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MITSUMI
IC for Headphone Stereos (bass boost) LAG668
IC for Headphone Stereos (bass boost)
Monolithic IC LAG 668
Outline
This IC was developed to provide bass boost functions without deviating from the basic design concept of Mitsumi's LAG665, which is highly regarded for applications in headphone stereos for overseas markets in particular. Bass boost functions are widely adopted in models for overseas markets as well. However, because of stringent cost constraints, there has been a need for an IC which is simple and inexpensive. This IC can provide bass boost functions simply by adding three resistors and one capacitor (per channel). Moreover, it has the same pinout as the LAG665, so that by making selective use of set features, a product lineup can be developed without changes to the printed circuit board.
Features
1. Configuration: pre and power amps, motor control, E. VR, bass boost 2. Preamp off function convenient for use in models with radios 3. Independent motor control circuit 1. Motor noise is effectively suppressed 2. With motor on/off pin (motor can be stopped easily when radio is in use) 3. With fast forward pin 4. Bass boost frequency characteristic can be changed simply by changing the resistance multiplier. 5. Well-balanced E. VR circuit 1. L, R channels variable using a single VR 2. A-curve can be reproduced using B-curve VR 6. Few external components
Package
SOP-28B (LAG668F) SDIP-30A (LAG668D)
Absolute Maximum Ratings
Item Operating temperature Storage temperature Power supply current Power consumption Operating voltage Symbol TOPR TSTG VCC max. Pd Vop Ratings -20~+65 -40~+125 -0.3~+7.5 DIP : 750, SOP : 450 +2.0~+5.0 Units
C C
V mW V
MITSUMI
IC for Headphone Stereos (bass boost) LAG668
Electrical Characteristics
(Except where noted otherwise, Ta=25C) Min. Typ. Max. Units 18 25 mA 72 42 0.6 0.05 150 22 10 10 0.2 66 0 200 100 36 20 30 20 31 38 0 28 0.5 30 1.0 37 3.0 3.0 500 0.72 0.80 0.05 0.01 0.01 38 0.5 0.05 0.02 5.6 33 2.0 2.0 6.0 5.0 40 3 dB dB Vrms 0.5 % 300 Vrms k dB -50 dB k k 44 Vrms dB dB k k dB dB mW mW % dB mVrms dB mVrms
Item Symbol Measurement conditions Consumption current ICC VIN=0v, IM=0mA Preamp unit (Ta=25C) Open-circuit gain Gvo VO=-10dBm, RL=infinite Closed-circuit gain Gvc VO=-10dBm Maximum output voltage Vom THD=10% Total harmonic distortion ratio THD VOUT=400mVrms Output noise voltage Vno VIN=0, Rg=2.2k, BPF (30~20kHz) Input impedance ZIN VOUT=-10dBm Crosstalk between channels C.T Rg=2.2k, VOUT=-10dBm Output voltage with pre off Vooff VIN=100mVrms Output resistance with pre off Rooff Input resistance on pre off Rioff Attenuator unit (Ta=25C) Maximum input voltage Vi max. Maximum attenuation Va max. Vcont=min. Attenuation error Vaerr Vcont=max. Input impedance ZIN Control pin input resistance Zicot Power amp unit (Ta=25C) Voltage gain Gv POUT=5mW Voltage gain difference Gv Vcont=max. between channels Maximum output power I Pom1 THD=10%, RL=32 Maximum output power II Pom2 THD=10%, RL=16 Total harmonic distortion ratio THD POUT=5mW Crosstalk between channels C.T POUT=5mW Output noise voltage Vn Rg=2.2k, Vcont=max. Ripple rejection RR VCC=3V, 100Hz, 100mVp-p Noise of preamp + power amp + B.B. Vnto VIN=0, Rg=2.2k, Vcont=max. 1 Motor control unit (Ta=25C) Consumption current IMC Startup current IMS Reference voltage Vref Between RML-ADJ pins Reference voltage fluctuation I Vref1 VCC between 2.1 and 5.0 V Reference voltage fluctuation II Vref2 IM between 25 and 250 mA Reference voltage fluctuation III Vref3 Ta between -10 and 50C Current coefficient K Current coefficient fluctuation I K1 VCC between 2.1 and 5.0 V Current coefficient fluctuation II K2 IM between 25 and 250 mA Current coefficient fluctuation III K3 Ta between -10 and 50C Output voltage on forced on VCEsa IM=200mA, 14PIN=VCC Input resistance on forced on Rion Leakage current on forced off IML Input resistance on forced off Ricon Conditions unless stated otherwise Amp unit: VCC=3.0V, f=1kHz, RL=16, Pre OFF=OPEN Motor unit: VCC=3.0V, IM=100mA, Motor unit: (Mitsumi model) Note 1: Bass boost circuit constants are based on application circuit diagrams. Note 2: Motor pin voltage fluctuations
40 0.45 18 30
*
32
mA mA 0.87 V %/V %/mA %/C 43 %/V %/mA %/C 0.6 V k 200 A k
*
MITSUMI
IC for Headphone Stereos (bass boost) LAG668
Block Diagram
MITSUMI
IC for Headphone Stereos (bass boost) LAG668
Application Circuits
Bass Boost Power Amp Gain
Power amp gain (dB)
GV 40 GVH 35 30 25 GVL B*B Off 15 101 f1
GV : Power amp gain GVH : Bass boost power amp gain (high level) GVL : Bass boost power amp gain (low level, or boost off) f1, f2: Cutoff frequencies
3dB B*B ON 3dB 102 f2 103 104 105 106
Frequency (Hz)
GVH=GV+20Log GVL=GV+20Log f1= R3 ( R1+R3 ( (dB) ( R2//R3 R1 ( (dB) R2//R3+ R1 (Hz)
1 2 ((R1//R3) +R2)C (Hz)
1 f2= 2R2C
MITSUMI
IC for Headphone Stereos (bass boost) LAG668
Characteristics
(Bass boost)
Recommended constants
Power amp gain (dB)
40 35 30 25 20 15 101
R1=33k R2=4.7k GVH=37dB GVL=20dB
R3=180k f1=50Hz C=0.1F f2=340Hz No R4 or C2
102
103
104
105
106
Frequency (Hz)
Bass boost efficiency
Power amp gain (dB)
40 35 30 25 20 15 101 102 103 104 105 106
R1=12k R2=2.2k R3=180k C=0.1F GVH=37dB GVL=20dB f1=130Hz f2=720Hz No R4 or C2
Frequency (Hz)
Response for poor headphone and cassette head characteristics
Power amp gain (dB)
40 35 30 25 20 15 101 102 103 104 105 106
R1=33k R2=6.8k R3=180k C=0.1F GVH=37dB GVL=23dB f1=50Hz f2=230Hz No R4 or C2
Frequency (Hz)
Bass + treble boost
Power amp gain (dB)
40 35 30 25 20 15 101
102 103 104 105 106
R1=33k R2=4.7k GVH=37dB GVL=20dB
R3=180k f1=50Hz C=0.1F R4=20k C2=390pF f2=340Hz GVH=27dB
Frequency (Hz)

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