode is selected, and PREFI1 and PREFI2 are connected to the preamplifier imputs. When F/RSW is grounded, reverse playback mode is selected, and PRERI1 and PRERI2 are connected to the preamplifier inputs. The automatic music search (AMS) circuit generates a signal that controls the cassette mechanism fast-forward and reverse functions in response to pauses between music tracks. The signal on AMSOUT is a pulse wave whose amplitude varies with the input signal levels on AMSIN1 and AMSIN2. Power Amplifier The power amplifier incorporates an additional amplifier to provide bass boost and mute functions. When LBSW is floating, the bass boost function is selected. PHP1 and PHP2 are connected to VREF through 1k internal resistors, adjusting the negative feedback network to provide highpass filtering. When PMUTESW is grounded, the power amplifier mute function is selected. Ripple Filter The ripple filters can be configured for either single or dual-filter operation. When RF1SW is grounded, the ripple filters are configured for dual-filter operation and RFOUT1 is active.
No.3968-8/9
LA4589W
External Components Required
Component C1 C2, C10 C3, C9 C4, C8 C5, C7 C6 C11, C12 C13, C15 C14, C17 C16 C18, C23, C26 C19, C22, C25 C20, C24 C21 C27, C29 C28 C30 C31, C32 R1, R10 R2, R9 R3, R8 R4, R7 R5, R6 R11, R12, R13 R14, R15 Recommended value 1.0 to 10F - 0.47 to 3.3F - - 0.1 to 22F 3.3 to 10F 1.0 to 3.3F - 1.0 to 4.7F 0.1 to 1.0F 3.3 to 10.0F - 100 to 2200pF 4.7 to 10F 22 to 220F 2.2 to 10.0F 0.047 to 0.22F - - - 10k variable - - 100 to 430k Description Reference voltage amplifier decoupling capacitor. Decreasing the capacitance reduces the supply voltage ripple rejection ratio. Preamplifier equalization RC network capacitors. Preamplifer output capacitors. AMS input highpass filter RC network capacitors. Metal-tape equalization RC network capacitors. Reference voltage decoupling capacitor. Reduces high-band noise. NFC decoupling capacitors. Decreasing the capacitance reduces the preamplifier low-band gain. Power amplifier input capacitors. Low-boost lowpass filter and amplifier gain adjust capacitors. Bass boost amplifier negative feedback capacitor. Decreasing the capacitance reduces the low-band gain. Power amplifier output oscillation-damping RC network capacitors. Power amplifier negative feedback capacitors. Decreasing the capacitance reduces the low-band gain. Power amplifier highpass filter high-band gain adjust capacitors (bass-boost only). Smoothing capacitor. Ripple filter output decoupling capacitors. Power supply capacitor. Ripple filter capacitor. Switching noise filter capacitors. Preamplifier gain adjust resistors. Preamplifier equalization RC network resistors. Metal-tape preamplifier equalization RC network resistors. Volume control resistors. Automatic music search (AMS)highpass filter and gain adjust resistors. Power amplifier output oscillation-damping RC network resistors. Switching noise filter resistors.
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 March, 2000. Specifications and information herein are subject to change without notice.
PS No.3968-9/9

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