Mitsumi LAG668D Ic for headphone stereos (bass boost) Datasheet

IC for Headphone Stereos (bass boost) LAG668
MITSUMI
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
Symbol
Ratings
Units
Operating temperature
TOPR
-20~+65
°C
Storage temperature
TSTG
-40~+125
°C
Power supply current
VCC max.
-0.3~+7.5
V
Power consumption
Pd
DIP : 750, SOP : 450
mW
Operating voltage
Vop
+2.0~+5.0
V
MITSUMI
Electrical Characteristics
IC for Headphone Stereos (bass boost) LAG668
(Except where noted otherwise, Ta=25°C)
Item
Symbol
Measurement conditions
Consumption current
ICC
VIN=0v, IM=0mA
Preamp unit (Ta=25°C)
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=25°C)
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=25°C)
Voltage gain
Gv
POUT=5mW
Voltage gain difference
Gv
Vcont=max.
between channels
Maximum output power I
Pom1
THD=10%, RL=32Ω
Maximum output power II
Pom2
THD=10%, RL=16Ω
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=25°C)
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 50°C
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 50°C
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=16Ω, 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
Min.
40
0.45
18
30
72
42
0.6
0.05
150
22
10
10
dB
dB
Vrms
0.5
%
300 µVrms
kΩ
dB
-50
dB
kΩ
kΩ
44
0.2
66
Vrms
dB
dB
kΩ
kΩ
0
200
100
36
20
30
20
31
*
*
Typ. Max. Units
18
25
mA
500
0.72
32
38
40
dB
0
3
dB
28
0.5
30
1.0
37
3.0
2.0
3.0
5.0
0.80
0.05
0.01
0.01
38
0.5
0.05
0.02
5.6
33
2.0
6.0
mW
mW
%
dB
mVrms
dB
mVrms
mA
mA
0.87
V
%/V
%/mA
%/°C
43
%/V
%/mA
%/°C
0.6
V
kΩ
200
µA
kΩ
MITSUMI
Block Diagram
IC for Headphone Stereos (bass boost) LAG668
IC for Headphone Stereos (bass boost) LAG668
MITSUMI
Application Circuits
Power amp gain (dB)
Bass Boost Power Amp Gain
GV 40
GVH
35
3dB
30
B•B ON
25
3dB
GVL
B•B Off
15
101
102
f1
103
104
105
106
f2
Frequency (Hz)
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
GVH=GV+20Log
GVL=GV+20Log
f1=
R3
( R1+R3
( (dB)
R1
(dB)
( R2//R3
R2//R3+ R1 (
1
2π ((R1//R3) +R2)C
1
f2=
2πR2C
(Hz)
(Hz)
IC for Headphone Stereos (bass boost) LAG668
MITSUMI
Characteristics
(Bass boost)
Power amp gain (dB)
Recommended constants
40
R1=33kΩ
GVH=37dB
35
R2=4.7kΩ
GVL=20dB
30
R3=180kΩ f1=50Hz
25
C=0.1µF
20
15
101
f2=340Hz
No R4 or C2
102
103
104
105
106
Frequency (Hz)
Power amp gain (dB)
Bass boost efficiency
40
R1=12kΩ
GVH=37dB
35
R2=2.2kΩ
GVL=20dB
30
R3=180kΩ
f1=130Hz
25
C=0.1µF
f2=720Hz
20
15
101
No R4 or C2
102
103
104
105
106
Frequency (Hz)
Power amp gain (dB)
Response for poor headphone and cassette head characteristics
40
R1=33kΩ
GVH=37dB
35
R2=6.8kΩ
GVL=23dB
30
R3=180kΩ
f1=50Hz
25
C=0.1µF
f2=230Hz
20
15
101
No R4 or C2
102
103
104
105
106
Frequency (Hz)
Power amp gain (dB)
Bass + treble boost
40
R1=33kΩ
GVH=37dB
35
R2=4.7kΩ
GVL=20dB
30
R3=180kΩ f1=50Hz
25
C=0.1µF
f2=340Hz
R4=20kΩ
GVH=27dB
20
15
101
C2=390pF
102
103
104
Frequency (Hz)
105
106
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